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Merge pull request #131 from simon-frankau/classic_video

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Map framebuffer into accessible memory in 24-bit mode
This commit is contained in:
asvitkine 2017-10-06 08:44:16 -04:00 committed by GitHub
commit 40716c7c91
1 changed files with 73 additions and 16 deletions
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61
BasiliskII/src/uae_cpu/memory.cpp
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@ -463,6 +463,54 @@ uae_u8 *REGPARAM2 frame_xlate(uaecptr addr)
return (uae_u8 *)(FrameBaseDiff + addr);
}
/* Mac framebuffer RAM (24 bit addressing)
*
* This works by duplicating appropriate writes to the 32-bit
* address-space framebuffer.
*/
static void REGPARAM2 fram24_lput(uaecptr, uae_u32) REGPARAM;
static void REGPARAM2 fram24_wput(uaecptr, uae_u32) REGPARAM;
static void REGPARAM2 fram24_bput(uaecptr, uae_u32) REGPARAM;
void REGPARAM2 fram24_lput(uaecptr addr, uae_u32 l)
{
uaecptr page_off = addr & 0xffff;
if (0xa700 <= page_off && page_off < 0xfc80) {
uae_u32 *fm;
fm = (uae_u32 *)(MacFrameBaseHost + page_off - 0xa700);
do_put_mem_long(fm, l);
}
uae_u32 *m;
m = (uae_u32 *)(RAMBaseDiff + (addr & 0xffffff));
do_put_mem_long(m, l);
}
void REGPARAM2 fram24_wput(uaecptr addr, uae_u32 w)
{
uaecptr page_off = addr & 0xffff;
if (0xa700 <= page_off && page_off < 0xfc80) {
uae_u16 *fm;
fm = (uae_u16 *)(MacFrameBaseHost + page_off - 0xa700);
do_put_mem_word(fm, w);
}
uae_u16 *m;
m = (uae_u16 *)(RAMBaseDiff + (addr & 0xffffff));
do_put_mem_word(m, w);
}
void REGPARAM2 fram24_bput(uaecptr addr, uae_u32 b)
{
uaecptr page_off = addr & 0xffff;
if (0xa700 <= page_off && page_off < 0xfc80) {
*(uae_u8 *)(MacFrameBaseHost + page_off - 0xa700) = b;
}
*(uae_u8 *)(RAMBaseDiff + (addr & 0xffffff)) = b;
}
/* Default memory access functions */
uae_u8 *REGPARAM2 default_xlate (uaecptr a)
@ -527,6 +575,12 @@ addrbank frame_host_888_bank = {
frame_xlate
};
addrbank fram24_bank = {
ram24_lget, ram24_wget, ram24_bget,
fram24_lput, fram24_wput, fram24_bput,
ram24_xlate
};
void memory_init(void)
{
for(long i=0; i<65536; i++)
@ -539,14 +593,16 @@ void memory_init(void)
ROMBaseDiff = (uintptr)ROMBaseHost - (uintptr)ROMBaseMac;
FrameBaseDiff = (uintptr)MacFrameBaseHost - (uintptr)MacFrameBaseMac;
// Map RAM and ROM
// Map RAM, ROM and display
if (TwentyFourBitAddressing) {
map_banks(&ram24_bank, RAMBaseMac >> 16, ram_size >> 16);
map_banks(&rom24_bank, ROMBaseMac >> 16, ROMSize >> 16);
// Map frame buffer at end of RAM.
map_banks(&fram24_bank, ((RAMBaseMac + ram_size) >> 16) - 1, 1);
} else {
map_banks(&ram_bank, RAMBaseMac >> 16, ram_size >> 16);
map_banks(&rom_bank, ROMBaseMac >> 16, ROMSize >> 16);
}
// Map frame buffer
switch (MacFrameLayout) {
@ -564,6 +620,7 @@ void memory_init(void)
break;
}
}
}
void map_banks(addrbank *bank, int start, int size)
{