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.global _internal_cdrom_handler
.set noat
_internal_cdrom_handler:
addi $sp, -112
sw $at, 0($sp)
sw $v0, 4($sp)
sw $v1, 8($sp)
sw $a0, 12($sp)
sw $a1, 16($sp)
sw $a2, 20($sp)
sw $a3, 24($sp)
sw $t0, 28($sp)
sw $t1, 32($sp)
sw $t2, 36($sp)
sw $t3, 40($sp)
sw $t4, 44($sp)
sw $t5, 48($sp)
sw $t6, 52($sp)
sw $t7, 56($sp)
sw $s0, 60($sp)
sw $s1, 64($sp)
sw $s2, 68($sp)
sw $s3, 72($sp)
sw $s4, 76($sp)
sw $s5, 80($sp)
sw $s6, 84($sp)
sw $s7, 88($sp)
sw $t8, 92($sp)
sw $t9, 96($sp)
sw $gp, 100($sp)
sw $s8, 104($sp)
sw $ra, 108($sp)
# Do not run code if cdrom interrupt is not enabled
li $t0, 0x1f801074
lw $t1, 0($t0)
andi $t1, $t1, 4
beq $t1, $zero, cdrom_handler_end
nop
# Do not run code if cdrom interrupt is not pending
li $t0, 0x1f801070
lw $t1, 0($t0)
andi $t1, $t1, 4
beq $t1, $zero, cdrom_handler_end
nop
# If the CDROM command isn't direct
# (direct = sent by us and not by the BIOS' ISO9660 routines)
# exit and let the BIOS do its work.
cdrom_check_direct_cmd:
la $t0, cdrom_command_direct
lw $t1, 0($t0)
beq $t1, $zero, cdrom_handler_end
nop
cdrom_fire_user_handler:
la $t0, cdrom_handler_callback
lw $t1, 0($t0)
jalr $t1
nop
# Remove bit for CDROM interrupt (bit 2) from pending interrupts mask.
cdrom_handler_remove_pending:
li $t0, 0x1f801070
lw $t1, 0($t0)
xori $t1, $t1, 4
sw $t1, 0($t0)
cdrom_handler_end:
lw $at, 0($sp)
lw $v0, 4($sp)
lw $v1, 8($sp)
lw $a0, 12($sp)
lw $a1, 16($sp)
lw $a2, 20($sp)
lw $a3, 24($sp)
lw $t0, 28($sp)
lw $t1, 32($sp)
lw $t2, 36($sp)
lw $t3, 40($sp)
lw $t4, 44($sp)
lw $t5, 48($sp)
lw $t6, 52($sp)
lw $t7, 56($sp)
lw $s0, 60($sp)
lw $s1, 64($sp)
lw $s2, 68($sp)
lw $s3, 72($sp)
lw $s4, 76($sp)
lw $s5, 80($sp)
lw $s6, 84($sp)
lw $s7, 88($sp)
lw $t8, 92($sp)
lw $t9, 96($sp)
lw $gp, 100($sp)
lw $s8, 104($sp)
lw $ra, 108($sp)
addi $sp, 112
jr $ra
nop
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