mirror of
https://github.com/TomHarte/CLK.git
synced 2024-12-26 09:29:45 +00:00
Reaching the end of the usable part of my day, decided to tidy up a little before bed with indentation that reflects a distinction between top-level entry points and mere loops.
This commit is contained in:
Thomas Harte
parent
3853966a1e
commit
73f8488150
@ -143,120 +143,117 @@ void i8272::posit_event(int event_type) {
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BEGIN_SECTION();
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wait_for_command:
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set_data_mode(Storage::Disk::MFMController::DataMode::Scanning);
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main_status_ &= ~(StatusCB | StatusNDM);
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command_.clear();
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set_data_mode(Storage::Disk::MFMController::DataMode::Scanning);
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main_status_ &= ~(StatusCB | StatusNDM);
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command_.clear();
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wait_for_complete_command_sequence:
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main_status_ |= StatusRQM;
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WAIT_FOR_EVENT(Event8272::CommandByte)
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// printf(".");
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main_status_ |= StatusCB;
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main_status_ &= ~StatusRQM;
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main_status_ |= StatusRQM;
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WAIT_FOR_EVENT(Event8272::CommandByte)
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main_status_ |= StatusCB;
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main_status_ &= ~StatusRQM;
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switch(command_[0] & 0x1f) {
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case 0x06: // read data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto read_data;
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switch(command_[0] & 0x1f) {
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case 0x06: // read data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto read_data;
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case 0x0b: // read deleted data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto read_deleted_data;
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case 0x0b: // read deleted data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto read_deleted_data;
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case 0x05: // write data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto write_data;
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case 0x05: // write data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto write_data;
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case 0x09: // write deleted data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto write_deleted_data;
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case 0x09: // write deleted data
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto write_deleted_data;
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case 0x02: // read track
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto read_track;
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case 0x02: // read track
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto read_track;
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case 0x0a: // read ID
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if(command_.size() < 2) goto wait_for_complete_command_sequence;
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goto read_id;
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case 0x0a: // read ID
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if(command_.size() < 2) goto wait_for_complete_command_sequence;
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goto read_id;
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case 0x0d: // format track
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if(command_.size() < 6) goto wait_for_complete_command_sequence;
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goto format_track;
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case 0x0d: // format track
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if(command_.size() < 6) goto wait_for_complete_command_sequence;
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goto format_track;
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case 0x11: // scan low
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto scan_low;
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case 0x11: // scan low
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto scan_low;
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case 0x19: // scan low or equal
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto scan_low_or_equal;
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case 0x19: // scan low or equal
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto scan_low_or_equal;
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case 0x1d: // scan high or equal
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto scan_high_or_equal;
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case 0x1d: // scan high or equal
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if(command_.size() < 9) goto wait_for_complete_command_sequence;
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goto scan_high_or_equal;
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case 0x07: // recalibrate
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if(command_.size() < 2) goto wait_for_complete_command_sequence;
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goto recalibrate;
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case 0x07: // recalibrate
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if(command_.size() < 2) goto wait_for_complete_command_sequence;
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goto recalibrate;
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case 0x08: // sense interrupt status
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goto sense_interrupt_status;
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case 0x08: // sense interrupt status
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goto sense_interrupt_status;
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case 0x03: // specify
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if(command_.size() < 3) goto wait_for_complete_command_sequence;
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goto specify;
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case 0x03: // specify
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if(command_.size() < 3) goto wait_for_complete_command_sequence;
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goto specify;
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case 0x04: // sense drive status
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if(command_.size() < 2) goto wait_for_complete_command_sequence;
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goto sense_drive_status;
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case 0x04: // sense drive status
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if(command_.size() < 2) goto wait_for_complete_command_sequence;
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goto sense_drive_status;
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case 0x0f: // seek
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if(command_.size() < 3) goto wait_for_complete_command_sequence;
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goto seek;
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case 0x0f: // seek
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if(command_.size() < 3) goto wait_for_complete_command_sequence;
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goto seek;
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default: // invalid
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goto invalid;
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}
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default: // invalid
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goto invalid;
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}
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read_data:
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printf("Read data, sector %02x %02x %02x %02x\n", command_[2], command_[3], command_[4], command_[5]);
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SET_DRIVE_HEAD_MFM();
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cylinder_ = command_[2];
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head_ = command_[3];
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sector_ = command_[4];
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size_ = command_[5];
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printf("Read data, sector %02x %02x %02x %02x\n", command_[2], command_[3], command_[4], command_[5]);
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SET_DRIVE_HEAD_MFM();
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cylinder_ = command_[2];
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head_ = command_[3];
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sector_ = command_[4];
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size_ = command_[5];
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index_hole_limit_ = 2;
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find_next_sector:
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FIND_HEADER();
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if(!index_hole_limit_) goto read_data_not_found;
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READ_HEADER();
