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sparc32: Implement hard_smp_processor_id() via instruction patching.

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This is the last non-trivial user of btfixup.

Like sparc64, use a special patch section to resolve the various
implementations of how to read the current CPU's ID when we don't
have current_thread_info()->cpu necessarily available.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
David S. Miller 2012-05-13 23:09:04 -07:00
parent 5d83d66635
commit c68e5d39a5
10 changed files with 99 additions and 175 deletions
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23
arch/sparc/kernel/entry.S
View file

@ -7,6 +7,7 @@
* Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
*/
#include <linux/linkage.h>
#include <linux/errno.h>
#include <asm/head.h>
@ -1347,4 +1348,26 @@ flushw_all:
ret
restore
#ifdef CONFIG_SMP
ENTRY(hard_smp_processor_id)
661: rd %tbr, %g1
srl %g1, 12, %o0
and %o0, 3, %o0
.section .cpuid_patch, "ax"
/* Instruction location. */
.word 661b
/* SUN4D implementation. */
lda [%g0] ASI_M_VIKING_TMP1, %o0
nop
nop
/* LEON implementation. */
rd %asr17, %o0
srl %o0, 0x1c, %o0
nop
.previous
retl
nop
ENDPROC(hard_smp_processor_id)
#endif
/* End of entry.S */