* [PATCH v2 01/15] efi: delete stray ARM ifdef
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
@ 2014-03-13 22:46 ` Leif Lindholm
2014-03-13 22:46 ` [PATCH v2 02/15] efi: x86: Improve cmdline conversion Leif Lindholm
` (13 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:46 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: roy.franz, Leif Lindholm, msalter
An #ifdef CONFIG_ARM clause in efi-stub-helper.c got included with some
of the generic stub rework by Roy Franz. Drop it here to make subsequent
patches less confusing.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
drivers/firmware/efi/efi-stub-helper.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index b6bffbf..6811af7 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -608,18 +608,8 @@ static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
}
options_size++; /* NUL termination */
-#ifdef CONFIG_ARM
- /*
- * For ARM, allocate at a high address to avoid reserved
- * regions at low addresses that we don't know the specfics of
- * at the time we are processing the command line.
- */
- status = efi_high_alloc(sys_table_arg, options_size, 0,
- &cmdline_addr, 0xfffff000);
-#else
- status = efi_low_alloc(sys_table_arg, options_size, 0,
- &cmdline_addr);
-#endif
+
+ status = efi_low_alloc(sys_table_arg, options_size, 0, &cmdline_addr);
if (status != EFI_SUCCESS)
return NULL;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 02/15] efi: x86: Improve cmdline conversion
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
2014-03-13 22:46 ` [PATCH v2 01/15] efi: delete stray ARM ifdef Leif Lindholm
@ 2014-03-13 22:46 ` Leif Lindholm
2014-03-13 22:46 ` [PATCH v2 03/15] efi: create memory map iteration helper Leif Lindholm
` (12 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:46 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: roy.franz, H. Peter Anvin, Leif Lindholm, msalter
From: "H. Peter Anvin" <hpa@zytor.com>
Improve the conversion of the UTF-16 EFI command line
to UTF-8 for passing to the kernel.
Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
arch/x86/boot/compressed/eboot.c | 3 +-
drivers/firmware/efi/efi-stub-helper.c | 91 ++++++++++++++++++++++++--------
2 files changed, 70 insertions(+), 24 deletions(-)
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index a7677ba..feca05f 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -488,8 +488,7 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
hdr->type_of_loader = 0x21;
/* Convert unicode cmdline to ascii */
- cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, image,
- &options_size);
+ cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
if (!cmdline_ptr)
goto fail;
hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 6811af7..661f425 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -575,52 +575,99 @@ static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
}
/*
- * Convert the unicode UEFI command line to ASCII to pass to kernel.
+ * Get the number of UTF-8 bytes corresponding to an UTF-16 character.
+ * This overestimates for surrogates, but that is okay.
+ */
+static int efi_utf8_bytes(u16 c)
+{
+ return 1 + (c >= 0x80) + (c >= 0x800);
+}
+
+/*
+ * Convert an UTF-16 string, not necessarily null terminated, to UTF-8.
+ */
+static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n)
+{
+ unsigned int c;
+
+ while (n--) {
+ c = *src++;
+ if (n && c >= 0xd800 && c <= 0xdbff &&
+ *src >= 0xdc00 && *src <= 0xdfff) {
+ c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff);
+ src++;
+ n--;
+ }
+ if (c >= 0xd800 && c <= 0xdfff)
+ c = 0xfffd; /* Unmatched surrogate */
+ if (c < 0x80) {
+ *dst++ = c;
+ continue;
+ }
+ if (c < 0x800) {
+ *dst++ = 0xc0 + (c >> 6);
+ goto t1;
+ }
+ if (c < 0x10000) {
+ *dst++ = 0xe0 + (c >> 12);
+ goto t2;
+ }
+ *dst++ = 0xf0 + (c >> 18);
+ *dst++ = 0x80 + ((c >> 12) & 0x3f);
+t2:
+ *dst++ = 0x80 + ((c >> 6) & 0x3f);
+t1:
+ *dst++ = 0x80 + (c & 0x3f);
+ }
+
+ return dst;
+}
+
+/*
+ * Do proper conversion from UTF-16 to UTF-8
* Size of memory allocated return in *cmd_line_len.
* Returns NULL on error.
*/
-static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
- efi_loaded_image_t *image,
- int *cmd_line_len)
+static char *efi_convert_cmdline(efi_system_table_t *sys_table_arg,
+ efi_loaded_image_t *image,
+ int *cmd_line_len)
{
- u16 *s2;
+ const u16 *s2;
u8 *s1 = NULL;
unsigned long cmdline_addr = 0;
- int load_options_size = image->load_options_size / 2; /* ASCII */
- void *options = image->load_options;
- int options_size = 0;
+ int load_options_chars = image->load_options_size / 2; /* UTF-16 */
+ const u16 *options = image->load_options;
+ int options_bytes = 0; /* UTF-8 bytes */
+ int options_chars = 0; /* UTF-16 chars */
efi_status_t status;
- int i;
u16 zero = 0;
if (options) {
s2 = options;
- while (*s2 && *s2 != '\n' && options_size < load_options_size) {
- s2++;
- options_size++;
+ while (options_chars < load_options_chars
+ && *s2 && *s2 != '\n') {
+ options_bytes += efi_utf8_bytes(*s2++);
+ options_chars++;
}
}
- if (options_size == 0) {
- /* No command line options, so return empty string*/
- options_size = 1;
+ if (!options_chars) {
+ /* No command line options, so return empty string */
options = &zero;
}
- options_size++; /* NUL termination */
+ options_bytes++; /* NUL termination */
- status = efi_low_alloc(sys_table_arg, options_size, 0, &cmdline_addr);
+ status = efi_low_alloc(sys_table_arg, options_bytes, 0, &cmdline_addr);
if (status != EFI_SUCCESS)
return NULL;
s1 = (u8 *)cmdline_addr;
- s2 = (u16 *)options;
-
- for (i = 0; i < options_size - 1; i++)
- *s1++ = *s2++;
+ s2 = (const u16 *)options;
+ s1 = efi_utf16_to_utf8(s1, s2, options_chars);
*s1 = '\0';
- *cmd_line_len = options_size;
+ *cmd_line_len = options_bytes;
return (char *)cmdline_addr;
}
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 03/15] efi: create memory map iteration helper
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
2014-03-13 22:46 ` [PATCH v2 01/15] efi: delete stray ARM ifdef Leif Lindholm
2014-03-13 22:46 ` [PATCH v2 02/15] efi: x86: Improve cmdline conversion Leif Lindholm
@ 2014-03-13 22:46 ` Leif Lindholm
[not found] ` <1394750828-16351-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
` (11 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:46 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: roy.franz, Leif Lindholm, msalter
From: Mark Salter <msalter@redhat.com>
There are a lot of places in the kernel which iterate through an
EFI memory map. Most of these places use essentially the same
for-loop code. This patch adds a for_each_efi_memory_desc()
helper to clean up all of the existing duplicate code and avoid
more in the future.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
include/linux/efi.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 64d532c..a3276da 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -622,6 +622,12 @@ extern int efi_set_rtc_mmss(const struct timespec *now);
extern void efi_reserve_boot_services(void);
extern struct efi_memory_map memmap;
+/* Iterate through an efi_memory_map */
+#define for_each_efi_memory_desc(m, md) \
+ for ((md) = (m)->map; \
+ (md) <= (efi_memory_desc_t *)((m)->map_end - (m)->desc_size); \
+ (md) = (void *)(md) + (m)->desc_size)
+
/**
* efi_range_is_wc - check the WC bit on an address range
* @start: starting kvirt address
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread[parent not found: <1394750828-16351-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]
* [PATCH v2 04/15] lib: add fdt_empty_tree.c
[not found] ` <1394750828-16351-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
@ 2014-03-13 22:46 ` Leif Lindholm
2014-03-13 22:47 ` [PATCH v2 08/15] efi: Add get_dram_base() helper function Leif Lindholm
1 sibling, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:46 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-efi-u79uwXL29TY76Z2rM5mHXA, catalin.marinas-5wv7dgnIgG8,
matt.fleming-ral2JQCrhuEAvxtiuMwx3w
Cc: msalter-H+wXaHxf7aLQT0dZR+AlfA, roy.franz-QSEj5FYQhm4dnm+yROfE0A,
Leif Lindholm
From: Mark Salter <msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
CONFIG_LIBFDT support does not include fdt_empty_tree.c which is
needed by arm64 EFI stub. Add it to libfdt_files.
Signed-off-by: Mark Salter <msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Leif Lindholm <leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
lib/Makefile | 3 ++-
lib/fdt_empty_tree.c | 2 ++
2 files changed, 4 insertions(+), 1 deletion(-)
create mode 100644 lib/fdt_empty_tree.c
diff --git a/lib/Makefile b/lib/Makefile
index 48140e3..befe555 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -147,7 +147,8 @@ obj-$(CONFIG_GENERIC_NET_UTILS) += net_utils.o
obj-$(CONFIG_STMP_DEVICE) += stmp_device.o
-libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o
+libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o \
+ fdt_empty_tree.o
$(foreach file, $(libfdt_files), \
$(eval CFLAGS_$(file) = -I$(src)/../scripts/dtc/libfdt))
lib-$(CONFIG_LIBFDT) += $(libfdt_files)
diff --git a/lib/fdt_empty_tree.c b/lib/fdt_empty_tree.c
new file mode 100644
index 0000000..5d30c58
--- /dev/null
+++ b/lib/fdt_empty_tree.c
@@ -0,0 +1,2 @@
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/fdt_empty_tree.c"
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 08/15] efi: Add get_dram_base() helper function
[not found] ` <1394750828-16351-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2014-03-13 22:46 ` [PATCH v2 04/15] lib: add fdt_empty_tree.c Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
1 sibling, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-efi-u79uwXL29TY76Z2rM5mHXA, catalin.marinas-5wv7dgnIgG8,
matt.fleming-ral2JQCrhuEAvxtiuMwx3w
Cc: msalter-H+wXaHxf7aLQT0dZR+AlfA, roy.franz-QSEj5FYQhm4dnm+yROfE0A,
Leif Lindholm
From: Roy Franz <roy.franz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Add the get_dram_base() function, shared by arm/arm64.
Signed-off-by: Roy Franz <roy.franz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Signed-off-by: Leif Lindholm <leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
drivers/firmware/efi/efi-stub-helper.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 4c8ab86..4a9986b 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -11,6 +11,10 @@
*/
#define EFI_READ_CHUNK_SIZE (1024 * 1024)
+/* error code which can't be mistaken for valid address */
+#define EFI_ERROR (~0UL)
+
+
struct file_info {
efi_file_handle_t *handle;
u64 size;
@@ -92,6 +96,32 @@ fail:
return status;
}
+
+static unsigned long __init get_dram_base(efi_system_table_t *sys_table)
+{
+ efi_status_t status;
+ unsigned long map_size;
+ unsigned long membase = EFI_ERROR;
+ struct efi_memory_map map;
+ efi_memory_desc_t *md;
+
+ status = efi_get_memory_map(sys_table, (efi_memory_desc_t **)&map.map,
+ &map_size, &map.desc_size, NULL, NULL);
+ if (status != EFI_SUCCESS)
+ return membase;
+
+ map.map_end = map.map + map_size;
+
+ for_each_efi_memory_desc(&map, md)
+ if (md->attribute & EFI_MEMORY_WB)
+ if (membase > md->phys_addr)
+ membase = md->phys_addr;
+
+ efi_call_phys1(sys_table->boottime->free_pool, map.map);
+
+ return membase;
+}
+
/*
* Allocate at the highest possible address that is not above 'max'.
