/* Loads additional segments in case of a panic kernel is being loaded.
* One segment for storing elf headers for crash memory image.
*/
int load_crashdump_segments(struct kexec_info *info, char* mod_cmdline)
{
void *tmp;
unsigned long sz, elfcorehdr;
int nr_ranges;
struct memory_range *mem_range;
if (crash_get_memory_ranges(&mem_range, &nr_ranges) < 0)
return -1;
if (crash_create_elf32_headers(info, &elf_info32,
mem_range, nr_ranges,
&tmp, &sz,
ELF_CORE_HEADER_ALIGN) < 0)
return -1;
elfcorehdr = add_buffer_phys_virt(info, tmp, sz, sz, 1024,
0, 0xffffffff, -1, 0);
dbgprintf("Created elf header segment at 0x%lx\n", elfcorehdr);
add_cmdline_param(mod_cmdline, elfcorehdr, " elfcorehdr=", "K");
add_cmdline_param(mod_cmdline, elfcorehdr - mem_min, " mem=", "K");
return 0;
}
/**
* load_crashdump_segments() - loads additional segments needed for kdump
* @info: kexec info structure
* @mod_cmdline: kernel command line
*
* This function loads additional segments which are needed for the dump capture
* kernel. It also updates kernel command line passed in @mod_cmdline to have
* right parameters for the dump capture kernel.
*
* Return %0 in case of success and %-1 in case of error.
*/
int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline)
{
unsigned long elfcorehdr;
unsigned long bufsz;
void *buf;
int err;
/*
* First fetch all the memory (RAM) ranges that we are going to pass to
* the crashdump kernel during panic.
*/
err = crash_get_memory_ranges();
if (err)
return err;
/*
* Now that we have memory regions sorted, we can use first memory
* region as PHYS_OFFSET.
*/
phys_offset = crash_memory_ranges[0].start;
dbgprintf("phys_offset: %#lx\n", phys_offset);
err = crash_create_elf32_headers(info, &elf_info, crash_memory_ranges,
crash_memory_nr_ranges, &buf, &bufsz,
ELF_CORE_HEADER_ALIGN);
if (err)
return err;
/*
* We allocate ELF core header from the end of the memory area reserved
* for the crashkernel. We align the header to SECTION_SIZE (which is
* 1MB) so that available memory passed in kernel command line will be
* aligned to 1MB. This is because kernel create_mapping() wants memory
* regions to be aligned to SECTION_SIZE.
*/
elfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 1 << 20,
crash_reserved_mem.start,
crash_reserved_mem.end, -1, 0);
dbgprintf("elfcorehdr: %#lx\n", elfcorehdr);
cmdline_add_elfcorehdr(mod_cmdline, elfcorehdr);
/*
* Add 'mem=size' parameter to dump capture kernel command line. This
* prevents the dump capture kernel from using any other memory regions
* which belong to the primary kernel.
*/
cmdline_add_mem(mod_cmdline, elfcorehdr - crash_reserved_mem.start);
dump_memory_ranges();
dbgprintf("kernel command line: \"%s\"\n", mod_cmdline);
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,
uint64_t max_addr, unsigned long min_base)
{
void *tmp;
unsigned long sz;
uint64_t elfcorehdr;
int nr_ranges, align = 1024, i;
unsigned long long end;
struct memory_range *mem_range;
if (get_crash_memory_ranges(&mem_range, &nr_ranges) < 0)
return -1;
/* 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);
reserve(info->backup_start, sz);
/* On ppc64 memory ranges in device-tree is denoted as start
* and size rather than start and end, as is the case with
* other architectures like i386 . Because of this when loading
* the memory ranges in crashdump-elf.c the filesz calculation
* [ end - start + 1 ] goes for a toss.
*
* To be in sync with other archs adjust the end value for
* every crash memory range before calling the generic function
*/
for (i = 0; i < nr_ranges; i++) {
end = crash_memory_range[i].end - 1;
crash_memory_range[i].end = end;
}
/* 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;
}
elfcorehdr = add_buffer(info, tmp, sz, sz, align, min_base,
max_addr, 1);
reserve(elfcorehdr, sz);
/* modify and store the cmdline in a global array. This is later
* read by flatten_device_tree and modified if required
*/
add_cmdline_param(mod_cmdline, elfcorehdr, " elfcorehdr=", "K");
add_cmdline_param(mod_cmdline, saved_max_mem, " savemaxmem=", "M");
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;
}
