| Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 Atmel Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | #include <linux/linkage.h> |
| 9 | |
| 10 | .text |
| 11 | /* |
| 12 | * unsigned long find_first_zero_bit(const unsigned long *addr, |
| 13 | * unsigned long size) |
| 14 | */ |
| 15 | ENTRY(find_first_zero_bit) |
| 16 | cp.w r11, 0 |
| 17 | reteq r11 |
| 18 | mov r9, r11 |
| 19 | 1: ld.w r8, r12[0] |
| 20 | com r8 |
| 21 | brne .L_found |
| 22 | sub r12, -4 |
| 23 | sub r9, 32 |
| 24 | brgt 1b |
| 25 | retal r11 |
| 26 | |
| 27 | /* |
| 28 | * unsigned long find_next_zero_bit(const unsigned long *addr, |
| 29 | * unsigned long size, |
| 30 | * unsigned long offset) |
| 31 | */ |
| 32 | ENTRY(find_next_zero_bit) |
| 33 | lsr r8, r10, 5 |
| 34 | sub r9, r11, r10 |
| 35 | retle r11 |
| 36 | |
| 37 | lsl r8, 2 |
| 38 | add r12, r8 |
| 39 | andl r10, 31, COH |
| 40 | breq 1f |
| 41 | |
| 42 | /* offset is not word-aligned. Handle the first (32 - r10) bits */ |
| 43 | ld.w r8, r12[0] |
| 44 | com r8 |
| 45 | sub r12, -4 |
| 46 | lsr r8, r8, r10 |
| 47 | brne .L_found |
| 48 | |
| 49 | /* r9 = r9 - (32 - r10) = r9 + r10 - 32 */ |
| 50 | add r9, r10 |
| 51 | sub r9, 32 |
| 52 | retle r11 |
| 53 | |
| 54 | /* Main loop. offset must be word-aligned */ |
| 55 | 1: ld.w r8, r12[0] |
| 56 | com r8 |
| 57 | brne .L_found |
| 58 | sub r12, -4 |
| 59 | sub r9, 32 |
| 60 | brgt 1b |
| 61 | retal r11 |
| 62 | |
| 63 | /* Common return path for when a bit is actually found. */ |
| 64 | .L_found: |
| 65 | brev r8 |
| 66 | clz r10, r8 |
| 67 | rsub r9, r11 |
| 68 | add r10, r9 |
| 69 | |
| 70 | /* XXX: If we don't have to return exactly "size" when the bit |
| 71 | is not found, we may drop this "min" thing */ |
| 72 | min r12, r11, r10 |
| 73 | retal r12 |
| 74 | |
| 75 | /* |
| 76 | * unsigned long find_first_bit(const unsigned long *addr, |
| 77 | * unsigned long size) |
| 78 | */ |
| 79 | ENTRY(find_first_bit) |
| 80 | cp.w r11, 0 |
| 81 | reteq r11 |
| 82 | mov r9, r11 |
| 83 | 1: ld.w r8, r12[0] |
| 84 | cp.w r8, 0 |
| 85 | brne .L_found |
| 86 | sub r12, -4 |
| 87 | sub r9, 32 |
| 88 | brgt 1b |
| 89 | retal r11 |
| 90 | |
| 91 | /* |
| 92 | * unsigned long find_next_bit(const unsigned long *addr, |
| 93 | * unsigned long size, |
| 94 | * unsigned long offset) |
| 95 | */ |
| 96 | ENTRY(find_next_bit) |
| 97 | lsr r8, r10, 5 |
| 98 | sub r9, r11, r10 |
| 99 | retle r11 |
| 100 | |
| 101 | lsl r8, 2 |
| 102 | add r12, r8 |
| 103 | andl r10, 31, COH |
| 104 | breq 1f |
| 105 | |
| 106 | /* offset is not word-aligned. Handle the first (32 - r10) bits */ |
| 107 | ld.w r8, r12[0] |
| 108 | sub r12, -4 |
| 109 | lsr r8, r8, r10 |
| 110 | brne .L_found |
| 111 | |
| 112 | /* r9 = r9 - (32 - r10) = r9 + r10 - 32 */ |
| 113 | add r9, r10 |
| 114 | sub r9, 32 |
| 115 | retle r11 |
| 116 | |
| 117 | /* Main loop. offset must be word-aligned */ |
| 118 | 1: ld.w r8, r12[0] |
| 119 | cp.w r8, 0 |
| 120 | brne .L_found |
| 121 | sub r12, -4 |
| 122 | sub r9, 32 |
| 123 | brgt 1b |
| 124 | retal r11 |
| 125 | |
| 126 | ENTRY(generic_find_next_zero_le_bit) |
| 127 | lsr r8, r10, 5 |
| 128 | sub r9, r11, r10 |
| 129 | retle r11 |
| 130 | |
| 131 | lsl r8, 2 |
| 132 | add r12, r8 |
| 133 | andl r10, 31, COH |
| 134 | breq 1f |
| 135 | |
| 136 | /* offset is not word-aligned. Handle the first (32 - r10) bits */ |
| 137 | ldswp.w r8, r12[0] |
| 138 | sub r12, -4 |
| Haavard Skinnemoen | 168c8fa | 2006-10-31 20:01:11 +0100 | [diff] [blame] | 139 | com r8 |
| Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 140 | lsr r8, r8, r10 |
| 141 | brne .L_found |
| 142 | |
| 143 | /* r9 = r9 - (32 - r10) = r9 + r10 - 32 */ |
| 144 | add r9, r10 |
| 145 | sub r9, 32 |
| 146 | retle r11 |
| 147 | |
| 148 | /* Main loop. offset must be word-aligned */ |
| 149 | 1: ldswp.w r8, r12[0] |
| Haavard Skinnemoen | 168c8fa | 2006-10-31 20:01:11 +0100 | [diff] [blame] | 150 | com r8 |
| Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 151 | brne .L_found |
| 152 | sub r12, -4 |
| 153 | sub r9, 32 |
| 154 | brgt 1b |
| 155 | retal r11 |