[PATCH] powerpc: Merge kexec

This patch merges, to some extent, the PPC32 and PPC64 kexec implementations.

We adopt the PPC32 approach of having ppc_md callbacks for the kexec functions.
The current PPC64 implementation becomes the "default" implementation for PPC64
which platforms can select if they need no special treatment.

I've added these default callbacks to pseries/maple/cell/powermac, this means
iSeries no longer supports kexec - but it never worked anyway.

I've renamed PPC32's machine_kexec_simple to default_machine_kexec, inline with
PPC64. Judging by the comments it might be better named machine_kexec_non_of,
or something, but at the moment it's the only implementation for PPC32 so it's
the "default".

Kexec requires machine_shutdown(), which is in machine_kexec.c on PPC32, but we
already have in setup-common.c on powerpc. All this does is call
ppc_md.nvram_sync, which only powermac implements, so instead make
machine_shutdown a ppc_md member and have it call core99_nvram_sync directly
on powermac.

I've also stuck relocate_kernel.S into misc_32.S for powerpc.

Built for ARCH=ppc, and 32 & 64 bit ARCH=powerpc, with KEXEC=y/n. Booted on
P5 LPAR and successfully kexec'ed.

Should apply on top of 493f25ef4087395891c99fcfe2c72e62e293e89f.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 9 insertions, 6 deletions

diff --git a/include/asm-powerpc/kexec.h b/include/asm-powerpc/kexec.h
index c72ffc709ea8..934b4981651d 100644
--- a/include/asm-powerpc/kexec.h
+++ b/include/asm-powerpc/kexec.h
@@ -41,10 +41,11 @@ extern note_buf_t crash_notes[];
 extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
                                           master to copy new code to 0 */
 extern void __init kexec_setup(void);
-#else
-struct kimage;
-extern void machine_kexec_simple(struct kimage *image);
 #endif
 
+struct kimage;
+extern void default_machine_kexec(struct kimage *image);
+extern int default_machine_kexec_prepare(struct kimage *image);
+
 #endif /* ! __ASSEMBLY__ */
 #endif /* _ASM_POWERPC_KEXEC_H */
diff --git a/include/asm-powerpc/machdep.h b/include/asm-powerpc/machdep.h
index c011abb8b600..d6a1a2b5507d 100644
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -27,6 +27,9 @@ struct device_node;
 struct iommu_table;
 struct rtc_time;
 struct file;
+#ifdef CONFIG_KEXEC
+struct kimage;
+#endif
 
 #ifdef CONFIG_SMP
 struct smp_ops_t {
@@ -207,14 +210,14 @@ struct machdep_calls {
 
         /* this is for modules, since _machine can be a define -- Cort */
         int ppc_machine;
+#endif /* CONFIG_PPC32 */
 
-#ifdef CONFIG_KEXEC
         /* Called to shutdown machine specific hardware not already controlled
          * by other drivers.
-         * XXX Should we move this one out of kexec scope?
          */
         void (*machine_shutdown)(void);
 
+#ifdef CONFIG_KEXEC
         /* Called to do the minimal shutdown needed to run a kexec'd kernel
          * to run successfully.
          * XXX Should we move this one out of kexec scope?
@@ -237,7 +240,6 @@ struct machdep_calls {
          */
         void (*machine_kexec)(struct kimage *image);
 #endif /* CONFIG_KEXEC */
-#endif /* CONFIG_PPC32 */
 };
 
 extern void default_idle(void);