RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-06 07:38:05 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

1.32 release

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@87 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-04-04 18:35:48 +00:00
parent 4696954094
commit 6cadc2da00
42 changed files with 803 additions and 167 deletions
Download patch file Download diff file Expand all files Collapse all files

76
Pico/cd/misc.s Normal file
View file

@ -0,0 +1,76 @@
@ vim:filetype=armasm
@ Memory converters for different modes
@ (c) Copyright 2007, Grazvydas "notaz" Ignotas
@ r10 is tmp, io1 is lsb halfword, io2 is msb
@ | 0 1 | 2 3 | -> | 0 2 | 1 3 | (little endian)
.macro _conv_reg io1 io2
mov r10, \io2, lsl #16
and \io2, \io2, r11, lsl #16
orr \io2, \io2, \io1, lsr #16
and \io1, \io1, r11
orr \io1, \io1, r10
/*
mov \io2, \io2, ror #16
mov r10, \io1, lsl #16
orr r10, r10, \io2, lsr #16
mov \io1, \io1, lsr #16
orr \io1, \io1, \io2, lsl #16
mov \io2, r10, ror #16
*/
.endm
.global wram_2M_to_1M
wram_2M_to_1M:
stmfd sp!,{r4-r11,lr}
add r1, r0, #0x60000 @ m1M_b1
add r0, r0, #0x40000 @ m1M_b0
mov r2, r0 @ m2M
mov r11, #0xff
orr r11, r11, r11, lsl #8
mov r12, #(0x40000/8/4)
_2Mto1M_loop:
ldmdb r2!,{r3-r9,lr}
_conv_reg r3,r4
_conv_reg r5,r6
_conv_reg r7,r8
_conv_reg r9,lr
subs r12, r12, #1
stmdb r0!,{r3,r5,r7,r9}
stmdb r1!,{r4,r6,r8,lr}
bne _2Mto1M_loop
ldmfd sp!,{r4-r11,pc}
.global wram_1M_to_2M
wram_1M_to_2M:
stmfd sp!,{r4-r11,lr}
mov r2, r0 @ m2M
add r1, r0, #0x40000 @ m1M_b1
add r0, r0, #0x20000 @ m1M_b0
mov r11, #0xff
orr r11, r11, r11, lsl #8
mov r12, #(0x40000/8/4)
_1Mto2M_loop:
ldmia r0!,{r3,r5,r7,r9}
ldmia r1!,{r4,r6,r8,lr}
_conv_reg r3,r4
_conv_reg r5,r6
_conv_reg r7,r8
_conv_reg r9,lr
subs r12, r12, #1
stmia r2!,{r3-r9,lr}
bne _1Mto2M_loop
ldmfd sp!,{r4-r11,pc}