[RFC][PATCH 1/3] Kdump: Backup Region Handling
From: Vivek Goyal (vgoyal_at_in.ibm.com)
Date: 02/24/05
- Previous message: Vivek Goyal: "[RFC][PATCH 0/3] Kdump: Overview"
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To: "Eric W. Biederman" <ebiederm@xmission.com> Date: 24 Feb 2005 21:47:11 +0530
This patch adds support for reserving space for backup region. Also adds code
in purgatory to copy the first 640K to backup region.
---
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
---
diff -puN /dev/null kexec/arch/i386/crashdump-x86.h
--- /dev/null 2004-06-16 19:10:55.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/crashdump-x86.h 2005-02-24 18:55:46.000000000 +0530
@@ -0,0 +1,9 @@
+#ifndef CRASHDUMP_X86_H
+#define CRASHDUMP_X86_H
+
+/* Backup Region, First 640K of System RAM. */
+#define BACKUP_START 0x00000000
+#define BACKUP_END 0x0009ffff
+#define BACKUP_SIZE (BACKUP_END - BACKUP_START + 1)
+
+#endif /* CRASHDUMP_X86_H */
diff -puN kexec/arch/i386/kexec-beoboot-x86.c~kexec-tools-crashdump-backup-x86 kexec/arch/i386/kexec-beoboot-x86.c
--- kexec-tools-1.101/kexec/arch/i386/kexec-beoboot-x86.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/kexec-beoboot-x86.c 2005-02-24 18:55:46.000000000 +0530
@@ -76,7 +76,7 @@ void beoboot_usage(void)
#define INITRD_BASE 0x1000000 /* 16MB */
int beoboot_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
struct beoboot_header bb_header;
const unsigned char *command_line, *kernel, *initrd;
diff -puN kexec/arch/i386/kexec-bzImage.c~kexec-tools-crashdump-backup-x86 kexec/arch/i386/kexec-bzImage.c
--- kexec-tools-1.101/kexec/arch/i386/kexec-bzImage.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/kexec-bzImage.c 2005-02-24 18:55:46.000000000 +0530
@@ -221,7 +221,7 @@ int do_bzImage_load(struct kexec_info *i
}
int bzImage_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
const char *command_line;
const char *ramdisk;
diff -puN kexec/arch/i386/kexec-elf-x86.c~kexec-tools-crashdump-backup-x86 kexec/arch/i386/kexec-elf-x86.c
--- kexec-tools-1.101/kexec/arch/i386/kexec-elf-x86.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/kexec-elf-x86.c 2005-02-24 18:55:46.000000000 +0530
@@ -32,10 +32,12 @@
#include <elf.h>
#include <x86/x86-linux.h>
#include "../../kexec.h"
+#include "../../kexec-syscall.h"
#include "../../kexec-elf.h"
#include "../../kexec-elf-boot.h"
#include "x86-linux-setup.h"
#include "kexec-x86.h"
+#include "crashdump-x86.h"
#include <arch/options.h>
static const int probe_debug = 0;
@@ -82,7 +84,7 @@ void elf_x86_usage(void)
}
int elf_x86_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
struct mem_ehdr ehdr;
const char *command_line;
@@ -221,6 +223,21 @@ int elf_x86_load(int argc, char **argv,
ramdisk_buf = slurp_file(ramdisk, &ramdisk_length);
}
+ /* If panic kernel is being loaded, additional segments need
+ * to be created. */
+ if (kexec_flags & KEXEC_ON_CRASH) {
+ void *tmp;
+ unsigned long sz;
+ int nr_ranges, align = 1024;
+ /* Create a backup region segment to store first 638K
+ * memory*/
+ sz = (BACKUP_SIZE + align - 1) & ~(align - 1);
+ tmp = xmalloc(sz);
+ memset(tmp, 0, sz);
+ info->backup_start = add_buffer(info, tmp, sz, sz, 1024,
+ 0, max_addr, 1);
+ }
+
/* Tell the kernel what is going on */
setup_linux_bootloader_parameters(info, &hdr->hdr, param_base,
offsetof(struct x86_linux_faked_param_header, command_line),
diff -puN kexec/arch/i386/kexec-multiboot-x86.c~kexec-tools-crashdump-backup-x86 kexec/arch/i386/kexec-multiboot-x86.c
--- kexec-tools-1.101/kexec/arch/i386/kexec-multiboot-x86.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/kexec-multiboot-x86.c 2005-02-24 18:55:46.000000000 +0530
@@ -138,7 +138,7 @@ void multiboot_x86_usage(void)
}
int multiboot_x86_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
/* Marshal up a multiboot-style kernel */
{
