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| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * memscan.S: Optimized memscan for Sparc64.
| *
| * Copyright (C) 1997,1998 Jakub Jelinek (jj@ultra.linux.cz)
| * Copyright (C) 1998 David S. Miller (davem@redhat.com)
| */
|
| #include <asm/export.h>
|
| #define HI_MAGIC 0x8080808080808080
| #define LO_MAGIC 0x0101010101010101
| #define ASI_PL 0x88
|
| .text
| .align 32
| .globl __memscan_zero, __memscan_generic
| .type __memscan_zero,#function
| .type __memscan_generic,#function
| .globl memscan
| EXPORT_SYMBOL(__memscan_zero)
| EXPORT_SYMBOL(__memscan_generic)
|
| __memscan_zero:
| /* %o0 = bufp, %o1 = size */
| brlez,pn %o1, szzero
| andcc %o0, 7, %g0
| be,pt %icc, we_are_aligned
| sethi %hi(HI_MAGIC), %o4
| ldub [%o0], %o5
| 1: subcc %o1, 1, %o1
| brz,pn %o5, 10f
| add %o0, 1, %o0
|
| be,pn %xcc, szzero
| andcc %o0, 7, %g0
| bne,a,pn %icc, 1b
| ldub [%o0], %o5
| we_are_aligned:
| ldxa [%o0] ASI_PL, %o5
| or %o4, %lo(HI_MAGIC), %o3
| sllx %o3, 32, %o4
| or %o4, %o3, %o3
|
| srlx %o3, 7, %o2
| msloop:
| sub %o1, 8, %o1
| add %o0, 8, %o0
| sub %o5, %o2, %o4
| xor %o4, %o5, %o4
| andcc %o4, %o3, %g3
| bne,pn %xcc, check_bytes
| srlx %o4, 32, %g3
|
| brgz,a,pt %o1, msloop
| ldxa [%o0] ASI_PL, %o5
| check_bytes:
| bne,a,pn %icc, 2f
| andcc %o5, 0xff, %g0
| add %o0, -5, %g2
| ba,pt %xcc, 3f
| srlx %o5, 32, %g7
|
| 2: srlx %o5, 8, %g7
| be,pn %icc, 1f
| add %o0, -8, %g2
| andcc %g7, 0xff, %g0
| srlx %g7, 8, %g7
| be,pn %icc, 1f
| inc %g2
| andcc %g7, 0xff, %g0
|
| srlx %g7, 8, %g7
| be,pn %icc, 1f
| inc %g2
| andcc %g7, 0xff, %g0
| srlx %g7, 8, %g7
| be,pn %icc, 1f
| inc %g2
| andcc %g3, %o3, %g0
|
| be,a,pn %icc, 2f
| mov %o0, %g2
| 3: andcc %g7, 0xff, %g0
| srlx %g7, 8, %g7
| be,pn %icc, 1f
| inc %g2
| andcc %g7, 0xff, %g0
| srlx %g7, 8, %g7
|
| be,pn %icc, 1f
| inc %g2
| andcc %g7, 0xff, %g0
| srlx %g7, 8, %g7
| be,pn %icc, 1f
| inc %g2
| andcc %g7, 0xff, %g0
| srlx %g7, 8, %g7
|
| be,pn %icc, 1f
| inc %g2
| 2: brgz,a,pt %o1, msloop
| ldxa [%o0] ASI_PL, %o5
| inc %g2
| 1: add %o0, %o1, %o0
| cmp %g2, %o0
| retl
|
| movle %xcc, %g2, %o0
| 10: retl
| sub %o0, 1, %o0
| szzero: retl
| nop
|
| memscan:
| __memscan_generic:
| /* %o0 = addr, %o1 = c, %o2 = size */
| brz,pn %o2, 3f
| add %o0, %o2, %o3
| ldub [%o0], %o5
| sub %g0, %o2, %o4
| 1:
| cmp %o5, %o1
| be,pn %icc, 2f
| addcc %o4, 1, %o4
| bne,a,pt %xcc, 1b
| ldub [%o3 + %o4], %o5
| retl
| /* The delay slot is the same as the next insn, this is just to make it look more awful */
| 2:
| add %o3, %o4, %o0
| retl
| sub %o0, 1, %o0
| 3:
| retl
| nop
|
|
