mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-04 14:57:45 -04:00
cff531af94
- PicoDrive was originally released by fDave with simple
"free for non-commercial use / For commercial use, separate licencing
terms must be obtained" license and I kept it in my releases.
- in 2011, fDave re-released his code (same that I used as base
many years ago) dual licensed with GPLv2 and MAME licenses:
https://code.google.com/p/cyclone68000/
Based on the above I now proclaim that the whole source code is licensed
under the MAME license as more elaborate form of "for non-commercial use".
If that raises any doubt, I announce that all my modifications (which
is the vast majority of code by now) is licensed under the MAME license,
as it reads in COPYING file in this commit.
This does not affect ym2612.c/sn76496.c that were MAME licensed already
from the beginning.
79 lines
1.7 KiB
ArmAsm
79 lines
1.7 KiB
ArmAsm
@*
|
|
@* Memory converters for different modes
|
|
@* (C) notaz, 2007-2008
|
|
@*
|
|
@* This work is licensed under the terms of MAME license.
|
|
@* See COPYING file in the top-level directory.
|
|
@*
|
|
|
|
|
|
@ 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}
|
|
|
|
@ vim:filetype=armasm
|