struct multiboot_info *mbi;
@@ -246,7 +246,7 @@ int multiboot_x86_load(int argc, char **
mbi->boot_loader_name = sizeof(*mbi) + command_line_len;
/* Memory map */
- if ((get_memory_ranges(&range, &ranges) < 0) || ranges == 0) {
+ if ((get_memory_ranges(&range, &ranges, kexec_flags) < 0) || ranges == 0) {
fprintf(stderr, "Cannot get memory information\n");
return -1;
}
diff -puN kexec/arch/i386/kexec-x86.c~kexec-tools-crashdump-backup-x86 kexec/arch/i386/kexec-x86.c
--- kexec-tools-1.101/kexec/arch/i386/kexec-x86.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/kexec-x86.c 2005-02-24 18:55:46.000000000 +0530
@@ -37,7 +37,8 @@
static struct memory_range memory_range[MAX_MEMORY_RANGES];
/* Return a sorted list of memory ranges. */
-int get_memory_ranges(struct memory_range **range, int *ranges)
+int get_memory_ranges(struct memory_range **range, int *ranges,
+ unsigned long kexec_flags)
{
const char iomem[]= "/proc/iomem";
int memory_ranges = 0;
@@ -79,6 +80,20 @@ int get_memory_ranges(struct memory_rang
else if (memcmp(str, "ACPI Non-volatile Storage\n", 26) == 0) {
type = RANGE_ACPI_NVS;
}
+ else if (memcmp(str, "Crash kernel\n", 13) == 0) {
+ /* Redefine the memory region boundaries if kernel
+ * exports the limits and if it is panic kernel.
+ * Override user values only if kernel exported values are
+ * subset of user defined values.
+ */
+ if (kexec_flags & KEXEC_ON_CRASH) {
+ if (start > mem_min)
+ mem_min = start;
+ if (end < mem_max)
+ mem_max = end;
+ }
+ continue;
+ }
else {
continue;
}
@@ -247,8 +262,10 @@ int arch_compat_trampoline(struct kexec_
return 0;
}
-void arch_update_purgatory(struct kexec_info *info)
+void arch_update_purgatory(struct kexec_info *info, unsigned long kexec_flags)
{
+ uint8_t panic_kernel = 0;
+
elf_rel_set_symbol(&info->rhdr, "reset_vga",
&arch_options.reset_vga, sizeof(arch_options.reset_vga));
elf_rel_set_symbol(&info->rhdr, "serial_base",
@@ -259,4 +276,11 @@ void arch_update_purgatory(struct kexec_
&arch_options.console_vga, sizeof(arch_options.console_vga));
elf_rel_set_symbol(&info->rhdr, "console_serial",
&arch_options.console_serial, sizeof(arch_options.console_serial));
+ if (kexec_flags & KEXEC_ON_CRASH) {
+ panic_kernel = 1;
+ elf_rel_set_symbol(&info->rhdr, "backup_start",
+ &info->backup_start, sizeof(info->backup_start));
+ }
+ elf_rel_set_symbol(&info->rhdr, "panic_kernel",
+ &panic_kernel, sizeof(panic_kernel));
}
diff -puN kexec/arch/i386/kexec-x86.h~kexec-tools-crashdump-backup-x86 kexec/arch/i386/kexec-x86.h
--- kexec-tools-1.101/kexec/arch/i386/kexec-x86.h~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/kexec-x86.h 2005-02-24 18:55:46.000000000 +0530
@@ -37,17 +37,17 @@ struct entry16_regs {
int multiboot_x86_probe(const char *buf, off_t len);
int multiboot_x86_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void multiboot_x86_usage(void);
int elf_x86_probe(const char *buf, off_t len);
int elf_x86_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void elf_x86_usage(void);
int bzImage_probe(const char *buf, off_t len);
int bzImage_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void bzImage_usage(void);
int do_bzImage_load(struct kexec_info *info,
const char *kernel, off_t kernel_len,
@@ -57,7 +57,7 @@ int do_bzImage_load(struct kexec_info *i
int beoboot_probe(const char *buf, off_t len);
int beoboot_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void beoboot_usage(void);
int nbi_probe(const char *buf, off_t len);
diff -puN kexec/arch/i386/x86-linux-setup.c~kexec-tools-crashdump-backup-x86 kexec/arch/i386/x86-linux-setup.c
--- kexec-tools-1.101/kexec/arch/i386/x86-linux-setup.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/i386/x86-linux-setup.c 2005-02-24 18:55:46.000000000 +0530
@@ -99,6 +99,7 @@ void setup_linux_system_parameters(struc
/* Fill in information the BIOS would usually provide */
