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-rw-r--r--arch/powerpc/kernel/head_64.S30
1 files changed, 19 insertions, 11 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 69489bd3210..b4bcf5a930f 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -97,12 +97,6 @@ __secondary_hold_spinloop:
__secondary_hold_acknowledge:
.llong 0x0
- /* This flag is set by purgatory if we should be a kdump kernel. */
- /* Do not move this variable as purgatory knows about it. */
- .globl __kdump_flag
-__kdump_flag:
- .llong 0x0
-
#ifdef CONFIG_PPC_ISERIES
/*
* At offset 0x20, there is a pointer to iSeries LPAR data.
@@ -112,6 +106,20 @@ __kdump_flag:
.llong hvReleaseData-KERNELBASE
#endif /* CONFIG_PPC_ISERIES */
+#ifdef CONFIG_CRASH_DUMP
+ /* This flag is set to 1 by a loader if the kernel should run
+ * at the loaded address instead of the linked address. This
+ * is used by kexec-tools to keep the the kdump kernel in the
+ * crash_kernel region. The loader is responsible for
+ * observing the alignment requirement.
+ */
+ /* Do not move this variable as kexec-tools knows about it. */
+ . = 0x5c
+ .globl __run_at_load
+__run_at_load:
+ .long 0x72756e30 /* "run0" -- relocate to 0 by default */
+#endif
+
. = 0x60
/*
* The following code is used to hold secondary processors
@@ -1391,8 +1399,8 @@ _STATIC(__after_prom_start)
lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */
sldi r25,r25,32
#ifdef CONFIG_CRASH_DUMP
- ld r7,__kdump_flag-_stext(r26)
- cmpldi cr0,r7,1 /* kdump kernel ? - stay where we are */
+ lwz r7,__run_at_load-_stext(r26)
+ cmplwi cr0,r7,1 /* kdump kernel ? - stay where we are */
bne 1f
add r25,r25,r26
#endif
@@ -1416,11 +1424,11 @@ _STATIC(__after_prom_start)
#ifdef CONFIG_CRASH_DUMP
/*
* Check if the kernel has to be running as relocatable kernel based on the
- * variable __kdump_flag, if it is set the kernel is treated as relocatable
+ * variable __run_at_load, if it is set the kernel is treated as relocatable
* kernel, otherwise it will be moved to PHYSICAL_START
*/
- ld r7,__kdump_flag-_stext(r26)
- cmpldi cr0,r7,1
+ lwz r7,__run_at_load-_stext(r26)
+ cmplwi cr0,r7,1
bne 3f
li r5,__end_interrupts - _stext /* just copy interrupts */