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sparc64: Add write_pic() helper.

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It writes the %pic register, keeping mind of processor bugs.

Implement reset_pic() in terms of it.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-11-25 22:27:50 -08:00
parent f9aad60010
commit 456cad8e4e
1 changed files with 5 additions and 4 deletions
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9
arch/sparc/include/asm/system_64.h
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@ -96,11 +96,12 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
* arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
* for more information.
*/
#define reset_pic() \
__asm__ __volatile__("ba,pt %xcc, 99f\n\t" \
#define write_pic(__p) \
__asm__ __volatile__("ba,pt %%xcc, 99f\n\t" \
".align 64\n" \
"99:wr %g0, 0x0, %pic\n\t" \
"rd %pic, %g0")
"99:wr %0, 0x0, %%pic\n\t" \
"rd %%pic, %%g0" : : "r" (__p))
#define reset_pic() write_pic(0)
#ifndef __ASSEMBLY__