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// printf("Comparing with %02x\n", header_[2]);
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if(header_[0] != cylinder_ || header_[1] != head_ || header_[2] != sector_ || header_[3] != size_) goto find_next_sector;
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index_hole_limit_ = 2;
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find_next_sector:
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FIND_HEADER();
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if(!index_hole_limit_) goto read_data_not_found;
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READ_HEADER();
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if(header_[0] != cylinder_ || header_[1] != head_ || header_[2] != sector_ || header_[3] != size_) goto find_next_sector;
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FIND_DATA();
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distance_into_section_ = 0;
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set_data_mode(Reading);
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FIND_DATA();
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distance_into_section_ = 0;
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set_data_mode(Reading);
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get_byte:
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WAIT_FOR_EVENT(Event::Token);
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result_stack_.push_back(get_latest_token().byte_value);
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distance_into_section_++;
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main_status_ |= StatusRQM | StatusDIO;
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WAIT_FOR_EVENT(Event8272::ResultEmpty);
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main_status_ &= ~StatusRQM;
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if(distance_into_section_ < (128 << size_)) goto get_byte;
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get_byte:
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WAIT_FOR_EVENT(Event::Token);
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result_stack_.push_back(get_latest_token().byte_value);
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distance_into_section_++;
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main_status_ |= StatusRQM | StatusDIO;
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WAIT_FOR_EVENT(Event8272::ResultEmpty);
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main_status_ &= ~StatusRQM;
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if(distance_into_section_ < (128 << size_)) goto get_byte;
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set_data_mode(Scanning);
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goto post_st012chrn;
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set_data_mode(Scanning);
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goto return_st012chrn;
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read_data_not_found:
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printf("Not found\n");
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read_data_not_found:
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printf("Not found\n");
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status_[1] |= 0x4;
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status_[0] = 0x40; // (status_[0] & ~0xc0) |
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goto return_st012chrn;
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status_[1] |= 0x4;
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status_[0] = 0x40; // (status_[0] & ~0xc0) |
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goto post_st012chrn;
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read_deleted_data:
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printf("Read deleted data unimplemented!!\n");
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@ -275,37 +272,27 @@ void i8272::posit_event(int event_type) {
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goto wait_for_command;
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read_id:
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printf("Read ID\n");
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SET_DRIVE_HEAD_MFM();
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printf("Read ID\n");
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SET_DRIVE_HEAD_MFM();
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index_hole_limit_ = 2;
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read_id_find_next_sector:
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FIND_HEADER();
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if(!index_hole_limit_) goto read_id_not_found;
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READ_HEADER();
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index_hole_limit_ = 2;
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read_id_find_next_sector:
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FIND_HEADER();
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if(!index_hole_limit_) goto read_id_not_found;
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READ_HEADER();
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cylinder_ = header_[0];
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head_ = header_[1];
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sector_ = header_[2];
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size_ = header_[3];
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cylinder_ = header_[0];
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head_ = header_[1];
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sector_ = header_[2];
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size_ = header_[3];
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goto return_st012chrn;
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goto post_st012chrn;
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read_id_not_found:
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status_[1] |= 0x4;
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status_[0] = 0x40; // (status_[0] & ~0xc0) |
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read_id_not_found:
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status_[1] |= 0x4;
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status_[0] = 0x40;
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return_st012chrn:
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result_stack_.push_back(size_);
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result_stack_.push_back(sector_);
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result_stack_.push_back(head_);
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result_stack_.push_back(cylinder_);
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result_stack_.push_back(status_[2]);
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result_stack_.push_back(status_[1]);
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result_stack_.push_back(status_[0]);
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goto post_result;
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goto post_st012chrn;
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format_track:
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printf("Fromat track unimplemented!!\n");
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@ -325,67 +312,77 @@ void i8272::posit_event(int event_type) {
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recalibrate:
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seek:
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printf((command_.size() > 2) ? "Seek\n" : "Recalibrate\n");
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if(drives_[command_[1]&3].phase != Drive::Seeking) {
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status_[0] = status_[1] = status_[2] = 0;
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drives_[command_[1]&3].phase = Drive::Seeking;
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drives_[command_[1]&3].steps_taken = 0;
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drives_[command_[1]&3].target_head_position = (command_.size() > 2) ? command_[2] : -1;
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drives_[command_[1]&3].step_rate_counter = 0;
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main_status_ |= 1 << (command_[1]&3);
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}
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goto wait_for_command;
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printf((command_.size() > 2) ? "Seek\n" : "Recalibrate\n");
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if(drives_[command_[1]&3].phase != Drive::Seeking) {
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status_[0] = status_[1] = status_[2] = 0;
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drives_[command_[1]&3].phase = Drive::Seeking;
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drives_[command_[1]&3].steps_taken = 0;
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drives_[command_[1]&3].target_head_position = (command_.size() > 2) ? command_[2] : -1;
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drives_[command_[1]&3].step_rate_counter = 0;
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main_status_ |= 1 << (command_[1]&3);
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}
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goto wait_for_command;
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sense_interrupt_status:
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printf("Sense interrupt status\n");
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// Find the first drive that is in the CompletedSeeking state and return for that;
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// if none has done so then return a single 0x80.
