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| author | Lameguy64 <lameguy64@gmail.com> | 2021-10-25 10:51:50 +0800 |
|---|---|---|
| committer | Lameguy64 <lameguy64@gmail.com> | 2021-10-25 10:51:50 +0800 |
| commit | 538f28cfbbbb8163ab8a96de77d6887123856c81 (patch) | |
| tree | a3108f05c038d0f43f2e96ae4d2d34ce4da225b4 /indev/psxmdec/mdec.s | |
| parent | 7718b576b7aba725455ce510ee9632067a65f0d7 (diff) | |
| download | psn00bsdk-538f28cfbbbb8163ab8a96de77d6887123856c81.tar.gz | |
Added indev directory
Diffstat (limited to 'indev/psxmdec/mdec.s')
| -rw-r--r-- | indev/psxmdec/mdec.s | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/indev/psxmdec/mdec.s b/indev/psxmdec/mdec.s new file mode 100644 index 0000000..a7b5094 --- /dev/null +++ b/indev/psxmdec/mdec.s @@ -0,0 +1,185 @@ +.set noreorder
+
+.include "hwregs_a.h"
+
+.section .text
+
+.global mdec_reset # Resets the MDEC
+.type mdec_reset, @function
+mdec_reset:
+
+ lui $a0, IOBASE
+
+ lui $v0, 0xE000 # Reset MDEC
+ sw $v0, MDEC1($a0)
+ nop
+
+ lui $v1, 0x8004 # Wait until reset completes
+.Lreset_wait:
+ lw $v0, MDEC1($a0)
+ nop
+ bne $v0, $v1, .Lreset_wait
+ nop
+
+ jr $ra
+ nop
+
+
+.global mdec_cmd # Sends a MDEC command word
+.type mdec_cmd, @function
+mdec_cmd:
+
+ lui $a1, IOBASE
+
+.Lcmd_ready: # Wait until command busy is zero
+ lw $v0, MDEC1($a1)
+ lui $v1, 0x2000
+ and $v0, $v1
+ bnez $v0, .Lcmd_ready
+ nop
+
+ sw $a0, MDEC0($a1) # Write command word
+
+ jr $ra
+ nop
+
+.global mdec_in # Transmit data to DMA0 (MDEC in)
+.type mdec_in, @function
+mdec_in:
+
+ # a0 - data source address
+ # a1 - blocks to transfer (64 bytes per block)
+
+ lui $a3, IOBASE
+
+.Lmdec_in_wait: # Wait until MDEC is ready for data
+ lw $v0, MDEC1($a3)
+ lui $v1, 0x1000
+ and $v0, $v1
+ beqz $v0, .Lmdec_in_wait
+ nop
+
+ sw $a0, D0_MADR($a3) # Set source address
+
+ andi $v0, $a1, 0xFFFF # Set transfer length
+ sll $v0, 16
+ ori $v0, 0x20 # 32 word block size
+ sw $v0, D0_BCR($a3)
+
+ lui $v0, 0x0100 # Begin transfer
+ ori $v0, 0x0201
+ sw $v0, D0_CHCR($a3)
+
+ jr $ra
+ nop
+
+.global mdec_out # Transmit data to DMA0 (MDEC in)
+.type mdec_out, @function
+mdec_out:
+
+ # a0 - data source address
+ # a1 - blocks to transfer (64 bytes per block)
+
+ lui $a3, IOBASE
+
+.Lmdec_out_ready: # Wait until MDEC is ready for data
+ lw $v0, MDEC1($a3)
+ lui $v1, 0x1000
+ and $v0, $v1
+ beqz $v0, .Lmdec_out_ready
+ nop
+
+ sw $a0, D1_MADR($a3) # Set source address
