Added long awaited CD-ROM library and loads of fixes, see changelog for details

1 files changed, 53 insertions, 0 deletions

diff --git a/libpsn00b/libpsxcd/cdgetsector.s b/libpsn00b/libpsxcd/cdgetsector.s
new file mode 100644
index 0000000..70039bf
--- /dev/null
+++ b/libpsn00b/libpsxcd/cdgetsector.s
@@ -0,0 +1,53 @@
+.set noreorder
+
+.include "hwregs_a.h"
+
+.section .text
+
+.global CdGetSector
+.type CdGetSector, @function
+CdGetSector:
+	
+	lui		$a2, IOBASE
+	
+.Lwait_fifo:
+	lbu		$v0, CD_REG0($a2)
+	nop
+	andi	$v0, 0x40
+	beqz	$v0, .Lwait_fifo
+	nop
+
+	lui		$v0, 0x1
+	srl		$a1, 2
+	or		$v0, $a1
+	sw		$a0, D3_MADR($a2)	# Set DMA base address and transfer length
+	sw		$v0, D3_BCR($a2)
+
+	lui		$v0, 0x1100			# Start DMA transfer
+	sw		$v0, D3_CHCR($a2)
+	nop
+	nop
+.Ldma_wait:
+	lw		$v0, D3_CHCR($a2)
+	nop
+	srl		$v0, 24
+	andi	$v0, 0x1
+	bnez	$v0, .Ldma_wait
+	nop
+	
+# Not stable
+#	sb		$0 , CD_REG0($a2)
+#.Lflush_fifo:					# Read out any remaining bytes in the buffer
+#	lbu		$v1, CD_REG0($a2)
+#	li		$v0, 0x40
+#	and		$v1, $v0
+#	beqz	$v1, .Lend_flush
+#	nop
+#	lbu		$v0, CD_REG2($a2)
+#	b		.Lflush_fifo
+#	nop
+#.Lend_flush:
+	
+	jr		$ra
+	li		$v0, 1
+