stage2.S

/* $s2: origin */

la      $s0, 0x80120000
/* create a vi message queue */
addiu   $a0, $sp, 0x0010  /* mq */
addiu   $a1, $sp, 0x0028  /* msg */
la      $a2, 1
/* hijack vi event from audio thread */
sw      $a0, 0x0180($s0)  /* mq_list.mq for audio irq */
jal     0x80004220        /* osCreateMesgQueue(mq, msg, 1) */

.Lloop:
/* wait for vertical retrace */
addiu   $a0, $sp, 0x0010  /* mq */
la      $a1, 0
/* $a2 is not clobbered by osCreateMesgQueue or osRecvMesg, so reuse it */
jal     0x80002030        /* osRecvMesg(mq, NULL, OS_MESG_BLOCK) */
/* copy controller data */
lw      $t0, -0x28D0($s0) /* z64_input_direct[0].raw */
lhu     $t1, -0x289E($s0) /* z64_input_direct[2].raw.x / y */
sh      $t0, 0x003C($s2)
sh      $t1, 0x003E($s2)
addiu   $s2, $s2, 0x0004
bne     $t0, $zero, .Lloop