mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2025-11-14 02:00:27 +00:00
d22e21f484
Follow multi-arch design, implement the mandatory arch spinlock functions declared in common spinlock.h for risc-v support. Tracked-On: #8803 Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com> Signed-off-by: Haoyu Tang <haoyu.tang@intel.com> Reviewed-by: Yifan Liu <yifan1.liu@intel.com> Acked-by: Wang, Yu1 <yu1.wang@intel.com>
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2023-2025 Intel Corporation.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Authors:
|
|
* Haicheng Li <haicheng.li@intel.com>
|
|
*/
|
|
#ifndef RISCV_LIB_SPINLOCK_H
|
|
#define RISCV_LIB_SPINLOCK_H
|
|
#ifndef ASSEMBLER
|
|
/** The architecture dependent spinlock type. */
|
|
typedef struct _arch_spinlock {
|
|
uint64_t head;
|
|
uint64_t tail;
|
|
} arch_spinlock_t;
|
|
|
|
static inline void arch_spinlock_obtain(arch_spinlock_t *lock)
|
|
{
|
|
asm volatile (" li t0, 0x1\n\t"
|
|
" amoadd.d.aqrl t1, t0, (%[head])\n\t"
|
|
"2: ld t0, (%[tail])\n\t"
|
|
" beq t1, t0, 1f\n\t"
|
|
" j 2b\n\t"
|
|
"1:\n"
|
|
:
|
|
:
|
|
[head] "r"(&lock->head),
|
|
[tail] "r"(&lock->tail)
|
|
: "cc", "memory", "t0", "t1");
|
|
}
|
|
|
|
static inline void arch_spinlock_release(arch_spinlock_t *lock)
|
|
{
|
|
asm volatile (" li t0, 0x1\n\t"
|
|
" amoadd.d.aqrl t1, t0, (%[tail])\n"
|
|
:
|
|
: [tail] "r" (&lock->tail)
|
|
: "cc", "memory", "t0", "t1");
|
|
}
|
|
|
|
#else /* ASSEMBLER */
|
|
/** The offset of the head element. */
|
|
#define SPINLOCK_HEAD_OFFSET 0
|
|
/** The offset of the tail element. */
|
|
#define SPINLOCK_TAIL_OFFSET 8
|
|
|
|
.macro arch_spinlock_obtain lock_arg
|
|
li t0, 0x1
|
|
la t2, \lock_arg
|
|
addi t3, t2, SPINLOCK_HEAD_OFFSET
|
|
amoadd.d.aqrl t1, t0, (t3)
|
|
2: ld t0, SPINLOCK_TAIL_OFFSET(t2)
|
|
beq t1, t0, 1f
|
|
j 2b
|
|
1 :
|
|
.endm
|
|
#define arch_spinlock_obtain(x) arch_spinlock_obtain lock_arg = (x)
|
|
|
|
.macro arch_spinlock_release lock_arg
|
|
li t0, 0x1
|
|
la t2, \lock_arg
|
|
addi t3, t2, SPINLOCK_TAIL_OFFSET
|
|
amoadd.d.aqrl t1, t0, (t3)
|
|
.endm
|
|
|
|
#define arch_spinlock_release(x) arch_spinlock_release lock_arg = (x)
|
|
#endif /* ASSEMBLER */
|
|
#endif /* RISCV_LIB_SPINLOCK_H */
|