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[SPARC64]: Add explicit register args to trap state loading macros.

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This, as well as making the code cleaner, allows a simplification in
the TSB miss handling path.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-02-02 21:55:10 -08:00
parent 92704a1c63
commit ffe483d552
6 changed files with 61 additions and 68 deletions
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82
include/asm-sparc64/cpudata.h
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@@ -107,67 +107,67 @@ extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
lduwa [REG] ASI_PHYS_BYPASS_EC_E, REG;\
.previous;
/* Clobbers %g1, current address space PGD phys address into %g7. */
#define TRAP_LOAD_PGD_PHYS \
__GET_CPUID(%g1) \
sethi %hi(trap_block), %g7; \
sllx %g1, TRAP_BLOCK_SZ_SHIFT, %g1; \
or %g7, %lo(trap_block), %g7; \
add %g7, %g1, %g7; \
ldx [%g7 + TRAP_PER_CPU_PGD_PADDR], %g7;
/* Clobbers TMP, current address space PGD phys address into DEST. */
#define TRAP_LOAD_PGD_PHYS(DEST, TMP) \
__GET_CPUID(TMP) \
sethi %hi(trap_block), DEST; \
sllx TMP, TRAP_BLOCK_SZ_SHIFT, TMP; \
or DEST, %lo(trap_block), DEST; \
add DEST, TMP, DEST; \
ldx [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
/* Clobbers %g1, loads local processor's IRQ work area into %g6. */
#define TRAP_LOAD_IRQ_WORK \
__GET_CPUID(%g1) \
sethi %hi(__irq_work), %g6; \
sllx %g1, 6, %g1; \
or %g6, %lo(__irq_work), %g6; \
add %g6, %g1, %g6;
/* Clobbers TMP, loads local processor's IRQ work area into DEST. */
#define TRAP_LOAD_IRQ_WORK(DEST, TMP) \
__GET_CPUID(TMP) \
sethi %hi(__irq_work), DEST; \
sllx TMP, 6, TMP; \
or DEST, %lo(__irq_work), DEST; \
add DEST, TMP, DEST;
/* Clobbers %g1, loads %g6 with current thread info pointer. */
#define TRAP_LOAD_THREAD_REG \
__GET_CPUID(%g1) \
sethi %hi(trap_block), %g6; \
sllx %g1, TRAP_BLOCK_SZ_SHIFT, %g1; \
or %g6, %lo(trap_block), %g6; \
ldx [%g6 + %g1], %g6;
/* Clobbers TMP, loads DEST with current thread info pointer. */
#define TRAP_LOAD_THREAD_REG(DEST, TMP) \
__GET_CPUID(TMP) \
sethi %hi(trap_block), DEST; \
sllx TMP, TRAP_BLOCK_SZ_SHIFT, TMP; \
or DEST, %lo(trap_block), DEST; \
ldx [DEST + TMP], DEST;
/* Given the current thread info pointer in %g6, load the per-cpu
* area base of the current processor into %g5. REG1, REG2, and REG3 are
/* Given the current thread info pointer in THR, load the per-cpu
* area base of the current processor into DEST. REG1, REG2, and REG3 are
* clobbered.
*
* You absolutely cannot use %g5 as a temporary in this code. The
* You absolutely cannot use DEST as a temporary in this code. The
* reason is that traps can happen during execution, and return from
* trap will load the fully resolved %g5 per-cpu base. This can corrupt
* trap will load the fully resolved DEST per-cpu base. This can corrupt
* the calculations done by the macro mid-stream.
*/
#define LOAD_PER_CPU_BASE(REG1, REG2, REG3) \
ldub [%g6 + TI_CPU], REG1; \
#define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3) \
ldub [THR + TI_CPU], REG1; \
sethi %hi(__per_cpu_shift), REG3; \
sethi %hi(__per_cpu_base), REG2; \
ldx [REG3 + %lo(__per_cpu_shift)], REG3; \
ldx [REG2 + %lo(__per_cpu_base)], REG2; \
sllx REG1, REG3, REG3; \
add REG3, REG2, %g5;
add REG3, REG2, DEST;
#else
/* Uniprocessor versions, we know the cpuid is zero. */
#define TRAP_LOAD_PGD_PHYS \
sethi %hi(trap_block), %g7; \
or %g7, %lo(trap_block), %g7; \
ldx [%g7 + TRAP_PER_CPU_PGD_PADDR], %g7;
#define TRAP_LOAD_PGD_PHYS(DEST, TMP) \
sethi %hi(trap_block), DEST; \
or DEST, %lo(trap_block), DEST; \
ldx [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
#define TRAP_LOAD_IRQ_WORK \
sethi %hi(__irq_work), %g6; \
or %g6, %lo(__irq_work), %g6;
#define TRAP_LOAD_IRQ_WORK(DEST, TMP) \
sethi %hi(__irq_work), DEST; \
or DEST, %lo(__irq_work), DEST;
#define TRAP_LOAD_THREAD_REG \
sethi %hi(trap_block), %g6; \
ldx [%g6 + %lo(trap_block)], %g6;
#define TRAP_LOAD_THREAD_REG(DEST, TMP) \
sethi %hi(trap_block), DEST; \
ldx [DEST + %lo(trap_block)], DEST;
/* No per-cpu areas on uniprocessor, so no need to load %g5. */
#define LOAD_PER_CPU_BASE(REG1, REG2, REG3)
/* No per-cpu areas on uniprocessor, so no need to load DEST. */
#define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3)
#endif /* !(CONFIG_SMP) */