Add machine check register printing

This will print out the Memory Subsystem Status Register on MPC745x (G4+ class),
and the Machine Check Status Register on Book-E class CPUs, to aid in debugging
machine checks.  Other relevant registers, for other CPUs, can be added in the
future.

2 files changed, 20 insertions, 0 deletions

diff --git a/sys/powerpc/include/spr.h b/sys/powerpc/include/spr.h
index a352025..c753f5e 100644
--- a/sys/powerpc/include/spr.h
+++ b/sys/powerpc/include/spr.h
@@ -527,6 +527,14 @@
 #define	  MSSCR0_ABD		  0x00100000 /* 11: address bus driven (read-only) */
 #define	  MSSCR0_MBZ		  0x000fffff /* 12-31: must be zero */
 #define	  MSSCR0_L2PFE		  0x00000003 /* 30-31: L2 prefetch enable */
+#define	SPR_MSSSR0		0x3f7	/* .6. Memory Subsystem Status Register (MPC745x) */
+#define	  MSSSR0_L2TAG		  0x00040000 /* 13: L2 tag parity error */
+#define	  MSSSR0_L2DAT		  0x00020000 /* 14: L2 data parity error */
+#define	  MSSSR0_L3TAG		  0x00010000 /* 15: L3 tag parity error */
+#define	  MSSSR0_L3DAT		  0x00008000 /* 16: L3 data parity error */
+#define	  MSSSR0_APE		  0x00004000 /* 17: Address parity error */
+#define	  MSSSR0_DPE		  0x00002000 /* 18: Data parity error */
+#define	  MSSSR0_TEA		  0x00001000 /* 19: Bus transfer error acknowledge */
 #define	SPR_LDSTCR		0x3f8	/* .6. Load/Store Control Register */
 #define	SPR_L2PM		0x3f8	/* .6. L2 Private Memory Control Register */
 #define	SPR_L2CR		0x3f9	/* .6. L2 Control Register */
diff --git a/sys/powerpc/powerpc/trap.c b/sys/powerpc/powerpc/trap.c
index bfbd94d..0895596 100644
--- a/sys/powerpc/powerpc/trap.c
+++ b/sys/powerpc/powerpc/trap.c
@@ -400,6 +400,7 @@ trap_fatal(struct trapframe *frame)
 static void
 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 {
+	uint16_t ver;
 
 	printf("\n");
 	printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
@@ -421,6 +422,17 @@ printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
 	case EXC_ITMISS:
 		printf("   virtual address = 0x%" PRIxPTR "\n", frame->srr0);
 		break;
+	case EXC_MCHK:
+		ver = mfpvr() >> 16;
+#if defined(AIM)
+		if (MPC745X_P(ver))
+			printf("    msssr0         = 0x%x\n",
+			    mfspr(SPR_MSSSR0));
+#elif defined(BOOKE)
+		printf("    mcsr           = 0x%x\n",
+		    mfspr(SPR_MCSR));
+#endif
+		break;
 	}
 #ifdef BOOKE
 	printf("   esr             = 0x%" PRIxPTR "\n",