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.set noreorder
.include "hwregs_a.h"
.section .text
.global DrawSync
.type DrawSync, @function
DrawSync:
bnez $a0, .Lgetwords
lui $a0, IOBASE
addiu $sp, -4
sw $ra, 0($sp)
jal ReadGPUstat # Check if DMA enabled
nop
srl $v0, 29
andi $v0, 0x3
beqz $v0, .Lsimple_wait
nop
.Ldma_wait:
lw $v0, D2_CHCR($a0)
nop
srl $v0, 24
andi $v0, 0x1
bnez $v0, .Ldma_wait
nop
.Lgpu_wait:
jal ReadGPUstat
nop
srl $v0, 26
andi $v0, 0x5
bne $v0, 5, .Lgpu_wait
nop
b .Lexit
nop
.Lsimple_wait: # Wait for GPU to be ready for next DMA
jal ReadGPUstat
nop
srl $v0, 28
andi $v0, 0x1
beqz $v0, .Lsimple_wait
nop
.Lexit:
lw $ra, 0($sp)
addiu $sp, 4
jr $ra
nop
.Lgetwords:
lw $v0, D2_BCR($a0)
nop
jr $ra
srl $v0, 16
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