struct memory_range *range;
int i, ranges;
+ unsigned long kexec_flags = 0;
/* Default screen size */
real_mode->orig_x = 0;
@@ -135,7 +136,7 @@ void setup_linux_system_parameters(struc
real_mode->aux_device_info = 0;
/* Fill in the memory info */
- if ((get_memory_ranges(&range, &ranges) < 0) || ranges == 0) {
+ if ((get_memory_ranges(&range, &ranges, kexec_flags) < 0) || ranges == 0) {
die("Cannot get memory information\n");
}
if (ranges > E820MAX) {
diff -puN kexec/arch/ia64/kexec-elf-ia64.c~kexec-tools-crashdump-backup-x86 kexec/arch/ia64/kexec-elf-ia64.c
--- kexec-tools-1.101/kexec/arch/ia64/kexec-elf-ia64.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ia64/kexec-elf-ia64.c 2005-02-24 18:55:46.000000000 +0530
@@ -78,7 +78,7 @@ void elf_ia64_usage(void)
}
int elf_ia64_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
struct mem_ehdr ehdr;
const char *command_line;
diff -puN kexec/arch/ia64/kexec-ia64.c~kexec-tools-crashdump-backup-x86 kexec/arch/ia64/kexec-ia64.c
--- kexec-tools-1.101/kexec/arch/ia64/kexec-ia64.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ia64/kexec-ia64.c 2005-02-24 18:55:46.000000000 +0530
@@ -38,7 +38,8 @@
static struct memory_range memory_range[MAX_MEMORY_RANGES];
/* Return a sorted list of available memory ranges. */
-int get_memory_ranges(struct memory_range **range, int *ranges)
+int get_memory_ranges(struct memory_range **range, int *ranges,
+ unsigned long kexec_flags)
{
int memory_ranges;
/*
@@ -150,7 +151,7 @@ int arch_compat_trampoline(struct kexec_
return 0;
}
-void arch_update_purgatory(struct kexec_info *info)
+void arch_update_purgatory(struct kexec_info *info, unsigned long kexec_flags)
{
}
diff -puN kexec/arch/ia64/kexec-ia64.h~kexec-tools-crashdump-backup-x86 kexec/arch/ia64/kexec-ia64.h
--- kexec-tools-1.101/kexec/arch/ia64/kexec-ia64.h~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ia64/kexec-ia64.h 2005-02-24 18:55:46.000000000 +0530
@@ -3,7 +3,7 @@
int elf_ia64_probe(const char *buf, off_t len);
int elf_ia64_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void elf_ia64_usage(void);
#endif /* KEXEC_IA64_H */
diff -puN kexec/arch/ppc/kexec-dol-ppc.c~kexec-tools-crashdump-backup-x86 kexec/arch/ppc/kexec-dol-ppc.c
--- kexec-tools-1.101/kexec/arch/ppc/kexec-dol-ppc.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ppc/kexec-dol-ppc.c 2005-02-24 18:55:46.000000000 +0530
@@ -320,7 +320,7 @@ void dol_ppc_usage(void)
}
int dol_ppc_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
dol_header header, *h;
unsigned long entry;
diff -puN kexec/arch/ppc/kexec-elf-ppc.c~kexec-tools-crashdump-backup-x86 kexec/arch/ppc/kexec-elf-ppc.c
--- kexec-tools-1.101/kexec/arch/ppc/kexec-elf-ppc.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ppc/kexec-elf-ppc.c 2005-02-24 18:55:46.000000000 +0530
@@ -124,7 +124,7 @@ static void gamecube_hack_addresses(stru
}
int elf_ppc_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
struct mem_ehdr ehdr;
char *arg_buf;
diff -puN kexec/arch/ppc/kexec-ppc.c~kexec-tools-crashdump-backup-x86 kexec/arch/ppc/kexec-ppc.c
--- kexec-tools-1.101/kexec/arch/ppc/kexec-ppc.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ppc/kexec-ppc.c 2005-02-24 18:55:46.000000000 +0530
@@ -23,7 +23,8 @@
static struct memory_range memory_range[MAX_MEMORY_RANGES];
/* Return a sorted list of memory ranges. */
-int get_memory_ranges(struct memory_range **range, int *ranges)
+int get_memory_ranges(struct memory_range **range, int *ranges,
+ unsigned long kexec_flags)
{
int memory_ranges = 0;
#ifdef CONFIG_GAMECUBE
@@ -145,7 +146,7 @@ int arch_compat_trampoline(struct kexec_
return 0;
}
-void arch_update_purgatory(struct kexec_info *info)
+void arch_update_purgatory(struct kexec_info *info, unsigned long kexec_flags)
{
}
diff -puN kexec/arch/ppc/kexec-ppc.h~kexec-tools-crashdump-backup-x86 kexec/arch/ppc/kexec-ppc.h
