Add save_tar() function to save the Target Address Register (TAR). This will
be used in a future patch to save the TAR earlier than it currently is.
Signed-off-by: Michael Neuling <mi...@neuling.org>
Cc: <sta...@vger.kernel.org>
---
arch/powerpc/include/asm/switch_to.h | 9 +++++++++
arch/powerpc/kernel/entry_64.S | 1 -
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/switch_to.h
b/arch/powerpc/include/asm/switch_to.h
index 49a13e0..294c2ce 100644
--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h
@@ -15,6 +15,15 @@ extern struct task_struct *__switch_to(struct task_struct *,
struct thread_struct;
extern struct task_struct *_switch(struct thread_struct *prev,
struct thread_struct *next);
+#ifdef CONFIG_PPC_BOOK3S_64
+static inline void save_tar(struct thread_struct *prev)
+{
+ if (cpu_has_feature(CPU_FTR_ARCH_207S))
+ prev->tar = mfspr(SPRN_TAR);
+}
+#else
+static inline void save_tar(struct thread_struct *prev) {}
+#endif
extern void giveup_fpu(struct task_struct *);
extern void load_up_fpu(void);
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 4674fe6..cfb6de4 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -389,7 +389,6 @@ DSCR_DEFAULT:
.tc dscr_default[TC],dscr_default
.section ".text"
-
/*
* This routine switches between two different tasks. The process
* state of one is saved on its kernel stack. Then the state
--
1.8.1.2
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