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/* SPDX-License-Identifier: GPL-2.0-only / / * Copyright (C) 2014 Regents of the University of California / #ifndef _ASM_RISCV_CMPXCHG_H #define _ASM_RISCV_CMPXCHG_H #include <linux/bug.h> #include <asm/barrier.h> #include <asm/fence.h> #define __xchg_relaxed(ptr, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__((ptr)) __ret; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ " amoswap.w %0, %2, %1\n" \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ " amoswap.d %0, %2, %1\n" \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define xchg_relaxed(ptr, x) \ ({ \ __typeof__((ptr)) _x_ = (x); \ (__typeof__((ptr))) __xchg_relaxed((ptr), \ _x_, sizeof((ptr))); \ }) #define __xchg_acquire(ptr, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__((ptr)) __ret; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ " amoswap.w %0, %2, %1\n" \ RISCV_ACQUIRE_BARRIER \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ " amoswap.d %0, %2, %1\n" \ RISCV_ACQUIRE_BARRIER \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define xchg_acquire(ptr, x) \ ({ \ __typeof__((ptr)) _x_ = (x); \ (__typeof__((ptr))) __xchg_acquire((ptr), \ _x_, sizeof((ptr))); \ }) #define __xchg_release(ptr, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__((ptr)) __ret; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ RISCV_RELEASE_BARRIER \ " amoswap.w %0, %2, %1\n" \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ RISCV_RELEASE_BARRIER \ " amoswap.d %0, %2, %1\n" \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define xchg_release(ptr, x) \ ({ \ __typeof__((ptr)) _x_ = (x); \ (__typeof__((ptr))) __xchg_release((ptr), \ _x_, sizeof((ptr))); \ }) #define __xchg(ptr, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__((ptr)) __ret; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ " amoswap.w.aqrl %0, %2, %1\n" \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ " amoswap.d.aqrl %0, %2, %1\n" \ : "=r" (__ret), "+A" (__ptr) \ : "r" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define xchg(ptr, x) \ ({ \ __typeof__((ptr)) _x_ = (x); \ (__typeof__((ptr))) __xchg((ptr), _x_, sizeof((ptr))); \ }) #define xchg32(ptr, x) \ ({ \ BUILD_BUG_ON(sizeof((ptr)) != 4); \ xchg((ptr), (x)); \ }) #define xchg64(ptr, x) \ ({ \ BUILD_BUG_ON(sizeof((ptr)) != 8); \ xchg((ptr), (x)); \ }) / * Atomic compare and exchange. Compare OLD with MEM, if identical, * store NEW in MEM. Return the initial value in MEM. Success is * indicated by comparing RETURN with OLD. / #define __cmpxchg_relaxed(ptr, old, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__((ptr)) __old = (old); \ __typeof__((ptr)) __new = (new); \ __typeof__((ptr)) __ret; \ register unsigned int __rc; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ "0: lr.w %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.w %1, %z4, %2\n" \ " bnez %1, 0b\n" \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" ((long)__old), "rJ" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ "0: lr.d %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.d %1, %z4, %2\n" \ " bnez %1, 0b\n" \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" (__old), "rJ" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define cmpxchg_relaxed(ptr, o, n) \ ({ \ __typeof__((ptr)) _o_ = (o); \ __typeof__((ptr)) _n_ = (n); \ (__typeof__((ptr))) __cmpxchg_relaxed((ptr), \ _o_, _n_, sizeof((ptr))); \ }) #define __cmpxchg_acquire(ptr, old, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__((ptr)) __old = (old); \ __typeof__((ptr)) __new = (new); \ __typeof__((ptr)) __ret; \ register unsigned int __rc; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ "0: lr.w %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.w %1, %z4, %2\n" \ " bnez %1, 0b\n" \ RISCV_ACQUIRE_BARRIER \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" ((long)__old), "rJ" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ "0: lr.d %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.d %1, %z4, %2\n" \ " bnez %1, 0b\n" \ RISCV_ACQUIRE_BARRIER \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" (__old), "rJ" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define cmpxchg_acquire(ptr, o, n) \ ({ \ __typeof__((ptr)) _o_ = (o); \ __typeof__((ptr)) _n_ = (n); \ (__typeof__((ptr))) __cmpxchg_acquire((ptr), \ _o_, _n_, sizeof((ptr))); \ }) #define __cmpxchg_release(ptr, old, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__((ptr)) __old = (old); \ __typeof__((ptr)) __new = (new); \ __typeof__((ptr)) __ret; \ register unsigned int __rc; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ RISCV_RELEASE_BARRIER \ "0: lr.w %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.w %1, %z4, %2\n" \ " bnez %1, 0b\n" \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" ((long)__old), "rJ" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ RISCV_RELEASE_BARRIER \ "0: lr.d %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.d %1, %z4, %2\n" \ " bnez %1, 0b\n" \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" (__old), "rJ" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define cmpxchg_release(ptr, o, n) \ ({ \ __typeof__((ptr)) _o_ = (o); \ __typeof__((ptr)) _n_ = (n); \ (__typeof__((ptr))) __cmpxchg_release((ptr), \ _o_, _n_, sizeof((ptr))); \ }) #define __cmpxchg(ptr, old, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__((ptr)) __old = (old); \ __typeof__((ptr)) __new = (new); \ __typeof__((ptr)) __ret; \ register unsigned int __rc; \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ "0: lr.w %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.w.rl %1, %z4, %2\n" \ " bnez %1, 0b\n" \ " fence rw, rw\n" \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" ((long)__old), "rJ" (__new) \ : "memory"); \ break; \ case 8: \ __asm__ __volatile__ ( \ "0: lr.d %0, %2\n" \ " bne %0, %z3, 1f\n" \ " sc.d.rl %1, %z4, %2\n" \ " bnez %1, 0b\n" \ " fence rw, rw\n" \ "1:\n" \ : "=&r" (__ret), "=&r" (__rc), "+A" (__ptr) \ : "rJ" (__old), "rJ" (__new) \ : "memory"); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define cmpxchg(ptr, o, n) \ ({ \ __typeof__((ptr)) _o_ = (o); \ __typeof__((ptr)) _n_ = (n); \ (__typeof__((ptr))) __cmpxchg((ptr), \ _o_, _n_, sizeof((ptr))); \ }) #define cmpxchg_local(ptr, o, n) \ (__cmpxchg_relaxed((ptr), (o), (n), sizeof((ptr)))) #define cmpxchg32(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof((ptr)) != 4); \ cmpxchg((ptr), (o), (n)); \ }) #define cmpxchg32_local(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof((ptr)) != 4); \ cmpxchg_relaxed((ptr), (o), (n)) \ }) #define cmpxchg64(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof((ptr)) != 8); \ cmpxchg((ptr), (o), (n)); \ }) #define cmpxchg64_local(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof((ptr)) != 8); \ cmpxchg_relaxed((ptr), (o), (n)); \ }) #endif /* _ASM_RISCV_CMPXCHG_H */

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