powerpc/ppc64/kdump: Better flag for running relocatable

[linux-2.6-omap-h63xx.git] / arch / powerpc / kernel / head_64.S

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 69489bd3210c03ecf9c6d5e36fe5bee1c23e8871..b4bcf5a930fafd50a350d6e97bf8cf8cde833764 100644 (file)
--- 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 */