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