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| author | Sam Ravnborg <sam@ravnborg.org> | 2008-12-03 12:07:00 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-12-04 18:17:18 +0100 |
| commit | 18269c0fd4db9bec2668f895f21d742486ccb90f (patch) | |
| tree | 2aecdac629ea35c77ec246e838dd9cfdeea02121 /arch/sparc/lib/memscan_32.S | |
| parent | sparc,sparc64: unify prom/ (diff) | |
| download | linux-18269c0fd4db9bec2668f895f21d742486ccb90f.tar.xz linux-18269c0fd4db9bec2668f895f21d742486ccb90f.zip | |
sparc: prepare lib/ for unification
Identical named files renamed to <name>_32.S
Refactored Makefile to prepare for unification.
Linking order was altered slightly - but this is a lib.a file so
it should not matter.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/lib/memscan_32.S')
| -rw-r--r-- | arch/sparc/lib/memscan_32.S | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/arch/sparc/lib/memscan_32.S b/arch/sparc/lib/memscan_32.S new file mode 100644 index 000000000000..4ff1657dfc24 --- /dev/null +++ b/arch/sparc/lib/memscan_32.S @@ -0,0 +1,133 @@ +/* + * memscan.S: Optimized memscan for the Sparc. + * + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + */ + +/* In essence, this is just a fancy strlen. */ + +#define LO_MAGIC 0x01010101 +#define HI_MAGIC 0x80808080 + + .text + .align 4 + .globl __memscan_zero, __memscan_generic + .globl memscan +__memscan_zero: + /* %o0 = addr, %o1 = size */ + cmp %o1, 0 + bne,a 1f + andcc %o0, 3, %g0 + + retl + nop + +1: + be mzero_scan_word + sethi %hi(HI_MAGIC), %g2 + + ldsb [%o0], %g3 +mzero_still_not_word_aligned: + cmp %g3, 0 + bne 1f + add %o0, 1, %o0 + + retl + sub %o0, 1, %o0 + +1: + subcc %o1, 1, %o1 + bne,a 1f + andcc %o0, 3, %g0 + + retl + nop + +1: + bne,a mzero_still_not_word_aligned + ldsb [%o0], %g3 + + sethi %hi(HI_MAGIC), %g2 +mzero_scan_word: + or %g2, %lo(HI_MAGIC), %o3 + sethi %hi(LO_MAGIC), %g3 + or %g3, %lo(LO_MAGIC), %o2 +mzero_next_word: + ld [%o0], %g2 +mzero_next_word_preloaded: + sub %g2, %o2, %g2 +mzero_next_word_preloaded_next: + andcc %g2, %o3, %g0 + bne mzero_byte_zero + add %o0, 4, %o0 + +mzero_check_out_of_fuel: + subcc %o1, 4, %o1 + bg,a 1f + ld [%o0], %g2 + + retl + nop + +1: + b mzero_next_word_preloaded_next + sub %g2, %o2, %g2 + + /* Check every byte. */ +mzero_byte_zero: + ldsb [%o0 - 4], %g2 + cmp %g2, 0 + bne mzero_byte_one + sub %o0, 4, %g3 + + retl + mov %g3, %o0 + +mzero_byte_one: + ldsb [%o0 - 3], %g2 + cmp %g2, 0 + bne,a mzero_byte_two_and_three + ldsb [%o0 - 2], %g2 + + retl + sub %o0, 3, %o0 + +mzero_byte_two_and_three: + cmp %g2, 0 + bne,a 1f + ldsb [%o0 - 1], %g2 + + retl + sub %o0, 2, %o0 + +1: + cmp %g2, 0 + bne,a mzero_next_word_preloaded + ld [%o0], %g2 + + retl + sub %o0, 1, %o0 + +mzero_found_it: + retl + sub %o0, 2, %o0 + +memscan: +__memscan_generic: + /* %o0 = addr, %o1 = c, %o2 = size */ + cmp %o2, 0 + bne,a 0f + ldub [%o0], %g2 + + b,a 2f +1: + ldub [%o0], %g2 +0: + cmp %g2, %o1 + be 2f + addcc %o2, -1, %o2 + bne 1b + add %o0, 1, %o0 +2: + retl + nop |