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977c4b20b5
MISRA C required that return value should be used, missing for it should add "(void)" prefix before the function call. Some function can be declared without return value to avoid this problem. Signed-off-by: Huihuang Shi <huihuang.shi@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef SPINLOCK_H
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#define SPINLOCK_H
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#ifndef ASSEMBLER
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#include <types.h>
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/** The architecture dependent spinlock type. */
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typedef struct _spinlock {
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uint32_t head;
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uint32_t tail;
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} spinlock_t;
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/* Function prototypes */
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void spinlock_init(spinlock_t *lock);
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void spinlock_obtain(spinlock_t *lock);
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static inline void spinlock_release(spinlock_t *lock)
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{
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/* Increment tail of queue */
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asm volatile (" lock incl %[tail]\n"
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:
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: [tail] "m" (lock->tail)
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: "cc", "memory");
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}
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#else /* ASSEMBLER */
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/** The offset of the head element. */
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#define SYNC_SPINLOCK_HEAD_OFFSET 0
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/** The offset of the tail element. */
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#define SYNC_SPINLOCK_TAIL_OFFSET 4
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.macro spinlock_obtain lock
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movl $1, % eax
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lea \lock, % rbx
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lock xaddl % eax, SYNC_SPINLOCK_HEAD_OFFSET(%rbx)
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cmpl % eax, SYNC_SPINLOCK_TAIL_OFFSET(%rbx)
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jz 1f
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2 :
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pause
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cmpl % eax, SYNC_SPINLOCK_TAIL_OFFSET(%rbx)
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jnz 2b
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1 :
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.endm
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#define spinlock_obtain(x) spinlock_obtain lock = (x)
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.macro spinlock_release lock
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lea \lock, % rbx
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lock incl SYNC_SPINLOCK_TAIL_OFFSET(%rbx)
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.endm
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#define spinlock_release(x) spinlock_release lock = (x)
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#endif /* ASSEMBLER */
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#define spinlock_rflags unsigned long cpu_int_value
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#define spinlock_irqsave_obtain(l) \
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do { \
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CPU_INT_ALL_DISABLE(); \
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spinlock_obtain((l)); \
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} while (0)
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#define spinlock_irqrestore_release(l) \
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do { \
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spinlock_release((l)); \
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CPU_INT_ALL_RESTORE(); \
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} while (0)
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#endif /* SPINLOCK_H */
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