RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 15:27:46 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

memhandlers slightly improved

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@234 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-09-01 21:34:13 +00:00
parent a5ccbfbaf0
commit e5503e2f4f
7 changed files with 369 additions and 159 deletions
Download patch file Download diff file Expand all files Collapse all files

29
cpu/DrZ80/drz80.s
View file

@ -111,40 +111,37 @@ DrZ80Ver: .long 0x0001
.if DRZ80_FOR_PICODRIVE
.macro YM2612Read_and_ret8
stmfd sp!,{r3,r12,lr}
stmfd sp!,{r3,r12,lr}
.if EXTERNAL_YM2612
ldr r1,=PicoOpt
ldr r1,[r1]
tst r1,#0x200
bne 10f
bl YM2612Read_
ldmfd sp!,{r3,r12,pc}
10:
bl YM2612Read_940
ldrne r2, =YM2612Read_940
ldreq r2, =YM2612Read_
mov lr,pc
bx r2
.else
bl YM2612Read_
.endif
ldmfd sp!,{r3,r12,pc}
ldmfd sp!,{r3,r12,pc}
.endm
.macro YM2612Read_and_ret16
stmfd sp!,{r3,r12,lr}
stmfd sp!,{r3,r12,lr}
.if EXTERNAL_YM2612
ldr r0,=PicoOpt
ldr r0,[r0]
tst r0,#0x200
bne 10f
bl YM2612Read_
orr r0,r0,r0,lsl #8
ldmfd sp!,{r3,r12,pc}
10:
bl YM2612Read_940
ldrne r2, =YM2612Read_940
ldreq r2, =YM2612Read_
mov lr,pc
bx r2
orr r0,r0,r0,lsl #8
.else
bl YM2612Read_
orr r0,r0,r0,lsl #8
.endif
ldmfd sp!,{r3,r12,pc}
ldmfd sp!,{r3,r12,pc}
.endm
pico_z80_read8: @ addr
@ -173,7 +170,7 @@ pico_z80_read8: @ addr
cmp r1,#2 @ YM2612 (0x4000-0x5fff)
bne 0f
and r0,r0,#3
YM2612Read_and_ret8
YM2612Read_and_ret8
0:
cmp r0,#0x4000
movge r0,#0xff