| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Adrian Bunk | b00dc83 | 2008-05-19 16:52:27 -0700 | [diff] [blame] | 2 | /* |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * memscan.S: Optimized memscan for Sparc64. |
| 4 | * |
| 5 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@ultra.linux.cz) |
| 6 | * Copyright (C) 1998 David S. Miller (davem@redhat.com) |
| 7 | */ |
| 8 | |
| Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 9 | #include <asm/export.h> |
| 10 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #define HI_MAGIC 0x8080808080808080 |
| 12 | #define LO_MAGIC 0x0101010101010101 |
| 13 | #define ASI_PL 0x88 |
| 14 | |
| 15 | .text |
| 16 | .align 32 |
| 17 | .globl __memscan_zero, __memscan_generic |
| Nagarathnam Muthusamy | f5a651f | 2017-06-19 13:08:50 -0400 | [diff] [blame] | 18 | .type __memscan_zero,#function |
| 19 | .type __memscan_generic,#function |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | .globl memscan |
| Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 21 | EXPORT_SYMBOL(__memscan_zero) |
| 22 | EXPORT_SYMBOL(__memscan_generic) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | __memscan_zero: |
| 25 | /* %o0 = bufp, %o1 = size */ |
| 26 | brlez,pn %o1, szzero |
| 27 | andcc %o0, 7, %g0 |
| 28 | be,pt %icc, we_are_aligned |
| 29 | sethi %hi(HI_MAGIC), %o4 |
| 30 | ldub [%o0], %o5 |
| 31 | 1: subcc %o1, 1, %o1 |
| 32 | brz,pn %o5, 10f |
| 33 | add %o0, 1, %o0 |
| 34 | |
| 35 | be,pn %xcc, szzero |
| 36 | andcc %o0, 7, %g0 |
| 37 | bne,a,pn %icc, 1b |
| 38 | ldub [%o0], %o5 |
| 39 | we_are_aligned: |
| 40 | ldxa [%o0] ASI_PL, %o5 |
| 41 | or %o4, %lo(HI_MAGIC), %o3 |
| 42 | sllx %o3, 32, %o4 |
| 43 | or %o4, %o3, %o3 |
| 44 | |
| 45 | srlx %o3, 7, %o2 |
| 46 | msloop: |
| 47 | sub %o1, 8, %o1 |
| 48 | add %o0, 8, %o0 |
| 49 | sub %o5, %o2, %o4 |
| 50 | xor %o4, %o5, %o4 |
| 51 | andcc %o4, %o3, %g3 |
| 52 | bne,pn %xcc, check_bytes |
| 53 | srlx %o4, 32, %g3 |
| 54 | |
| 55 | brgz,a,pt %o1, msloop |
| 56 | ldxa [%o0] ASI_PL, %o5 |
| 57 | check_bytes: |
| 58 | bne,a,pn %icc, 2f |
| 59 | andcc %o5, 0xff, %g0 |
| 60 | add %o0, -5, %g2 |
| 61 | ba,pt %xcc, 3f |
| 62 | srlx %o5, 32, %g7 |
| 63 | |
| 64 | 2: srlx %o5, 8, %g7 |
| 65 | be,pn %icc, 1f |
| 66 | add %o0, -8, %g2 |
| 67 | andcc %g7, 0xff, %g0 |
| 68 | srlx %g7, 8, %g7 |
| 69 | be,pn %icc, 1f |
| 70 | inc %g2 |
| 71 | andcc %g7, 0xff, %g0 |
| 72 | |
| 73 | srlx %g7, 8, %g7 |
| 74 | be,pn %icc, 1f |
| 75 | inc %g2 |
| 76 | andcc %g7, 0xff, %g0 |
| 77 | srlx %g7, 8, %g7 |
| 78 | be,pn %icc, 1f |
| 79 | inc %g2 |
| 80 | andcc %g3, %o3, %g0 |
| 81 | |
| 82 | be,a,pn %icc, 2f |
| 83 | mov %o0, %g2 |
| 84 | 3: andcc %g7, 0xff, %g0 |
| 85 | srlx %g7, 8, %g7 |
| 86 | be,pn %icc, 1f |
| 87 | inc %g2 |
| 88 | andcc %g7, 0xff, %g0 |
| 89 | srlx %g7, 8, %g7 |
| 90 | |
| 91 | be,pn %icc, 1f |
| 92 | inc %g2 |
| 93 | andcc %g7, 0xff, %g0 |
| 94 | srlx %g7, 8, %g7 |
| 95 | be,pn %icc, 1f |
| 96 | inc %g2 |
| 97 | andcc %g7, 0xff, %g0 |
| 98 | srlx %g7, 8, %g7 |
| 99 | |
| 100 | be,pn %icc, 1f |
| 101 | inc %g2 |
| 102 | 2: brgz,a,pt %o1, msloop |
| 103 | ldxa [%o0] ASI_PL, %o5 |
| 104 | inc %g2 |
| 105 | 1: add %o0, %o1, %o0 |
| 106 | cmp %g2, %o0 |
| 107 | retl |
| 108 | |
| 109 | movle %xcc, %g2, %o0 |
| 110 | 10: retl |
| 111 | sub %o0, 1, %o0 |
| 112 | szzero: retl |
| 113 | nop |
| 114 | |
| 115 | memscan: |
| 116 | __memscan_generic: |
| 117 | /* %o0 = addr, %o1 = c, %o2 = size */ |
| 118 | brz,pn %o2, 3f |
| 119 | add %o0, %o2, %o3 |
| 120 | ldub [%o0], %o5 |
| 121 | sub %g0, %o2, %o4 |
| 122 | 1: |
| 123 | cmp %o5, %o1 |
| 124 | be,pn %icc, 2f |
| 125 | addcc %o4, 1, %o4 |
| 126 | bne,a,pt %xcc, 1b |
| 127 | ldub [%o3 + %o4], %o5 |
| 128 | retl |
| 129 | /* The delay slot is the same as the next insn, this is just to make it look more awful */ |
| 130 | 2: |
| 131 | add %o3, %o4, %o0 |
| 132 | retl |
| 133 | sub %o0, 1, %o0 |
| 134 | 3: |
| 135 | retl |
| 136 | nop |