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Install BIOS, albeit in writeable storage.

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This commit is contained in:
Thomas Harte 2023-11-15 22:02:53 -05:00
parent 2bc9dfbef9
commit 62b6219763
1 changed files with 16 additions and 1 deletions
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17
Machines/PCCompatible/PCCompatible.cpp
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@ -120,6 +120,7 @@ struct Memory {
// Constructor.
Memory(Registers &registers, const Segments &segments) : registers_(registers), segments_(segments) {
memory.resize(1024*1024);
std::fill(memory.begin(), memory.end(), 0xff);
}
//
@ -217,6 +218,13 @@ struct Memory {
return std::make_pair(memory.data(), 0x10'000);
}
//
// Population.
//
void install(size_t address, const uint8_t *data, size_t length) {
std::copy(data, data + length, memory.begin() + address);
}
private:
std::vector<uint8_t> memory;
Registers &registers_;
@ -315,11 +323,16 @@ class ConcreteMachine:
set_clock_rate(3'000'000);
// Fetch the BIOS. [8088 only, for now]
ROM::Request request = ROM::Request(ROM::Name::PCCompatibleGLaBIOS);
const auto bios = ROM::Name::PCCompatibleGLaBIOS;
ROM::Request request = ROM::Request(bios);
auto roms = rom_fetcher(request);
if(!request.validate(roms)) {
throw ROMMachine::Error::MissingROMs;
}
const auto &bios_contents = roms.find(bios)->second;
context.memory.install(0x10'0000 - bios_contents.size(), bios_contents.data(), bios_contents.size());
}
// MARK: - TimedMachine.
@ -338,6 +351,8 @@ class ConcreteMachine:
const auto all = context.memory.all();
decoded = decoder.decode(all.first, all.second);
}
context.registers.ip() += decoded.first;
} else {
context.flow_controller.begin_instruction();
}