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sparc32,leon: added some SMP comments

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Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Hellstrom 2011-04-25 21:43:48 +00:00 committed by David S. Miller
parent 970def654e
commit 5149bed891
2 changed files with 14 additions and 0 deletions
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5
arch/sparc/include/asm/smp_32.h
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@ -135,6 +135,11 @@ static inline int hard_smp_processor_id(void)
__asm__ __volatile__("lda [%g0] ASI_M_VIKING_TMP1, %0\n\t"
"nop; nop" :
"=&r" (cpuid));
- leon
__asm__ __volatile__( "rd %asr17, %0\n\t"
"srl %0, 0x1c, %0\n\t"
"nop\n\t" :
"=&r" (cpuid));
See btfixup.h and btfixupprep.c to understand how a blackbox works.
*/
__asm__ __volatile__("sethi %%hi(___b_hard_smp_processor_id), %0\n\t"

9
arch/sparc/include/asm/winmacro.h
View file

@ -103,6 +103,7 @@
st %scratch, [%cur_reg + TI_W_SAVED];
#ifdef CONFIG_SMP
/* Results of LOAD_CURRENT() after BTFIXUP for SUN4M, SUN4D & LEON (comments) */
#define LOAD_CURRENT4M(dest_reg, idreg) \
rd %tbr, %idreg; \
sethi %hi(current_set), %dest_reg; \
@ -118,6 +119,14 @@
or %dest_reg, %lo(C_LABEL(current_set)), %dest_reg; \
ld [%idreg + %dest_reg], %dest_reg;
#define LOAD_CURRENT_LEON(dest_reg, idreg) \
rd %asr17, %idreg; \
sethi %hi(current_set), %dest_reg; \
srl %idreg, 0x1c, %idreg; \
or %dest_reg, %lo(current_set), %dest_reg; \
sll %idreg, 0x2, %idreg; \
ld [%idreg + %dest_reg], %dest_reg;
/* Blackbox - take care with this... - check smp4m and smp4d before changing this. */
#define LOAD_CURRENT(dest_reg, idreg) \
sethi %hi(___b_load_current), %idreg; \