[PATCH] various xmon cleanups

Heres a patch I've had for a while, it removes a bunch of debugger code
which is good :) The next patch will sanitise it (and the rest of the
debugger hooks).

Various xmon cleanups

- recover from bad SPR read/write (we get a program check)
- remove some old code (bat and segment register stuff)
- update the help text to match reality
- add a "press ? for help" when xmon first appears to make rusty happy
- protect against flushing bad parts of memory from Milton
- dont print iseries specific stuff on pseries in SPR dump (S)
- add code to dump the segment table or SLB
- remove a number of functions that wouldnt work on LPAR

arch/ppc64/kernel/traps.c

@@ -372,6 +372,13 @@ ProgramCheckException(struct pt_regs *regs)
 {
 	siginfo_t info;
 
+#ifdef CONFIG_DEBUG_KERNEL
+	if (debugger_fault_handler) {
+		debugger_fault_handler(regs);
+		return;
+	}
+#endif
+
 	if (regs->msr & 0x100000) {
 		/* IEEE FP exception */
 

arch/ppc64/xmon/privinst.h

@@ -43,39 +43,12 @@ GSETSPR(274, sprg2)
 GSETSPR(275, sprg3)
 GSETSPR(282, ear)
 GSETSPR(287, pvr)
-GSETSPR(528, bat0u)
-GSETSPR(529, bat0l)
-GSETSPR(530, bat1u)
-GSETSPR(531, bat1l)
-GSETSPR(532, bat2u)
-GSETSPR(533, bat2l)
-GSETSPR(534, bat3u)
-GSETSPR(535, bat3l)
 GSETSPR(1008, hid0)
 GSETSPR(1009, hid1)
 GSETSPR(1010, iabr)
 GSETSPR(1013, dabr)
 GSETSPR(1023, pir)
 
-static inline int get_sr(int n)
-{
-	int ret;
-
-#if 0
-	// DRENG does not assemble 
-	asm (" mfsrin %0,%1" : "=r" (ret) : "r" (n << 28));
-#endif
-	return ret;
-}
-
-static inline void set_sr(int n, int val)
-{
-#if 0
-	// DRENG does not assemble 
-	asm ("mtsrin %0,%1" : : "r" (val), "r" (n << 28));
-#endif
-}
-
 static inline void store_inst(void *p)
 {
 	asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p));
@@ -90,4 +63,3 @@ static inline void cinval(void *p)
 {
 	asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p));
 }
-