128 lines
3.0 KiB
C++
128 lines
3.0 KiB
C++
#include "LuaCpu.hpp"
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#include <lucore/Logger.hpp>
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#include "LuaDevice.hpp"
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#include "LuaHelpers.hpp"
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// this is temporary from the thing
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/// simple 16550 UART implementation
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struct SimpleUartDevice : public riscv::Bus::MmioDevice {
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constexpr static riscv::Address BASE_ADDRESS = 0x10000000;
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riscv::Address Base() const override { return BASE_ADDRESS; }
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riscv::Address Size() const override { return 12; } // for now
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u32 Peek(riscv::Address address) override {
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switch(address) {
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case BASE_ADDRESS: return '\0'; // just return 0 for the input register
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case BASE_ADDRESS + 5: return 0x60; // active, but no keyboard input
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}
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return 0;
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}
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void Poke(riscv::Address address, u32 value) override {
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if(address == BASE_ADDRESS) {
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char c = value & 0x000000ff;
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std::fputc(c, stderr);
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}
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}
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};
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LUA_CLASS_BIND_VARIABLES_IMPLEMENT(LuaCpu);
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LUA_MEMBER_FUNCTION_IMPLEMENT(LuaCpu, PoweredOn) {
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auto self = LUA_CLASS_GET(LuaCpu)(1);
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LUA->PushBool(self->poweredOn);
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return 1;
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}
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LUA_MEMBER_FUNCTION_IMPLEMENT(LuaCpu, Cycle) {
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auto self = LUA_CLASS_GET(LuaCpu)(1);
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if(!self->poweredOn)
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return 0;
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self->system->Step();
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return 0;
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}
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LUA_MEMBER_FUNCTION_IMPLEMENT(LuaCpu, PowerOff) {
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auto self = LUA_CLASS_GET(LuaCpu)(1);
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if(!self->poweredOn)
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return 0;
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self->poweredOn = false;
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self->system->bus->Reset();
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return 0;
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}
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LUA_MEMBER_FUNCTION_IMPLEMENT(LuaCpu, PowerOn) {
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auto self = LUA_CLASS_GET(LuaCpu)(1);
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if(self->poweredOn)
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return 0;
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self->poweredOn = true;
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self->system->bus->Reset();
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return 0;
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}
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LUA_MEMBER_FUNCTION_IMPLEMENT(LuaCpu, Reset) {
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auto self = LUA_CLASS_GET(LuaCpu)(1);
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self->system->bus->Reset();
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return 0;
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}
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LUA_MEMBER_FUNCTION_IMPLEMENT(LuaCpu, AttachDevice) {
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auto self = LUA_CLASS_GET(LuaCpu)(1);
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auto device = LuaDevice::FromLua(LUA, 2);
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// Attach it
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LUA->PushBool(self->system->bus->AttachDevice(static_cast<riscv::Bus::Device*>(device)));
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return 1;
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}
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void LuaCpu::Bind(GarrysMod::Lua::ILuaBase* LUA) {
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// clang-format off
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LUA_CLASS_BIND_BEGIN(LuaCpu);
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LUA_SET_C_FUNCTION(PoweredOn);
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LUA_SET_C_FUNCTION(Cycle);
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LUA_SET_C_FUNCTION(PowerOff);
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LUA_SET_C_FUNCTION(PowerOn);
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LUA_SET_C_FUNCTION(Reset);
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LUA_SET_C_FUNCTION(AttachDevice);
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LUA_CLASS_BIND_END();
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// clang-format on
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}
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void LuaCpu::Create(GarrysMod::Lua::ILuaBase* LUA, u32 memorySize) {
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auto cpuWrapper = new LuaCpu(memorySize);
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// lame test code. this WILL be removed, I just want this for a quick test
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cpuWrapper->system->bus->AttachDevice(new SimpleUartDevice);
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auto fp = std::fopen("/home/lily/test-gmod.bin", "rb");
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if(fp) {
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std::fseek(fp, 0, SEEK_END);
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auto len = std::ftell(fp);
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std::fseek(fp, 0, SEEK_SET);
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std::fread(cpuWrapper->system->ram->Raw(), 1, len, fp);
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std::fclose(fp);
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}
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LUA->PushUserType(cpuWrapper, __lua_typeid);
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}
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LuaCpu::LuaCpu(u32 memorySize) {
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poweredOn = true;
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system = riscv::System::Create(memorySize);
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system->OnPowerOff = [&]() {
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poweredOn = false;
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system->bus->Reset();
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};
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}
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LuaCpu::~LuaCpu() {
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delete system;
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}
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