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-rw-r--r--arch/powerpc/kernel/head_64.S19
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 1697a25ebe9..0886ae6dd5b 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -122,6 +122,8 @@ __secondary_hold:
#endif
/* Grab our physical cpu number */
mr r24,r3
+ /* stash r4 for book3e */
+ mr r25,r4
/* Tell the master cpu we're here */
/* Relocation is off & we are located at an address less */
@@ -129,16 +131,31 @@ __secondary_hold:
std r24,__secondary_hold_acknowledge-_stext(0)
sync
+ li r26,0
+#ifdef CONFIG_PPC_BOOK3E
+ tovirt(r26,r26)
+#endif
/* All secondary cpus wait here until told to start. */
-100: ld r4,__secondary_hold_spinloop-_stext(0)
+100: ld r4,__secondary_hold_spinloop-_stext(r26)
cmpdi 0,r4,0
beq 100b
#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
+#ifdef CONFIG_PPC_BOOK3E
+ tovirt(r4,r4)
+#endif
ld r4,0(r4) /* deref function descriptor */
mtctr r4
mr r3,r24
+ /*
+ * it may be the case that other platforms have r4 right to
+ * begin with, this gives us some safety in case it is not
+ */
+#ifdef CONFIG_PPC_BOOK3E
+ mr r4,r25
+#else
li r4,0
+#endif
/* Make sure that patched code is visible */
isync
bctr