[PATCH 6/6] kexec, x86_64: put 64bit bzImage high

Yinghai Lu
2012-11-19T03:02:45Z

need to make sure pass right 64bit start address to go there directly later.

-v2: add kexec-bzImage64.c according to Eric.
-v3: don't need to purgatory under 2g after Eric's change to purgatory code.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
kexec/arch/x86_64/Makefile | 1 +
kexec/arch/x86_64/kexec-bzImage64.c | 316 +++++++++++++++++++++++++++++++++++
kexec/arch/x86_64/kexec-x86_64.c | 1 +
kexec/arch/x86_64/kexec-x86_64.h | 5 +
4 files changed, 323 insertions(+), 0 deletions(-)
create mode 100644 kexec/arch/x86_64/kexec-bzImage64.c

diff --git a/kexec/arch/x86_64/Makefile b/kexec/arch/x86_64/Makefile
index 405bdf5..1cf10f9 100644
--- a/kexec/arch/x86_64/Makefile
+++ b/kexec/arch/x86_64/Makefile
@@ -13,6 +13,7 @@ x86_64_KEXEC_SRCS += kexec/arch/i386/crashdump-x86.c
x86_64_KEXEC_SRCS_native = kexec/arch/x86_64/kexec-x86_64.c
x86_64_KEXEC_SRCS_native += kexec/arch/x86_64/kexec-elf-x86_64.c
x86_64_KEXEC_SRCS_native += kexec/arch/x86_64/kexec-elf-rel-x86_64.c
+x86_64_KEXEC_SRCS_native += kexec/arch/x86_64/kexec-bzImage64.c

x86_64_KEXEC_SRCS += $(x86_64_KEXEC_SRCS_native)

