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25 lines
490 B
ArmAsm
25 lines
490 B
ArmAsm
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.section .text.init
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.globl rvtest_entry_point
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rvtest_entry_point:
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la a0, lock
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spinlock: # address of lock is in a0
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lr.w t0, (a0) # read the lock
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bnez t0, retry # spin until free
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li t1, 1
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sc.w t0, t1, (a0) # try to write a 1 to take lock
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bnez t0, retry # spin until successful
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ret # got the lock!
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retry: # no lock yet
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pause # pause hint to reduce spin power
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j spinlock # try again
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self_loop:
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j self_loop
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.data
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lock:
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.word 1
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