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Start to establish a memory map.

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This commit is contained in:
Thomas Harte 2024-03-04 21:43:06 -05:00
parent b7a1363add
commit 387791635e
1 changed files with 60 additions and 1 deletions
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61
Machines/Acorn/Archimedes/Archimedes.cpp
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@ -20,8 +20,44 @@
#include <array>
#include <vector>
namespace {
enum class Zone {
LogicallyMappedRAM,
PhysicallyMappedRAM,
IOControllers,
LowROM,
HighROM,
VideoController,
DMAAndMEMC,
AddressTranslator,
};
constexpr std::array<Zone, 0x20> zones(bool is_read) {
std::array<Zone, 0x20> zones{};
for(size_t c = 0; c < zones.size(); c++) {
const auto address = c << 21;
if(address < 0x200'0000) {
zones[c] = Zone::LogicallyMappedRAM;
} else if(address < 0x300'0000) {
zones[c] = Zone::PhysicallyMappedRAM;
} else if(address < 0x340'0000) {
zones[c] = Zone::IOControllers;
} else if(address < 0x360'0000) {
zones[c] = is_read ? Zone::LowROM : Zone::VideoController;
} else if(address < 0x380'0000) {
zones[c] = is_read ? Zone::LowROM : Zone::DMAAndMEMC;
} else {
zones[c] = is_read ? Zone::HighROM : Zone::AddressTranslator;
}
}
return zones;
}
}
namespace Archimedes {
/// Primarily models the MEMC.
struct Memory {
void set_rom(const std::vector<uint8_t> &rom) {
std::copy(
@ -35,7 +71,19 @@ struct Memory {
(void)mode;
(void)trans;
printf("W of %08x to %08x [%lu]\n", source, address, sizeof(IntT));
switch (write_zones_[(address >> 21) & 31]) {
case Zone::DMAAndMEMC:
// if(mode != InstructionSet::ARM::Mode::Supervisor) return false;
if((address & 0b1110'0000'0000'0000'0000) == 0b1110'0000'0000'0000'0000) {
printf("MEMC Control: %04x\n", source);
break;
}
[[fallthrough]];
default:
printf("Unhandled W of %08x to %08x [%lu]\n", source, address, sizeof(IntT));
break;
}
if(has_moved_rom_ && address < ram_.size()) {
*reinterpret_cast<IntT *>(&ram_[address]) = source;
@ -49,6 +97,14 @@ struct Memory {
(void)mode;
(void)trans;
switch (read_zones_[(address >> 21) & 31]) {
case Zone::PhysicallyMappedRAM:
// if(mode != InstructionSet::ARM::Mode::Supervisor) return false;
source = *reinterpret_cast<const IntT *>(&ram_[address & (ram_.size() - 1)]);
return true;
default: break;
}
if(address >= 0x3800000) {
has_moved_rom_ = true;
source = *reinterpret_cast<const IntT *>(&rom_[address - 0x3800000]);
@ -68,6 +124,9 @@ struct Memory {
bool has_moved_rom_ = false;
std::array<uint8_t, 4*1024*1024> ram_{};
std::array<uint8_t, 2*1024*1024> rom_;
static constexpr std::array<Zone, 0x20> read_zones_ = zones(true);
static constexpr std::array<Zone, 0x20> write_zones_ = zones(false);
};
class ConcreteMachine: