[Skiboot] [PATCH] cpu: Clear PCR SPR in opal_reinit_cpus()

[Michael Neuling]

Currently if Linux boots with a non-zero PCR, things can go bad where
some early userspace programs can take illegal instructions. This is
being fixed in Linux, but in the mean time, we should cleanup in
skiboot also.

Signed-off-by: Michael Neuling <mikey at neuling.org>
---
 core/cpu.c          | 1 +
 include/processor.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/core/cpu.c b/core/cpu.c
index 1569c9f6c7..0077103d1a 100644
--- a/core/cpu.c
+++ b/core/cpu.c
@@ -1333,6 +1333,7 @@ static void cpu_cleanup_one(void *param __unused)
 {
 	mtspr(SPR_AMR, 0);
 	mtspr(SPR_IAMR, 0);
+	mtspr(SPR_PCR, 0);
 }
 
 static int64_t cpu_cleanup_all(void)
diff --git a/include/processor.h b/include/processor.h
index 27cc1aa394..6b262b45e0 100644
--- a/include/processor.h
+++ b/include/processor.h
@@ -77,6 +77,7 @@
 #define SPR_LPCR	0x13e
 #define SPR_HMER	0x150	/* Hypervisor Maintenance Exception */
 #define SPR_HMEER	0x151	/* HMER interrupt enable mask */
+#define SPR_PCR		0x152
 #define SPR_AMOR	0x15d
 #define SPR_PSSCR	0x357   /* RW: Stop status and control (ISA 3) */
 #define SPR_TSCR	0x399
-- 
2.14.1