Imported pristine psxsdk-20190410 from official repo

1 files changed, 109 insertions, 0 deletions

diff --git a/libpsx/src/cdromh.s b/libpsx/src/cdromh.s
new file mode 100644
index 0000000..b2968c1
--- /dev/null
+++ b/libpsx/src/cdromh.s
@@ -0,0 +1,109 @@
+.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