projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| a71a29de YS |
2 | /* memset.S */ |
| 3 | ||
| 4 | #include <asm/linkage.h> | |
| 5 | ||
| 6 | #if defined(CONFIG_CPU_H8300H) | |
| 7 | .h8300h | |
| 8 | #endif | |
| 9 | #if defined(CONFIG_CPU_H8S) | |
| 10 | .h8300s | |
| 11 | #endif | |
| 12 | .text | |
| 13 | ||
| 14 | .global memset | |
| 15 | .global clear_user | |
| 16 | ||
| 17 | ;;void *memset(*ptr, int c, size_t count) | |
| 18 | ;; ptr = er0 | |
| 19 | ;; c = er1(r1l) | |
| 20 | ;; count = er2 | |
| 21 | memset: | |
| 22 | btst #0,r0l | |
| 23 | beq 2f | |
| 24 | ||
| 25 | ;; odd address | |
| 26 | 1: | |
| 27 | mov.b r1l,@er0 | |
| 28 | adds #1,er0 | |
| 29 | dec.l #1,er2 | |
| 30 | beq 6f | |
| 31 | ||
| 32 | ;; even address | |
| 33 | 2: | |
| 34 | mov.l er2,er3 | |
| 35 | cmp.l #4,er2 | |
| 36 | blo 4f | |
| 37 | ;; count>=4 -> count/4 | |
| 38 | #if defined(CONFIG_CPU_H8300H) | |
| 39 | shlr.l er2 | |
| 40 | shlr.l er2 | |
| 41 | #endif | |
| 42 | #if defined(CONFIG_CPU_H8S) | |
| 43 | shlr.l #2,er2 | |
| 44 | #endif | |
| 45 | ;; byte -> long | |
| 46 | mov.b r1l,r1h | |
| 47 | mov.w r1,e1 | |
| 48 | 3: | |
| 49 | mov.l er1,@er0 | |
| 50 | adds #4,er0 | |
| 51 | dec.l #1,er2 | |
| 52 | bne 3b | |
| 53 | 4: | |
| 54 | ;; count % 4 | |
| 55 | and.b #3,r3l | |
| 56 | beq 6f | |
| 57 | 5: | |
| 58 | mov.b r1l,@er0 | |
| 59 | adds #1,er0 | |
| 60 | dec.b r3l | |
| 61 | bne 5b | |
| 62 | 6: | |
| 63 | rts | |
| 64 | ||
| 65 | clear_user: | |
| 66 | mov.l er1, er2 | |
| 67 | sub.l er1, er1 | |
| 68 | bra memset | |
| 69 | ||
| 70 | .end |