--- kexec-tools-1.101/kexec/arch/ppc/kexec-ppc.h~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ppc/kexec-ppc.h 2005-02-24 18:55:46.000000000 +0530
@@ -17,12 +17,12 @@ extern struct {
int elf_ppc_probe(const char *buf, off_t len);
int elf_ppc_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void elf_ppc_usage(void);
int dol_ppc_probe(const char *buf, off_t len);
int dol_ppc_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void dol_ppc_usage(void);
#endif /* KEXEC_PPC_H */
diff -puN kexec/arch/ppc64/kexec-elf-ppc64.c~kexec-tools-crashdump-backup-x86 kexec/arch/ppc64/kexec-elf-ppc64.c
--- kexec-tools-1.101/kexec/arch/ppc64/kexec-elf-ppc64.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ppc64/kexec-elf-ppc64.c 2005-02-24 18:55:46.000000000 +0530
@@ -95,7 +95,7 @@ int elf_ppc64_probe(const char *buf, off
}
int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
struct mem_ehdr ehdr;
diff -puN kexec/arch/ppc64/kexec-ppc64.h~kexec-tools-crashdump-backup-x86 kexec/arch/ppc64/kexec-ppc64.h
--- kexec-tools-1.101/kexec/arch/ppc64/kexec-ppc64.h~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/ppc64/kexec-ppc64.h 2005-02-24 18:55:46.000000000 +0530
@@ -3,7 +3,7 @@
int elf_ppc64_probe(const char *buf, off_t len);
int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void elf_ppc64_usage(void);
#endif /* KEXEC_PPC_H */
diff -puN kexec/arch/x86_64/kexec-elf-x86_64.c~kexec-tools-crashdump-backup-x86 kexec/arch/x86_64/kexec-elf-x86_64.c
--- kexec-tools-1.101/kexec/arch/x86_64/kexec-elf-x86_64.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/x86_64/kexec-elf-x86_64.c 2005-02-24 18:55:46.000000000 +0530
@@ -81,7 +81,7 @@ void elf_x86_64_usage(void)
}
int elf_x86_64_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info)
+ struct kexec_info *info, unsigned long kexec_flags)
{
struct mem_ehdr ehdr;
const char *command_line;
diff -puN kexec/arch/x86_64/kexec-x86_64.c~kexec-tools-crashdump-backup-x86 kexec/arch/x86_64/kexec-x86_64.c
--- kexec-tools-1.101/kexec/arch/x86_64/kexec-x86_64.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/x86_64/kexec-x86_64.c 2005-02-24 18:55:46.000000000 +0530
@@ -37,7 +37,8 @@
static struct memory_range memory_range[MAX_MEMORY_RANGES];
/* Return a sorted list of memory ranges. */
-int get_memory_ranges(struct memory_range **range, int *ranges)
+int get_memory_ranges(struct memory_range **range, int *ranges,
+ unsigned long kexec_flags)
{
const char iomem[]= "/proc/iomem";
int memory_ranges = 0;
@@ -232,7 +233,7 @@ int arch_compat_trampoline(struct kexec_
return 0;
}
-void arch_update_purgatory(struct kexec_info *info)
+void arch_update_purgatory(struct kexec_info *info, unsigned long kexec_flags)
{
elf_rel_set_symbol(&info->rhdr, "reset_vga",
&arch_options.reset_vga, sizeof(arch_options.reset_vga));
diff -puN kexec/arch/x86_64/kexec-x86_64.h~kexec-tools-crashdump-backup-x86 kexec/arch/x86_64/kexec-x86_64.h
--- kexec-tools-1.101/kexec/arch/x86_64/kexec-x86_64.h~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/arch/x86_64/kexec-x86_64.h 2005-02-24 18:55:46.000000000 +0530
@@ -25,7 +25,7 @@ struct entry64_regs {
int elf_x86_64_probe(const char *buf, off_t len);
int elf_x86_64_load(int argc, char **argv, const char *buf, off_t len,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
void elf_x86_64_usage(void);
#endif /* KEXEC_X86_64_H */
diff -puN kexec/kexec.c~kexec-tools-crashdump-backup-x86 kexec/kexec.c
--- kexec-tools-1.101/kexec/kexec.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/kexec.c 2005-02-24 18:55:46.000000000 +0530
@@ -38,8 +38,8 @@
#include "kexec-elf.h"
#include "kexec-sha256.h"
-static unsigned long long mem_min = 0;
-static unsigned long long mem_max = ULONG_MAX;
+unsigned long long mem_min = 0;
+unsigned long long mem_max = ULONG_MAX;
void die(char *fmt, ...)
