Apple-2-Tools/bradgrantham-apple2e
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Speed up memory accesses by binning by page

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This commit is contained in:
Brad Grantham 2016-11-17 21:50:09 -08:00
parent bc02e9ee6a
commit a9f3df0320
1 changed files with 22 additions and 5 deletions
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27
apple2e.cpp
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@ -178,9 +178,9 @@ struct APPLE2Edisplay
// bool mixed_mode = false;
if(mode == TEXT) {
display_text(display_page);
} else if(mode == HIRES) {
} // else if(mode == HIRES) {
display_hires(display_page, update);
}
// }
}
static const int text_page1_base = 0x400;
@ -322,6 +322,8 @@ struct MAINboard : board_base
SoftSwitch HIRES {"HIRES", 0xC056, 0xC057, 0xC01D, true, switches, true};
vector<backed_region*> regions;
vector<backed_region*> regions_by_page[256];
backed_region szp = {"szp", 0x0000, 0x0200, RAM, regions, [&](){return !ALTZP;}}; // stack and zero page
backed_region aszp = {"aszp", 0x0000, 0x0200, RAM, regions, [&](){return ALTZP;}}; // alternate stack and zero page
@ -411,6 +413,18 @@ struct MAINboard : board_base
std::copy(rom_image + rom_C300.base - 0x8000, rom_image + rom_C300.base - 0x8000 + rom_C300.size, rom_C300.memory.begin());
std::copy(rom_image + rom_C400.base - 0x8000, rom_image + rom_C400.base - 0x8000 + rom_C400.size, rom_C400.memory.begin());
std::copy(rom_image + rom_C800.base - 0x8000, rom_image + rom_C800.base - 0x8000 + rom_C800.size, rom_C800.memory.begin());
for(auto it = regions.begin(); it != regions.end(); it++) {
backed_region* r = *it;
int firstpage = r->base / 256;
int lastpage = (r->base + r->size + 255) / 256 - 1;
printf("%04X %04X ->", r->base, r->base + r->size - 1);
for(int i = firstpage; i <= lastpage; i++) {
printf(" %02X", i);
regions_by_page[i].push_back(r);
}
printf("\n");
}
}
virtual ~MAINboard()
@ -509,7 +523,7 @@ struct MAINboard : board_base
printf("unhandled MMIO Read at %04X\n", addr);
fflush(stdout); exit(0);
}
for(auto it = regions.begin(); it != regions.end(); it++) {
for(auto it = regions_by_page[addr / 256].begin(); it != regions_by_page[addr / 256].end(); it++) {
backed_region* r = *it;
if(r->read(addr, data)) {
if(debug & DEBUG_RW) printf("read 0x%04X -> 0x%02X from %s\n", addr, data, r->name.c_str());
@ -538,6 +552,7 @@ struct MAINboard : board_base
}
virtual bool write(int addr, unsigned char data)
{
#if 0
if(text_page1.write(addr, data) ||
text_page1x.write(addr, data) ||
text_page2.write(addr, data) ||
@ -546,9 +561,11 @@ struct MAINboard : board_base
hires_page1x.write(addr, data) ||
hires_page2.write(addr, data) ||
hires_page2x.write(addr, data))
#else
if(((addr >= 0x400) && (addr <= 0xBFF)) || ((addr >= 0x2000) && (addr <= 0x5FFF)))
#endif
{
display->write(addr, data);
return true;
}
if(io_region.contains(addr)) {
if(exit_on_banking && (banking_write_switches.find(addr) != banking_write_switches.end())) {
@ -587,7 +604,7 @@ struct MAINboard : board_base
printf("unhandled MMIO Write at %04X\n", addr);
fflush(stdout); exit(0);
}
for(auto it = regions.begin(); it != regions.end(); it++) {
for(auto it = regions_by_page[addr / 256].begin(); it != regions_by_page[addr / 256].end(); it++) {
backed_region* r = *it;
if(r->write(addr, data)) {
if(debug & DEBUG_RW) printf("wrote %02X to 0x%04X in %s\n", addr, data, r->name.c_str());