*/
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread
* [PATCH v2 05/15] efi: add helper function to get UEFI params from FDT
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (3 preceding siblings ...)
[not found] ` <1394750828-16351-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
@ 2014-03-13 22:46 ` Leif Lindholm
2014-03-13 22:46 ` [PATCH v2 06/15] doc: efi-stub.txt updates for ARM Leif Lindholm
` (9 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:46 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: roy.franz, Leif Lindholm, msalter
From: Mark Salter <msalter@redhat.com>
ARM and ARM64 architectures use the device tree to pass UEFI parameters
from stub to kernel. These parameters are things known to the stub but
not discoverable by the kernel after the stub calls ExitBootSerives().
There is a helper function in:
drivers/firmware/efi/fdt.c
which the stub uses to add the UEFI parameters to the device tree.
This patch adds a complimentary helper function which UEFI runtime
support may use to retrieve the parameters from the device tree.
If an architecture wants to use this helper, it should select
CONFIG_UEFI_PARAMS_FROM_FDT.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
drivers/firmware/efi/Kconfig | 7 ++++
drivers/firmware/efi/efi.c | 79 ++++++++++++++++++++++++++++++++++++++++++
include/linux/efi.h | 9 +++++
3 files changed, 95 insertions(+)
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index 1e75f48..d3fe28d 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -47,6 +47,13 @@ config EFI_RUNTIME_MAP
See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
+config UEFI_PARAMS_FROM_FDT
+ bool
+ help
+ Select this config option from the architecture Kconfig if
+ the EFI runtime support gets system table address, memory
+ map address, and other parameters from the device tree.
+
endmenu
config UEFI_CPER
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index b25b36b..7f6e977 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -20,6 +20,8 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/efi.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
#include <linux/io.h>
struct efi __read_mostly efi = {
@@ -318,3 +320,80 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables)
return 0;
}
+
+#ifdef CONFIG_UEFI_PARAMS_FROM_FDT
+
+#define UEFI_PARAM(name, prop, field) \
+ { \
+ { name }, \
+ { prop }, \
+ offsetof(struct efi_fdt_params, field), \
+ FIELD_SIZEOF(struct efi_fdt_params, field) \
+ }
+
+static __initdata struct {
+ const char name[32];
+ const char propname[32];
+ int offset;
+ int size;
+} dt_params[] = {
+ UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
+ UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
+ UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
+ UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
+ UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
+};
+
+struct param_info {
+ int verbose;
+ void *params;
+};
+
+static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
+ int depth, void *data)
+{
+ struct param_info *info = data;
+ void *prop, *dest;
+ unsigned long len;
+ u64 val;
+ int i;
+
+ if (depth != 1 ||
+ (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
+ return 0;
+
+ pr_info("Getting parameters from FDT:\n");
+
+ for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
+ prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
+ if (!prop) {
+ pr_err("Can't find %s in device tree!\n",
+ dt_params[i].name);
+ return 0;
+ }
+ dest = info->params + dt_params[i].offset;
+
+ val = of_read_number(prop, len / sizeof(u32));
+
+ if (dt_params[i].size == sizeof(u32))
+ *(u32 *)dest = val;
+ else
+ *(u64 *)dest = val;
+
+ if (info->verbose)
+ pr_info(" %s: 0x%0*llx\n", dt_params[i].name,
+ dt_params[i].size * 2, val);
+ }
+ return 1;
+}
+
+int __init efi_get_fdt_params(struct efi_fdt_params *params, int verbose)
+{
+ struct param_info info;
+
+ info.verbose = verbose;
+ info.params = params;
+
+ return of_scan_flat_dt(fdt_find_uefi_params, &info);
+}
+#endif /* CONFIG_UEFI_PARAMS_FROM_FDT */
diff --git a/include/linux/efi.h b/include/linux/efi.h
index a3276da..d450673 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -483,6 +483,14 @@ struct efi_memory_map {
unsigned long desc_size;
};
+struct efi_fdt_params {
+ u64 system_table;
+ u64 mmap;
+ u32 mmap_size;
+ u32 desc_size;
+ u32 desc_ver;
+};
+
typedef struct {
u32 revision;
void *parent_handle;
@@ -620,6 +628,7 @@ extern void efi_initialize_iomem_resources(struct resource *code_resource,
extern void efi_get_time(struct timespec *now);
extern int efi_set_rtc_mmss(const struct timespec *now);
extern void efi_reserve_boot_services(void);
+extern int efi_get_fdt_params(struct efi_fdt_params *params, int verbose);
extern struct efi_memory_map memmap;
/* Iterate through an efi_memory_map */
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 06/15] doc: efi-stub.txt updates for ARM
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (4 preceding siblings ...)
2014-03-13 22:46 ` [PATCH v2 05/15] efi: add helper function to get UEFI params from FDT Leif Lindholm
@ 2014-03-13 22:46 ` Leif Lindholm
2014-03-13 22:47 ` [PATCH v2 07/15] efi: Add shared printk wrapper for consistent prefixing Leif Lindholm
` (8 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:46 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Leif Lindholm
From: Roy Franz <roy.franz@linaro.org>
Update efi-stub.txt documentation to be more general
and not x86 specific. Add ARM only "dtb=" command
line option description.
Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
---
Documentation/efi-stub.txt | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/Documentation/efi-stub.txt b/Documentation/efi-stub.txt
index c628788..26be7b0 100644
--- a/Documentation/efi-stub.txt
+++ b/Documentation/efi-stub.txt
@@ -1,13 +1,16 @@
The EFI Boot Stub
---------------------------
-On the x86 platform, a bzImage can masquerade as a PE/COFF image,
-thereby convincing EFI firmware loaders to load it as an EFI
-executable. The code that modifies the bzImage header, along with the
-EFI-specific entry point that the firmware loader jumps to are
-collectively known as the "EFI boot stub", and live in
+On the x86 and ARM platforms, a kernel zImage/bzImage can masquerade
+as a PE/COFF image, thereby convincing EFI firmware loaders to load
+it as an EFI executable. The code that modifies the bzImage header,
+along with the EFI-specific entry point that the firmware loader
+jumps to are collectively known as the "EFI boot stub", and live in
arch/x86/boot/header.S and arch/x86/boot/compressed/eboot.c,
-respectively.
+respectively. For ARM the EFI stub is implemented in
+arch/arm/boot/compressed/efi-header.S and
+arch/arm/boot/compressed/efi-stub.c. EFI stub code that is shared
+between architectures is in drivers/firmware/efi/efi-stub-helper.c.
By using the EFI boot stub it's possible to boot a Linux kernel
without the use of a conventional EFI boot loader, such as grub or
@@ -23,7 +26,9 @@ The bzImage located in arch/x86/boot/bzImage must be copied to the EFI
System Partition (ESP) and renamed with the extension ".efi". Without
the extension the EFI firmware loader will refuse to execute it. It's
not possible to execute bzImage.efi from the usual Linux file systems
-because EFI firmware doesn't have support for them.
+because EFI firmware doesn't have support for them. For ARM the
+arch/arm/boot/zImage should be copied to the system partition, and it
+may not need to be renamed.
**** Passing kernel parameters from the EFI shell
@@ -63,3 +68,11 @@ Notice how bzImage.efi can be specified with a relative path. That's
because the image we're executing is interpreted by the EFI shell,
which understands relative paths, whereas the rest of the command line
is passed to bzImage.efi.
+
+
+**** The "dtb=" option
+
+For the ARM architecture, we also need to be able to provide a device
+tree to the kernel. This is done with the "dtb=" command line option,
+and is processed in the same manner as the "initrd=" option that is
+described above.
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 07/15] efi: Add shared printk wrapper for consistent prefixing
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (5 preceding siblings ...)
2014-03-13 22:46 ` [PATCH v2 06/15] doc: efi-stub.txt updates for ARM Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
2014-03-13 22:47 ` [PATCH v2 09/15] efi: Add shared FDT related functions for ARM/ARM64 Leif Lindholm
` (7 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Leif Lindholm
From: Roy Franz <roy.franz@linaro.org>
Add a wrapper for printk to standardize the prefix for informational and
error messages from the EFI stub.
Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
drivers/firmware/efi/efi-stub-helper.c | 25 ++++++++++++++-----------
1 file changed, 14 insertions(+), 11 deletions(-)
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 661f425..4c8ab86 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -45,6 +45,9 @@ static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
}
}
+#define pr_efi(sys_table, msg) efi_printk(sys_table, "EFI stub: "msg)
+#define pr_efi_err(sys_table, msg) efi_printk(sys_table, "EFI stub: ERROR: "msg)
+
static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
efi_memory_desc_t **map,
@@ -324,7 +327,7 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
nr_files * sizeof(*files),
(void **)&files);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
+ pr_efi_err(sys_table_arg, "Failed to alloc mem for file handle list\n");
goto fail;
}
@@ -376,13 +379,13 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
image->device_handle, &fs_proto,
(void **)&io);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
+ pr_efi_err(sys_table_arg, "Failed to handle fs_proto\n");
goto free_files;
}
status = efi_call_phys2(io->open_volume, io, &fh);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to open volume\n");
+ pr_efi_err(sys_table_arg, "Failed to open volume\n");
goto free_files;
}
}
@@ -390,7 +393,7 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
status = efi_call_phys5(fh->open, fh, &h, filename_16,
EFI_FILE_MODE_READ, (u64)0);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to open file: ");
+ pr_efi_err(sys_table_arg, "Failed to open file: ");
efi_char16_printk(sys_table_arg, filename_16);
efi_printk(sys_table_arg, "\n");
goto close_handles;
@@ -402,7 +405,7 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
status = efi_call_phys4(h->get_info, h, &info_guid,
&info_sz, NULL);
if (status != EFI_BUFFER_TOO_SMALL) {
- efi_printk(sys_table_arg, "Failed to get file info size\n");
+ pr_efi_err(sys_table_arg, "Failed to get file info size\n");
goto close_handles;
}
@@ -411,7 +414,7 @@ grow:
EFI_LOADER_DATA, info_sz,
(void **)&info);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
+ pr_efi_err(sys_table_arg, "Failed to alloc mem for file info\n");
goto close_handles;
}
@@ -427,7 +430,7 @@ grow:
efi_call_phys1(sys_table_arg->boottime->free_pool, info);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to get file info\n");
+ pr_efi_err(sys_table_arg, "Failed to get file info\n");
goto close_handles;
}
@@ -446,13 +449,13 @@ grow:
status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
&file_addr, max_addr);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to alloc highmem for files\n");
+ pr_efi_err(sys_table_arg, "Failed to alloc highmem for files\n");
goto close_handles;
}
/* We've run out of free low memory. */
if (file_addr > max_addr) {
- efi_printk(sys_table_arg, "We've run out of free low memory\n");
+ pr_efi_err(sys_table_arg, "We've run out of free low memory\n");
status = EFI_INVALID_PARAMETER;
goto free_file_total;
}
@@ -473,7 +476,7 @@ grow:
&chunksize,
(void *)addr);
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "Failed to read file\n");
+ pr_efi_err(sys_table_arg, "Failed to read file\n");
goto free_file_total;
}
addr += chunksize;
@@ -558,7 +561,7 @@ static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
&new_addr);
}
if (status != EFI_SUCCESS) {
- efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
+ pr_efi_err(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
return status;
}
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 09/15] efi: Add shared FDT related functions for ARM/ARM64
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (6 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 07/15] efi: Add shared printk wrapper for consistent prefixing Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
2014-03-13 22:47 ` [PATCH v2 10/15] arm64: Add function to create identity mappings Leif Lindholm
` (6 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Leif Lindholm
From: Roy Franz <roy.franz@linaro.org>
Both ARM and ARM64 stubs will update the device tree that they pass to
the kernel. In both cases they primarily need to add the same UEFI
related information, so the function can be shared. Create a new FDT
related file for this to avoid use of architecture #ifdefs in
efi-stub-helper.c.
Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
---
drivers/firmware/efi/fdt.c | 268 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/efi.h | 3 +
2 files changed, 271 insertions(+)
create mode 100644 drivers/firmware/efi/fdt.c
diff --git a/drivers/firmware/efi/fdt.c b/drivers/firmware/efi/fdt.c
new file mode 100644
index 0000000..4510f97
--- /dev/null
+++ b/drivers/firmware/efi/fdt.c
@@ -0,0 +1,268 @@
+/*
+ * FDT related Helper functions used by the EFI stub on multiple
+ * architectures. This should be #included by the EFI stub
+ * implementation files.
+ *
+ * Copyright 2013 Linaro Limited; author Roy Franz
+ *
+ * This file is part of the Linux kernel, and is made available
+ * under the terms of the GNU General Public License version 2.
+ *
+ */
+
+static efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
+ unsigned long orig_fdt_size,
+ void *fdt, int new_fdt_size, char *cmdline_ptr,
+ u64 initrd_addr, u64 initrd_size,
+ efi_memory_desc_t *memory_map,
+ unsigned long map_size, unsigned long desc_size,
+ u32 desc_ver)
+{
+ int node;
+ int status;
+ u32 fdt_val32;
+ u64 fdt_val64;
+
+ /*
+ * Copy definition of linux_banner here. Since this code is
+ * built as part of the decompressor for ARM v7, pulling
+ * in version.c where linux_banner is defined for the
+ * kernel brings other kernel dependencies with it.
+ */
+ const char linux_banner[] =
+ "Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@"
+ LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
+
+ /* Do some checks on provided FDT, if it exists*/
+ if (orig_fdt) {
+ if (fdt_check_header(orig_fdt)) {
+ pr_efi_err(sys_table, "Device Tree header not valid!\n");
+ return EFI_LOAD_ERROR;
+ }
+ /*
+ * We don't get the size of the FDT if we get if from a
+ * configuration table.
+ */
+ if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
+ pr_efi_err(sys_table, "Truncated device tree! foo!\n");
+ return EFI_LOAD_ERROR;
+ }
+ }
+
+ if (orig_fdt)
+ status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
+ else
+ status = fdt_create_empty_tree(fdt, new_fdt_size);
+
+ if (status != 0)
+ goto fdt_set_fail;
+
+ /* Delete any memory nodes present */
+ while ((node = fdt_subnode_offset(fdt, 0, "memory")) >= 0)
+ fdt_del_node(fdt, node);
+
+ node = fdt_subnode_offset(fdt, 0, "chosen");
+ if (node < 0) {
+ node = fdt_add_subnode(fdt, 0, "chosen");
+ if (node < 0) {
+ status = node; /* node is error code when negative */
+ goto fdt_set_fail;
+ }
+ }
+
+ if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
+ status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
+ strlen(cmdline_ptr) + 1);
+ if (status)
+ goto fdt_set_fail;
+ }
+
+ /* Set initrd address/end in device tree, if present */
+ if (initrd_size != 0) {
+ u64 initrd_image_end;
+ u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
+ status = fdt_setprop(fdt, node, "linux,initrd-start",
+ &initrd_image_start, sizeof(u64));
+ if (status)
+ goto fdt_set_fail;
+ initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
+ status = fdt_setprop(fdt, node, "linux,initrd-end",
+ &initrd_image_end, sizeof(u64));
+ if (status)
+ goto fdt_set_fail;
+ }
+
+ /* Add FDT entries for EFI runtime services in chosen node. */
+ node = fdt_subnode_offset(fdt, 0, "chosen");
+ fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
+ status = fdt_setprop(fdt, node, "linux,uefi-system-table",
+ &fdt_val64, sizeof(fdt_val64));
+ if (status)
+ goto fdt_set_fail;
+
+ fdt_val64 = cpu_to_fdt64((u64)(unsigned long)memory_map);
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
+ &fdt_val64, sizeof(fdt_val64));
+ if (status)
+ goto fdt_set_fail;
+
+ fdt_val32 = cpu_to_fdt32(map_size);
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
+ &fdt_val32, sizeof(fdt_val32));
+ if (status)
+ goto fdt_set_fail;
+
+ fdt_val32 = cpu_to_fdt32(desc_size);
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
+ &fdt_val32, sizeof(fdt_val32));
+ if (status)
+ goto fdt_set_fail;
+
+ fdt_val32 = cpu_to_fdt32(desc_ver);
+ status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
+ &fdt_val32, sizeof(fdt_val32));
+ if (status)
+ goto fdt_set_fail;
+
+ /*
+ * Add kernel version banner so stub/kernel match can be
+ * verified.
+ */
+ status = fdt_setprop_string(fdt, node, "linux,uefi-stub-kern-ver",
+ linux_banner);
+ if (status)
+ goto fdt_set_fail;
+
+ return EFI_SUCCESS;
+
+fdt_set_fail:
+ if (status == -FDT_ERR_NOSPACE)
+ return EFI_BUFFER_TOO_SMALL;
+
+ return EFI_LOAD_ERROR;
+}
+
+#ifndef EFI_FDT_ALIGN
+#define EFI_FDT_ALIGN EFI_PAGE_SIZE
+#endif
+
+/*
+ * Allocate memory for a new FDT, then add EFI, commandline, and
+ * initrd related fields to the FDT. This routine increases the
+ * FDT allocation size until the allocated memory is large
+ * enough. EFI allocations are in EFI_PAGE_SIZE granules,
+ * which are fixed at 4K bytes, so in most cases the first
+ * allocation should succeed.
+ * EFI boot services are exited at the end of this function.
+ * There must be no allocations between the get_memory_map()
+ * call and the exit_boot_services() call, so the exiting of
+ * boot services is very tightly tied to the creation of the FDT
+ * with the final memory map in it.
+ */
+
+efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
+ void *handle,
+ unsigned long *new_fdt_addr,
+ unsigned long max_addr,
+ u64 initrd_addr, u64 initrd_size,
+ char *cmdline_ptr,
+ unsigned long fdt_addr,
+ unsigned long fdt_size)
+{
+ unsigned long map_size, desc_size;
+ u32 desc_ver;
+ unsigned long mmap_key;
+ efi_memory_desc_t *memory_map;
+ unsigned long new_fdt_size;
+ efi_status_t status;
+
+ /*
+ * Estimate size of new FDT, and allocate memory for it. We
+ * will allocate a bigger buffer if this ends up being too
+ * small, so a rough guess is OK here.
+ */
+ new_fdt_size = fdt_size + EFI_PAGE_SIZE;
+ while (1) {
+ status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN,
+ new_fdt_addr, max_addr);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
+ goto fail;
+ }
+
+ /*
+ * Now that we have done our final memory allocation (and free)
+ * we can get the memory map key needed for
+ * exit_boot_services().
+ */
+ status = efi_get_memory_map(sys_table, &memory_map, &map_size,
+ &desc_size, &desc_ver, &mmap_key);
+ if (status != EFI_SUCCESS)
+ goto fail_free_new_fdt;
+
+ status = update_fdt(sys_table,
+ (void *)fdt_addr, fdt_size,
+ (void *)*new_fdt_addr, new_fdt_size,
+ cmdline_ptr, initrd_addr, initrd_size,
+ memory_map, map_size, desc_size, desc_ver);
+
+ /* Succeeding the first time is the expected case. */
+ if (status == EFI_SUCCESS)
+ break;
+
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ /*
+ * We need to allocate more space for the new
+ * device tree, so free existing buffer that is
+ * too small. Also free memory map, as we will need
+ * to get new one that reflects the free/alloc we do
+ * on the device tree buffer.
+ */
+ efi_free(sys_table, new_fdt_size, *new_fdt_addr);
+ efi_call_phys1(sys_table->boottime->free_pool,
+ memory_map);
+ new_fdt_size += EFI_PAGE_SIZE;
+ } else {
+ pr_efi_err(sys_table, "Unable to constuct new device tree.\n");
+ goto fail_free_mmap;
+ }
+ }
+
+ /* Now we are ready to exit_boot_services.*/
+ status = efi_call_phys2(sys_table->boottime->exit_boot_services,
+ handle, mmap_key);
+
+
+ if (status == EFI_SUCCESS)
+ return status;
+
+ pr_efi_err(sys_table, "Exit boot services failed.\n");
+
+fail_free_mmap:
+ efi_call_phys1(sys_table->boottime->free_pool, memory_map);
+
+fail_free_new_fdt:
+ efi_free(sys_table, new_fdt_size, *new_fdt_addr);
+
+fail:
+ return EFI_LOAD_ERROR;
+}
+
+static void *get_fdt(efi_system_table_t *sys_table)
+{
+ efi_guid_t fdt_guid = EFI_DEVICE_TREE_GUID;
+ efi_config_table_t *tables;
+ void *fdt;
+ int i;
+
+ tables = (efi_config_table_t *) sys_table->tables;
+ fdt = NULL;
+
+ for (i = 0; i < sys_table->nr_tables; i++)
+ if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
+ fdt = (void *) tables[i].table;
+ break;
+ }
+
+ return fdt;
+}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index d450673..cd112bb 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -394,6 +394,9 @@ typedef efi_status_t efi_query_variable_store_t(u32 attributes, unsigned long si
#define EFI_FILE_SYSTEM_GUID \
EFI_GUID( 0x964e5b22, 0x6459, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
+#define EFI_DEVICE_TREE_GUID \
+ EFI_GUID( 0xb1b621d5, 0xf19c, 0x41a5, 0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0 )
+
typedef struct {
efi_guid_t guid;
u64 table;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 10/15] arm64: Add function to create identity mappings
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (7 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 09/15] efi: Add shared FDT related functions for ARM/ARM64 Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
2014-03-13 22:47 ` [PATCH v2 11/15] arm64: add EFI stub Leif Lindholm
` (5 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Leif Lindholm
From: Mark Salter <msalter@redhat.com>
At boot time, before switching to a virtual UEFI memory map, firmware
expects UEFI memory and IO regions to be identity mapped whenever
kernel makes runtime services calls. The existing early boot code
creates an identity map of kernel text/data but this is not sufficient
for UEFI. This patch adds a create_id_mapping() function which reuses
the core code of the existing create_mapping().
