Merge pull request #46 from spicyjpeg/psxmdec

Critical ldscript fixes, initial MDEC support and CI updates

1 files changed, 37 insertions, 0 deletions

diff --git a/libpsn00b/psxapi/_initcd.s b/libpsn00b/psxapi/_initcd.s
new file mode 100644
index 0000000..c3a2861
--- /dev/null
+++ b/libpsn00b/psxapi/_initcd.s
@@ -0,0 +1,37 @@
+.section .text
+.set noreorder
+
+.include "hwregs_a.h"
+
+.global _InitCd
+.type _InitCd, @function
+_InitCd:
+	addiu	$sp, -8
+	sw		$ra, 0($sp)
+	
+	lui		$a0, IOBASE			# Load IOBASE value
+	
+	lw		$v0, DMA_DPCR($a0)	# Get current DMA settings
+	nop
+	sw		$v0, 4($sp)			# Save to stack
+	
+	jal		_96_init			# Init CD subsystem
+	nop
+	
+	lui		$a0, IOBASE			# Load IOBASE again
+	
+	lw		$v0, 4($sp)			# Get old DMA control settings
+	lw		$v1, DMA_DPCR($a0)	# Get DMA settings by _96_init()
+	
+	lui		$a1, 0xffff			# Mask out settings for CD DMA
+	ori		$a1, 0x0f00
+	and		$v0, $a1
+	
+	or		$v0, $v1			# Merge and set new DMA settings
+	sw		$v0, DMA_DPCR($a0)
+	
+	lw		$ra, 0($sp)
+	addiu	$sp, 8
+	jr		$ra
+	nop
+	
\ No newline at end of file