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fadump: Add PT_NOTE program header for vmcoreinfo 

Introduce a PT_NOTE program header that points to physical address of
vmcoreinfo_note buffer declared in kernel/kexec.c. The vmcoreinfo
note buffer is populated during crash_fadump() at the time of system
crash.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Mahesh Salgaonkar 2012-02-16 01:14:53 +00:00 committed by Benjamin Herrenschmidt
parent ebaeb5ae24
commit d34c5f26cf
1 changed files with 29 additions and 0 deletions
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29
arch/powerpc/kernel/fadump.c
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@ -814,6 +814,19 @@ static void fadump_setup_crash_memory_ranges(void)
}
}
/*
* If the given physical address falls within the boot memory region then
* return the relocated address that points to the dump region reserved
* for saving initial boot memory contents.
*/
static inline unsigned long fadump_relocate(unsigned long paddr)
{
if (paddr > RMA_START && paddr < fw_dump.boot_memory_size)
return fdm.rmr_region.destination_address + paddr;
else
return paddr;
}
static int fadump_create_elfcore_headers(char *bufp)
{
struct elfhdr *elf;
@ -845,6 +858,22 @@ static int fadump_create_elfcore_headers(char *bufp)
(elf->e_phnum)++;
/* setup ELF PT_NOTE for vmcoreinfo */
phdr = (struct elf_phdr *)bufp;
bufp += sizeof(struct elf_phdr);
phdr->p_type = PT_NOTE;
phdr->p_flags = 0;
phdr->p_vaddr = 0;
phdr->p_align = 0;
phdr->p_paddr = fadump_relocate(paddr_vmcoreinfo_note());
phdr->p_offset = phdr->p_paddr;
phdr->p_memsz = vmcoreinfo_max_size;
phdr->p_filesz = vmcoreinfo_max_size;
/* Increment number of program headers. */
(elf->e_phnum)++;
/* setup PT_LOAD sections. */
for (i = 0; i < crash_mem_ranges; i++) {