{
@@ -445,7 +445,7 @@ char *slurp_decompress_file(const char *
}
#endif
-static void update_purgatory(struct kexec_info *info)
+static void update_purgatory(struct kexec_info *info, unsigned long kexec_flags)
{
static const uint8_t null_buf[256];
sha256_context ctx;
@@ -456,7 +456,7 @@ static void update_purgatory(struct kexe
if (!info->rhdr.e_shdr) {
return;
}
- arch_update_purgatory(info);
+ arch_update_purgatory(info, kexec_flags);
memset(region, 0, sizeof(region));
sha256_starts(&ctx);
/* Compute a hash of the loaded kernel */
@@ -470,6 +470,10 @@ static void update_purgatory(struct kexe
if (info->segment[i].mem == (void *)info->rhdr.rel_addr) {
continue;
}
+ /* Don't include backup region in the checksum */
+ if (info->segment[i].mem == (void *)info->backup_start) {
+ continue;
+ }
sha256_update(&ctx, info->segment[i].buf, info->segment[i].bufsz);
nullsz = info->segment[i].memsz - info->segment[i].bufsz;
while(nullsz) {
@@ -507,6 +511,7 @@ static int my_load(const char *type, int
info.segment = NULL;
info.nr_segments = 0;
info.entry = NULL;
+ info.backup_start = 0;
result = 0;
if (argc - fileind <= 0) {
@@ -522,7 +527,7 @@ static int my_load(const char *type, int
kernel_buf, kernel_size);
#endif
- if (get_memory_ranges(&memory_range, &memory_ranges) < 0) {
+ if (get_memory_ranges(&memory_range, &memory_ranges, kexec_flags) < 0) {
fprintf(stderr, "Could not get memory layout\n");
return -1;
}
@@ -559,7 +564,8 @@ static int my_load(const char *type, int
}
}
}
- if (file_type[i].load(argc, argv, kernel_buf, kernel_size, &info) < 0) {
+ if (file_type[i].load(argc, argv, kernel_buf, kernel_size, &info,
+ kexec_flags) < 0) {
fprintf(stderr, "Cannot load %s\n", kernel);
return -1;
}
@@ -582,7 +588,7 @@ static int my_load(const char *type, int
return -1;
}
/* if purgatory is loaded update it */
- update_purgatory(&info);
+ update_purgatory(&info, kexec_flags);
#if 0
fprintf(stderr, "kexec_load: entry = %p flags = %lx\n",
info.entry, kexec_flags);
diff -puN kexec/kexec.h~kexec-tools-crashdump-backup-x86 kexec/kexec.h
--- kexec-tools-1.101/kexec/kexec.h~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/kexec/kexec.h 2005-02-24 18:55:46.000000000 +0530
@@ -91,6 +91,8 @@ do { \
} while(0)
#endif
+extern unsigned long long mem_min, mem_max;
+
struct kexec_segment {
const void *buf;
size_t bufsz;
@@ -112,10 +114,12 @@ struct kexec_info {
int nr_segments;
void *entry;
struct mem_ehdr rhdr;
+ unsigned long backup_start;
};
void usage(void);
-int get_memory_ranges(struct memory_range **range, int *ranges);
+int get_memory_ranges(struct memory_range **range, int *ranges,
+ unsigned long kexec_flags);
int valid_memory_range(unsigned long sstart, unsigned long send);
int valid_memory_segment(struct kexec_segment *segment);
void print_segments(FILE *file, struct kexec_info *info);
@@ -128,7 +132,7 @@ unsigned long locate_hole(struct kexec_i
typedef int (probe_t)(const char *kernel_buf, off_t kernel_size);
typedef int (load_t )(int argc, char **argv,
const char *kernel_buf, off_t kernel_size,
- struct kexec_info *info);
+ struct kexec_info *info, unsigned long kexec_flags);
typedef void (usage_t)(void);
struct file_type {
