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Introduces a further 128 bits of storage to eliminate the conditional in IsShadowed.
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@ -187,6 +187,9 @@ class MemoryMap {
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set_storage((first_rom_bank + c) << 16, &rom[c << 16], nullptr);
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}
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// Set shadowing as working from banks 0 and 1 (forever).
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shadow_banks[0] = true;
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// TODO: set 1Mhz flags.
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// Apply initial language/auxiliary state.
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@ -215,7 +218,11 @@ class MemoryMap {
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void set_speed_register(uint8_t value) {
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speed_register_ = value;
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enable_all_pages_shadowing = speed_register_ & 0x10;
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// Enable or disable shadowing from banks 0x02–0x80.
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for(size_t c = 0x01; c < 0x40; c++) {
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shadow_banks[c] = speed_register_ & 0x10;
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}
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}
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void set_state_register(uint8_t value) {
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@ -426,13 +433,13 @@ class MemoryMap {
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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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is_shadowed[c] = is_shadowed[c+auxiliary_offset] = !(shadow_register_ & 0x01);
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shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x01);
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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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is_shadowed[c] = is_shadowed[c+auxiliary_offset] = !(shadow_register_ & 0x20);
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shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x20);
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}
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// Hi-res graphics Page 1, main and auxiliary — $2000–$4000;
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@ -445,8 +452,8 @@ class MemoryMap {
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// (high-res graphics inhibit or auxiliary high res graphics inhibit) _and_ (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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is_shadowed[c] = !(shadow_register_ & 0x02);
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is_shadowed[c+auxiliary_offset] = !(shadow_register_ & 0x12);
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shadow_pages[c] = !(shadow_register_ & 0x02);
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shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x12);
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}
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// Hi-res graphics Page 2, main and auxiliary — $4000–$6000;
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@ -454,13 +461,13 @@ class MemoryMap {
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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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is_shadowed[c] = !(shadow_register_ & 0x04);
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is_shadowed[c+auxiliary_offset] = !(shadow_register_ & 0x14);
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shadow_pages[c] = !(shadow_register_ & 0x04);
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shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x14);
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}
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// Residue of Super Hi-Res — $6000–$a000 (odd pages only).
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for(size_t c = 0x6000 >> shadow_shift; c < 0xa000 >> shadow_shift; c++) {
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is_shadowed[c+auxiliary_offset] = !(shadow_register_ & 0x08);
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shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x08);
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}
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}
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@ -559,10 +566,12 @@ class MemoryMap {
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// doctrinal reason for it to be whatever size it is now, just
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// adjust as required.
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// Contains a flag for every page in the final 128kb of memory, indicating whether it is
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// currently subject to shadowing.
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std::bitset<128> is_shadowed;
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bool enable_all_pages_shadowing = false;
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// Shadow_pages: divides the final 128kb of memory into 1kb chunks and includes a flag to indicate whether
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// each is a potential destination for shadowing.
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//
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// Shadow_banks: divides the whole 16mb of memory into 128kb chunks and includes a flag to indicate whether
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// each is a potential source of shadowing.
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std::bitset<128> shadow_pages, shadow_banks;
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};
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// TODO: branching below on region.read/write is predicated on the idea that extra scratch space
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@ -571,7 +580,7 @@ class MemoryMap {
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// TODO: somehow eliminate bank 0/1 conditional in IsShadowed.
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#define MemoryMapRegion(map, address) map.regions[map.region_map[address >> 8]]
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#define IsShadowed(map, region, address) map.is_shadowed[((®ion.write[address] - map.ram_base) >> 10) & 127] && (map.enable_all_pages_shadowing || (address < 0x2'0000))
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#define IsShadowed(map, region, address) (map.shadow_pages[((®ion.write[address] - map.ram_base) >> 10) & 127] & map.shadow_banks[address >> 17])
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#define MemoryMapRead(region, address, value) *value = region.read ? region.read[address] : 0xff
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#define MemoryMapWrite(map, region, address, value) \
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if(region.write) { \
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@ -580,9 +589,6 @@ class MemoryMap {
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map.shadow_base[is_shadowed][(®ion.write[address] - map.ram_base) & map.shadow_mask[_mm_is_shadowed]] = *value; \
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}
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// const auto is_shadowed = region.flags & MemoryMap::Region::IsShadowed; \
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// map.shadow_base[is_shadowed][(®ion.write[address] - map.ram_base) & map.shadow_mask[is_shadowed]] = *value; \
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// Quick notes on ::IsShadowed contortions:
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//
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// The objective is to support shadowing:
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