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Add an agent for floppy control.

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This commit is contained in:
Thomas Harte 2023-11-24 22:19:39 -05:00
parent af70c8847d
commit 2efb5236f7
1 changed files with 51 additions and 7 deletions
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58
Machines/PCCompatible/PCCompatible.cpp
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@ -20,6 +20,7 @@
#include "../../Components/6845/CRTC6845.hpp"
#include "../../Components/8255/i8255.hpp"
#include "../../Components/8272/CommandDecoder.hpp"
#include "../../Components/AudioToggle/AudioToggle.hpp"
#include "../../Numeric/RegisterSizes.hpp"
@ -37,6 +38,41 @@
namespace PCCompatible {
class FloppyController {
public:
FloppyController(PIC &pic, DMA &dma) : pic_(pic), dma_(dma) {}
void set_digital_output(uint8_t control) {
// b7, b6, b5, b4: enable motor for drive 4, 3, 2, 1;
// b3: 1 => enable DMA; 0 => disable;
// b2: 1 => enable FDC; 0 => hold at reset;
// b1, b0: drive select.
enable_dma_ = control & 0x08;
const bool hold_reset = !(control & 0x04);
if(!hold_reset && hold_reset_) {
reset();
}
hold_reset_ = hold_reset;
}
private:
void reset() {
decoder_.clear();
// TODO: And?
// pic_.apply_edge<6>(true);
}
PIC &pic_;
DMA &dma_;
bool hold_reset_ = false;
bool enable_dma_ = false;
Intel::i8272::CommandDecoder decoder_;
};
class KeyboardController {
public:
KeyboardController(PIC &pic) : pic_(pic) {}
@ -347,7 +383,8 @@ using PIT = i8237<false, PITObserver>;
class i8255PortHandler : public Intel::i8255::PortHandler {
// Likely to be helpful: https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol
public:
i8255PortHandler(PCSpeaker &speaker, KeyboardController &keyboard) : speaker_(speaker), keyboard_(keyboard) {}
i8255PortHandler(PCSpeaker &speaker, KeyboardController &keyboard) :
speaker_(speaker), keyboard_(keyboard) {}
void set_value(int port, uint8_t value) {
switch(port) {
@ -684,8 +721,8 @@ struct Memory {
class IO {
public:
IO(PIT &pit, DMA &dma, PPI &ppi, PIC &pic, MDA &mda) :
pit_(pit), dma_(dma), ppi_(ppi), pic_(pic), mda_(mda) {}
IO(PIT &pit, DMA &dma, PPI &ppi, PIC &pic, MDA &mda, FloppyController &fdc) :
pit_(pit), dma_(dma), ppi_(ppi), pic_(pic), mda_(mda), fdc_(fdc) {}
template <typename IntT> void out(uint16_t port, IntT value) {
switch(port) {
@ -772,7 +809,11 @@ class IO {
// Ignore CGA accesses.
break;
case 0x03f0: case 0x03f1: case 0x03f2: case 0x03f3:
case 0x03f2:
fdc_.set_digital_output(uint8_t(value));
break;
case 0x03f3:
case 0x03f4: case 0x03f5: case 0x03f6: case 0x03f7:
printf("TODO: FDC write of %02x at %04x\n", value, port);
break;
@ -862,6 +903,7 @@ class IO {
PPI &ppi_;
PIC &pic_;
MDA &mda_;
FloppyController &fdc_;
};
class FlowController {
@ -914,11 +956,12 @@ class ConcreteMachine:
const ROMMachine::ROMFetcher &rom_fetcher
) :
keyboard_(pic_),
fdc_(pic_, dma_),
pit_observer_(pic_, speaker_),
ppi_handler_(speaker_, keyboard_),
pit_(pit_observer_),
ppi_(ppi_handler_),
context(pit_, dma_, ppi_, pic_, mda_)
context(pit_, dma_, ppi_, pic_, mda_, fdc_)
{
// 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;
@ -1071,6 +1114,7 @@ class ConcreteMachine:
MDA mda_;
KeyboardController keyboard_;
FloppyController fdc_;
PITObserver pit_observer_;
i8255PortHandler ppi_handler_;
@ -1080,11 +1124,11 @@ class ConcreteMachine:
PCCompatible::KeyboardMapper keyboard_mapper_;
struct Context {
Context(PIT &pit, DMA &dma, PPI &ppi, PIC &pic, MDA &mda) :
Context(PIT &pit, DMA &dma, PPI &ppi, PIC &pic, MDA &mda, FloppyController &fdc) :
segments(registers),
memory(registers, segments),
flow_controller(registers, segments),
io(pit, dma, ppi, pic, mda)
io(pit, dma, ppi, pic, mda, fdc)
{
reset();
}