diff --git a/kexec/arch/x86_64/kexec-bzImage64.c b/kexec/arch/x86_64/kexec-bzImage64.c
new file mode 100644
index 0000000..6835ef6
--- /dev/null
+++ b/kexec/arch/x86_64/kexec-bzImage64.c
@@ -0,0 +1,316 @@
+/*
+ * kexec: Linux boots Linux
+ *
+ * Copyright (C) 2003-2010 Eric Biederman (ebiederm@xmission.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation (version 2 of the License).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define _GNU_SOURCE
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <elf.h>
+#include <boot/elf_boot.h>
+#include <ip_checksum.h>
+#include <x86/x86-linux.h>
+#include "../../kexec.h"
+#include "../../kexec-elf.h"
+#include "../../kexec-syscall.h"
+#include "kexec-x86_64.h"
+#include "../i386/x86-linux-setup.h"
+#include "../i386/crashdump-x86.h"
+#include <arch/options.h>
+
+static const int probe_debug = 0;
+
+int bzImage64_probe(const char *buf, off_t len)
+{
+ const struct x86_linux_header *header;
+ if ((uintmax_t)len < (uintmax_t)(2 * 512)) {
+ if (probe_debug) {
+ fprintf(stderr, "File is too short to be a bzImage!\n");
+ }
+ return -1;
+ }
+ header = (const struct x86_linux_header *)buf;
+ if (memcmp(header->header_magic, "HdrS", 4) != 0) {
+ if (probe_debug) {
+ fprintf(stderr, "Not a bzImage\n");
+ }
+ return -1;
+ }
+ if (header->boot_sector_magic != 0xAA55) {
+ if (probe_debug) {
+ fprintf(stderr, "No x86 boot sector present\n");
+ }
+ /* No x86 boot sector present */
+ return -1;
+ }
+ if (header->protocol_version < 0x020C) {
+ if (probe_debug) {
+ fprintf(stderr, "Must be at least protocol version 2.12\n");
+ }
+ /* Must be at least protocol version 2.12 */
+ return -1;
+ }
+ if ((header->loadflags & 1) == 0) {
+ if (probe_debug) {
+ fprintf(stderr, "zImage not a bzImage\n");
+ }
+ /* Not a bzImage */
+ return -1;
+ }
+ if (!header->code64_start_offset) {
+ if (probe_debug) {
+ fprintf(stderr, "Not a bzImage64\n");
+ }
+ /* Must have non zero offset */
+ return -1;
+ }
+ if (!header->relocatable_kernel) {
+ if (probe_debug) {
+ fprintf(stderr, "Not a relocatable bzImage64\n");
+ }
+ /* Must be relocatable */
+ return -1;
+ }
+ /* I've got a bzImage64 */
+ if (probe_debug) {
+ fprintf(stderr, "It's a relocatable bzImage64\n");
+ }
+ return 0;
+}
+
+void bzImage64_usage(void)
+{
+ printf( " --command-line=STRING Set the kernel command line to STRING.\n"
+ " --append=STRING Set the kernel command line to STRING.\n"
+ " --reuse-cmdline Use kernel command line from running system.\n"
+ " --initrd=FILE Use FILE as the kernel's initial ramdisk.\n"
+ " --ramdisk=FILE Use FILE as the kernel's initial ramdisk.\n"
+ );
+}
+
+static int do_bzImage64_load(struct kexec_info *info,
+ const char *kernel, off_t kernel_len,
+ const char *command_line, off_t command_line_len,
+ const char *initrd, off_t initrd_len)
+{
+ struct x86_linux_header setup_header;
+ struct x86_linux_param_header *real_mode;
+ int setup_sects;
+ size_t size;
+ int kern16_size;
+ unsigned long setup_base, setup_size;
+ struct entry64_regs regs64;
+ char *modified_cmdline;
+ unsigned long cmdline_end;
+ unsigned long code64_start_offset = 0;
+ unsigned long kernel64_load_addr = 0;
+
+ /*
+ * Find out about the file I am about to load.
+ */
+ if ((uintmax_t)kernel_len < (uintmax_t)(2 * 512))
+ return -1;
+
+ memcpy(&setup_header, kernel, sizeof(setup_header));
+ setup_sects = setup_header.setup_sects;
+ if (setup_sects == 0)
+ setup_sects = 4;
+
+ kern16_size = (setup_sects +1) *512;
+ if (kernel_len < kern16_size) {
+ fprintf(stderr, "BzImage truncated?\n");
+ return -1;
+ }
+
+ if ((uintmax_t)command_line_len > (uintmax_t)setup_header.cmdline_size) {
+ dbgprintf("Kernel command line too long for kernel!\n");
+ return -1;
+ }
+
+ dbgprintf("bzImage is relocatable\n");
+
+ code64_start_offset = setup_header.code64_start_offset;
+ dbgprintf("code64_start_offset: 0x%lx\n", code64_start_offset);
+
+ /* Need to append some command line parameters internally in case of
+ * taking crash dumps.
+ */
+ if (info->kexec_flags & (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)) {
+ modified_cmdline = xmalloc(COMMAND_LINE_SIZE);
+ memset((void *)modified_cmdline, 0, COMMAND_LINE_SIZE);
+ if (command_line) {
+ strncpy(modified_cmdline, command_line,
+ COMMAND_LINE_SIZE);
+ modified_cmdline[COMMAND_LINE_SIZE - 1] = '\0';
+ }
+
+ /* If panic kernel is being loaded, additional segments need
+ * to be created. load_crashdump_segments will take care of
+ * loading the segments as high in memory as possible, hence
+ * in turn as away as possible from kernel to avoid being
+ * stomped by the kernel.
+ */
+ if (load_crashdump_segments(info, modified_cmdline, -1, 0) < 0)
+ return -1;
+
+ /* Use new command line buffer */
+ command_line = modified_cmdline;
+ command_line_len = strlen(command_line) +1;
+ }
+
+ /* x86_64 purgatory could be anywhere */
+ elf_rel_build_load(info, &info->rhdr, purgatory, purgatory_size,
