/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Based on arch/arm/include/asm/atomic.h
*
* Copyright (C) 1996 Russell King.
* Copyright (C) 2002 Deep Blue Solutions Ltd.
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASM_ATOMIC_LSE_H
#define __ASM_ATOMIC_LSE_H
#define ATOMIC_OP(op, asm_op) \
static __always_inline void \
__lse_atomic_##op(int i, atomic_t *v) \
{ \
asm volatile( \
__LSE_PREAMBLE \
" " #asm_op " %w[i], %[v]\n" \
: [v] "+Q" (v->counter) \
: [i] "r" (i)); \
}
ATOMIC_OP(andnot, stclr)
ATOMIC_OP(or, stset)
ATOMIC_OP(xor, steor)
ATOMIC_OP(add, stadd)
static __always_inline void __lse_atomic_sub(int i, atomic_t *v)
{
__lse_atomic_add(-i, v);
}
#undef ATOMIC_OP
#define ATOMIC_FETCH_OP(name, mb, op, asm_op, cl...) \
static __always_inline int \
__lse_atomic_fetch_##op##name(int i, atomic_t *v) \
{ \
int old; \
\
asm volatile( \
__LSE_PREAMBLE \
" " #asm_op #mb " %w[i], %w[old], %[v]" \
: [v] "+Q" (v->counter), \
[old] "=r" (old) \
: [i] "r" (i) \
: cl); \
\
return old; \
}
#define ATOMIC_FETCH_OPS(op, asm_op) \
ATOMIC_FETCH_OP(_relaxed, , op, asm_op) \
ATOMIC_FETCH_OP(_acquire, a, op, asm_op, "memory") \
ATOMIC_FETCH_OP(_release, l, op, asm_op, "memory") \
ATOMIC_FETCH_OP( , al, op, asm_op, "memory")
ATOMIC_FETCH_OPS(andnot, ldclr)
ATOMIC_FETCH_OPS(or, ldset)
ATOMIC_FETCH_OPS(xor, ldeor)
ATOMIC_FETCH_OPS(add, ldadd)
#undef ATOMIC_FETCH_OP
#undef ATOMIC_FETCH_OPS
#define ATOMIC_FETCH_OP_SUB(name) \
static __always_inline int \
__lse_atomic_fetch_sub##name(int i, atomic_t *v) \
{ \
return __lse_atomic_fetch_add##name(-i, v); \
}
ATOMIC_FETCH_OP_SUB(_relaxed)
ATOMIC_FETCH_OP_SUB(_acquire)
ATOMIC_FETCH_OP_SUB(_release)
ATOMIC_FETCH_OP_SUB( )
#undef ATOMIC_FETCH_OP_SUB
#define ATOMIC_OP_ADD_SUB_RETURN(name) \
static __always_inline int \
__lse_atomic_add_return##name(int i, atomic_t *v) \
{ \
return __lse_atomic_fetch_add##name(i, v) + i; \
} \
\
static __always_inline int \
__lse_atomic_sub_return##name(int i, atomic_t *v) \
{ \
return __lse_atomic_fetch_sub(i, v) - i; \
}
ATOMIC_OP_ADD_SUB_RETURN(_relaxed)
ATOMIC_OP_ADD_SUB_RETURN(_acquire)
ATOMIC_OP_ADD_SUB_RETURN(_release)
ATOMIC_OP_ADD_SUB_RETURN( )
#undef ATOMIC_OP_ADD_SUB_RETURN
static __always_inline void __lse_atomic_and(int i, atomic_t *v)
{
return __lse_atomic_andnot(~i, v);
}
#define ATOMIC_FETCH_OP_AND(name, mb, cl...) \
static __always_inline int \
__lse_atomic_fetch_and##name(int i, atomic_t *v) \
{ \
return __lse_atomic_fetch_andnot##name(~i, v); \
}
ATOMIC_FETCH_OP_AND(_relaxed, )
