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| author | Michael Ellerman <michael@ellerman.id.au> | 2005-12-04 18:39:23 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-01-09 14:52:14 +1100 |
| commit | 398ab1fcb960ea0800f40a9c36355855e3e23389 (patch) | |
| tree | eb7eda3afffb3c99fc57b1064c7501e0ee2cf931 | |
| parent | 4693c09a47203d79a9adb69acaf3b3bb3dcf9390 (diff) | |
| download | blackbird-op-linux-398ab1fcb960ea0800f40a9c36355855e3e23389.tar.gz blackbird-op-linux-398ab1fcb960ea0800f40a9c36355855e3e23389.zip | |
[PATCH] powerpc: Add CONFIG_CRASH_DUMP
This patch adds a Kconfig variable, CONFIG_CRASH_DUMP, which configures the
built kernel for use as a Kdump kernel.
Currently "all" this involves is changing the value of KERNELBASE to 32 MB.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
| -rw-r--r-- | arch/powerpc/Kconfig | 11 | ||||
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 3 | ||||
| -rw-r--r-- | include/asm-powerpc/page.h | 10 |
3 files changed, 23 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 2c1186ada3ab..773b880d5577 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -379,6 +379,17 @@ config CELL_IIC bool default y +config CRASH_DUMP + bool "kernel crash dumps (EXPERIMENTAL)" + depends on PPC_MULTIPLATFORM + depends on EXPERIMENTAL + help + Build a kernel suitable for use as a kdump capture kernel. + The kernel will be linked at a different address than normal, and + so can only be used for Kdump. + + Don't change this unless you know what you are doing. + config IBMVIO depends on PPC_PSERIES || PPC_ISERIES bool diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 65603e9af984..6509dd7c2f8f 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -512,6 +512,9 @@ void __init setup_system(void) ppc64_caches.iline_size); printk("htab_address = 0x%p\n", htab_address); printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); +#if PHYSICAL_START > 0 + printk("physical_start = 0x%x\n", PHYSICAL_START); +#endif printk("-----------------------------------------------------\n"); mm_init_ppc64(); diff --git a/include/asm-powerpc/page.h b/include/asm-powerpc/page.h index 4696bdbcc085..76d7cb4b4ffc 100644 --- a/include/asm-powerpc/page.h +++ b/include/asm-powerpc/page.h @@ -51,8 +51,16 @@ * * If you want to test if something's a kernel address, use is_kernel_addr(). */ + +#ifdef CONFIG_CRASH_DUMP +/* Kdump kernel runs at 32 MB, change at your peril. */ +#define PHYSICAL_START 0x2000000 +#else +#define PHYSICAL_START 0x0 +#endif + #define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START) -#define KERNELBASE PAGE_OFFSET +#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START) #ifdef CONFIG_DISCONTIGMEM #define page_to_pfn(page) discontigmem_page_to_pfn(page) |