+ 0x3000, -1, -1, 0);
+ dbgprintf("Loaded purgatory at addr 0x%lx\n", info->rhdr.rel_addr);
+ /* The argument/parameter segment */
+ setup_size = kern16_size + command_line_len + PURGATORY_CMDLINE_SIZE;
+ real_mode = xmalloc(setup_size);
+ memcpy(real_mode, kernel, kern16_size);
+
+ /* No real mode code will be executing. setup segment can be loaded
+ * anywhere as we will be just reading command line.
+ */
+ setup_base = add_buffer(info, real_mode, setup_size, setup_size,
+ 16, 0x3000, -1, -1);
+
+ dbgprintf("Loaded setup data and command line at 0x%lx\n",
+ setup_base);
+
+ /* The main kernel segment */
+ size = kernel_len - kern16_size;
+
+ /* align to 1G to avoid cross the PUD_SIZE boundary */
+ /* try above 4G at first */
+ kernel64_load_addr = add_buffer(info, kernel + kern16_size,
+ size, size, 1UL<<30,
+ 1UL<<32, ULONG_MAX,
+ -1);
+
+ /* 1G to 4G */
+ if (!kernel64_load_addr)
+ kernel64_load_addr = add_buffer(info, kernel + kern16_size,
+ size, size, 1UL<<30,
+ 1UL<<30, 1UL<<32,
+ -1);
+
+ /* under 1g */
+ if (!kernel64_load_addr)
+ kernel64_load_addr = add_buffer(info, kernel + kern16_size,
+ size, size,
+ real_mode->kernel_alignment,
+ 0x100000, 1UL<<30,
+ 1);
+ if (kernel64_load_addr)
+ dbgprintf("Loaded 64bit kernel at 0x%lx\n", kernel64_load_addr);
+ else
+ die("can not load bzImage64");
+
+ /* Tell the kernel what is going on */
+ setup_linux_bootloader_parameters(info, real_mode, setup_base,
+ kern16_size, command_line, command_line_len,
+ initrd, initrd_len);
+
+ elf_rel_get_symbol(&info->rhdr, "entry64_regs", &regs64, sizeof(regs64));
+ regs64.rbx = 0; /* Bootstrap processor */
+ regs64.rsi = setup_base; /* Pointer to the parameters */
+ regs64.rip = kernel64_load_addr + code64_start_offset; /* the entry point */
+ regs64.rsp = elf_rel_get_addr(&info->rhdr, "stack_end"); /* Stack, unused */
+ elf_rel_set_symbol(&info->rhdr, "entry64_regs", &regs64, sizeof(regs64));
+
+ cmdline_end = setup_base + kern16_size + command_line_len - 1;
+ elf_rel_set_symbol(&info->rhdr, "cmdline_end", &cmdline_end,
+ sizeof(unsigned long));
+
+ /* Fill in the information BIOS calls would normally provide. */
+ setup_linux_system_parameters(real_mode, info->kexec_flags);
+
+ return 0;
+}
+
+int bzImage64_load(int argc, char **argv, const char *buf, off_t len,
+ struct kexec_info *info)
+{
+ char *command_line = NULL;
+ const char *ramdisk, *append = NULL;
+ char *ramdisk_buf;
+ off_t ramdisk_length;
+ int command_line_len;
+ int opt;
+ int result;
+
+ /* See options.h -- add any more there, too. */
+ static const struct option options[] = {
+ KEXEC_ARCH_OPTIONS
+ { "command-line", 1, 0, OPT_APPEND },
+ { "append", 1, 0, OPT_APPEND },
+ { "reuse-cmdline", 0, 0, OPT_REUSE_CMDLINE },
+ { "initrd", 1, 0, OPT_RAMDISK },
+ { "ramdisk", 1, 0, OPT_RAMDISK },
+ { 0, 0, 0, 0 },
+ };
+ static const char short_options[] = KEXEC_ARCH_OPT_STR "d";
+
+ ramdisk = 0;
+ ramdisk_length = 0;
+ while((opt = getopt_long(argc, argv, short_options, options, 0)) != -1) {
+ switch(opt) {
+ default:
+ /* Ignore core options */
+ if (opt < OPT_ARCH_MAX) {
+ break;
+ }
+ case '?':
+ usage();
+ return -1;
+ break;
+ case OPT_APPEND:
+ append = optarg;
+ break;
+ case OPT_REUSE_CMDLINE:
+ command_line = get_command_line();
+ break;
+ case OPT_RAMDISK:
+ ramdisk = optarg;
+ break;
+ }
+ }
+ command_line = concat_cmdline(command_line, append);
+ command_line_len = 0;
+ if (command_line) {
+ command_line_len = strlen(command_line) +1;
+ }
+ ramdisk_buf = 0;
+ if (ramdisk) {
+ ramdisk_buf = slurp_file(ramdisk, &ramdisk_length);
+ }
+ result = do_bzImage64_load(info,
+ buf, len,
+ command_line, command_line_len,
+ ramdisk_buf, ramdisk_length);
+
+ free(command_line);
+ return result;
+}
diff --git a/kexec/arch/x86_64/kexec-x86_64.c b/kexec/arch/x86_64/kexec-x86_64.c
index 6c42c32..5c23e01 100644
--- a/kexec/arch/x86_64/kexec-x86_64.c
+++ b/kexec/arch/x86_64/kexec-x86_64.c
@@ -37,6 +37,7 @@ struct file_type file_type[] = {
{ "multiboot-x86", multiboot_x86_probe, multiboot_x86_load,
multiboot_x86_usage },
{ "elf-x86", elf_x86_probe, elf_x86_load, elf_x86_usage },
+ { "bzImage64", bzImage64_probe, bzImage64_load, bzImage64_usage },
{ "bzImage", bzImage_probe, bzImage_load, bzImage_usage },
{ "beoboot-x86", beoboot_probe, beoboot_load, beoboot_usage },
{ "nbi-x86", nbi_probe, nbi_load, nbi_usage },
diff --git a/kexec/arch/x86_64/kexec-x86_64.h b/kexec/arch/x86_64/kexec-x86_64.h
index a97cd71..b820ae8 100644
--- a/kexec/arch/x86_64/kexec-x86_64.h
+++ b/kexec/arch/x86_64/kexec-x86_64.h
@@ -28,4 +28,9 @@ int elf_x86_64_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info);
void elf_x86_64_usage(void);

+int bzImage64_probe(const char *buf, off_t len);
+int bzImage64_load(int argc, char **argv, const char *buf, off_t len,
+ struct kexec_info *info);
+void bzImage64_usage(void);
+
#endif /* KEXEC_X86_64_H */
--
1.7.7