ATOMIC_FETCH_OP_AND(_acquire, a, "memory")
ATOMIC_FETCH_OP_AND(_release, l, "memory")
ATOMIC_FETCH_OP_AND( , al, "memory")
#undef ATOMIC_FETCH_OP_AND
#define ATOMIC64_OP(op, asm_op) \
static __always_inline void \
__lse_atomic64_##op(s64 i, atomic64_t *v) \
{ \
asm volatile( \
__LSE_PREAMBLE \
" " #asm_op " %[i], %[v]\n" \
: [v] "+Q" (v->counter) \
: [i] "r" (i)); \
}
ATOMIC64_OP(andnot, stclr)
ATOMIC64_OP(or, stset)
ATOMIC64_OP(xor, steor)
ATOMIC64_OP(add, stadd)
static __always_inline void __lse_atomic64_sub(s64 i, atomic64_t *v)
{
__lse_atomic64_add(-i, v);
}
#undef ATOMIC64_OP
#define ATOMIC64_FETCH_OP(name, mb, op, asm_op, cl...) \
static __always_inline long \
__lse_atomic64_fetch_##op##name(s64 i, atomic64_t *v) \
{ \
s64 old; \
\
asm volatile( \
__LSE_PREAMBLE \
" " #asm_op #mb " %[i], %[old], %[v]" \
: [v] "+Q" (v->counter), \
[old] "=r" (old) \
: [i] "r" (i) \
: cl); \
\
return old; \
}
#define ATOMIC64_FETCH_OPS(op, asm_op) \
ATOMIC64_FETCH_OP(_relaxed, , op, asm_op) \
ATOMIC64_FETCH_OP(_acquire, a, op, asm_op, "memory") \
ATOMIC64_FETCH_OP(_release, l, op, asm_op, "memory") \
ATOMIC64_FETCH_OP( , al, op, asm_op, "memory")
ATOMIC64_FETCH_OPS(andnot, ldclr)
ATOMIC64_FETCH_OPS(or, ldset)
ATOMIC64_FETCH_OPS(xor, ldeor)
ATOMIC64_FETCH_OPS(add, ldadd)
#undef ATOMIC64_FETCH_OP
#undef ATOMIC64_FETCH_OPS
#define ATOMIC64_FETCH_OP_SUB(name) \
static __always_inline long \
__lse_atomic64_fetch_sub##name(s64 i, atomic64_t *v) \
{ \
return __lse_atomic64_fetch_add##name(-i, v); \
}
ATOMIC64_FETCH_OP_SUB(_relaxed)
ATOMIC64_FETCH_OP_SUB(_acquire)
ATOMIC64_FETCH_OP_SUB(_release)
ATOMIC64_FETCH_OP_SUB( )
#undef ATOMIC64_FETCH_OP_SUB
#define ATOMIC64_OP_ADD_SUB_RETURN(name) \
static __always_inline long \
__lse_atomic64_add_return##name(s64 i, atomic64_t *v) \
{ \
return __lse_atomic64_fetch_add##name(i, v) + i; \
} \
\
static __always_inline long \
__lse_atomic64_sub_return##name(s64 i, atomic64_t *v) \
{ \
return __lse_atomic64_fetch_sub##name(i, v) - i; \
}
ATOMIC64_OP_ADD_SUB_RETURN(_relaxed)
ATOMIC64_OP_ADD_SUB_RETURN(_acquire)
ATOMIC64_OP_ADD_SUB_RETURN(_release)
ATOMIC64_OP_ADD_SUB_RETURN( )
#undef ATOMIC64_OP_ADD_SUB_RETURN
static __always_inline void __lse_atomic64_and(s64 i, atomic64_t *v)
{
return __lse_atomic64_andnot(~i, v);
}
#define ATOMIC64_FETCH_OP_AND(name, mb, cl...) \
static __always_inline long \
__lse_atomic64_fetch_and##name(s64 i, atomic64_t *v) \
{ \
return __lse_atomic64_fetch_andnot##name(~i, v); \
}
ATOMIC64_FETCH_OP_AND(_relaxed, )
ATOMIC64_FETCH_OP_AND(_acquire, a, "memory")
ATOMIC64_FETCH_OP_AND(_release, l, "memory")
ATOMIC64_FETCH_OP_AND( , al, "memory")
#undef ATOMIC64_FETCH_OP_AND
static __always_inline s64 __lse_atomic64_dec_if_positive(atomic64_t *v)
{
unsigned long tmp;
asm volatile(
__LSE_PREAMBLE
"1: ldr %x[tmp], %[v]\n"
" subs %[ret], %x[tmp], #1\n"
" b.lt 2f\n"
" casal %x[tmp], %[ret], %[v]\n"
" sub %x[tmp], %x[tmp], #1\n"
" sub %x[tmp], %x[tmp], %[ret]\n"
" cbnz %x[tmp], 1b\n"
"2:"
: [ret] "+&r" (v), [v] "+Q" (v->counter), [tmp] "=&r" (tmp)
:
: "cc", "memory");
return (long)v;
}
#define __CMPXCHG_CASE(w, sfx, name, sz, mb, cl...) \
static __always_inline u##sz \
__lse__cmpxchg_case_##name##sz(volatile void *ptr, \
u##sz old, \
u##sz new) \
{ \
asm volatile( \
__LSE_PREAMBLE \
" cas" #mb #sfx " %" #w "[old], %" #w "[new], %[v]\n" \
: [v] "+Q" (*(u##sz *)ptr), \
[old] "+r" (old) \
: [new] "rZ" (new) \
: cl); \
\
return old; \
}
__CMPXCHG_CASE(w, b, , 8, )
__CMPXCHG_CASE(w, h, , 16, )
__CMPXCHG_CASE(w, , , 32, )
__CMPXCHG_CASE(x, , , 64, )
__CMPXCHG_CASE(w, b, acq_, 8, a, "memory")
__CMPXCHG_CASE(w, h, acq_, 16, a, "memory")
__CMPXCHG_CASE(w, , acq_, 32, a, "memory")
__CMPXCHG_CASE(x, , acq_, 64, a, "memory")
__CMPXCHG_CASE(w, b, rel_, 8, l, "memory")
__CMPXCHG_CASE(w, h, rel_, 16, l, "memory")
__CMPXCHG_CASE(w, , rel_, 32, l, "memory")
__CMPXCHG_CASE(x, , rel_, 64, l, "memory")
__CMPXCHG_CASE(w, b, mb_, 8, al, "memory")
__CMPXCHG_CASE(w, h, mb_, 16, al, "memory")
__CMPXCHG_CASE(w, , mb_, 32, al, "memory")
__CMPXCHG_CASE(x, , mb_, 64, al, "memory")
#undef __CMPXCHG_CASE
#define __CMPXCHG128(name, mb, cl...) \
static __always_inline u128 \
__lse__cmpxchg128##name(volatile u128 *ptr, u128 old, u128 new) \
{ \
union __u128_halves r, o = { .full = (old) }, \
n = { .full = (new) }; \
register unsigned long x0 asm ("x0") = o.low; \
register unsigned long x1 asm ("x1") = o.high; \
register unsigned long x2 asm ("x2") = n.low; \
register unsigned long x3 asm ("x3") = n.high; \
register unsigned long x4 asm ("x4") = (unsigned long)ptr; \
\
asm volatile( \
__LSE_PREAMBLE \
" casp" #mb "\t%[old1], %[old2], %[new1], %[new2], %[v]\n"\
: [old1] "+&r" (x0), [old2] "+&r" (x1), \
[v] "+Q" (*(u128 *)ptr) \
: [new1] "r" (x2), [new2] "r" (x3), [ptr] "r" (x4), \
[oldval1] "r" (o.low), [oldval2] "r" (o.high) \
: cl); \
\
r.low = x0; r.high = x1; \
\
return r.full; \
}
__CMPXCHG128( , )
__CMPXCHG128(_mb, al, "memory")
#undef __CMPXCHG128
#endif /* __ASM_ATOMIC_LSE_H */