const char *name;
@@ -189,6 +193,6 @@ extern size_t purgatory_size;
void arch_usage(void);
int arch_process_options(int argc, char **argv);
int arch_compat_trampoline(struct kexec_info *info, unsigned long *flags);
-void arch_update_purgatory(struct kexec_info *info);
+void arch_update_purgatory(struct kexec_info *info, unsigned long kexec_flags);
#endif /* KEXEC_H */
diff -puN purgatory/arch/i386/Makefile~kexec-tools-crashdump-backup-x86 purgatory/arch/i386/Makefile
--- kexec-tools-1.101/purgatory/arch/i386/Makefile~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/purgatory/arch/i386/Makefile 2005-02-24 18:55:46.000000000 +0530
@@ -12,3 +12,4 @@ PURGATORY_C_SRCS+= purgatory/arch/i386/p
PURGATORY_C_SRCS+= purgatory/arch/i386/console-x86.c
PURGATORY_C_SRCS+= purgatory/arch/i386/vga.c
PURGATORY_C_SRCS+= purgatory/arch/i386/pic.c
+PURGATORY_C_SRCS+= purgatory/arch/i386/crashdump_backup.c
diff -puN /dev/null purgatory/arch/i386/crashdump_backup.c
--- /dev/null 2004-06-16 19:10:55.000000000 +0530
+++ kexec-tools-1.101-root/purgatory/arch/i386/crashdump_backup.c 2005-02-24 18:55:46.000000000 +0530
@@ -0,0 +1,44 @@
+/*
+ * kexec: Linux boots Linux
+ *
+ * Created by: Vivek goyal (vgoyal@in.ibm.com)
+ * Copyright (C) IBM Corporation, 2005. All rights reserved
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#define BACKUP_REGION_SOURCE 0x00000000
+#define BACKUP_REGION_SIZE 0xa0000
+
+/* Backup region start gets set after /proc/iomem has been parsed. */
+uint32_t backup_start = 0;
+
+/* Backup first 640K of memory to backup region as reserved by kexec.
+ * Assuming first 640K has to be present on i386 machines and no address
+ * validity checks have to be performed. */
+
+void crashdump_backup_memory(void)
+{
+ void *dest, *src;
+
+ src = (void *) BACKUP_REGION_SOURCE;
+
+ if (backup_start) {
+ dest = (void *)(backup_start);
+ memcpy(dest, src, BACKUP_REGION_SIZE);
+ }
+}
diff -puN purgatory/arch/i386/purgatory-x86.c~kexec-tools-crashdump-backup-x86 purgatory/arch/i386/purgatory-x86.c
--- kexec-tools-1.101/purgatory/arch/i386/purgatory-x86.c~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/purgatory/arch/i386/purgatory-x86.c 2005-02-24 18:55:46.000000000 +0530
@@ -30,6 +30,7 @@ void x86_setup_cpu(void)
uint8_t reset_vga = 0;
uint8_t legacy_timer = 0;
uint8_t legacy_pic = 0;
+uint8_t panic_kernel = 0;
void setup_arch(void)
{
@@ -37,4 +38,5 @@ void setup_arch(void)
if (reset_vga) x86_reset_vga();
if (legacy_pic) x86_setup_legacy_pic();
/* if (legacy_timer) x86_setup_legacy_timer(); */
+ if (panic_kernel) crashdump_backup_memory();
}
diff -puN purgatory/arch/i386/purgatory-x86.h~kexec-tools-crashdump-backup-x86 purgatory/arch/i386/purgatory-x86.h
--- kexec-tools-1.101/purgatory/arch/i386/purgatory-x86.h~kexec-tools-crashdump-backup-x86 2005-02-24 18:55:46.000000000 +0530
+++ kexec-tools-1.101-root/purgatory/arch/i386/purgatory-x86.h 2005-02-24 18:55:46.000000000 +0530
@@ -4,5 +4,6 @@
void x86_reset_vga(void);
void x86_setup_legacy_pic(void);
void x86_setup_legacy_timer(void);
+void crashdump_backup_memory(void);
#endif /* PURGATORY_X86_H */
_
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