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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/Instruction.hpp"
#include "../../InstructionSets/x86/Perform.hpp" #include "../../InstructionSets/x86/Perform.hpp"
#include "../../Components/8255/i8255.hpp"
#include "../../Numeric/RegisterSizes.hpp" #include "../../Numeric/RegisterSizes.hpp"
#include "../ScanProducer.hpp" #include "../ScanProducer.hpp"
@@ -22,6 +24,19 @@
namespace PCCompatible { 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 { class DMA {
public: public:
void flip_flop_reset() { void flip_flop_reset() {
@@ -529,9 +544,9 @@ struct Memory {
class IO { class IO {
public: 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) { switch(port) {
default: default:
if constexpr (std::is_same_v<IntT, uint8_t>) { if constexpr (std::is_same_v<IntT, uint8_t>) {
@@ -568,7 +583,7 @@ class IO {
case 0x0068: case 0x0069: case 0x006a: case 0x006b: case 0x0068: case 0x0069: case 0x006a: case 0x006b:
case 0x006c: case 0x006d: case 0x006e: case 0x006f: case 0x006c: case 0x006d: case 0x006e: case 0x006f:
// Likely to be helpful: https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol // 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; break;
case 0x0080: case 0x0081: case 0x0082: case 0x0083: case 0x0080: case 0x0081: case 0x0082: case 0x0083:
@@ -621,8 +636,7 @@ class IO {
case 0x0064: case 0x0065: case 0x0066: case 0x0067: case 0x0064: case 0x0065: case 0x0066: case 0x0067:
case 0x0068: case 0x0069: case 0x006a: case 0x006b: case 0x0068: case 0x0069: case 0x006a: case 0x006b:
case 0x006c: case 0x006d: case 0x006e: case 0x006f: case 0x006c: case 0x006d: case 0x006e: case 0x006f:
printf("TODO: PPI read from %04x\n", port); return ppi_.read(port);
break;
} }
return IntT(~0); return IntT(~0);
} }
@@ -630,6 +644,7 @@ class IO {
private: private:
PIT<false> &pit_; PIT<false> &pit_;
DMA &dma_; DMA &dma_;
PPI &ppi_;
}; };
class FlowController { class FlowController {
@@ -681,7 +696,7 @@ class ConcreteMachine:
ConcreteMachine( ConcreteMachine(
[[maybe_unused]] const Analyser::Static::Target &target, [[maybe_unused]] const Analyser::Static::Target &target,
const ROMMachine::ROMFetcher &rom_fetcher 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. // 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; 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. 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: private:
PIT<false> pit_; PIT<false> pit_;
DMA dma_; DMA dma_;
i8255PortHandler ppi_handler_;
PPI ppi_;
struct Context { struct Context {
Context(PIT<false> &pit, DMA &dma) : Context(PIT<false> &pit, DMA &dma, PPI &ppi) :
segments(registers), segments(registers),
memory(registers, segments), memory(registers, segments),
flow_controller(registers, segments), flow_controller(registers, segments),
io(pit, dma) io(pit, dma, ppi)
{ {
reset(); reset();
} }