+
+ andi $v0, $a1, 0xFFFF # Set transfer length
+ sll $v0, 16
+ ori $v0, 0x20 # 32 word block size
+ sw $v0, D1_BCR($a3)
+
+ lui $v0, 0x0100 # Begin transfer
+ ori $v0, 0x0200
+ sw $v0, D1_CHCR($a3)
+
+.Lmdec_out_wait:
+ lw $v0, D1_CHCR($a3)
+ lui $v1, 0x0200
+ and $v0, $v1
+ bnez $v0, .Lmdec_out_wait
+ nop
+
+ jr $ra
+ nop
+
+.global mdec_setscale # Uploads the internal scaletable to MDEC
+.type mdec_setscale, @function
+mdec_setscale:
+
+ addiu $sp, -4
+ sw $ra, 0($sp)
+
+ lui $a0, 0x6000 # Set scaletable command
+ jal mdec_cmd
+ nop
+
+ la $a0, _mdec_scaletable # Upload scaletable
+ jal mdec_in
+ li $a1, 1 # 64 halfwords
+
+ lw $ra, 0($sp)
+ addiu $sp, 4
+ jr $ra
+ nop
+
+
+.global mdec_setquants # Uploads the internal quant tables
+.type mdec_setquants, @function
+mdec_setquants:
+
+ addiu $sp, -4
+ sw $ra, 0($sp)
+
+ lui $a0, 0x4000 # Set quant tables command
+ ori $a0, 0x0001 # luma + chroma data
+ jal mdec_cmd
+ nop
+
+ la $a0, _mdec_qtables # Upload quant tables
+ jal mdec_in
+ li $a1, 2 # 128 halfwords
+
+ lw $ra, 0($sp)
+ addiu $sp, 4
+ jr $ra
+ nop
+
+
+.section .data
+
+_mdec_qtables:
+ # taken from CCITT Rec. T.81
+ .hword 16, 11, 10, 16, 24, 40, 51, 61 # Luma table
+ .hword 12, 12, 14, 19, 26, 58, 60, 55
+ .hword 14, 13, 16, 24, 40, 57, 69, 56
+ .hword 14, 17, 22, 29, 51, 87, 80, 62
+ .hword 18, 22, 37, 56, 68, 109, 103, 77
+ .hword 24, 35, 55, 64, 81, 104, 113, 92
+ .hword 49, 64, 78, 87, 103, 121, 120, 101
+ .hword 72, 92, 95, 98, 112, 100, 103, 99
+ .hword 17, 18, 24, 47, 99, 99, 99, 99 # Chroma table
+ .hword 18, 21, 26, 66, 99, 99, 99, 99
+ .hword 24, 26, 56, 99, 99, 99, 99, 99
+ .hword 47, 66, 99, 99, 99, 99, 99, 99
+ .hword 99, 99, 99, 99, 99, 99, 99, 99
+ .hword 99, 99, 99, 99, 99, 99, 99, 99
+ .hword 99, 99, 99, 99, 99, 99, 99, 99
+ .hword 99, 99, 99, 99, 99, 99, 99, 99
+
+_mdec_scaletable:
+ .hword 0x5A82,0x5A82,0x5A82,0x5A82,0x5A82,0x5A82,0x5A82,0x5A82
+ .hword 0x7D8A,0x6A6D,0x471C,0x18F8,0xE707,0xB8E3,0x9592,0x8275
+ .hword 0x7641,0x30FB,0xCF04,0x89BE,0x89BE,0xCF04,0x30FB,0x7641
+ .hword 0x6A6D,0xE707,0x8275,0xB8E3,0x471C,0x7D8A,0x18F8,0x9592
+ .hword 0x5A82,0xA57D,0xA57D,0x5A82,0x5A82,0xA57D,0xA57D,0x5A82
+ .hword 0x471C,0x8275,0x18F8,0x6A6D,0x9592,0xE707,0x7D8A,0xB8E3
+ .hword 0x30FB,0x89BE,0x7641,0xCF04,0xCF04,0x7641,0x89BE,0x30FB
+ .hword 0x18F8,0xB8E3,0x6A6D,0x8275,0x7D8A,0x9592,0x471C,0xE707
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