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
arch/arm64/include/asm/mmu.h | 2 ++
arch/arm64/mm/mmu.c | 65 ++++++++++++++++++++++++++++++------------
2 files changed, 49 insertions(+), 18 deletions(-)
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
index f600d40..29ed1d8 100644
--- a/arch/arm64/include/asm/mmu.h
+++ b/arch/arm64/include/asm/mmu.h
@@ -28,5 +28,7 @@ extern void paging_init(void);
extern void setup_mm_for_reboot(void);
extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
extern void init_mem_pgprot(void);
+/* create an identity mapping for memory (or io if map_io is true) */
+extern void create_id_mapping(phys_addr_t addr, phys_addr_t size, int map_io);
#endif
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 6b7e895..357956a 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -168,7 +168,8 @@ static void __init *early_alloc(unsigned long sz)
}
static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
- unsigned long end, unsigned long pfn)
+ unsigned long end, unsigned long pfn,
+ pgprot_t prot)
{
pte_t *pte;
@@ -180,16 +181,28 @@ static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
pte = pte_offset_kernel(pmd, addr);
do {
- set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
+ set_pte(pte, pfn_pte(pfn, prot));
pfn++;
} while (pte++, addr += PAGE_SIZE, addr != end);
}
static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
- unsigned long end, phys_addr_t phys)
+ unsigned long end, phys_addr_t phys,
+ int map_io)
{
pmd_t *pmd;
unsigned long next;
+ pmdval_t prot_sect;
+ pgprot_t prot_pte;
+
+ if (map_io) {
+ prot_sect = PMD_TYPE_SECT | PMD_SECT_AF |
+ PMD_ATTRINDX(MT_DEVICE_nGnRE);
+ prot_pte = __pgprot(PROT_DEVICE_nGnRE);
+ } else {
+ prot_sect = prot_sect_kernel;
+ prot_pte = PAGE_KERNEL_EXEC;
+ }
/*
* Check for initial section mappings in the pgd/pud and remove them.
@@ -205,7 +218,7 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
/* try section mapping first */
if (((addr | next | phys) & ~SECTION_MASK) == 0) {
pmd_t old_pmd =*pmd;
- set_pmd(pmd, __pmd(phys | prot_sect_kernel));
+ set_pmd(pmd, __pmd(phys | prot_sect));
/*
* Check for previous table entries created during
* boot (__create_page_tables) and flush them.
@@ -213,21 +226,23 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
if (!pmd_none(old_pmd))
flush_tlb_all();
} else {
- alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys));
+ alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys),
+ prot_pte);
}
phys += next - addr;
} while (pmd++, addr = next, addr != end);
}
static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
- unsigned long end, unsigned long phys)
+ unsigned long end, unsigned long phys,
+ int map_io)
{
pud_t *pud = pud_offset(pgd, addr);
unsigned long next;
do {
next = pud_addr_end(addr, end);
- alloc_init_pmd(pud, addr, next, phys);
+ alloc_init_pmd(pud, addr, next, phys, map_io);
phys += next - addr;
} while (pud++, addr = next, addr != end);
}
@@ -236,30 +251,44 @@ static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
* Create the page directory entries and any necessary page tables for the
* mapping specified by 'md'.
*/
-static void __init create_mapping(phys_addr_t phys, unsigned long virt,
- phys_addr_t size)
+static void __init __create_mapping(pgd_t *pgd, phys_addr_t phys,
+ unsigned long virt, phys_addr_t size,
+ int map_io)
{
unsigned long addr, length, end, next;
- pgd_t *pgd;
-
- if (virt < VMALLOC_START) {
- pr_warning("BUG: not creating mapping for 0x%016llx at 0x%016lx - outside kernel range\n",
- phys, virt);
- return;
- }
addr = virt & PAGE_MASK;
length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
- pgd = pgd_offset_k(addr);
end = addr + length;
do {
next = pgd_addr_end(addr, end);
- alloc_init_pud(pgd, addr, next, phys);
+ alloc_init_pud(pgd, addr, next, phys, map_io);
phys += next - addr;
} while (pgd++, addr = next, addr != end);
}
+static void __init create_mapping(phys_addr_t phys, unsigned long virt,
+ phys_addr_t size)
+{
+ if (virt < VMALLOC_START) {
+ pr_warn("BUG: not creating mapping for 0x%016llx at 0x%016lx - outside kernel range\n",
+ phys, virt);
+ return;
+ }
+ __create_mapping(pgd_offset_k(virt & PAGE_MASK), phys, virt, size, 0);
+}
+
+void __init create_id_mapping(phys_addr_t addr, phys_addr_t size, int map_io)
+{
+ if ((addr >> PGDIR_SHIFT) >= ARRAY_SIZE(idmap_pg_dir)) {
+ pr_warn("BUG: not creating id mapping for 0x%016llx\n", addr);
+ return;
+ }
+ __create_mapping(&idmap_pg_dir[pgd_index(addr)],
+ addr, addr, size, map_io);
+}
+
static void __init map_mem(void)
{
struct memblock_region *reg;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 11/15] arm64: add EFI stub
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (8 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 10/15] arm64: Add function to create identity mappings Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
[not found] ` <1394750828-16351-12-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2014-03-13 22:47 ` [PATCH v2 12/15] doc: arm64: add description of EFI stub support Leif Lindholm
` (4 subsequent siblings)
14 siblings, 1 reply; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Ard Biesheuvel, Leif Lindholm
From: Mark Salter <msalter@redhat.com>
This patch adds PE/COFF header fields to the start of the Image
so that it appears as an EFI application to EFI firmware. An EFI
stub is included to allow direct booting of the kernel Image.
Support in the COFF header for signed images was provided by
Ard Biesheuvel.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
arch/arm64/Kconfig | 10 +++
arch/arm64/kernel/Makefile | 3 +
arch/arm64/kernel/efi-entry.S | 93 +++++++++++++++++++++++++
arch/arm64/kernel/efi-stub.c | 83 ++++++++++++++++++++++
arch/arm64/kernel/head.S | 112 ++++++++++++++++++++++++++++++
drivers/firmware/efi/arm-stub.c | 144 +++++++++++++++++++++++++++++++++++++++
6 files changed, 445 insertions(+)
create mode 100644 arch/arm64/kernel/efi-entry.S
create mode 100644 arch/arm64/kernel/efi-stub.c
create mode 100644 drivers/firmware/efi/arm-stub.c
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index da4304a..6333d49 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -259,6 +259,16 @@ config CMDLINE_FORCE
This is useful if you cannot or don't want to change the
command-line options your boot loader passes to the kernel.
+config EFI_STUB
+ bool "EFI stub support"
+ depends on OF
+ select LIBFDT
+ default y
+ help
+ This kernel feature allows an Image to be loaded directly
+ by EFI firmware without the use of a bootloader.
+ See Documentation/efi-stub.txt for more information.
+
endmenu
menu "Userspace binary formats"
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 2d4554b..0f60b45 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -4,6 +4,8 @@
CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET)
AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
+CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) \
+ -I$(src)/../../../scripts/dtc/libfdt
# Object file lists.
arm64-obj-y := cputable.o debug-monitors.o entry.o irq.o fpsimd.o \
@@ -20,6 +22,7 @@ arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT)+= hw_breakpoint.o
arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
+arm64-obj-$(CONFIG_EFI_STUB) += efi-stub.o efi-entry.o
obj-y += $(arm64-obj-y) vdso/
obj-m += $(arm64-obj-m)
diff --git a/arch/arm64/kernel/efi-entry.S b/arch/arm64/kernel/efi-entry.S
new file mode 100644
index 0000000..bfe8c9b
--- /dev/null
+++ b/arch/arm64/kernel/efi-entry.S
@@ -0,0 +1,93 @@
+/*
+ * EFI entry point.
+ *
+ * Copyright (C) 2013 Red Hat, Inc.
+ * Author: Mark Salter <msalter@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+#include <asm/assembler.h>
+
+#define EFI_LOAD_ERROR 0x8000000000000001
+
+ __INIT
+
+ /*
+ * We arrive here from the EFI boot manager with:
+ *
+ * * MMU on with identity-mapped RAM.
+ * * Icache and Dcache on
+ *
+ * We will most likely be running from some place other than where
+ * we want to be. The kernel image wants to be placed at TEXT_OFFSET
+ * from start of RAM.
+ */
+ENTRY(efi_stub_entry)
+ stp x29, x30, [sp, #-32]!
+
+ /*
+ * Call efi_entry to do the real work.
+ * x0 and x1 are already set up by firmware. Current runtime
+ * address of image is calculated and passed via *image_addr.
+ *
+ * unsigned long efi_entry(void *handle,
+ * efi_system_table_t *sys_table,
+ * unsigned long *image_addr) ;
+ */
+ adrp x8, _text
+ add x8, x8, #:lo12:_text
+ add x2, sp, 16
+ str x8, [x2]
+ bl efi_entry
+ cmn x0, #1
+ b.eq efi_load_fail
+
+ /*
+ * efi_entry() will have relocated the kernel image if necessary
+ * and we return here with device tree address in x0 and the kernel
+ * entry point stored at *image_addr. Save those values in registers
+ * which are preserved by __flush_dcache_all.
+ */
+ ldr x1, [sp, #16]
+ mov x20, x0
+ mov x21, x1
+
+ /* Turn off Dcache and MMU */
+ mrs x0, CurrentEL
+ cmp x0, #PSR_MODE_EL2t
+ ccmp x0, #PSR_MODE_EL2h, #0x4, ne
+ b.ne 1f
+ mrs x0, sctlr_el2
+ bic x0, x0, #1 << 0 // clear SCTLR.M
+ bic x0, x0, #1 << 2 // clear SCTLR.C
+ msr sctlr_el2, x0
+ isb
+ b 2f
+1:
+ mrs x0, sctlr_el1
+ bic x0, x0, #1 << 0 // clear SCTLR.M
+ bic x0, x0, #1 << 2 // clear SCTLR.C
+ msr sctlr_el1, x0
+ isb
+2:
+ bl __flush_dcache_all
+
+ /* Jump to real entry point */
+ mov x0, x20
+ mov x1, xzr
+ mov x2, xzr
+ mov x3, xzr
+ br x21
+
+efi_load_fail:
+ mov x0, #EFI_LOAD_ERROR
+ ldp x29, x30, [sp], #32
+ ret
+
+ENDPROC(efi_stub_entry)
diff --git a/arch/arm64/kernel/efi-stub.c b/arch/arm64/kernel/efi-stub.c
new file mode 100644
index 0000000..bf30913
--- /dev/null
+++ b/arch/arm64/kernel/efi-stub.c
@@ -0,0 +1,83 @@
+/*
+ * linux/arch/arm/boot/compressed/efi-stub.c
+ *
+ * Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org>
+ *
+ * This file implements the EFI boot stub for the arm64 kernel.
