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