[PATCH 3/4] x86: add sanitize_e820_map

Yinghai Lu
2010-03-23T08:42:53Z

so we could not take e820.map directly.

and could change e820_saved to initdata

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/include/asm/e820.h | 5 ++---
arch/x86/kernel/e820.c | 26 ++++++++++++++++++--------
arch/x86/kernel/efi.c | 2 +-
arch/x86/kernel/setup.c | 10 +++++-----
arch/x86/xen/setup.c | 4 +---
5 files changed, 27 insertions(+), 20 deletions(-)

diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
index 41553af..01bc987 100644
--- a/arch/x86/include/asm/e820.h
+++ b/arch/x86/include/asm/e820.h
@@ -75,15 +75,14 @@ struct e820map {
#ifdef __KERNEL__
/* see comment in arch/x86/kernel/e820.c */
extern struct e820map e820;
-extern struct e820map e820_saved;

extern unsigned long pci_mem_start;
extern int e820_any_mapped(u64 start, u64 end, unsigned type);
extern int e820_all_mapped(u64 start, u64 end, unsigned type);
extern void e820_add_region(u64 start, u64 size, int type);
extern void e820_print_map(char *who);
-extern int
-sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
+int sanitize_e820_map(void);
+void save_e820_map(void);
extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
unsigned new_type);
extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 05ee724..0c7143b 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -35,7 +35,7 @@
* next kernel with full memory.
*/
struct e820map e820;
-struct e820map e820_saved;
+static struct e820map __initdata e820_saved;

/* For PCI or other memory-mapped resources */
unsigned long pci_mem_start = 0xaeedbabe;
@@ -224,7 +224,7 @@ void __init e820_print_map(char *who)
* ______________________4_
*/

-int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
+static int __init __sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
u32 *pnr_map)
{
struct change_member {
@@ -383,6 +383,11 @@ int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
return 0;
}

+int __init sanitize_e820_map(void)
+{
+ return __sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+}
+
static int __init __append_e820_map(struct e820entry *biosmap, int nr_map)
{
while (nr_map) {
@@ -555,7 +560,7 @@ void __init update_e820(void)
u32 nr_map;

nr_map = e820.nr_map;
- if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))
+ if (__sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))
return;
e820.nr_map = nr_map;
printk(KERN_INFO "modified physical RAM map:\n");
@@ -566,7 +571,7 @@ static void __init update_e820_saved(void)
u32 nr_map;

nr_map = e820_saved.nr_map;
- if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map))
+ if (__sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map))
return;
e820_saved.nr_map = nr_map;
}
@@ -661,7 +666,7 @@ void __init parse_e820_ext(struct setup_data *sdata, unsigned long pa_data)
sdata = early_ioremap(pa_data, map_len);
extmap = (struct e820entry *)(sdata->data);
__append_e820_map(extmap, entries);
- sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ sanitize_e820_map();
if (map_len > PAGE_SIZE)
early_iounmap(sdata, map_len);
printk(KERN_INFO "extended physical RAM map:\n");
@@ -1043,7 +1048,7 @@ void __init finish_e820_parsing(void)
if (userdef) {
u32 nr = e820.nr_map;

- if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0)
+ if (__sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr) < 0)
early_panic("Invalid user supplied memory map");
e820.nr_map = nr;

@@ -1173,7 +1178,7 @@ char *__init default_machine_specific_memory_setup(void)
* the next section from 1mb->appropriate_mem_k
*/
new_nr = boot_params.e820_entries;
- sanitize_e820_map(boot_params.e820_map,
+ __sanitize_e820_map(boot_params.e820_map,
ARRAY_SIZE(boot_params.e820_map),
&new_nr);
boot_params.e820_entries = new_nr;
@@ -1200,12 +1205,17 @@ char *__init default_machine_specific_memory_setup(void)
return who;
}

+void __init save_e820_map(void)
+{
+ memcpy(&e820_saved, &e820, sizeof(struct e820map));
+}
+
void __init setup_memory_map(void)
{
char *who;

who = x86_init.resources.memory_setup();
- memcpy(&e820_saved, &e820, sizeof(struct e820map));
+ save_e820_map();
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
e820_print_map(who);
}
diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c
index c2fa9b8..299f03f 100644
--- a/arch/x86/kernel/efi.c
+++ b/arch/x86/kernel/efi.c
@@ -272,7 +272,7 @@ static void __init do_add_efi_memmap(void)
}
e820_add_region(start, size, e820_type);
}
- sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ sanitize_e820_map();
}

void __init efi_reserve_early(void)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 5d7ba1a..3787a82 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -461,8 +461,8 @@ static void __init e820_reserve_setup_data(void)
if (!found)
return;

- sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
- memcpy(&e820_saved, &e820, sizeof(struct e820map));
+ sanitize_e820_map();
+ save_e820_map();
printk(KERN_INFO "extended physical RAM map:\n");
e820_print_map("reserve setup_data");
}
@@ -614,7 +614,7 @@ static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
d->ident);

e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
- sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ sanitize_e820_map();

return 0;
}
@@ -683,7 +683,7 @@ static void __init trim_bios_range(void)
* take them out.
*/
e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
- sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ sanitize_e820_map();
}

/*
@@ -854,7 +854,7 @@ void __init setup_arch(char **cmdline_p)
if (ppro_with_ram_bug()) {
e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
E820_RESERVED);
- sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ sanitize_e820_map();
printk(KERN_INFO "fixed physical RAM map:\n");
e820_print_map("bad_ppro");
}
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index ad0047f..3f2c411 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -43,8 +43,6 @@ char * __init xen_memory_setup(void)

max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);

- e820.nr_map = 0;
-
e820_add_region(0, PFN_PHYS((u64)max_pfn), E820_RAM);

/*
@@ -65,7 +63,7 @@ char * __init xen_memory_setup(void)
__pa(xen_start_info->pt_base),
"XEN START INFO");

- sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ sanitize_e820_map();

return "Xen";
}
--
1.6.4.2