mirror of
https://github.com/TomHarte/CLK.git
synced 2024-12-26 09:29:45 +00:00
Started on a real ugly-implementation coroutine approach, and implemented specify as a fairly trivial first command: it has no result phase, and is the only thing called by AMSDOS as part of the initialisation sequence.
This commit is contained in:
parent
77da582e88
commit
89f6de1383
@ -12,78 +12,41 @@
|
||||
|
||||
using namespace Intel;
|
||||
|
||||
namespace {
|
||||
const uint8_t StatusRQM = 0x80; // Set indicates: ready to send or receive from processor.
|
||||
}
|
||||
|
||||
i8272::i8272(Cycles clock_rate, int clock_rate_multiplier, int revolutions_per_minute) :
|
||||
Storage::Disk::MFMController(clock_rate, clock_rate_multiplier, revolutions_per_minute) {
|
||||
Storage::Disk::MFMController(clock_rate, clock_rate_multiplier, revolutions_per_minute),
|
||||
status_(StatusRQM),
|
||||
interesting_event_mask_((int)Event8272::CommandByte),
|
||||
resume_point_(0),
|
||||
delay_time_(0) {
|
||||
posit_event((int)Event8272::CommandByte);
|
||||
}
|
||||
|
||||
void i8272::run_for(Cycles cycles) {
|
||||
Storage::Disk::MFMController::run_for(cycles);
|
||||
if(delay_time_ > 0) {
|
||||
if(cycles.as_int() >= delay_time_) {
|
||||
delay_time_ = 0;
|
||||
posit_event((int)Event8272::Timer);
|
||||
} else {
|
||||
delay_time_ -= cycles.as_int();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void i8272::set_register(int address, uint8_t value) {
|
||||
// don't consider attempted sets to the status register
|
||||
if(!address) return;
|
||||
|
||||
// TODO: if not accepting commands, return
|
||||
// if not ready for commands, do nothing
|
||||
if(!(status_ & StatusRQM)) return;
|
||||
|
||||
// accumulate latest byte in the command byte sequence
|
||||
command_.push_back(value);
|
||||
size_t necessary_length;
|
||||
switch(command_[0] & 0x1f) {
|
||||
case 0x06: // read data
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x0b: // read deleted data
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x05: // write data
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x09: // write deleted data
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x02: // read track
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x0a: // read ID
|
||||
necessary_length = 2;
|
||||
break;
|
||||
case 0x0d: // format track
|
||||
necessary_length = 6;
|
||||
break;
|
||||
case 0x11: // scan low
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x19: // scan low or equal
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x1d: // scan high or equal
|
||||
necessary_length = 9;
|
||||
break;
|
||||
case 0x07: // recalibrate
|
||||
necessary_length = 2;
|
||||
break;
|
||||
case 0x08: // sense interrupt status
|
||||
necessary_length = 1;
|
||||
break;
|
||||
case 0x03: // specify
|
||||
necessary_length = 3;
|
||||
break;
|
||||
case 0x04: // sense drive status
|
||||
necessary_length = 2;
|
||||
break;
|
||||
case 0x0f: // seek
|
||||
necessary_length = 3;
|
||||
break;
|
||||
default: // invalid
|
||||
necessary_length = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
printf("8272 set register %d to %02x\n", address, value);
|
||||
|
||||
if(command_.size() == necessary_length) {
|
||||
printf("8272 Perform!\n");
|
||||
command_.clear();
|
||||
}
|
||||
posit_event((int)Event8272::CommandByte);
|
||||
}
|
||||
|
||||
uint8_t i8272::get_register(int address) {
|
||||
@ -92,9 +55,161 @@ uint8_t i8272::get_register(int address) {
|
||||
return 0xff;
|
||||
} else {
|
||||
printf("8272 get status\n");
|
||||
return 0x80;
|
||||
return status_;
|
||||
}
|
||||
}
|
||||
|
||||
void i8272::posit_event(Event type) {
|
||||
#define BEGIN_SECTION() switch(resume_point_) { default:
|
||||
#define END_SECTION() }
|
||||
|
||||
#define WAIT_FOR_EVENT(mask) resume_point_ = __LINE__; interesting_event_mask_ = (int)mask; return; case __LINE__:
|
||||
|
||||
void i8272::posit_event(int type) {
|
||||
if(!(interesting_event_mask_ & type)) return;
|
||||
interesting_event_mask_ &= ~type;
|
||||
|
||||
BEGIN_SECTION();
|
||||
|
||||
wait_for_command:
|
||||
set_data_mode(Storage::Disk::MFMController::DataMode::Scanning);
|
||||
command_.clear();
|
||||
|
||||
wait_for_complete_command_sequence:
|
||||
status_ |= StatusRQM;
|
||||
WAIT_FOR_EVENT(Event8272::CommandByte)
|
||||
status_ &= ~StatusRQM;
|
||||
|
||||
switch(command_[0] & 0x1f) {
|
||||
case 0x06: // read data