+ * Adapted from ARM version by Mark Salter <msalter@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/efi.h>
+#include <linux/libfdt.h>
+#include <asm/sections.h>
+#include <generated/compile.h>
+#include <generated/utsrelease.h>
+
+/*
+ * EFI function call wrappers. These are not required for arm/arm64, but
+ * wrappers are required for X86 to convert between ABIs. These wrappers are
+ * provided to allow code sharing between X86 and other architectures. Since
+ * these wrappers directly invoke the EFI function pointer, the function
+ * pointer type must be properly defined, which is not the case for X86. One
+ * advantage of this is it allows for type checking of arguments, which is not
+ * possible with the X86 wrappers.
+ */
+#define efi_call_phys0(f) f()
+#define efi_call_phys1(f, a1) f(a1)
+#define efi_call_phys2(f, a1, a2) f(a1, a2)
+#define efi_call_phys3(f, a1, a2, a3) f(a1, a2, a3)
+#define efi_call_phys4(f, a1, a2, a3, a4) f(a1, a2, a3, a4)
+#define efi_call_phys5(f, a1, a2, a3, a4, a5) f(a1, a2, a3, a4, a5)
+
+/*
+ * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
+ * start of kernel and may not cross a 2MiB boundary. We set alignment to
+ * 2MiB so we know it won't cross a 2MiB boundary.
+ */
+#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
+#define MAX_FDT_OFFSET SZ_512M
+
+/* Include shared EFI stub code */
+#include "../../../drivers/firmware/efi/efi-stub-helper.c"
+#include "../../../drivers/firmware/efi/fdt.c"
+#include "../../../drivers/firmware/efi/arm-stub.c"
+
+
+static efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
+ unsigned long *image_addr,
+ unsigned long *image_size,
+ unsigned long *reserve_addr,
+ unsigned long *reserve_size,
+ unsigned long dram_base,
+ efi_loaded_image_t *image)
+{
+ efi_status_t status;
+ unsigned long kernel_size, kernel_memsize = 0;
+
+ /* Relocate the image, if required. */
+ kernel_size = _edata - _text;
+ if (*image_addr != (dram_base + TEXT_OFFSET)) {
+ kernel_memsize = kernel_size + (_end - _edata);
+ status = efi_relocate_kernel(sys_table, image_addr,
+ kernel_size, kernel_memsize,
+ dram_base + TEXT_OFFSET,
+ PAGE_SIZE);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Failed to relocate kernel\n");
+ return status;
+ }
+ if (*image_addr != (dram_base + TEXT_OFFSET)) {
+ pr_efi_err(sys_table, "Failed to alloc kernel memory\n");
+ efi_free(sys_table, kernel_memsize, *image_addr);
+ return EFI_ERROR;
+ }
+ *image_size = kernel_memsize;
+ }
+
+
+ return EFI_SUCCESS;
+}
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index c86bfdf..2f07979 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -107,8 +107,18 @@
/*
* DO NOT MODIFY. Image header expected by Linux boot-loaders.
*/
+#ifdef CONFIG_EFI_STUB
+ /*
+ * Magic "MZ" signature for PE/COFF
+ * Little Endian: add x13, x18, #0x16
+ */
+efi_head:
+ .long 0x91005a4d
+ b stext
+#else
b stext // branch to kernel start, magic
.long 0 // reserved
+#endif
.quad TEXT_OFFSET // Image load offset from start of RAM
.quad 0 // reserved
.quad 0 // reserved
@@ -119,7 +129,109 @@
.byte 0x52
.byte 0x4d
.byte 0x64
+#ifdef CONFIG_EFI_STUB
+ .long pe_header - efi_head // Offset to the PE header.
+#else
.word 0 // reserved
+#endif
+
+#ifdef CONFIG_EFI_STUB
+ .align 3
+pe_header:
+ .ascii "PE"
+ .short 0
+coff_header:
+ .short 0xaa64 // AArch64
+ .short 2 // nr_sections
+ .long 0 // TimeDateStamp
+ .long 0 // PointerToSymbolTable
+ .long 1 // NumberOfSymbols
+ .short section_table - optional_header // SizeOfOptionalHeader
+ .short 0x206 // Characteristics.
+ // IMAGE_FILE_DEBUG_STRIPPED |
+ // IMAGE_FILE_EXECUTABLE_IMAGE |
+ // IMAGE_FILE_LINE_NUMS_STRIPPED
+optional_header:
+ .short 0x20b // PE32+ format
+ .byte 0x02 // MajorLinkerVersion
+ .byte 0x14 // MinorLinkerVersion
+ .long _edata - stext // SizeOfCode
+ .long 0 // SizeOfInitializedData
+ .long 0 // SizeOfUninitializedData
+ .long efi_stub_entry - efi_head // AddressOfEntryPoint
+ .long stext - efi_head // BaseOfCode
+
+extra_header_fields:
+ .quad 0 // ImageBase
+ .long 0x20 // SectionAlignment
+ .long 0x8 // FileAlignment
+ .short 0 // MajorOperatingSystemVersion
+ .short 0 // MinorOperatingSystemVersion
+ .short 0 // MajorImageVersion
+ .short 0 // MinorImageVersion
+ .short 0 // MajorSubsystemVersion
+ .short 0 // MinorSubsystemVersion
+ .long 0 // Win32VersionValue
+
+ .long _edata - efi_head // SizeOfImage
+
+ // Everything before the kernel image is considered part of the header
+ .long stext - efi_head // SizeOfHeaders
+ .long 0 // CheckSum
+ .short 0xa // Subsystem (EFI application)
+ .short 0 // DllCharacteristics
+ .quad 0 // SizeOfStackReserve
+ .quad 0 // SizeOfStackCommit
+ .quad 0 // SizeOfHeapReserve
+ .quad 0 // SizeOfHeapCommit
+ .long 0 // LoaderFlags
+ .long 0x6 // NumberOfRvaAndSizes
+
+ .quad 0 // ExportTable
+ .quad 0 // ImportTable
+ .quad 0 // ResourceTable
+ .quad 0 // ExceptionTable
+ .quad 0 // CertificationTable
+ .quad 0 // BaseRelocationTable
+
+ // Section table
+section_table:
+
+ /*
+ * The EFI application loader requires a relocation section
+ * because EFI applications must be relocatable. This is a
+ * dummy section as far as we are concerned.
+ */
+ .ascii ".reloc"
+ .byte 0
+ .byte 0 // end of 0 padding of section name
+ .long 0
+ .long 0
+ .long 0 // SizeOfRawData
+ .long 0 // PointerToRawData
+ .long 0 // PointerToRelocations
+ .long 0 // PointerToLineNumbers
+ .short 0 // NumberOfRelocations
+ .short 0 // NumberOfLineNumbers
+ .long 0x42100040 // Characteristics (section flags)
+
+
+ .ascii ".text"
+ .byte 0
+ .byte 0
+ .byte 0 // end of 0 padding of section name
+ .long _edata - stext // VirtualSize
+ .long stext - efi_head // VirtualAddress
+ .long _edata - stext // SizeOfRawData
+ .long stext - efi_head // PointerToRawData
+
+ .long 0 // PointerToRelocations (0 for executables)
+ .long 0 // PointerToLineNumbers (0 for executables)
+ .short 0 // NumberOfRelocations (0 for executables)
+ .short 0 // NumberOfLineNumbers (0 for executables)
+ .long 0xe0500020 // Characteristics (section flags)
+ .align 5
+#endif
ENTRY(stext)
mov x21, x0 // x21=FDT
diff --git a/drivers/firmware/efi/arm-stub.c b/drivers/firmware/efi/arm-stub.c
new file mode 100644
index 0000000..b505fde
--- /dev/null
+++ b/drivers/firmware/efi/arm-stub.c
@@ -0,0 +1,144 @@
+/*
+ * EFI stub implementation that is shared by arm and arm64 architectures.
+ * This should be #included by the EFI stub implementation files.
+ *
+ * Copyright (C) 2013,2014 Linaro Limited
+ * Roy Franz <roy.franz@linaro.org
+ * Copyright (C) 2013 Red Hat, Inc.
+ * Mark Salter <msalter@redhat.com>
+ *
+ * This file is part of the Linux kernel, and is made available under the
+ * terms of the GNU General Public License version 2.
+ *
+ */
+
+/*
+ * This function handles the architcture specific differences between arm and
+ * arm64 regarding where the kernel image must be loaded and any memory that
+ * must be reserved. On failure it is required to free all
+ * all allocations it has made.
+ */
+static efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
+ unsigned long *image_addr,
+ unsigned long *image_size,
+ unsigned long *reserve_addr,
+ unsigned long *reserve_size,
+ unsigned long dram_base,
+ efi_loaded_image_t *image);
+/*
+ * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint
+ * that is described in the PE/COFF header. Most of the code is the same
+ * for both archictectures, with the arch-specific code provided in the
+ * handle_kernel_image() function.
+ */
+unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
+ unsigned long *image_addr)
+{
+ efi_loaded_image_t *image;
+ efi_status_t status;
+ unsigned long image_size = 0;
+ unsigned long dram_base;
+ /* addr/point and size pairs for memory management*/
+ unsigned long initrd_addr;
+ u64 initrd_size = 0;
+ unsigned long fdt_addr; /* Original DTB */
+ u64 fdt_size = 0; /* We don't get size from configuration table */
+ char *cmdline_ptr = NULL;
+ int cmdline_size = 0;
+ unsigned long new_fdt_addr;
+ efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
+ unsigned long reserve_addr = 0;
+ unsigned long reserve_size = 0;
+
+ /* Check if we were booted by the EFI firmware */
+ if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
+ goto fail;
+
+ pr_efi(sys_table, "Booting Linux Kernel...\n");
+
+ /*
+ * Get a handle to the loaded image protocol. This is used to get
+ * information about the running image, such as size and the command
+ * line.
+ */
+ status = efi_call_phys3(sys_table->boottime->handle_protocol,
+ handle, &loaded_image_proto, (void *)&image);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Failed to get loaded image protocol\n");
+ goto fail;
+ }
+
+ dram_base = get_dram_base(sys_table);
+ if (dram_base == EFI_ERROR) {
+ pr_efi_err(sys_table, "Failed to find DRAM base\n");
+ goto fail;
+ }
+ status = handle_kernel_image(sys_table, image_addr, &image_size,
+ &reserve_addr,
+ &reserve_size,
+ dram_base, image);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Failed to relocate kernel\n");
+ goto fail;
+ }
+
+ /*
+ * Get the command line from EFI, using the LOADED_IMAGE
+ * protocol. We are going to copy the command line into the
+ * device tree, so this can be allocated anywhere.
