[POWERPC] Add xmon function to dump 44x TLB

This adds a function to xmon to dump the content of the 44x processor
TLB with a little bit of decoding (but not much).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 121b04d165d1..381d467cf55b 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -153,6 +153,10 @@ static const char *getvecname(unsigned long vec);
 
 static int do_spu_cmd(void);
 
+#ifdef CONFIG_44x
+static void dump_tlb_44x(void);
+#endif
+
 int xmon_no_auto_backtrace;
 
 extern void xmon_enter(void);
@@ -231,6 +235,9 @@ Commands:\n\
 #ifdef CONFIG_PPC_STD_MMU_32
 "  u    dump segment registers\n"
 #endif
+#ifdef CONFIG_44x
+"  u    dump TLB\n"
+#endif
 "  ?    help\n"
 "  zr   reboot\n\
   zh    halt\n"
@@ -856,6 +863,11 @@ cmds(struct pt_regs *excp)
                         dump_segments();
                         break;
 #endif
+#ifdef CONFIG_4xx
+                case 'u':
+                        dump_tlb_44x();
+                        break;
+#endif
                 default:
                         printf("Unrecognized command: ");
                         do {
@@ -2581,6 +2593,32 @@ void dump_segments(void)
 }
 #endif
 
+#ifdef CONFIG_44x
+static void dump_tlb_44x(void)
+{
+        int i;
+
+        for (i = 0; i < PPC44x_TLB_SIZE; i++) {
+                unsigned long w0,w1,w2;
+                asm volatile("tlbre  %0,%1,0" : "=r" (w0) : "r" (i));
+                asm volatile("tlbre  %0,%1,1" : "=r" (w1) : "r" (i));
+                asm volatile("tlbre  %0,%1,2" : "=r" (w2) : "r" (i));
+                printf("[%02x] %08x %08x %08x ", i, w0, w1, w2);
+                if (w0 & PPC44x_TLB_VALID) {
+                        printf("V %08x -> %01x%08x %c%c%c%c%c",
+                               w0 & PPC44x_TLB_EPN_MASK,
+                               w1 & PPC44x_TLB_ERPN_MASK,
+                               w1 & PPC44x_TLB_RPN_MASK,
+                               (w2 & PPC44x_TLB_W) ? 'W' : 'w',
+                               (w2 & PPC44x_TLB_I) ? 'I' : 'i',
+                               (w2 & PPC44x_TLB_M) ? 'M' : 'm',
+                               (w2 & PPC44x_TLB_G) ? 'G' : 'g',
+                               (w2 & PPC44x_TLB_E) ? 'E' : 'e');
+                }
+                printf("\n");
+        }
+}
+#endif /* CONFIG_44x */
 void xmon_init(int enable)
 {
 #ifdef CONFIG_PPC_ISERIES