diff options
Diffstat (limited to 'libpsn00b/libpsxcd/cdgetsector.s')
| -rw-r--r-- | libpsn00b/libpsxcd/cdgetsector.s | 53 |
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 + |