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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/fence.h>
#define __arch_xchg_masked(prepend, append, r, p, n) \
({ \
u32 *__ptr32b = (u32 *)((ulong)(p) & ~0x3); \
ulong __s = ((ulong)(p) & (0x4 - sizeof(*p))) * BITS_PER_BYTE; \
ulong __mask = GENMASK(((sizeof(*p)) * BITS_PER_BYTE) - 1, 0) \
<< __s; \
ulong __newx = (ulong)(n) << __s; \
ulong __retx; \
ulong __rc; \
\
__asm__ __volatile__ ( \
prepend \
"0: lr.w %0, %2\n" \
" and %1, %0, %z4\n" \
" or %1, %1, %z3\n" \
" sc.w %1, %1, %2\n" \
" bnez %1, 0b\n" \
append \
: "=&r" (__retx), "=&r" (__rc), "+A" (*(__ptr32b)) \
: "rJ" (__newx), "rJ" (~__mask) \
: "memory"); \
\
r = (__typeof__(*(p)))((__retx & __mask) >> __s); \
})
#define __arch_xchg(sfx, prepend, append, r, p, n) \
({ \
__asm__ __volatile__ ( \
prepend \
" amoswap" sfx " %0, %2, %1\n" \
append \
: "=r" (r), "+A" (*(p)) \
: "r" (n) \
: "memory"); \
})
#define _arch_xchg(ptr, new, sfx, prepend, append) \
({ \
__typeof__(ptr) __ptr = (ptr); \
__typeof__(*(__ptr)) __new = (new); \
__typeof__(*(__ptr)) __ret; \
\
switch (sizeof(*__ptr)) { \
case 1: \
case 2: \
__arch_xchg_masked(prepend, append, \
__ret, __ptr, __new); \
break; \
case 4: \
__arch_xchg(".w" sfx, prepend, append, \
__ret, __ptr, __new); \
break; \
case 8: \
__arch_xchg(".d" sfx, prepend, append, \
__ret, __ptr, __new); \
break; \
default: \
BUILD_BUG(); \
} \
(__typeof__(*(__ptr)))__ret; \
})
#define arch_xchg_relaxed(ptr, x) \
_arch_xchg(ptr, x, "", "", "")
#define arch_xchg_acquire(ptr, x) \
_arch_xchg(ptr, x, "", "", RISCV_ACQUIRE_BARRIER)
#define arch_xchg_release(ptr, x) \
_arch_xchg(ptr, x, "", RISCV_RELEASE_BARRIER, "")
#define arch_xchg(ptr, x) \
_arch_xchg(ptr, x, ".aqrl", "", "")
#define xchg32(ptr, x) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 4); \
arch_xchg((ptr), (x)); \
})
#define xchg64(ptr, x) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
arch_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 __arch_cmpxchg_masked(sc_sfx, prepend, append, r, p, o, n) \
({ \
u32 *__ptr32b = (u32 *)((ulong)(p) & ~0x3); \
ulong __s = ((ulong)(p) & (0x4 - sizeof(*p))) * BITS_PER_BYTE; \
ulong __mask = GENMASK(((sizeof(*p)) * BITS_PER_BYTE) - 1, 0) \
<< __s; \
ulong __newx = (ulong)(n) << __s; \
ulong __oldx = (ulong)(o) << __s; \
ulong __retx; \
ulong __rc; \
\
__asm__ __volatile__ ( \
prepend \
"0: lr.w %0, %2\n" \
" and %1, %0, %z5\n" \
" bne %1, %z3, 1f\n" \
" and %1, %0, %z6\n" \
" or %1, %1, %z4\n" \
" sc.w" sc_sfx " %1, %1, %2\n" \
" bnez %1, 0b\n" \
append \
"1:\n" \
: "=&r" (__retx), "=&r" (__rc), "+A" (*(__ptr32b)) \
: "rJ" ((long)__oldx), "rJ" (__newx), \
"rJ" (__mask), "rJ" (~__mask) \
: "memory"); \
\
r = (__typeof__(*(p)))((__retx & __mask) >> __s); \
})
#define __arch_cmpxchg(lr_sfx, sc_sfx, prepend, append, r, p, co, o, n) \
({ \
register unsigned int __rc; \
\
__asm__ __volatile__ ( \
prepend \
"0: lr" lr_sfx " %0, %2\n" \
" bne %0, %z3, 1f\n" \
" sc" sc_sfx " %1, %z4, %2\n" \
" bnez %1, 0b\n" \
append \
"1:\n" \
: "=&r" (r), "=&r" (__rc), "+A" (*(p)) \
: "rJ" (co o), "rJ" (n) \
: "memory"); \
})
#define _arch_cmpxchg(ptr, old, new, sc_sfx, prepend, append) \
({ \
__typeof__(ptr) __ptr = (ptr); \
__typeof__(*(__ptr)) __old = (old); \
__typeof__(*(__ptr)) __new = (new); \
__typeof__(*(__ptr)) __ret; \
\
switch (sizeof(*__ptr)) { \
case 1: \
case 2: \
__arch_cmpxchg_masked(sc_sfx, prepend, append, \
__ret, __ptr, __old, __new); \
break; \
case 4: \
__arch_cmpxchg(".w", ".w" sc_sfx, prepend, append, \
__ret, __ptr, (long), __old, __new); \
break; \
case 8: \
__arch_cmpxchg(".d", ".d" sc_sfx, prepend, append, \
__ret, __ptr, /**/, __old, __new); \
break; \
default: \
BUILD_BUG(); \
} \
(__typeof__(*(__ptr)))__ret; \
})
#define arch_cmpxchg_relaxed(ptr, o, n) \
_arch_cmpxchg((ptr), (o), (n), "", "", "")
#define arch_cmpxchg_acquire(ptr, o, n) \
_arch_cmpxchg((ptr), (o), (n), "", "", RISCV_ACQUIRE_BARRIER)
#define arch_cmpxchg_release(ptr, o, n) \
_arch_cmpxchg((ptr), (o), (n), "", RISCV_RELEASE_BARRIER, "")
#define arch_cmpxchg(ptr, o, n) \
_arch_cmpxchg((ptr), (o), (n), ".rl", "", " fence rw, rw\n")
#define arch_cmpxchg_local(ptr, o, n) \
arch_cmpxchg_relaxed((ptr), (o), (n))
#define arch_cmpxchg64(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
arch_cmpxchg((ptr), (o), (n)); \
})
#define arch_cmpxchg64_local(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
arch_cmpxchg_relaxed((ptr), (o), (n)); \
})
#define arch_cmpxchg64_relaxed(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
arch_cmpxchg_relaxed((ptr), (o), (n)); \
})
#define arch_cmpxchg64_acquire(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
arch_cmpxchg_acquire((ptr), (o), (n)); \
})
#define arch_cmpxchg64_release(ptr, o, n) \
({ \
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
arch_cmpxchg_release((ptr), (o), (n)); \
})
#endif /* _ASM_RISCV_CMPXCHG_H */
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