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sh: prefetch early exception data on sh4/sh4a.

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Prefetch early exception data. There is unused space in our
exception handler cache line anyway, so this is almost free.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-02-27 16:41:17 +09:00 committed by Paul Mundt
parent 4f099ebb27
commit 0197f21ca5
2 changed files with 10 additions and 2 deletions
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5
arch/sh/include/asm/entry-macros.S
View File

@ -31,3 +31,8 @@
#endif
.endm
#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
# define PREF(x) pref @x
#else
# define PREF(x) nop
#endif

7
arch/sh/kernel/cpu/sh3/entry.S
View File

@ -463,9 +463,11 @@ tlb_miss:
sts pr, k3 ! save original pr value in k3
handle_exception:
mova exception_data, k0
! Setup stack and save DSP context (k0 contains original r15 on return)
bsr prepare_stack_save_dsp
nop
PREF(k0)
! Save registers / Switch to bank 0
mov.l 5f, k2 ! vector register address
@ -556,10 +558,11 @@ ENTRY(handle_interrupt)
11:
#endif /* defined(CONFIG_KGDB) */
sts pr, k3 ! save original pr value in k3
mova exception_data, k0
! Setup stack and save DSP context (k0 contains original r15 on return)
bsr prepare_stack_save_dsp
nop
PREF(k0)
! Save registers / Switch to bank 0
bsr save_regs ! needs original pr value in k3