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto read_data;
|
||||
|
||||
case 0x0b: // read deleted data
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto read_deleted_data;
|
||||
|
||||
case 0x05: // write data
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto write_data;
|
||||
|
||||
case 0x09: // write deleted data
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto write_deleted_data;
|
||||
|
||||
case 0x02: // read track
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto read_track;
|
||||
|
||||
case 0x0a: // read ID
|
||||
if(command_.size() < 2) goto wait_for_complete_command_sequence;
|
||||
goto read_id;
|
||||
|
||||
case 0x0d: // format track
|
||||
if(command_.size() < 6) goto wait_for_complete_command_sequence;
|
||||
goto format_track;
|
||||
|
||||
case 0x11: // scan low
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto scan_low;
|
||||
|
||||
case 0x19: // scan low or equal
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto scan_low_or_equal;
|
||||
|
||||
case 0x1d: // scan high or equal
|
||||
if(command_.size() < 9) goto wait_for_complete_command_sequence;
|
||||
goto scan_high_or_equal;
|
||||
|
||||
case 0x07: // recalibrate
|
||||
if(command_.size() < 2) goto wait_for_complete_command_sequence;
|
||||
goto recalibrate;
|
||||
|
||||
case 0x08: // sense interrupt status
|
||||
goto sense_interrupt_status;
|
||||
|
||||
case 0x03: // specify
|
||||
if(command_.size() < 3) goto wait_for_complete_command_sequence;
|
||||
goto specify;
|
||||
|
||||
case 0x04: // sense drive status
|
||||
if(command_.size() < 2) goto wait_for_complete_command_sequence;
|
||||
goto sense_drive_status;
|
||||
|
||||
case 0x0f: // seek
|
||||
if(command_.size() < 3) goto wait_for_complete_command_sequence;
|
||||
goto seek;
|
||||
|
||||
default: // invalid
|
||||
goto invalid;
|
||||
}
|
||||
|
||||
read_data:
|
||||
printf("Read data unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
read_deleted_data:
|
||||
printf("Read deleted data unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
write_data:
|
||||
printf("Write data unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
write_deleted_data:
|
||||
printf("Write deleted data unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
read_track:
|
||||
printf("Read track unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
read_id:
|
||||
printf("Read ID unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
format_track:
|
||||
printf("Fromat track unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
scan_low:
|
||||
printf("Scan low unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
scan_low_or_equal:
|
||||
printf("Scan low or equal unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
scan_high_or_equal:
|
||||
printf("Scan high or equal unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
recalibrate:
|
||||
printf("Recalibrate unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
sense_interrupt_status:
|
||||
printf("Sense interrupt status unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
specify:
|
||||
printf("Specify");
|
||||
step_rate_time_ = command_[1] &0xf0; // i.e. 16 to 240m
|
||||
head_unload_time_ = command_[1] & 0x0f; // i.e. 1 to 16ms
|
||||
head_load_time_ = command_[2] & ~1; // i.e. 2 to 254 ms in increments of 2ms
|
||||
dma_mode_ = !(command_[2] & 1);
|
||||
goto wait_for_command;
|
||||
|
||||
sense_drive_status:
|
||||
printf("Sense drive status unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
seek:
|
||||
printf("Seek unimplemented!!");
|
||||
goto wait_for_command;
|
||||
|
||||
invalid:
|
||||
// A no-op, causing the FDC to go back into standby mode.
|
||||
goto wait_for_command;
|
||||
|
||||
END_SECTION()
|
||||
}
|
||||
|
@ -26,9 +26,24 @@ class i8272: public Storage::Disk::MFMController {
|
||||
uint8_t get_register(int address);
|
||||
|
||||
private:
|
||||
void posit_event(Event type);
|
||||
void posit_event(int type);
|
||||
uint8_t status_;
|
||||
std::vector<uint8_t> command_;
|
||||
|
||||
enum class Event8272: int {
|
||||
CommandByte = (1 << 3),
|
||||
Timer = (1 << 4),
|
||||
|
||||
};
|
||||
|
||||
int interesting_event_mask_;
|
||||
int resume_point_;
|
||||
int delay_time_;
|
||||
|
||||
int step_rate_time_;
|
||||
int head_unload_time_;
|
||||
int head_load_time_;
|
||||
bool dma_mode_;
|
||||
};
|
||||
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user