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Commit f8f50b1b authored by Dale Farnsworth's avatar Dale Farnsworth Committed by Paul Mackerras
Browse files

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: default avatarDale Farnsworth <dale@farnsworth.org>
Signed-off-by: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent ccdcef72

arch/powerpc/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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

arch/powerpc/include/asm/kdump.h

+13 −0
Original line number Diff line number Diff line 
#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

arch/powerpc/kernel/setup_32.c

+2 −0
Original line number Diff line number Diff line
@@ -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))