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

runs code in 1M wram, cell arrange, decode (untested)

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@54 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-21 22:23:37 +00:00
parent 3a81ecde1c
commit fa1e5e2948
16 changed files with 787 additions and 551 deletions
Download patch file Download diff file Expand all files Collapse all files

27
Pico/VideoPort.c
View file

@ -8,6 +8,7 @@
#include "PicoInt.h"
#include "cd/gfx_cd.h"
extern const unsigned char hcounts_32[];
extern const unsigned char hcounts_40[];
@ -98,25 +99,31 @@ static void DmaSlow(int len)
pd=(u16 *)(Pico.ram+(source&0xfffe));
pdend=(u16 *)(Pico.ram+0x10000);
} else if(PicoMCD & 1) {
dprintf("DmaSlow CD");
dprintf("DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);
if(source<0x20000) { // Bios area
pd=(u16 *)(Pico_mcd->bios+(source&~1));
pdend=(u16 *)(Pico_mcd->bios+0x20000);
} else if ((source&0xfc0000)==0x200000 && (!(Pico_mcd->s68k_regs[3]&4))) { // Word Ram
} else if ((source&0xfc0000)==0x200000) { // Word Ram
source -= 2;
if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode
source -= 2;
pd=(u16 *)(Pico_mcd->word_ram+(source&0x3fffe));
pdend=(u16 *)(Pico_mcd->word_ram+0x40000);
pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));
pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);
} else {
dprintf("DmaSlow: unsupported src");
return;
if (source < 0x220000) { // 1M mode
int bank = Pico_mcd->s68k_regs[3]&1;
pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));
pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);
} else {
DmaSlowCell(source, a, len, inc);
return;
}
}
} else if ((source&0xfe0000)==0x020000) { // Prg Ram
u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
pd=(u16 *)(prg_ram+(source&0x1fffe));
pdend=(u16 *)(prg_ram+0x20000);
} else {
dprintf("DmaSlow: unsupported src");
dprintf("DmaSlow FIXME: unsupported src");
return;
}
} else {
@ -142,8 +149,8 @@ static void DmaSlow(int len)
if (inc == 2 && !(a&1) && a+len*2 < 0x10000)
{
// most used DMA mode
memcpy16(r + (a>>1), pd, len);
a += len*2;
memcpy16(r + (a>>1), pd, len);
a += len*2;
}
else
{