+ */
+ cmdline_ptr = efi_convert_cmdline(sys_table, image, &cmdline_size);
+ if (!cmdline_ptr) {
+ pr_efi_err(sys_table, "getting command line via LOADED_IMAGE_PROTOCOL\n");
+ goto fail_free_image;
+ }
+
+ /* Load a device tree from the configuration table, if present. */
+ fdt_addr = (uintptr_t)get_fdt(sys_table);
+ if (!fdt_addr) {
+ status = handle_cmdline_files(sys_table, image, cmdline_ptr,
+ "dtb=",
+ ~0UL, (unsigned long *)&fdt_addr,
+ (unsigned long *)&fdt_size);
+
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Failed to load device tree!\n");
+ goto fail_free_cmdline;
+ }
+ }
+
+ status = handle_cmdline_files(sys_table, image, cmdline_ptr,
+ "initrd=", dram_base + SZ_512M,
+ (unsigned long *)&initrd_addr,
+ (unsigned long *)&initrd_size);
+ if (status != EFI_SUCCESS)
+ pr_efi_err(sys_table, "Failed initrd from command line!\n");
+
+ new_fdt_addr = fdt_addr;
+ status = allocate_new_fdt_and_exit_boot(sys_table, handle,
+ &new_fdt_addr, dram_base + MAX_FDT_OFFSET,
+ initrd_addr, initrd_size, cmdline_ptr,
+ fdt_addr, fdt_size);
+
+ /*
+ * If all went well, we need to return the FDT address to the
+ * calling function so it can be passed to kernel as part of
+ * the kernel boot protocol.
+ */
+ if (status == EFI_SUCCESS)
+ return new_fdt_addr;
+
+ pr_efi_err(sys_table, "Failed to update FDT and exit boot services\n");
+
+ efi_free(sys_table, initrd_size, initrd_addr);
+ efi_free(sys_table, fdt_size, fdt_addr);
+
+fail_free_cmdline:
+ efi_free(sys_table, cmdline_size, (unsigned long)cmdline_ptr);
+
+fail_free_image:
+ efi_free(sys_table, image_size, *image_addr);
+ efi_free(sys_table, reserve_size, reserve_addr);
+fail:
+ return EFI_ERROR;
+}
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 12/15] doc: arm64: add description of EFI stub support
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (9 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 11/15] arm64: add EFI stub Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
2014-03-13 22:47 ` [PATCH v2 13/15] arm64: add EFI runtime services Leif Lindholm
` (3 subsequent siblings)
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Leif Lindholm, linux-doc, Rob Landley
From: Mark Salter <msalter@redhat.com>
Add explanation of arm64 EFI stub and kernel image header changes
needed to masquerade as a PE/COFF application.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
CC: linux-doc@vger.kernel.org
CC: Rob Landley <rob@landley.net>
---
Documentation/arm64/booting.txt | 4 ++++
Documentation/efi-stub.txt | 12 +++++++++---
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index a9691cc..aa95d38c 100644
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -85,6 +85,10 @@ The decompressed kernel image contains a 64-byte header as follows:
Header notes:
- code0/code1 are responsible for branching to stext.
+- when booting through EFI, code0/code1 are initially skipped.
+ res5 is an offset to the PE header and the PE header has the EFI
+ entry point (efi_stub_entry). When the stub has done its work, it
+ jumps to code0 to resume the normal boot process.
The image must be placed at the specified offset (currently 0x80000)
from the start of the system RAM and called there. The start of the
diff --git a/Documentation/efi-stub.txt b/Documentation/efi-stub.txt
index 26be7b0..7747024 100644
--- a/Documentation/efi-stub.txt
+++ b/Documentation/efi-stub.txt
@@ -12,6 +12,11 @@ arch/arm/boot/compressed/efi-header.S and
arch/arm/boot/compressed/efi-stub.c. EFI stub code that is shared
between architectures is in drivers/firmware/efi/efi-stub-helper.c.
+For arm64, there is no compressed kernel support, so the Image itself
+masquerades as a PE/COFF image and the EFI stub is linked into the
+kernel. The arm64 EFI stub lives in arch/arm64/kernel/efi-entry.S
+and arch/arm64/kernel/efi-stub.c.
+
By using the EFI boot stub it's possible to boot a Linux kernel
without the use of a conventional EFI boot loader, such as grub or
elilo. Since the EFI boot stub performs the jobs of a boot loader, in
@@ -28,7 +33,8 @@ the extension the EFI firmware loader will refuse to execute it. It's
not possible to execute bzImage.efi from the usual Linux file systems
because EFI firmware doesn't have support for them. For ARM the
arch/arm/boot/zImage should be copied to the system partition, and it
-may not need to be renamed.
+may not need to be renamed. Similarly for arm64, arch/arm64/boot/Image
+should be copied but not necessarily renamed.
**** Passing kernel parameters from the EFI shell
@@ -72,7 +78,7 @@ is passed to bzImage.efi.
**** The "dtb=" option
-For the ARM architecture, we also need to be able to provide a device
-tree to the kernel. This is done with the "dtb=" command line option,
+For the ARM and arm64 architectures, we also need to be able to provide a
+device tree to the kernel. This is done with the "dtb=" command line option,
and is processed in the same manner as the "initrd=" option that is
described above.
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 13/15] arm64: add EFI runtime services
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (10 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 12/15] doc: arm64: add description of EFI stub support Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
[not found] ` <1394750828-16351-14-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2014-03-13 22:47 ` [PATCH v2 14/15] doc: arm: add UEFI support documentation Leif Lindholm
` (2 subsequent siblings)
14 siblings, 1 reply; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Leif Lindholm
From: Mark Salter <msalter@redhat.com>
This patch adds EFI runtime support for arm64. The runtime support allows
the kernel to access various EFI runtime services provided by EFI firmware.
Things like reboot, real time clock, EFI boot variables, and others.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
arch/arm64/Kconfig | 16 ++
arch/arm64/include/asm/efi.h | 14 ++
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/efi.c | 465 ++++++++++++++++++++++++++++++++++++++++++
arch/arm64/kernel/setup.c | 5 +
init/main.c | 4 +
6 files changed, 505 insertions(+)
create mode 100644 arch/arm64/include/asm/efi.h
create mode 100644 arch/arm64/kernel/efi.c
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6333d49..52d846e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -259,6 +259,20 @@ config CMDLINE_FORCE
This is useful if you cannot or don't want to change the
command-line options your boot loader passes to the kernel.
+config EFI
+ bool "EFI runtime service support"
+ depends on OF
+ select UCS2_STRING
+ select LIBFDT
+ select UEFI_PARAMS_FROM_FDT
+ help
+ This enables the kernel to use UEFI runtime services that are
+ available (such as the UEFI variable services).
+
+ This option is only useful on systems that have UEFI firmware.
+ However, even with this option, the resultant kernel should
+ continue to boot on existing non-UEFI platforms.
+
config EFI_STUB
bool "EFI stub support"
depends on OF
@@ -318,6 +332,8 @@ source "net/Kconfig"
source "drivers/Kconfig"
+source "drivers/firmware/Kconfig"
+
source "fs/Kconfig"
source "arch/arm64/kvm/Kconfig"
diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
new file mode 100644
index 0000000..5a46c4e
--- /dev/null
+++ b/arch/arm64/include/asm/efi.h
@@ -0,0 +1,14 @@
+#ifndef _ASM_EFI_H
+#define _ASM_EFI_H
+
+#include <asm/io.h>
+
+#ifdef CONFIG_EFI
+extern void efi_init(void);
+extern void efi_idmap_init(void);
+#else
+#define efi_init()
+#define efi_idmap_init()
+#endif
+
+#endif /* _ASM_EFI_H */
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 0f60b45..4c5a797 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -23,6 +23,7 @@ arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_EFI_STUB) += efi-stub.o efi-entry.o
+arm64-obj-$(CONFIG_EFI) += efi.o
obj-y += $(arm64-obj-y) vdso/
obj-m += $(arm64-obj-m)
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
new file mode 100644
index 0000000..87c4910
--- /dev/null
+++ b/arch/arm64/kernel/efi.c
@@ -0,0 +1,465 @@
+/*
+ * Extensible Firmware Interface
+ *
+ * Based on Extensible Firmware Interface Specification version 2.4
+ *
+ * Copyright (C) 2013 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/efi.h>
+#include <linux/export.h>
+#include <linux/memblock.h>
+#include <linux/bootmem.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include <asm/cacheflush.h>
+#include <asm/efi.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
+
+struct efi_memory_map memmap;
+
+static efi_runtime_services_t *runtime;
+
+static u64 efi_system_table;
+
+static int uefi_debug __initdata;
+static int __init uefi_debug_setup(char *str)
+{
+ uefi_debug = 1;
+
+ return 0;
+}
+early_param("uefi_debug", uefi_debug_setup);
+
+static int __init is_normal_ram(efi_memory_desc_t *md)
+{
+ if (md->attribute & EFI_MEMORY_WB)
+ return 1;
+ return 0;
+}
+
+static void __init efi_setup_idmap(void)
+{
+ struct memblock_region *r;
+ efi_memory_desc_t *md;
+ u64 paddr, npages, size;
+
+ for_each_memblock(memory, r)
+ create_id_mapping(r->base, r->size, 0);
+
+ /* map runtime io spaces */
+ for_each_efi_memory_desc(&memmap, md) {
+ if (!(md->attribute & EFI_MEMORY_RUNTIME) || is_normal_ram(md))
+ continue;
+ paddr = md->phys_addr;
+ npages = md->num_pages;
+ memrange_efi_to_native(&paddr, &npages);
+ size = npages << PAGE_SHIFT;
+ create_id_mapping(paddr, size, 1);
+ }
+}
+
+static int __init uefi_init(void)
+{
+ efi_char16_t *c16;
+ char vendor[100] = "unknown";
+ int i, retval;
+
+ efi.systab = early_memremap(efi_system_table,
+ sizeof(efi_system_table_t));
+ if (efi.systab == NULL) {
+ pr_warn("Unable to map EFI system table.\n");
+ return -ENOMEM;
+ }
+
+ set_bit(EFI_BOOT, &efi.flags);
+ set_bit(EFI_64BIT, &efi.flags);
+
+ /*
+ * Verify the EFI Table
+ */
+ if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
+ pr_err("System table signature incorrect\n");
+ return -EINVAL;
+ }
+ if ((efi.systab->hdr.revision >> 16) < 2)
+ pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
+ efi.systab->hdr.revision >> 16,
+ efi.systab->hdr.revision & 0xffff);
+
+ /* Show what we know for posterity */
+ c16 = early_memremap(efi.systab->fw_vendor,
+ sizeof(vendor));
+ if (c16) {
+ for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
+ vendor[i] = c16[i];
+ vendor[i] = '\0';
+ }
+
+ pr_info("EFI v%u.%.02u by %s\n",
+ efi.systab->hdr.revision >> 16,
+ efi.systab->hdr.revision & 0xffff, vendor);
+
+ retval = efi_config_init(NULL);
+ if (retval == 0)
+ set_bit(EFI_CONFIG_TABLES, &efi.flags);
+
+ early_memunmap(c16, sizeof(vendor));
+ early_memunmap(efi.systab, sizeof(efi_system_table_t));
+
+ return retval;
+}
+
+static __initdata char memory_type_name[][32] = {
+ {"Reserved"},
+ {"Loader Code"},
+ {"Loader Data"},
+ {"Boot Code"},
+ {"Boot Data"},
+ {"Runtime Code"},
+ {"Runtime Data"},
+ {"Conventional Memory"},
+ {"Unusable Memory"},
+ {"ACPI Reclaim Memory"},
+ {"ACPI Memory NVS"},
+ {"Memory Mapped I/O"},
+ {"MMIO Port Space"},
+ {"PAL Code"},
+};
+
+/*
+ * Return true for RAM regions we want to permanently reserve.
