cpu: Clear PCR SPR in opal_reinit_cpus()

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 <[email protected]> Signed-off-by: Stewart Smith <[email protected]> (cherry picked from commit 3d01958) Signed-off-by: Stewart Smith <[email protected]>
open-power · May 18, 2018 · b179d8f · b179d8f
1 parent 2339591
commit b179d8f
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diff --git 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
@@ -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