LibPSn00b officially v0.10b, added psxsio library, better DrawSync() and VSync(), better reference manual.

1 files changed, 191 insertions, 0 deletions

diff --git a/libpsn00b/psxgpu/dmacallback.s b/libpsn00b/psxgpu/dmacallback.s
new file mode 100644
index 0000000..b2f86cf
--- /dev/null
+++ b/libpsn00b/psxgpu/dmacallback.s
@@ -0,0 +1,191 @@
+.set noreorder
+
+.include "hwregs_a.h"
+
+.section .text
+
+.global DMACallback
+.type DMACallback, @function
+DMACallback:
+
+	# a0 - DMA channel
+	# a1 - Callback function
+	
+	addiu	$sp, -8
+	sw		$ra, 0($sp)
+
+	beqz	$a1, .Lremove_cb		# Remove callback if function is NULL
+	nop
+	
+	addiu	$sp, -8					# Install IRQ handler for DMA handler
+	sw		$a0, 0($sp)				# if not set installed yet
+	sw		$a1, 4($sp)
+	
+	jal		GetInterruptCallback
+	li		$a0, 3
+	
+	bnez	$v0, .Lskip_install
+	nop
+	
+	la		$a1, _dma_handler
+	jal		InterruptCallback
+	li		$a0, 3
+
+.Lskip_install:
+	
+	lw		$a0, 0($sp)
+	lw		$a1, 4($sp)
+	addiu	$sp, 8
+	
+	la		$v0, _dma_func_table
+	sll		$v1, $a0, 2
+	addu	$v0, $v1
+	lw		$v1, 0($v0)
+	sw		$a1, 0($v0)
+	sw		$v1, 4($sp)
+	
+	lui		$a2, IOBASE
+	
+	lw		$v0, DICR($a2)			# Enable DMA interrupt
+	lui		$v1, 0x1
+	sll		$v1, $a0
+	or		$v0, $v1
+	lui		$v1, 0x80
+	or		$v0, $v1
+	sw		$v0, DICR($a2)
+	
+	b		.Lskip_remove
+	nop
+	
+.Lremove_cb:
+
+	la		$v0, _dma_func_table	# Set callback address
+	sll		$v1, $a0, 2
+	addu	$v0, $v1
+	lw		$v1, 0($v0)
+	sw		$a1, 0($v0)
+	sw		$v1, 4($sp)
+	
+	lui		$a2, IOBASE				# Disable DMA interrupt
+	lw		$v0, DICR($a2)
+	lui		$v1, 0x1
+	sll		$v1, $a0
+	.set noat
+	addiu	$at, $0, -1
+	xor		$v1, $at
+	and		$v0, $v1
+	lui		$v1, 0x7f00
+	xor		$v1, $at
+	and		$v0, $v1
+	.set at
+	sw		$v0, DICR($a2)
+	
+	jal		_dma_has_cb				# Check if callbacks are present
+	nop
+	bnez	$v0, .Lskip_remove
+	nop
+	sw		$0 , DICR($a2)
+	
+	jal		GetInterruptCallback	# Check if callback is the DMA handler
+	li		$a0, 3
+	la		$v1, _dma_handler
+	bne		$v0, $v1, .Lskip_remove
+	nop
+	
+	li		$a0, 3
+	jal		InterruptCallback
+	move	$a1, $0
+	
+.Lskip_remove:
+	
+	lw		$ra, 0($sp)
+	lw		$v0, 4($sp)
+	jr		$ra
+	addiu	$sp, 8
+
+	
+.type _dma_has_cb, @function
+_dma_has_cb:
+
+	la		$v1, _dma_func_table
+	li		$t0, 6
+	
+.Lscan_loop:
+
+	lw		$v0, 0($v1)
+	addiu	$v1, 4
+	bnez	$v0, .Lhas_cb
+	nop
+	
+	bgtz	$t0, .Lscan_loop
+	addiu	$t0, -1
+	
+	jr		$ra
+	move	$v0, $0
+	
+.Lhas_cb:
+
+	jr		$ra
+	li		$v0, 1
+	
+	
+.type _dma_handler, @function
+_dma_handler:
+
+	addiu	$sp, -12
+	sw		$ra, 0($sp)
+	sw		$s0, 4($sp)
+	sw		$s1, 8($sp)
+	
+	move	$s0, $0
+	la		$s1, _dma_func_table
+	
+.Lhandler_loop:
+
+	lui		$a0, IOBASE
+	lw		$v0, DICR($a0)
+	li		$v1, 24
+	addu	$v1, $s0
+	srl		$v0, $v1
+	andi	$v0, 0x1
+	
+	lw		$v1, 0($s1)
+	
+	beqz	$v0, .Lno_irq
+	addiu	$s1, 4
+	
+	beqz	$v1, .Lno_irq
+	nop
+	
+	jalr	$v1
+	nop
+	
+.Lno_irq:
+	
+	blt		$s0, 6, .Lhandler_loop
+	addi	$s0, 1
+	
+	lui		$a0, IOBASE
+	lw		$v0, DICR($a0)
+	nop
+	sw		$v0, DICR($a0)
+	
+	lw		$ra, 0($sp)
+	lw		$s0, 4($sp)
+	lw		$s1, 8($sp)
+	
+	jr		$ra
+	addiu	$sp, -12
+	
+	
+.section .data
+
+_dma_func_table:
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	
\ No newline at end of file