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Bring an 8255 into the mix.

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This commit is contained in:
Thomas Harte 2023-11-20 12:13:42 -05:00
parent 55f466f2fa
commit 7eed254de9
1 changed files with 25 additions and 8 deletions
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33
Machines/PCCompatible/PCCompatible.cpp
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@ -13,6 +13,8 @@
#include "../../InstructionSets/x86/Instruction.hpp"
#include "../../InstructionSets/x86/Perform.hpp"
#include "../../Components/8255/i8255.hpp"
#include "../../Numeric/RegisterSizes.hpp"
#include "../ScanProducer.hpp"
@ -22,6 +24,19 @@
namespace PCCompatible {
class i8255PortHandler : public Intel::i8255::PortHandler {
public:
void set_value(int port, uint8_t value) {
printf("PPI: %02x to %d\n", value, port);
}
uint8_t get_value(int port) {
printf("PPI: from %d\n", port);
return 0;
};
};
using PPI = Intel::i8255::i8255<i8255PortHandler>;
class DMA {
public:
void flip_flop_reset() {
@ -529,9 +544,9 @@ struct Memory {
class IO {
public:
IO(PIT<false> &pit, DMA &dma) : pit_(pit), dma_(dma) {}
IO(PIT<false> &pit, DMA &dma, PPI &ppi) : pit_(pit), dma_(dma), ppi_(ppi) {}
template <typename IntT> void out([[maybe_unused]] uint16_t port, [[maybe_unused]] IntT value) {
template <typename IntT> void out(uint16_t port, IntT value) {
switch(port) {
default:
if constexpr (std::is_same_v<IntT, uint8_t>) {
@ -568,7 +583,7 @@ class IO {
case 0x0068: case 0x0069: case 0x006a: case 0x006b:
case 0x006c: case 0x006d: case 0x006e: case 0x006f:
// Likely to be helpful: https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol
printf("TODO: PPI write of %02x at %04x\n", value, port);
ppi_.write(port, value);
break;
case 0x0080: case 0x0081: case 0x0082: case 0x0083:
@ -621,8 +636,7 @@ class IO {
case 0x0064: case 0x0065: case 0x0066: case 0x0067:
case 0x0068: case 0x0069: case 0x006a: case 0x006b:
case 0x006c: case 0x006d: case 0x006e: case 0x006f:
printf("TODO: PPI read from %04x\n", port);
break;
return ppi_.read(port);
}
return IntT(~0);
}
@ -630,6 +644,7 @@ class IO {
private:
PIT<false> &pit_;
DMA &dma_;
PPI &ppi_;
};
class FlowController {
@ -681,7 +696,7 @@ class ConcreteMachine:
ConcreteMachine(
[[maybe_unused]] const Analyser::Static::Target &target,
const ROMMachine::ROMFetcher &rom_fetcher
) : context(pit_, dma_) {
) : ppi_(ppi_handler_), context(pit_, dma_, ppi_) {
// Use clock rate as a MIPS count; keeping it as a multiple or divisor of the PIT frequency is easy.
static constexpr int pit_frequency = 1'193'182;
set_clock_rate(double(pit_frequency) * double(PitMultiplier) / double(PitDivisor)); // i.e. almost 0.4 MIPS for an XT.
@ -741,13 +756,15 @@ class ConcreteMachine:
private:
PIT<false> pit_;
DMA dma_;
i8255PortHandler ppi_handler_;
PPI ppi_;
struct Context {
Context(PIT<false> &pit, DMA &dma) :
Context(PIT<false> &pit, DMA &dma, PPI &ppi) :
segments(registers),
memory(registers, segments),
flow_controller(registers, segments),
io(pit, dma)
io(pit, dma, ppi)
{
reset();
}