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Edges towards a functioning IIgs memory map.

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Next up: making sure language and auxiliary switches apply. That should get something from the ROM.
This commit is contained in:
Thomas Harte 2020-10-23 19:41:10 -04:00
parent 966241b4cc
commit ddd84db510
1 changed files with 54 additions and 4 deletions
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58
Machines/Apple/AppleIIgs/AppleIIgs.cpp
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@ -13,6 +13,9 @@
#include "../../../Analyser/Static/AppleIIgs/Target.hpp"
#include "../AppleII/LanguageCardSwitches.hpp"
#include "../AppleII/AuxiliaryMemorySwitches.hpp"
namespace Apple {
namespace IIgs {
@ -24,7 +27,9 @@ class ConcreteMachine:
public:
ConcreteMachine(const Analyser::Static::AppleIIgs::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
m65816_(*this) {
m65816_(*this),
auxiliary_switches_(*this),
language_card_(*this) {
set_clock_rate(14318180.0);
@ -55,16 +60,48 @@ class ConcreteMachine:
break;
case Target::MemoryModel::OneMB:
ram_size = 256 + 1024;
ram_size = 128 + 1024;
break;
case Target::MemoryModel::EightMB:
ram_size = 256 + 8 * 1024;
ram_size = 128 + 8 * 1024;
break;
}
ram_.resize(ram_size * 1024);
// TODO: establish initial bus mapping and storage.
// Establish bank storage.
// Fast RAM storage.
for(size_t c = 0; c < 0x80; ++c) {
if(c * 64 < (ram_size - 128)) {
bank_storage_[c].read = bank_storage_[c].write = &ram_[c * 0x10000];
}
}
// Mega II RAM storage.
bank_storage_[0xe0].read = bank_storage_[0xe0].write = &ram_[ram_.size() - 0x20000];
bank_storage_[0xe1].read = bank_storage_[0xe1].write = &ram_[ram_.size() - 0x10000];
// ROM storage.
const size_t rom_page_count = rom_.size() >> 16;
const size_t first_rom_page = 0x100 - rom_page_count;
for(size_t c = 0; c < rom_page_count; ++c) {
bank_storage_[first_rom_page + c].read = &rom_[c * 0x10000];
}
// Establish initial bank mapping.
for(size_t c = 0; c < 65536; ++c) {
bank_mapping_[c].destination = uint8_t(c >> 8);
}
for(size_t c = 0; c < 256; ++c) {
bank_mapping_[0xe000 + c].flags = BankMapping::Is1Mhz;
bank_mapping_[0xe100 + c].flags = BankMapping::Is1Mhz;
}
// Apply initial language/auxiliary state. [TODO: including shadowing register].
set_card_paging();
set_zero_page_paging();
set_main_paging();
}
void run_for(const Cycles cycles) override {
@ -115,8 +152,21 @@ class ConcreteMachine:
return duration;
}
// MARK: - Memory banking.
void set_language_card_paging() {
}
void set_card_paging() {
}
void set_zero_page_paging() {
set_language_card_paging();
}
void set_main_paging() {
}
private:
CPU::WDC65816::Processor<ConcreteMachine, false> m65816_;
Apple::II::AuxiliaryMemorySwitches<ConcreteMachine> auxiliary_switches_;
Apple::II::LanguageCardSwitches<ConcreteMachine> language_card_;
int fast_access_phase_ = 0;
int slow_access_phase_ = 0;