[RFC Patch 6/6] Adapt kexec and samples code to recognise PPC64 hardware breakpoint usage

[K.Prasad]

Modify kexec code to disable DABR registers before a reboot. Adapt the samples
code to populate PPC64-arch specific fields.

Signed-off-by: K.Prasad <prasad at linux.vnet.ibm.com>
---
 arch/powerpc/kernel/machine_kexec_64.c   |    6 
 samples/hw_breakpoint/data_breakpoint.c  |    4 

Index: linux-2.6-tip.hbkpt/arch/powerpc/kernel/machine_kexec_64.c
===================================================================
--- linux-2.6-tip.hbkpt.orig/arch/powerpc/kernel/machine_kexec_64.c	2009-05-14 00:17:24.000000000 +0530
+++ linux-2.6-tip.hbkpt/arch/powerpc/kernel/machine_kexec_64.c	2009-05-14 09:48:09.000000000 +0530
@@ -24,6 +24,7 @@
 #include <asm/sections.h>	/* _end */
 #include <asm/prom.h>
 #include <asm/smp.h>
+#include <asm/hw_breakpoint.h>
 
 int default_machine_kexec_prepare(struct kimage *image)
 {
@@ -214,6 +215,9 @@
 	put_cpu();
 
 	local_irq_disable();
+#ifdef CONFIG_PPC64
+	hw_breakpoint_disable();
+#endif
 }
 
 #else /* ! SMP */
@@ -233,6 +237,9 @@
 	if (ppc_md.kexec_cpu_down)
 		ppc_md.kexec_cpu_down(0, 0);
 	local_irq_disable();
+#ifdef CONFIG_PPC64
+	hw_breakpoint_disable();
+#endif
 }
 
 #endif /* SMP */
Index: linux-2.6-tip.hbkpt/samples/hw_breakpoint/data_breakpoint.c
===================================================================
--- linux-2.6-tip.hbkpt.orig/samples/hw_breakpoint/data_breakpoint.c	2009-05-14 00:17:24.000000000 +0530
+++ linux-2.6-tip.hbkpt/samples/hw_breakpoint/data_breakpoint.c	2009-05-14 00:58:06.000000000 +0530
@@ -54,6 +54,10 @@
 	sample_hbp.info.type = HW_BREAKPOINT_WRITE;
 	sample_hbp.info.len = HW_BREAKPOINT_LEN_4;
 #endif /* CONFIG_X86 */
+#ifdef CONFIG_PPC64
+	sample_hbp.info.name = ksym_name;
+	sample_hbp.info.type = DABR_DATA_WRITE;
+#endif /* CONFIG_PPC64 */
 
 	sample_hbp.triggered = (void *)sample_hbp_handler;