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Capture some basics.

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BIOS now seems to get as far as expecting channel 0 to trigger an interrupt, which never comes.
This commit is contained in:
Thomas Harte 2023-11-20 15:36:52 -05:00
parent 18ddc2c83a
commit d3e90ce006
1 changed files with 64 additions and 5 deletions
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69
Machines/PCCompatible/PCCompatible.cpp
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@ -24,18 +24,77 @@
namespace PCCompatible { namespace PCCompatible {
// Cf. https://helppc.netcore2k.net/hardware/pic
class PIC { class PIC {
public: public:
template <int address> template <int address>
void write(uint8_t value) { void write(uint8_t value) {
if(address) {
if(config_.word >= 0) {
switch(config_.word) {
case 0:
vector_base_ = value;
break;
case 1:
if(config_.has_fourth_word) {
// TODO:
//
// (1) slave mask if this is a master;
// (2) master interrupt attachment if this is a slave.
}
[[fallthrough]];
break;
case 2:
auto_eoi_ = value & 2;
break;
}
++config_.word;
if(config_.word == (config_.has_fourth_word ? 3 : 2)) {
config_.word = -1;
}
} else {
mask_ = value;
}
} else {
if(value & 0x10) {
config_.word = 0;
config_.has_fourth_word = value & 1;
if(!config_.has_fourth_word) {
auto_eoi_ = false;
}
single_pic_ = value & 2;
four_byte_vectors_ = value & 4;
level_triggered_ = value & 8;
}
}
printf("PIC: %02x to %d\n", value, address); printf("PIC: %02x to %d\n", value, address);
} }
template <int address> template <int address>
uint8_t read() { uint8_t read() {
printf("PIC: %read from %d\n", address); printf("PIC: read from %d\n", address);
if(address) {
return mask_;
}
return 0; return 0;
} }
private:
bool single_pic_ = false;
bool four_byte_vectors_ = false;
bool level_triggered_ = false;
bool auto_eoi_ = false;
uint8_t vector_base_ = 0;
uint8_t mask_ = 0;
struct ConfgurationState {
int word;
bool has_fourth_word;
} config_;
}; };
class i8255PortHandler : public Intel::i8255::PortHandler { class i8255PortHandler : public Intel::i8255::PortHandler {
@ -143,12 +202,12 @@ class PIT {
public: public:
template <int channel> uint8_t read() { template <int channel> uint8_t read() {
const auto result = channels_[channel].read(); const auto result = channels_[channel].read();
printf("Read from %d; %02x\n", channel, result); printf("PIT: read from %d; %02x\n", channel, result);
return result; return result;
} }
template <int channel> void write(uint8_t value) { template <int channel> void write(uint8_t value) {
printf("Write to %d\n", channel); printf("PIT: write to %d\n", channel);
channels_[channel].write(value); channels_[channel].write(value);
} }
@ -161,7 +220,7 @@ class PIT {
return; return;
} }
printf("Set mode on %d\n", channel_id); printf("PIT: set mode on %d\n", channel_id);
Channel &channel = channels_[channel_id]; Channel &channel = channels_[channel_id];
switch((value >> 4) & 3) { switch((value >> 4) & 3) {
@ -186,7 +245,7 @@ class PIT {
// Set up operating mode. // Set up operating mode.
switch(channel.mode) { switch(channel.mode) {
default: default:
printf("%d switches to unimplemented mode %d\n", channel_id, int(channel.mode)); printf("PIT: %d switches to unimplemented mode %d\n", channel_id, int(channel.mode));
break; break;
case OperatingMode::InterruptOnTerminalCount: case OperatingMode::InterruptOnTerminalCount: