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Merge pull request #1093 from TomHarte/IIgsFill
Apple IIgs: better spell out shadowing logic.
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commit
7e3dbbbf0a
@ -200,6 +200,7 @@ class ConcreteMachine:
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public:
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ConcreteMachine(const Analyser::Static::AppleIIgs::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
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m65816_(*this),
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memory_(target.model >= Analyser::Static::AppleIIgs::Target::Model::ROM03),
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iwm_(CLOCK_RATE / 2),
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drives35_{
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{CLOCK_RATE / 2, true},
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@ -26,7 +26,9 @@ class MemoryMap {
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public:
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// MARK: - Initial construction and configuration.
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MemoryMap() : auxiliary_switches_(*this), language_card_(*this) {}
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MemoryMap(bool is_rom03) : auxiliary_switches_(*this), language_card_(*this) {
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setup_shadow_maps(is_rom03);
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}
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void set_storage(std::vector<uint8_t> &ram, std::vector<uint8_t> &rom) {
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// Keep a pointer for later; also note the proper RAM offset.
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@ -456,9 +458,6 @@ class MemoryMap {
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// $6000–$a000 Odd banks only, rest of Super High-res
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// [plus IO and language card space, subject to your definition of shadowing]
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static constexpr int shadow_shift = 10;
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static constexpr int auxiliary_offset = 0x1'0000 >> shadow_shift;
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enum Inhibit {
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TextPage1 = 0x01,
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HighRes1 = 0x02,
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@ -468,15 +467,25 @@ class MemoryMap {
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TextPage2 = 0x20,
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};
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// Clear all shadowing.
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shadow_pages.reset();
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// Text Page 1, main and auxiliary — $0400–$0800.
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for(size_t c = 0x0400 >> shadow_shift; c < 0x0800 >> shadow_shift; c++) {
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shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & Inhibit::TextPage1);
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{
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const bool should_shadow_text1 = !(shadow_register_ & Inhibit::TextPage1);
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if(should_shadow_text1) {
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shadow_pages |= shadow_text1;
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}
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}
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// Text Page 2, main and auxiliary — 0x0800–0x0c00.
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// TODO: on a ROM03 machine only.
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for(size_t c = 0x0800 >> shadow_shift; c < 0x0c00 >> shadow_shift; c++) {
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shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & Inhibit::TextPage2);
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//
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// The mask applied will be all 0 for a pre-ROM03 machine.
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{
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const bool should_shadow_text2 = !(shadow_register_ & Inhibit::TextPage2);
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if(should_shadow_text2) {
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shadow_pages |= shadow_text2;
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}
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}
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// Hi-res graphics Page 1, main and auxiliary — $2000–$4000;
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@ -486,35 +495,55 @@ class MemoryMap {
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// high-res graphics page 1 inhibit bit alone is definitive.
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//
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// Odd test:
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// (high-res graphics inhibit or auxiliary high res graphics inhibit) _and_ (super high-res inhibit).
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// (high-res graphics inhibit or auxiliary high res graphics inhibit) _and_
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// (super high-res inhibit).
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//
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for(size_t c = 0x2000 >> shadow_shift; c < 0x4000 >> shadow_shift; c++) {
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shadow_pages[c] = !(shadow_register_ & Inhibit::HighRes1);
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shadow_pages[c+auxiliary_offset] = !(
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{
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const bool should_shadow_highres1 = !(shadow_register_ & Inhibit::HighRes1);
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if(should_shadow_highres1) {
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shadow_pages |= shadow_highres1;
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}
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const bool should_shadow_aux_highres1 = !(
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shadow_register_ & (Inhibit::HighRes1 | Inhibit::AuxiliaryHighRes) &&
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shadow_register_ & Inhibit::SuperHighRes
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);
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if(should_shadow_aux_highres1) {
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shadow_pages |= shadow_highres1_aux;
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}
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}
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// Hi-res graphics Page 2, main and auxiliary — $4000–$6000;
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// also part of the super high-res graphics page.
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//
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// Test applied: much like that for page 1.
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for(size_t c = 0x4000 >> shadow_shift; c < 0x6000 >> shadow_shift; c++) {
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shadow_pages[c] = !(shadow_register_ & Inhibit::HighRes2);
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shadow_pages[c+auxiliary_offset] = !(
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{
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const bool should_shadow_highres2 = !(shadow_register_ & Inhibit::HighRes2);
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if(should_shadow_highres2) {
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shadow_pages |= shadow_highres2;
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}
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const bool should_shadow_aux_highres2 = !(
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shadow_register_ & (Inhibit::HighRes2 | Inhibit::AuxiliaryHighRes) &&
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shadow_register_ & Inhibit::SuperHighRes
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);
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if(should_shadow_aux_highres2) {
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shadow_pages |= shadow_highres2_aux;
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}
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}
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// Residue of Super Hi-Res — $6000–$a000 (odd pages only).
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//
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// Test applied:
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// auxiliary high res graphics inhibit and super high-res inhibit
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for(size_t c = 0x6000 >> shadow_shift; c < 0xa000 >> shadow_shift; c++) {
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shadow_pages[c+auxiliary_offset] =
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!(shadow_register_ & Inhibit::SuperHighRes && shadow_register_ & Inhibit::AuxiliaryHighRes);
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{
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const bool should_shadow_superhighres = !(
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shadow_register_ & Inhibit::SuperHighRes &&
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shadow_register_ & Inhibit::AuxiliaryHighRes
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);
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if(should_shadow_superhighres) {
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shadow_pages |= shadow_superhighres;
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}
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}
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}
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@ -537,6 +566,45 @@ class MemoryMap {
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#undef assert_is_region
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private:
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// Various precomputed bitsets describing key regions; std::bitset doesn't support constexpr instantiation
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// beyond the first 64 bits at the time of writing, alas, so these are generated at runtime.
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std::bitset<128> shadow_text1;
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std::bitset<128> shadow_text2;
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std::bitset<128> shadow_highres1, shadow_highres1_aux;
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std::bitset<128> shadow_highres2, shadow_highres2_aux;
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std::bitset<128> shadow_superhighres;
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void setup_shadow_maps(bool is_rom03) {
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static constexpr int shadow_shift = 10;
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static constexpr int auxiliary_offset = 0x1'0000 >> shadow_shift;
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for(size_t c = 0x0400 >> shadow_shift; c < 0x0800 >> shadow_shift; c++) {
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shadow_text1[c] = shadow_text1[c+auxiliary_offset] = true;
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}
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// Shadowing of text page 2 was added only with the ROM03 machine.
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if(is_rom03) {
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for(size_t c = 0x0800 >> shadow_shift; c < 0x0c00 >> shadow_shift; c++) {
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shadow_text2[c] = shadow_text2[c+auxiliary_offset] = true;
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}
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}
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for(size_t c = 0x2000 >> shadow_shift; c < 0x4000 >> shadow_shift; c++) {
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shadow_highres1[c] = true;
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shadow_highres1_aux[c+auxiliary_offset] = true;
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}
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for(size_t c = 0x4000 >> shadow_shift; c < 0x6000 >> shadow_shift; c++) {
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shadow_highres2[c] = true;
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shadow_highres2_aux[c+auxiliary_offset] = true;
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}
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for(size_t c = 0x6000 >> shadow_shift; c < 0xa000 >> shadow_shift; c++) {
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shadow_superhighres[c+auxiliary_offset] = true;
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}
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}
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public:
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// Memory layout here is done via double indirection; the main loop should:
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// (i) use the top two bytes of the address to get an index from memory_map_; and
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@ -11,7 +11,10 @@
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#include "../../../Machines/Apple/AppleIIgs/MemoryMap.hpp"
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namespace {
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using MemoryMap = Apple::IIgs::MemoryMap;
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// Test the ROM03-era mapping hardware.
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struct MemoryMap: public Apple::IIgs::MemoryMap {
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MemoryMap() : Apple::IIgs::MemoryMap(true) {}
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};
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}
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@interface IIgsMemoryMapTests : XCTestCase
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