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authorDale Farnsworth <dale@farnsworth.org>2008-12-17 10:09:26 +0000
committerPaul Mackerras <paulus@samba.org>2008-12-23 15:13:29 +1100
commitf8f50b1bddd49eb171398cfc543c957884dc6e35 (patch)
tree0813d5bf36740e6a294e9b07be6d1d8d2cac60df
parentccdcef72c249c289898b164eada89a61855b9287 (diff)
downloadop-kernel-dev-f8f50b1bddd49eb171398cfc543c957884dc6e35.zip
op-kernel-dev-f8f50b1bddd49eb171398cfc543c957884dc6e35.tar.gz
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>
-rw-r--r--arch/powerpc/Kconfig2
-rw-r--r--arch/powerpc/include/asm/kdump.h13
-rw-r--r--arch/powerpc/kernel/setup_32.c2
3 files changed, 16 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index be4f99b..f7f5448 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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
diff --git a/arch/powerpc/include/asm/kdump.h b/arch/powerpc/include/asm/kdump.h
index b07ebb9..5ebfe5d 100644
--- a/arch/powerpc/include/asm/kdump.h
+++ b/arch/powerpc/include/asm/kdump.h
@@ -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
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index d72ef39..9e1ca74 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -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))
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