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{
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int found_drive = -1;
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for(int c = 0; c < 4; c++) {
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if(drives_[c].phase == Drive::CompletedSeeking) {
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found_drive = c;
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break;
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printf("Sense interrupt status\n");
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// Find the first drive that is in the CompletedSeeking state and return for that;
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// if none has done so then return a single 0x80.
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{
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int found_drive = -1;
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for(int c = 0; c < 4; c++) {
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if(drives_[c].phase == Drive::CompletedSeeking) {
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found_drive = c;
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break;
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}
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}
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if(found_drive != -1) {
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drives_[found_drive].phase = Drive::NotSeeking;
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status_[0] = (uint8_t)found_drive | 0x20;
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main_status_ &= ~(1 << found_drive);
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result_stack_.push_back(drives_[found_drive].head_position);
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result_stack_.push_back(status_[0]);
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} else {
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result_stack_.push_back(0x80);
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}
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}
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if(found_drive != -1) {
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drives_[found_drive].phase = Drive::NotSeeking;
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status_[0] = (uint8_t)found_drive | 0x20;
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main_status_ &= ~(1 << found_drive);
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result_stack_.push_back(drives_[found_drive].head_position);
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result_stack_.push_back(status_[0]);
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} else {
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result_stack_.push_back(0x80);
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}
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}
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goto post_result;
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goto post_result;
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specify:
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printf("Specify\n");
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step_rate_time_ = command_[1] &0xf0; // i.e. 16 to 240m
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head_unload_time_ = command_[1] & 0x0f; // i.e. 1 to 16ms
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head_load_time_ = command_[2] & ~1; // i.e. 2 to 254 ms in increments of 2ms
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dma_mode_ = !(command_[2] & 1);
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goto wait_for_command;
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step_rate_time_ = command_[1] &0xf0; // i.e. 16 to 240m
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head_unload_time_ = command_[1] & 0x0f; // i.e. 1 to 16ms
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head_load_time_ = command_[2] & ~1; // i.e. 2 to 254 ms in increments of 2ms
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dma_mode_ = !(command_[2] & 1);
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goto wait_for_command;
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sense_drive_status:
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printf("Sense drive status unimplemented!!\n");
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// result_stack_.push_back(status_[3]);
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goto post_result;
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goto wait_for_command;
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invalid:
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// A no-op, causing the FDC to go back into standby mode.
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goto wait_for_command;
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// A no-op, causing the FDC to go back into standby mode.
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goto wait_for_command;
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post_st012chrn:
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result_stack_.push_back(size_);
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result_stack_.push_back(sector_);
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result_stack_.push_back(head_);
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result_stack_.push_back(cylinder_);
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result_stack_.push_back(status_[2]);
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result_stack_.push_back(status_[1]);
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result_stack_.push_back(status_[0]);
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goto post_result;
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post_result:
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// Set ready to send data to the processor, no longer in non-DMA execution phase.
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main_status_ |= StatusRQM | StatusDIO;
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main_status_ &= ~StatusNDM;
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// Set ready to send data to the processor, no longer in non-DMA execution phase.
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main_status_ |= StatusRQM | StatusDIO;
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main_status_ &= ~StatusNDM;
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WAIT_FOR_EVENT(Event8272::ResultEmpty);
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main_status_ &= ~StatusDIO;
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goto wait_for_command;
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WAIT_FOR_EVENT(Event8272::ResultEmpty);
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main_status_ &= ~StatusDIO;
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goto wait_for_command;
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END_SECTION()
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}
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