+ */
+static __init int is_reserve_region(efi_memory_desc_t *md)
+{
+ if (!is_normal_ram(md))
+ return 0;
+
+ if (md->attribute & EFI_MEMORY_RUNTIME)
+ return 1;
+
+ if (md->type == EFI_ACPI_RECLAIM_MEMORY)
+ return 1;
+
+ return 0;
+}
+
+static __init void reserve_regions(void)
+{
+ efi_memory_desc_t *md;
+ u64 paddr, npages, size;
+
+ if (uefi_debug)
+ pr_info("Processing EFI memory map:\n");
+
+ for_each_efi_memory_desc(&memmap, md) {
+ paddr = md->phys_addr;
+ npages = md->num_pages;
+
+ if (uefi_debug)
+ pr_info(" 0x%012llx-0x%012llx [%s]",
+ paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
+ memory_type_name[md->type]);
+
+ memrange_efi_to_native(&paddr, &npages);
+ size = npages << PAGE_SHIFT;
+
+ if (is_normal_ram(md))
+ early_init_dt_add_memory_arch(paddr, size);
+
+ if (is_reserve_region(md) ||
+ md->type == EFI_BOOT_SERVICES_CODE ||
+ md->type == EFI_BOOT_SERVICES_DATA) {
+ memblock_reserve(paddr, size);
+ if (uefi_debug)
+ pr_cont("*");
+ }
+
+ if (uefi_debug)
+ pr_cont("\n");
+ }
+}
+
+
+static u64 __init free_one_region(u64 start, u64 end)
+{
+ u64 size = end - start;
+
+ if (uefi_debug)
+ pr_info(" EFI freeing: 0x%012llx-0x%012llx\n", start, end - 1);
+
+ free_bootmem_late(start, size);
+ return size;
+}
+
+static u64 __init free_region(u64 start, u64 end)
+{
+ u64 map_start, map_end, total = 0;
+
+ if (end <= start)
+ return total;
+
+ map_start = (u64)memmap.phys_map;
+ map_end = PAGE_ALIGN(map_start + (memmap.map_end - memmap.map));
+ map_start &= PAGE_MASK;
+
+ if (start < map_end && end > map_start) {
+ /* region overlaps UEFI memmap */
+ if (start < map_start)
+ total += free_one_region(start, map_start);
+
+ if (map_end < end)
+ total += free_one_region(map_end, end);
+ } else
+ total += free_one_region(start, end);
+
+ return total;
+}
+
+static void __init free_boot_services(void)
+{
+ u64 total_freed = 0;
+ u64 keep_end, free_start, free_end;
+ efi_memory_desc_t *md;
+
+ /*
+ * If kernel uses larger pages than UEFI, we have to be careful
+ * not to inadvertantly free memory we want to keep if there is
+ * overlap at the kernel page size alignment. We do not want to
+ * free is_reserve_region() memory nor the UEFI memmap itself.
+ *
+ * The memory map is sorted, so we keep track of the end of
+ * any previous region we want to keep, remember any region
+ * we want to free and defer freeing it until we encounter
+ * the next region we want to keep. This way, before freeing
+ * it, we can clip it as needed to avoid freeing memory we
+ * want to keep for UEFI.
+ */
+
+ keep_end = 0;
+ free_start = 0;
+
+ for_each_efi_memory_desc(&memmap, md) {
+ u64 paddr, npages, size;
+
+ if (is_reserve_region(md)) {
+ /*
+ * We don't want to free any memory from this region.
+ */
+ if (free_start) {
+ /* adjust free_end then free region */
+ if (free_end > md->phys_addr)
+ free_end -= PAGE_SIZE;
+ total_freed += free_region(free_start, free_end);
+ free_start = 0;
+ }
+ keep_end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
+ continue;
+ }
+
+ if (md->type != EFI_BOOT_SERVICES_CODE &&
+ md->type != EFI_BOOT_SERVICES_DATA) {
+ /* no need to free this region */
+ continue;
+ }
+
+ /*
+ * We want to free memory from this region.
+ */
+ paddr = md->phys_addr;
+ npages = md->num_pages;
+ memrange_efi_to_native(&paddr, &npages);
+ size = npages << PAGE_SHIFT;
+
+ if (free_start) {
+ if (paddr <= free_end)
+ free_end = paddr + size;
+ else {
+ total_freed += free_region(free_start, free_end);
+ free_start = paddr;
+ free_end = paddr + size;
+ }
+ } else {
+ free_start = paddr;
+ free_end = paddr + size;
+ }
+ if (free_start < keep_end) {
+ free_start += PAGE_SIZE;
+ if (free_start >= free_end)
+ free_start = 0;
+ }
+ }
+ if (free_start)
+ total_freed += free_region(free_start, free_end);
+
+ if (total_freed)
+ pr_info("Freed 0x%llx bytes of EFI boot services memory",
+ total_freed);
+}
+
+void __init efi_init(void)
+{
+ struct efi_fdt_params params;
+
+ /* Grab UEFI information placed in FDT by stub */
+ if (!efi_get_fdt_params(¶ms, uefi_debug))
+ return;
+
+ efi_system_table = params.system_table;
+
+ memblock_reserve(params.mmap & PAGE_MASK,
+ PAGE_ALIGN(params.mmap_size + (params.mmap & ~PAGE_MASK)));
+ memmap.phys_map = (void *)params.mmap;
+ memmap.map = early_memremap(params.mmap, params.mmap_size);
+ memmap.map_end = memmap.map + params.mmap_size;
+ memmap.desc_size = params.desc_size;
+ memmap.desc_version = params.desc_ver;
+
+ if (uefi_init() < 0)
+ return;
+
+ reserve_regions();
+}
+
+void __init efi_idmap_init(void)
+{
+ /* boot time idmap_pg_dir is incomplete, so fill in missing parts */
+ efi_setup_idmap();
+}
+
+static int __init remap_region(efi_memory_desc_t *md, void **new)
+{
+ u64 paddr, vaddr, npages, size;
+
+ paddr = md->phys_addr;
+ npages = md->num_pages;
+ memrange_efi_to_native(&paddr, &npages);
+ size = npages << PAGE_SHIFT;
+
+ if (is_normal_ram(md))
+ vaddr = (__force u64)ioremap_cache(paddr, size);
+ else
+ vaddr = (__force u64)ioremap(paddr, size);
+
+ if (!vaddr) {
+ pr_err("Unable to remap 0x%llx pages @ %p\n",
+ npages, (void *)paddr);
+ return 0;
+ }
+
+ /* adjust for any rounding when EFI and system pagesize differs */
+ md->virt_addr = vaddr + (md->phys_addr - paddr);
+
+ if (uefi_debug)
+ pr_info(" EFI remap 0x%012llx => %p\n",
+ md->phys_addr, (void *)md->virt_addr);
+
+ memcpy(*new, md, memmap.desc_size);
+ *new += memmap.desc_size;
+
+ return 1;
+}
+
+/*
+ * Called from setup_arch with interrupts disabled.
+ */
+void __init efi_enter_virtual_mode(void)
+{
+ efi_memory_desc_t *md;
+ phys_addr_t virtmap_phys;
+ void *virtmap, *virt_md;
+ efi_status_t status;
+ u64 mapsize;
+ int count = 0;
+ unsigned long flags;
+
+ if (!efi_enabled(EFI_BOOT)) {
+ pr_info("EFI services will not be available.\n");
+ return;
+ }
+
+ pr_info("Remapping and enabling EFI services.\n");
+
+ /* replace early memmap mapping with permanent mapping */
+ mapsize = memmap.map_end - memmap.map;
+ early_memunmap(memmap.map, mapsize);
+ memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
+ mapsize);
+ memmap.map_end = memmap.map + mapsize;
+
+ efi.memmap = &memmap;
+
+ /* Map the runtime regions */
+ virtmap = kmalloc(mapsize, GFP_KERNEL);
+ if (!virtmap) {
+ pr_err("Failed to allocate EFI virtual memmap\n");
+ return;
+ }
+ virtmap_phys = virt_to_phys(virtmap);
+ virt_md = virtmap;
+
+ for_each_efi_memory_desc(&memmap, md) {
+ if (!(md->attribute & EFI_MEMORY_RUNTIME))
+ continue;
+ if (remap_region(md, &virt_md))
+ ++count;
+ }
+
+ efi.systab = (__force void *)efi_lookup_mapped_addr(efi_system_table);
+ if (efi.systab)
+ set_bit(EFI_SYSTEM_TABLES, &efi.flags);
+
+ local_irq_save(flags);
+ cpu_switch_mm(idmap_pg_dir, &init_mm);
+ flush_tlb_all();
+ flush_cache_all();
+
+ /* Call SetVirtualAddressMap with the physical address of the map */
+ runtime = efi.systab->runtime;
+ efi.set_virtual_address_map = runtime->set_virtual_address_map;
+
+ status = efi.set_virtual_address_map(count * memmap.desc_size,
+ memmap.desc_size,
+ memmap.desc_version,
+ (efi_memory_desc_t *)virtmap_phys);
+ cpu_set_reserved_ttbr0();
+ flush_tlb_all();
+ flush_cache_all();
+ local_irq_restore(flags);
+
+ kfree(virtmap);
+
+ free_boot_services();
+
+ if (status != EFI_SUCCESS) {
+ pr_err("Failed to set EFI virtual address map! [%lx]\n",
+ status);
+ return;
+ }
+
+ /* Set up runtime services function pointers */
+ runtime = efi.systab->runtime;
+ efi.get_time = runtime->get_time;
+ efi.set_time = runtime->set_time;
+ efi.get_wakeup_time = runtime->get_wakeup_time;
+ efi.set_wakeup_time = runtime->set_wakeup_time;
+ efi.get_variable = runtime->get_variable;
+ efi.get_next_variable = runtime->get_next_variable;
+ efi.set_variable = runtime->set_variable;
+ efi.query_variable_info = runtime->query_variable_info;
+ efi.update_capsule = runtime->update_capsule;
+ efi.query_capsule_caps = runtime->query_capsule_caps;
+ efi.get_next_high_mono_count = runtime->get_next_high_mono_count;
+ efi.reset_system = runtime->reset_system;
+
+ set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+}
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 4d2ac74..17e7e30 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -41,6 +41,7 @@
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
+#include <linux/efi.h>
#include <asm/fixmap.h>
#include <asm/cputype.h>
@@ -55,6 +56,7 @@
#include <asm/traps.h>
#include <asm/memblock.h>
#include <asm/psci.h>
+#include <asm/efi.h>
unsigned int processor_id;
EXPORT_SYMBOL(processor_id);
@@ -333,11 +335,14 @@ void __init setup_arch(char **cmdline_p)
parse_early_param();
+ efi_init();
arm64_memblock_init();
paging_init();
request_standard_resources();
+ efi_idmap_init();
+
unflatten_device_tree();
psci_init();
diff --git a/init/main.c b/init/main.c
index eb03090..7cd57b2 100644
--- a/init/main.c
+++ b/init/main.c
@@ -902,6 +902,10 @@ static noinline void __init kernel_init_freeable(void)
smp_prepare_cpus(setup_max_cpus);
do_pre_smp_initcalls();
+
+ if (IS_ENABLED(CONFIG_ARM64) && efi_enabled(EFI_BOOT))
+ efi_enter_virtual_mode();
+
lockup_detector_init();
smp_init();
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 14/15] doc: arm: add UEFI support documentation
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (11 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 13/15] arm64: add EFI runtime services Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
2014-03-13 22:47 ` [PATCH v2 15/15] efi/arm64: ignore dtb= when UEFI SecureBoot is enabled Leif Lindholm
2014-03-17 22:24 ` [PATCH v2 00/14] UEFI support for arm(64) Matt Fleming
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Leif Lindholm, Rob Landley, linux-doc
This patch provides documentation of the [U]EFI runtime service and
configuration features for the arm architecture.
