projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| a0ae6280 GR |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. | |
| 3 | ||
| 4 | #include <linux/linkage.h> | |
| 5 | #include <abi/entry.h> | |
| 6 | ||
| 7 | .text | |
| 8 | ||
| 9 | /* | |
| 10 | * int csky_cmpxchg(int oldval, int newval, int *ptr) | |
| 11 | * | |
| 12 | * If *ptr != oldval && return 1, | |
| 13 | * else *ptr = newval return 0. | |
| 14 | */ | |
| a0ae6280 GR |
15 | ENTRY(csky_cmpxchg) |
| 16 | USPTOKSP | |
| 17 | mfcr a3, epc | |
| bf241682 | 18 | addi a3, TRAP0_SIZE |
| a0ae6280 GR |
19 | |
| 20 | subi sp, 8 | |
| 21 | stw a3, (sp, 0) | |
| 22 | mfcr a3, epsr | |
| 23 | stw a3, (sp, 4) | |
| 24 | ||
| 25 | psrset ee | |
| bf241682 | 26 | #ifdef CONFIG_CPU_HAS_LDSTEX |
| a0ae6280 GR |
27 | 1: |
| 28 | ldex a3, (a2) | |
| 29 | cmpne a0, a3 | |
| 30 | bt16 2f | |
| 31 | mov a3, a1 | |
| 32 | stex a3, (a2) | |
| 33 | bez a3, 1b | |
| 34 | 2: | |
| 35 | sync.is | |
| a0ae6280 | 36 | #else |
| a0ae6280 GR |
37 | 1: |
| 38 | ldw a3, (a2) | |
| 39 | cmpne a0, a3 | |
| 40 | bt16 3f | |
| 41 | 2: | |
| 42 | stw a1, (a2) | |
| 43 | 3: | |
| bf241682 | 44 | #endif |
| a0ae6280 GR |
45 | mvc a0 |
| 46 | ldw a3, (sp, 0) | |
| 47 | mtcr a3, epc | |
| 48 | ldw a3, (sp, 4) | |
| 49 | mtcr a3, epsr | |
| 50 | addi sp, 8 | |
| 51 | KSPTOUSP | |
| 52 | rte | |
| 53 | END(csky_cmpxchg) | |
| 54 | ||
| bf241682 | 55 | #ifndef CONFIG_CPU_HAS_LDSTEX |
| a0ae6280 GR |
56 | /* |
| 57 | * Called from tlbmodified exception | |
| 58 | */ | |
| 59 | ENTRY(csky_cmpxchg_fixup) | |
| 60 | mfcr a0, epc | |
| 61 | lrw a1, 2b | |
| 62 | cmpne a1, a0 | |
| 63 | bt 1f | |
| 64 | subi a1, (2b - 1b) | |
| 65 | stw a1, (sp, LSAVE_PC) | |
| 66 | 1: | |
| 67 | rts | |
| 68 | END(csky_cmpxchg_fixup) | |
| 69 | #endif |