/* Loads additional segments in case of a panic kernel is being loaded.
* One segment for backup region, another segment for storing elf headers
* for crash memory image.
*/
int load_crashdump_segments(struct kexec_info *info, char* mod_cmdline,
unsigned long max_addr, unsigned long min_base)
{
void *tmp;
unsigned long sz, elfcorehdr;
int nr_ranges, align = 1024, i;
struct memory_range *mem_range, *memmap_p;
struct crash_elf_info elf_info =
{
class: ELFCLASS64,
data: ELFDATA2LSB,
machine: EM_X86_64,
backup_src_start: BACKUP_SRC_START,
backup_src_end: BACKUP_SRC_END,
page_offset: page_offset,
};
if (get_kernel_paddr(info))
return -1;
if (get_kernel_vaddr_and_size(info))
return -1;
if (get_crash_memory_ranges(&mem_range, &nr_ranges,
info->kexec_flags) < 0)
return -1;
/* Memory regions which panic kernel can safely use to boot into */
sz = (sizeof(struct memory_range) * (KEXEC_MAX_SEGMENTS + 1));
memmap_p = xmalloc(sz);
memset(memmap_p, 0, sz);
add_memmap(memmap_p, BACKUP_SRC_START, BACKUP_SRC_SIZE);
sz = crash_reserved_mem.end - crash_reserved_mem.start +1;
add_memmap(memmap_p, crash_reserved_mem.start, sz);
/* Create a backup region segment to store backup data*/
if (!(info->kexec_flags & KEXEC_PRESERVE_CONTEXT)) {
sz = (BACKUP_SRC_SIZE + align - 1) & ~(align - 1);
tmp = xmalloc(sz);
memset(tmp, 0, sz);
info->backup_start = add_buffer(info, tmp, sz, sz, align,
0, max_addr, 1);
if (delete_memmap(memmap_p, info->backup_start, sz) < 0)
return -1;
}
/* Create elf header segment and store crash image data. */
if (crash_create_elf64_headers(info, &elf_info,
crash_memory_range, nr_ranges,
&tmp, &sz,
ELF_CORE_HEADER_ALIGN) < 0)
return -1;
/* Hack: With some ld versions (GNU ld version 2.14.90.0.4 20030523),
* vmlinux program headers show a gap of two pages between bss segment
* and data segment but effectively kernel considers it as bss segment
* and overwrites the any data placed there. Hence bloat the memsz of
* elf core header segment to 16K to avoid being placed in such gaps.
* This is a makeshift solution until it is fixed in kernel.
*/
elfcorehdr = add_buffer(info, tmp, sz, 16*1024, align, min_base,
max_addr, -1);
if (delete_memmap(memmap_p, elfcorehdr, sz) < 0)
return -1;
cmdline_add_memmap(mod_cmdline, memmap_p);
cmdline_add_elfcorehdr(mod_cmdline, elfcorehdr);
/* Inform second kernel about the presence of ACPI tables. */
for (i = 0; i < CRASH_MAX_MEMORY_RANGES; i++) {
unsigned long start, end;
if ( !( mem_range[i].type == RANGE_ACPI
|| mem_range[i].type == RANGE_ACPI_NVS) )
continue;
start = mem_range[i].start;
end = mem_range[i].end;
cmdline_add_memmap_acpi(mod_cmdline, start, end);
}
return 0;
}
/* Loads additional segments in case of a panic kernel is being loaded.
* One segment for backup region, another segment for storing elf headers
* for crash memory image.
*/
int load_crashdump_segments(struct kexec_info *info, char* mod_cmdline,
unsigned long max_addr, unsigned long min_base)
{
void *tmp;
unsigned long sz, elfcorehdr;
int nr_ranges, align = 1024;
struct memory_range *mem_range, *memmap_p;
if (get_crash_memory_ranges(&mem_range, &nr_ranges) < 0)
return -1;
/*
* if the core type has not been set on command line, set it here
* automatically
*/
if (arch_options.core_header_type == CORE_TYPE_UNDEF) {
arch_options.core_header_type =
get_core_type(info, mem_range, nr_ranges);
}
/* Memory regions which panic kernel can safely use to boot into */
sz = (sizeof(struct memory_range) * (KEXEC_MAX_SEGMENTS + 1));
memmap_p = xmalloc(sz);
memset(memmap_p, 0, sz);
add_memmap(memmap_p, BACKUP_SRC_START, BACKUP_SRC_SIZE);
sz = crash_reserved_mem.end - crash_reserved_mem.start +1;
add_memmap(memmap_p, crash_reserved_mem.start, sz);
/* Create a backup region segment to store backup data*/
sz = (BACKUP_SRC_SIZE + align - 1) & ~(align - 1);
tmp = xmalloc(sz);
memset(tmp, 0, sz);
info->backup_start = add_buffer(info, tmp, sz, sz, align,
0, max_addr, -1);
dbgprintf("Created backup segment at 0x%lx\n", info->backup_start);
if (delete_memmap(memmap_p, info->backup_start, sz) < 0)
return -1;
/* Create elf header segment and store crash image data. */
if (arch_options.core_header_type == CORE_TYPE_ELF64) {
if (crash_create_elf64_headers(info, &elf_info64,
crash_memory_range, nr_ranges,
&tmp, &sz,
ELF_CORE_HEADER_ALIGN) < 0)
return -1;
}
else {
if (crash_create_elf32_headers(info, &elf_info32,
crash_memory_range, nr_ranges,
&tmp, &sz,
ELF_CORE_HEADER_ALIGN) < 0)
return -1;
}
/* Hack: With some ld versions (GNU ld version 2.14.90.0.4 20030523),
* vmlinux program headers show a gap of two pages between bss segment
* and data segment but effectively kernel considers it as bss segment
* and overwrites the any data placed there. Hence bloat the memsz of
* elf core header segment to 16K to avoid being placed in such gaps.
* This is a makeshift solution until it is fixed in kernel.
*/
elfcorehdr = add_buffer(info, tmp, sz, 16*1024, align, min_base,
max_addr, -1);
dbgprintf("Created elf header segment at 0x%lx\n", elfcorehdr);
if (delete_memmap(memmap_p, elfcorehdr, sz) < 0)
return -1;
cmdline_add_memmap(mod_cmdline, memmap_p);
cmdline_add_elfcorehdr(mod_cmdline, elfcorehdr);
return 0;
}