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.set noreorder
.include "hwregs_a.h"
.section .text
.global DrawOTag
.type DrawOTag, @function
DrawOTag:
addiu $sp, -4
sw $ra, 0($sp)
lui $a3, IOBASE # I/O segment base
lui $v0, 0x0400 # Set DMA direction to CPUtoGPU
ori $v0, 0x2
sw $v0, GPU_GP1($a3)
.Lgpu_wait: # Wait for GPU to be ready for commands & DMA
jal ReadGPUstat
nop
srl $v0, 26
andi $v0, 1
beqz $v0, .Lgpu_wait
nop
sw $a0, DMA2_MADR($a3) # Set DMA base address to specified OT
sw $0 , DMA2_BCR($a3)
lui $v0, 0x0100 # Begin OT transfer!
ori $v0, 0x0401
sw $v0, DMA2_CHCR($a3)
lw $ra, 0($sp)
addiu $sp, 4
jr $ra
nop
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