powerpc/32: Wire up the trampoline code for kdump

Wire up the trampoline code for ppc32 to relay exceptions from the
vectors at address 0 to vectors at address 32MB, and modify Kconfig
to enable Kdump support for all classic powerpcs.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Dale Farnsworth 2008-12-17 10:09:26 +00:00 committed by Paul Mackerras
parent ccdcef72c2
commit f8f50b1bdd
3 changed files with 16 additions and 1 deletions

View File

@ -326,7 +326,7 @@ config KEXEC
config CRASH_DUMP
bool "Build a kdump crash kernel"
depends on PPC_MULTIPLATFORM && PPC64 && RELOCATABLE
depends on (PPC64 && RELOCATABLE) || 6xx
help
Build a kernel suitable for use as a kdump capture kernel.
The same kernel binary can be used as production kernel and dump

View File

@ -1,6 +1,8 @@
#ifndef _PPC64_KDUMP_H
#define _PPC64_KDUMP_H
#include <asm/page.h>
/* Kdump kernel runs at 32 MB, change at your peril. */
#define KDUMP_KERNELBASE 0x2000000
@ -11,8 +13,19 @@
#ifdef CONFIG_CRASH_DUMP
/*
* On PPC64 translation is disabled during trampoline setup, so we use
* physical addresses. Though on PPC32 translation is already enabled,
* so we can't do the same. Luckily create_trampoline() creates relative
* branches, so we can just add the PAGE_OFFSET and don't worry about it.
*/
#ifdef __powerpc64__
#define KDUMP_TRAMPOLINE_START 0x0100
#define KDUMP_TRAMPOLINE_END 0x3000
#else
#define KDUMP_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
#define KDUMP_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
#endif /* __powerpc64__ */
#define KDUMP_MIN_TCE_ENTRIES 2048

View File

@ -126,6 +126,8 @@ notrace void __init machine_init(unsigned long dt_ptr)
probe_machine();
setup_kdump_trampoline();
#ifdef CONFIG_6xx
if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
cpu_has_feature(CPU_FTR_CAN_NAP))