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Dealt with another source of repeating magic constants: the command numbers.

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This commit is contained in:
Thomas Harte 2017-08-15 11:06:10 -04:00
parent 7d132f81f7
commit 9d77f33611
1 changed files with 57 additions and 31 deletions
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88
Components/8272/i8272.cpp
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@ -52,6 +52,29 @@ using namespace Intel::i8272;
#define SetBadCylinder() (status_[2] |= 0x02)
#define SetMissingDataAddressMark() (status_[2] |= 0x01)
namespace {
const uint8_t CommandReadData = 0x06;
const uint8_t CommandReadDeletedData = 0x0c;
const uint8_t CommandWriteData = 0x05;
const uint8_t CommandWriteDeletedData = 0x09;
const uint8_t CommandReadTrack = 0x02;
const uint8_t CommandReadID = 0x0a;
const uint8_t CommandFormatTrack = 0x0d;
const uint8_t CommandScanLow = 0x11;
const uint8_t CommandScanLowOrEqual = 0x19;
const uint8_t CommandScanHighOrEqual = 0x1d;
const uint8_t CommandRecalibrate = 0x07;
const uint8_t CommandSeek = 0x0f;
const uint8_t CommandSenseInterruptStatus = 0x08;
const uint8_t CommandSpecify = 0x03;
const uint8_t CommandSenseDriveStatus = 0x04;
}
i8272::i8272(BusHandler &bus_handler, Cycles clock_rate, int clock_rate_multiplier, int revolutions_per_minute) :
Storage::Disk::MFMController(clock_rate, clock_rate_multiplier, revolutions_per_minute),
bus_handler_(bus_handler),
@ -260,11 +283,11 @@ void i8272::posit_event(int event_type) {
// If this is not clearly a command that's safe to carry out in parallel to a seek, end all seeks.
switch(command_[0] & 0x1f) {
case 0x03: // specify
case 0x04: // sense drive status
case 0x07: // recalibrate
case 0x08: // sense interrupt status
case 0x0f: // seek
case CommandSpecify:
case CommandSenseDriveStatus:
case CommandSenseInterruptStatus:
case CommandRecalibrate:
case CommandSeek:
break;
default:
@ -279,27 +302,30 @@ void i8272::posit_event(int event_type) {
// Jump to the proper place.
switch(command_[0] & 0x1f) {
case 0x06: // read data
case 0x0c: // read deleted data
case CommandReadData:
case CommandReadDeletedData:
goto read_data;
case 0x05: // write data
case 0x09: // write deleted data
case CommandWriteData:
case CommandWriteDeletedData:
goto write_data;
case 0x02: goto read_track;
case 0x0a: goto read_id;
case 0x0d: goto format_track;
case 0x11: goto scan_low;
case 0x19: goto scan_low_or_equal;
case 0x1d: goto scan_high_or_equal;
case 0x07: goto recalibrate;
case 0x08: goto sense_interrupt_status;
case 0x03: goto specify;
case 0x04: goto sense_drive_status;
case 0x0f: goto seek;
case CommandReadTrack: goto read_track;
case CommandReadID: goto read_id;
case CommandFormatTrack: goto format_track;
default: goto invalid;
case CommandScanLow: goto scan_low;
case CommandScanLowOrEqual: goto scan_low_or_equal;
case CommandScanHighOrEqual: goto scan_high_or_equal;
case CommandRecalibrate: goto recalibrate;
case CommandSeek: goto seek;
case CommandSenseInterruptStatus: goto sense_interrupt_status;
case CommandSpecify: goto specify;
case CommandSenseDriveStatus: goto sense_drive_status;
default: goto invalid;
}
// Decodes drive, head and density, loads the head, loads the internal cylinder, head, sector and size registers,
@ -335,16 +361,16 @@ void i8272::posit_event(int event_type) {
// Branch to whatever is supposed to happen next
printf("Proceeding\n");
switch(command_[0] & 0x1f) {
case 0x06: // read data
case 0x0c: // read deleted data
case CommandReadData:
case CommandReadDeletedData:
goto read_data_found_header;
case 0x05: // write data
goto write_data_found_header;
case 0x09: // write deleted data
case CommandWriteData: // write data
case CommandWriteDeletedData: // write deleted data
goto write_data_found_header;
}
// Sets abnormal termination of the current command and proceeds to an ST0, ST1, ST2, C, H, R, N result phase.
abort_read_write:
SetAbnormalTermination();
@ -352,7 +378,7 @@ void i8272::posit_event(int event_type) {
// Performs the read data or read deleted data command.
read_data:
printf("Read [deleted] data [%02x %02x %02x %02x ... %02x]\n", command_[2], command_[3], command_[4], command_[5], command_[8]);
printf("Read [deleted] data [%02x %02x %02x %02x ... %02x %02x]\n", command_[2], command_[3], command_[4], command_[5], command_[6], command_[8]);
if(!dma_mode_) SetNonDMAExecution();
SET_DRIVE_HEAD_MFM();
read_next_data:
@ -362,7 +388,7 @@ void i8272::posit_event(int event_type) {
// flag doesn't match the sort the command was looking for.
read_data_found_header:
FIND_DATA();
if((get_latest_token().type == Token::Data) != ((command_[0]&0xf) == 0x6)) {
if((get_latest_token().type == Token::Data) != ((command_[0] & 0x1f) == CommandReadData)) {
if(!(command_[0]&0x20)) {
// SK is not set; set the error flag but read this sector before finishing.
SetControlMark();
@ -420,7 +446,7 @@ void i8272::posit_event(int event_type) {
goto post_st012chrn;
write_data:
printf("Write [deleted] data [%02x %02x %02x %02x ... %02x]\n", command_[2], command_[3], command_[4], command_[5], command_[8]);
printf("Write [deleted] data [%02x %02x %02x %02x ... %02x %02x]\n", command_[2], command_[3], command_[4], command_[5], command_[6], command_[8]);
if(!dma_mode_) SetNonDMAExecution();
SET_DRIVE_HEAD_MFM();
@ -435,7 +461,7 @@ void i8272::posit_event(int event_type) {
write_data_found_header:
begin_writing();
write_id_data_joiner((command_[0] & 0x1f) == 0x09);
write_id_data_joiner((command_[0] & 0x1f) == CommandWriteDeletedData);
SetDataDirectionFromProcessor();
SetDataRequest();
@ -462,7 +488,7 @@ void i8272::posit_event(int event_type) {
WAIT_FOR_EVENT(Event::DataWritten);
end_writing();
if(sector_ != command_[6] && !ControlMark()) {
if(sector_ != command_[6]) {
sector_++;
goto write_next_data;
}