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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Atomic operations.
*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_ATOMIC_H
#define _ASM_ATOMIC_H
#include <linux/types.h>
#include <asm/barrier.h>
#include <asm/cmpxchg.h>
#ifdef CONFIG_CPU_HAS_AMO
#include <asm/atomic-amo.h>
#else
#include <asm/atomic-llsc.h>
#endif
#ifdef CONFIG_GENERIC_ATOMIC64
#include <asm-generic/atomic64.h>
#endif
#if __SIZEOF_LONG__ == 4
#define __LL "ll.w "
#define __SC "sc.w "
#define __AMADD "amadd.w "
#define __AMOR "amor.w "
#define __AMAND_DB "amand_db.w "
#define __AMOR_DB "amor_db.w "
#define __AMXOR_DB "amxor_db.w "
#elif __SIZEOF_LONG__ == 8
#define __LL "ll.d "
#define __SC "sc.d "
#define __AMADD "amadd.d "
#define __AMOR "amor.d "
#define __AMAND_DB "amand_db.d "
#define __AMOR_DB "amor_db.d "
#define __AMXOR_DB "amxor_db.d "
#endif
#define ATOMIC_INIT(i) { (i) }
#define arch_atomic_read(v) READ_ONCE((v)->counter)
#define arch_atomic_set(v, i) WRITE_ONCE((v)->counter, (i))
static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u)
{
int prev, rc;
__asm__ __volatile__ (
"0: ll.w %[p], %[c]\n"
" beq %[p], %[u], 1f\n"
" add.w %[rc], %[p], %[a]\n"
" sc.w %[rc], %[c]\n"
" beqz %[rc], 0b\n"
" b 2f\n"
"1:\n"
__WEAK_LLSC_MB
"2:\n"
: [p]"=&r" (prev), [rc]"=&r" (rc),
[c]"=ZB" (v->counter)
: [a]"r" (a), [u]"r" (u)
: "memory");
return prev;
}
#define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless
static inline int arch_atomic_sub_if_positive(int i, atomic_t *v)
{
int result;
int temp;
if (__builtin_constant_p(i)) {
__asm__ __volatile__(
"1: ll.w %1, %2 # atomic_sub_if_positive\n"
" addi.w %0, %1, %3 \n"
" move %1, %0 \n"
" bltz %0, 2f \n"
" sc.w %1, %2 \n"
" beqz %1, 1b \n"
"2: \n"
__WEAK_LLSC_MB
: "=&r" (result), "=&r" (temp), "+ZC" (v->counter)
: "I" (-i));
} else {
__asm__ __volatile__(
"1: ll.w %1, %2 # atomic_sub_if_positive\n"
" sub.w %0, %1, %3 \n"
" move %1, %0 \n"
" bltz %0, 2f \n"
" sc.w %1, %2 \n"
" beqz %1, 1b \n"
"2: \n"
__WEAK_LLSC_MB
: "=&r" (result), "=&r" (temp), "+ZC" (v->counter)
: "r" (i));
}
return result;
}
#define arch_atomic_dec_if_positive(v) arch_atomic_sub_if_positive(1, v)
#ifdef CONFIG_64BIT
#define ATOMIC64_INIT(i) { (i) }
#define arch_atomic64_read(v) READ_ONCE((v)->counter)
#define arch_atomic64_set(v, i) WRITE_ONCE((v)->counter, (i))
static inline long arch_atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
{
long prev, rc;
__asm__ __volatile__ (
"0: ll.d %[p], %[c]\n"
" beq %[p], %[u], 1f\n"
" add.d %[rc], %[p], %[a]\n"
" sc.d %[rc], %[c]\n"
" beqz %[rc], 0b\n"
" b 2f\n"
"1:\n"
__WEAK_LLSC_MB
"2:\n"
: [p]"=&r" (prev), [rc]"=&r" (rc),
[c] "=ZB" (v->counter)
: [a]"r" (a), [u]"r" (u)
: "memory");
return prev;
}
#define arch_atomic64_fetch_add_unless arch_atomic64_fetch_add_unless
static inline long arch_atomic64_sub_if_positive(long i, atomic64_t *v)
{
long result;
long temp;
if (__builtin_constant_p(i)) {
__asm__ __volatile__(
"1: ll.d %1, %2 # atomic64_sub_if_positive \n"
" addi.d %0, %1, %3 \n"
" move %1, %0 \n"
" bltz %0, 2f \n"
" sc.d %1, %2 \n"
" beqz %1, 1b \n"
"2: \n"
__WEAK_LLSC_MB
: "=&r" (result), "=&r" (temp), "+ZC" (v->counter)
: "I" (-i));
} else {
__asm__ __volatile__(
"1: ll.d %1, %2 # atomic64_sub_if_positive \n"
" sub.d %0, %1, %3 \n"
" move %1, %0 \n"
" bltz %0, 2f \n"
" sc.d %1, %2 \n"
" beqz %1, 1b \n"
"2: \n"
__WEAK_LLSC_MB
: "=&r" (result), "=&r" (temp), "+ZC" (v->counter)
: "r" (i));
}
return result;
}
#define arch_atomic64_dec_if_positive(v) arch_atomic64_sub_if_positive(1, v)
#endif /* CONFIG_64BIT */
#endif /* _ASM_ATOMIC_H */
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