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71 lines
1.2 KiB
ArmAsm
71 lines
1.2 KiB
ArmAsm
# https://en.wikipedia.org/wiki/Spinlock
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.text
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# void SpinLock_Lock(volatile uint64_t *LockData)
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.global SpinLock_Lock
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# void SpinLock_Unlock(volatile uint64_t *LockData)
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.global SpinLock_Unlock
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# uint64_t SpinLock_CheckAndLock(volatile uint64_t *LockData)
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.global SpinLock_CheckAndLock
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# uint64_t SpinLock_WithTimeout(volatile uint64_t *LockData, volatile uint64_t Iterations)
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.global SpinLock_WithTimeout
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# DeadLockHandler(volatile <struct> *LockStructure)
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.extern DeadLockHandler
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SpinLock_Lock:
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xorq %rax,%rax
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lock btsl $0,(%rdi)
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jc Spin
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ret
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Spin:
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incq %rax
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cmpq $0x10000000,%rax
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je Deadlock
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pause
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testl $1,(%rdi)
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jnz Spin
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jmp SpinLock_Lock
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SpinLock_Unlock:
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lock btrl $0,(%rdi)
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ret
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Deadlock:
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pushq %rdi
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pushq %rdi
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xorq %rax,%rax
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call DeadLockHandler
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popq %rdi
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popq %rdi
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jmp Spin
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SpinLock_CheckAndLock:
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xorl %eax,%eax
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lock btsl $0,(%rdi)
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setcb %al
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ret
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SpinLock_WithTimeout:
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xorq %rax,%rax
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SpinTimeout:
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incq %rax
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lock btsl $0,(%rdi)
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setcb %bl
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cmpb $0,%bl
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je LockAquired
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cmpq %rsi,%rax
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je LockTimedOut
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pause
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jmp SpinTimeout
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LockAquired:
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movq $1,%rax
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ret
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LockTimedOut:
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xorq %rax,%rax
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ret
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