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powerpc/85xx: Save scratch registers to thread info instead of using SPRGs.

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We expect this is actually faster, and we end up needing more space than we
can get from the SPRGs in some instances.  This is also useful when running
as a guest OS - SPRGs4-7 do not have guest versions.

8 slots are allocated in thread_info for this even though we only actually
use 4 of them - this allows space for future code to have more scratch
space (and we know we'll need it for things like hugetlb).

Signed-off-by: Ashish Kalra <Ashish.Kalra@freescale.com>
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Ashish Kalra
2011-04-22 16:48:27 -05:00
committed by Kumar Gala
parent dc2c9c52b6
commit 1325a684b5
5 changed files with 63 additions and 40 deletions
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5
arch/powerpc/include/asm/processor.h
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@ -20,6 +20,7 @@
#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/cache.h>
#include <asm/ptrace.h>
#include <asm/types.h>
@ -156,6 +157,10 @@ struct thread_struct {
#endif
struct pt_regs *regs; /* Pointer to saved register state */
mm_segment_t fs; /* for get_fs() validation */
#ifdef CONFIG_BOOKE
/* BookE base exception scratch space; align on cacheline */
unsigned long normsave[8] ____cacheline_aligned;
#endif
#ifdef CONFIG_PPC32
void *pgdir; /* root of page-table tree */
#endif