From d34c5f26cf7de52a72ee064698817a5a39b91767 Mon Sep 17 00:00:00 2001 From: Mahesh Salgaonkar Date: Thu, 16 Feb 2012 01:14:53 +0000 Subject: [PATCH] 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/fadump.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index da68bda..a83bc90 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -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++) { -- 2.7.4