Cc: Rob Landley <rob@landley.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
---
Documentation/arm/00-INDEX | 2 ++
Documentation/arm/uefi.txt | 64 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 66 insertions(+)
create mode 100644 Documentation/arm/uefi.txt
diff --git a/Documentation/arm/00-INDEX b/Documentation/arm/00-INDEX
index a94090c..3b08bc2 100644
--- a/Documentation/arm/00-INDEX
+++ b/Documentation/arm/00-INDEX
@@ -46,5 +46,7 @@ swp_emulation
- SWP/SWPB emulation handler/logging description
tcm.txt
- ARM Tightly Coupled Memory
+uefi.txt
+ - [U]EFI configuration and runtime services documentation
vlocks.txt
- Voting locks, low-level mechanism relying on memory system atomic writes.
diff --git a/Documentation/arm/uefi.txt b/Documentation/arm/uefi.txt
new file mode 100644
index 0000000..d60030a
--- /dev/null
+++ b/Documentation/arm/uefi.txt
@@ -0,0 +1,64 @@
+UEFI, the Unified Extensible Firmware Interface, is a specification
+governing the behaviours of compatible firmware interfaces. It is
+maintained by the UEFI Forum - http://www.uefi.org/.
+
+UEFI is an evolution of its predecessor 'EFI', so the terms EFI and
+UEFI are used somewhat interchangeably in this document and associated
+source code. As a rule, anything new uses 'UEFI', whereas 'EFI' refers
+to legacy code or specifications.
+
+UEFI support in Linux
+=====================
+Booting on a platform with firmware compliant with the UEFI specification
+makes it possible for the kernel to support additional features:
+- UEFI Runtime Services
+- Retrieving various configuration information through the standardised
+ interface of UEFI configuration tables. (ACPI, SMBIOS, ...)
+
+For actually enabling [U]EFI support, enable:
+- CONFIG_EFI=y
+- CONFIG_EFI_VARS=y or m
+
+The implementation depends on receiving information about the UEFI environment
+in a Flattened Device Tree (FDT) - so is only available with CONFIG_OF.
+
+UEFI stub
+=========
+The "stub" is a feature that extends the Image/zImage into a valid UEFI
+PE/COFF executable, including a loader application that makes it possible to
+load the kernel directly from the UEFI shell, boot menu, or one of the
+lightweight bootloaders like Gummiboot or rEFInd.
+
+The kernel image built with stub support remains a valid kernel image for
+booting in non-UEFI environments.
+
+UEFI kernel support on ARM
+==========================
+UEFI kernel support on the ARM architectures (arm and arm64) is only available
+when boot is performed through the stub.
+
+When booting in UEFI mode, the stub deletes any memory nodes from a provided DT.
+Instead, the kernel reads the UEFI memory map.
+
+The stub populates the FDT /chosen node with (and the kernel scans for) the
+following parameters:
+________________________________________________________________________________
+Name | Size | Description
+================================================================================
+linux,uefi-system-table | 64-bit | Physical address of the UEFI System Table.
+--------------------------------------------------------------------------------
+linux,uefi-mmap-start | 64-bit | Physical address of the UEFI memory map,
+ | | populated by the UEFI GetMemoryMap() call.
+--------------------------------------------------------------------------------
+linux,uefi-mmap-size | 32-bit | Size in bytes of the UEFI memory map
+ | | pointed to in previous entry.
+--------------------------------------------------------------------------------
+linux,uefi-mmap-desc-size | 32-bit | Size in bytes of each entry in the UEFI
+ | | memory map.
+--------------------------------------------------------------------------------
+linux,uefi-mmap-desc-ver | 32-bit | Version of the mmap descriptor format.
+--------------------------------------------------------------------------------
+linux,uefi-stub-kern-ver | string | Copy of linux_banner from build.
+--------------------------------------------------------------------------------
+
+For verbose debug messages, specify 'uefi_debug' on the kernel command line.
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH v2 15/15] efi/arm64: ignore dtb= when UEFI SecureBoot is enabled
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (12 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 14/15] doc: arm: add UEFI support documentation Leif Lindholm
@ 2014-03-13 22:47 ` Leif Lindholm
2014-03-17 22:24 ` [PATCH v2 00/14] UEFI support for arm(64) Matt Fleming
14 siblings, 0 replies; 31+ messages in thread
From: Leif Lindholm @ 2014-03-13 22:47 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming
Cc: msalter, roy.franz, Ard Biesheuvel, Leif Lindholm
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Loading unauthenticated FDT blobs directly from storage is a security hazard,
so this should only be allowed when running with UEFI Secure Boot disabled.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
drivers/firmware/efi/arm-stub.c | 23 ++++++++++++++---------
drivers/firmware/efi/efi-stub-helper.c | 24 ++++++++++++++++++++++++
2 files changed, 38 insertions(+), 9 deletions(-)
diff --git a/drivers/firmware/efi/arm-stub.c b/drivers/firmware/efi/arm-stub.c
index b505fde..733723c 100644
--- a/drivers/firmware/efi/arm-stub.c
+++ b/drivers/firmware/efi/arm-stub.c
@@ -41,7 +41,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
/* addr/point and size pairs for memory management*/
unsigned long initrd_addr;
u64 initrd_size = 0;
- unsigned long fdt_addr; /* Original DTB */
+ unsigned long fdt_addr = 0; /* Original DTB */
u64 fdt_size = 0; /* We don't get size from configuration table */
char *cmdline_ptr = NULL;
int cmdline_size = 0;
@@ -93,15 +93,20 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
goto fail_free_image;
}
- /* Load a device tree from the configuration table, if present. */
- fdt_addr = (uintptr_t)get_fdt(sys_table);
+ /*
+ * Unauthenticated device tree data is a security hazard, so
+ * ignore 'dtb=' unless UEFI Secure Boot is disabled.
+ */
+ if (efi_secureboot_enabled(sys_table))
+ pr_efi(sys_table, "UEFI Secure Boot is enabled.\n");
+ else
+ handle_cmdline_files(sys_table, image, cmdline_ptr, "dtb=",
+ ~0UL, (unsigned long *)&fdt_addr,
+ (unsigned long *)&fdt_size);
if (!fdt_addr) {
- status = handle_cmdline_files(sys_table, image, cmdline_ptr,
- "dtb=",
- ~0UL, (unsigned long *)&fdt_addr,
- (unsigned long *)&fdt_size);
-
- if (status != EFI_SUCCESS) {
+ /* Look for a device tree configuration table entry. */
+ fdt_addr = (uintptr_t)get_fdt(sys_table);
+ if (!fdt_addr) {
pr_efi_err(sys_table, "Failed to load device tree!\n");
goto fail_free_cmdline;
}
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 4a9986b..f2014f2 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -704,3 +704,27 @@ static char *efi_convert_cmdline(efi_system_table_t *sys_table_arg,
*cmd_line_len = options_bytes;
return (char *)cmdline_addr;
}
+
+static int __init efi_secureboot_enabled(efi_system_table_t *sys_table_arg)
+{
+ static efi_guid_t const var_guid __initconst = EFI_GLOBAL_VARIABLE_GUID;
+ static efi_char16_t const var_name[] __initconst = {
+ 'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', 0 };
+
+ efi_get_variable_t *f_getvar = sys_table_arg->runtime->get_variable;
+ unsigned long size = sizeof(u8);
+ efi_status_t status;
+ u8 val;
+
+ status = efi_call_phys5(f_getvar, (efi_char16_t *)var_name,
+ (efi_guid_t *)&var_guid, NULL, &size, &val);
+
+ switch (status) {
+ case EFI_SUCCESS:
+ return val;
+ case EFI_NOT_FOUND:
+ return 0;
+ default:
+ return 1;
+ }
+}
--
1.7.10.4
^ permalink raw reply related [flat|nested] 31+ messages in thread* Re: [PATCH v2 00/14] UEFI support for arm(64)
2014-03-13 22:46 [PATCH v2 00/14] UEFI support for arm(64) Leif Lindholm
` (13 preceding siblings ...)
2014-03-13 22:47 ` [PATCH v2 15/15] efi/arm64: ignore dtb= when UEFI SecureBoot is enabled Leif Lindholm
@ 2014-03-17 22:24 ` Matt Fleming
14 siblings, 0 replies; 31+ messages in thread
From: Matt Fleming @ 2014-03-17 22:24 UTC (permalink / raw)
To: Leif Lindholm
Cc: linux-kernel, linux-arm-kernel, linux-efi, catalin.marinas,
matt.fleming, msalter, roy.franz
On Thu, 13 Mar, at 10:46:53PM, Leif Lindholm wrote:
> Since all prerequisites are not ready for the (32-bit) arm patches to
> go in, I have broken these out of this set and will be resubmitting
> them separately.
>
> This set now provides arm64 support only - but includes the code that
> is common between the ARM ports.
This series looks OK to me.
--
Matt Fleming, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 31+ messages in thread