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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
| commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
| tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/csky/include/asm/cmpxchg.h | |
| parent | Initial commit. (diff) | |
| download | linux-upstream.tar.xz linux-upstream.zip | |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/csky/include/asm/cmpxchg.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/csky/include/asm/cmpxchg.h b/arch/csky/include/asm/cmpxchg.h new file mode 100644 index 000000000..89224530a --- /dev/null +++ b/arch/csky/include/asm/cmpxchg.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASM_CSKY_CMPXCHG_H +#define __ASM_CSKY_CMPXCHG_H + +#ifdef CONFIG_CPU_HAS_LDSTEX +#include <asm/barrier.h> + +extern void __bad_xchg(void); + +#define __xchg(new, ptr, size) \ +({ \ + __typeof__(ptr) __ptr = (ptr); \ + __typeof__(new) __new = (new); \ + __typeof__(*(ptr)) __ret; \ + unsigned long tmp; \ + switch (size) { \ + case 4: \ + smp_mb(); \ + asm volatile ( \ + "1: ldex.w %0, (%3) \n" \ + " mov %1, %2 \n" \ + " stex.w %1, (%3) \n" \ + " bez %1, 1b \n" \ + : "=&r" (__ret), "=&r" (tmp) \ + : "r" (__new), "r"(__ptr) \ + :); \ + smp_mb(); \ + break; \ + default: \ + __bad_xchg(); \ + } \ + __ret; \ +}) + +#define xchg(ptr, x) (__xchg((x), (ptr), sizeof(*(ptr)))) + +#define __cmpxchg(ptr, old, new, size) \ +({ \ + __typeof__(ptr) __ptr = (ptr); \ + __typeof__(new) __new = (new); \ + __typeof__(new) __tmp; \ + __typeof__(old) __old = (old); \ + __typeof__(*(ptr)) __ret; \ + switch (size) { \ + case 4: \ + smp_mb(); \ + asm volatile ( \ + "1: ldex.w %0, (%3) \n" \ + " cmpne %0, %4 \n" \ + " bt 2f \n" \ + " mov %1, %2 \n" \ + " stex.w %1, (%3) \n" \ + " bez %1, 1b \n" \ + "2: \n" \ + : "=&r" (__ret), "=&r" (__tmp) \ + : "r" (__new), "r"(__ptr), "r"(__old) \ + :); \ + smp_mb(); \ + break; \ + default: \ + __bad_xchg(); \ + } \ + __ret; \ +}) + +#define cmpxchg(ptr, o, n) \ + (__cmpxchg((ptr), (o), (n), sizeof(*(ptr)))) +#else +#include <asm-generic/cmpxchg.h> +#endif + +#endif /* __ASM_CSKY_CMPXCHG_H */ |