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Started withdrawing logging, reduced index hole count back to the correct number and tried to increase read_data rigour.

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This commit is contained in:
Thomas Harte 2017-08-15 20:12:01 -04:00
parent 7b92b235e1
commit 75a9d2bb33
1 changed files with 58 additions and 37 deletions
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95
Components/8272/i8272.cpp
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@ -204,7 +204,9 @@ void i8272::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive) {
#define FIND_DATA() \
set_data_mode(DataMode::Scanning); \
CONCAT(find_data, __LINE__): WAIT_FOR_EVENT((int)Event::Token | (int)Event::IndexHole); \
if(event_type == (int)Event::Token && get_latest_token().type != Token::Data && get_latest_token().type != Token::DeletedData) goto CONCAT(find_data, __LINE__);
if(event_type == (int)Event::Token) { \
if(get_latest_token().type == Token::Byte) goto CONCAT(find_data, __LINE__); \
}
#define READ_HEADER() \
distance_into_section_ = 0; \
@ -351,27 +353,33 @@ void i8272::posit_event(int event_type) {
// Sets a maximum index hole limit of 2 then performs a find header/read header loop, continuing either until
// the index hole limit is breached or a sector is found with a cylinder, head, sector and size equal to the
// values in the internal registers.
index_hole_limit_ = 6;
printf("Seeking %02x %02x %02x %02x\n", cylinder_, head_, sector_, size_);
index_hole_limit_ = 2;
// printf("Seeking %02x %02x %02x %02x\n", cylinder_, head_, sector_, size_);
find_next_sector:
FIND_HEADER();
if(!index_hole_limit_) {
// Two index holes have passed wihout finding the header sought.
printf("Not found\n");
// printf("Not found\n");
SetNoData();
goto abort_read_write;
goto abort;
}
printf("Header\n");
index_hole_count_ = 0;
// printf("Header\n");
READ_HEADER();
if(index_hole_count_) {
// This implies an index hole was sighted within the header. Error out.
SetEndOfCylinder();
goto abort;
}
if(get_crc_generator().get_value()) {
// This implies a CRC error in the header; mark as such but continue.
SetDataError();
}
printf("Considering %02x %02x %02x %02x [%04x]\n", header_[0], header_[1], header_[2], header_[3], get_crc_generator().get_value());
// printf("Considering %02x %02x %02x %02x [%04x]\n", header_[0], header_[1], header_[2], header_[3], get_crc_generator().get_value());
if(header_[0] != cylinder_ || header_[1] != head_ || header_[2] != sector_ || header_[3] != size_) goto find_next_sector;
// Branch to whatever is supposed to happen next
printf("Proceeding\n");
// printf("Proceeding\n");
switch(command_[0] & 0x1f) {
case CommandReadData:
case CommandReadDeletedData:
@ -383,11 +391,6 @@ void i8272::posit_event(int event_type) {
}
// Sets abnormal termination of the current command and proceeds to an ST0, ST1, ST2, C, H, R, N result phase.
abort_read_write:
SetAbnormalTermination();
goto post_st012chrn;
// Performs the read data or read deleted data command.
read_data:
printf("Read [deleted] data [%02x %02x %02x %02x ... %02x %02x]\n", command_[2], command_[3], command_[4], command_[5], command_[6], command_[8]);
@ -400,14 +403,27 @@ 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] & 0x1f) == CommandReadData)) {
if(!(command_[0]&0x20)) {
// SK is not set; set the error flag but read this sector before finishing.
SetControlMark();
if(event_type == (int)Event::Token) {
if(get_latest_token().type != Token::Data && get_latest_token().type != Token::DeletedData) {
// Something other than a data mark came next — impliedly an ID or index mark.
SetMissingAddressMark();
SetMissingDataAddressMark();
goto abort; // TODO: or read_next_data?
} else {
// SK is set; skip this sector.
goto read_next_data;
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();
} else {
// SK is set; skip this sector.
goto read_next_data;
}
}
}
} else {
// An index hole appeared before the data mark.
SetEndOfCylinder();
goto abort; // TODO: or read_next_data?
}
distance_into_section_ = 0;
@ -418,12 +434,14 @@ void i8272::posit_event(int event_type) {
//
// TODO: consider DTL.
read_data_get_byte:
WAIT_FOR_EVENT(Event::Token);
result_stack_.push_back(get_latest_token().byte_value);
distance_into_section_++;
SetDataRequest();
SetDataDirectionToProcessor();
WAIT_FOR_EVENT((int)Event8272::ResultEmpty | (int)Event::Token | (int)Event::IndexHole);
WAIT_FOR_EVENT((int)Event::Token | (int)Event::IndexHole);
if(event_type == (int)Event::Token) {
result_stack_.push_back(get_latest_token().byte_value);
distance_into_section_++;
SetDataRequest();
SetDataDirectionToProcessor();
WAIT_FOR_EVENT((int)Event8272::ResultEmpty | (int)Event::Token | (int)Event::IndexHole);
}
switch(event_type) {
case (int)Event8272::ResultEmpty: // The caller read the byte in time; proceed as normal.
ResetDataRequest();
@ -431,9 +449,11 @@ void i8272::posit_event(int event_type) {
break;
case (int)Event::Token: // The caller hasn't read the old byte yet and a new one has arrived
SetOverrun();
goto abort_read_write;
goto abort;
break;
case (int)Event::IndexHole:
SetEndOfCylinder();
goto abort;
break;
}
@ -444,7 +464,7 @@ void i8272::posit_event(int event_type) {
// This implies a CRC error in the sector; mark as such and temrinate.
SetDataError();
SetDataFieldDataError();
goto abort_read_write;
goto abort;
}
// check whether that's it: either the final requested sector has been read, or because
@ -462,13 +482,9 @@ void i8272::posit_event(int event_type) {
if(!dma_mode_) SetNonDMAExecution();
SET_DRIVE_HEAD_MFM();
// if(command_[2] == 0x16 && command_[3] == 0x00 && command_[4] == 0x06 && command_[5] == 0x02) {
// printf("?");
// }
if(drives_[active_drive_].drive->get_is_read_only()) {
SetNotWriteable();
goto abort_read_write;
goto abort;
}
write_next_data:
@ -490,7 +506,7 @@ void i8272::posit_event(int event_type) {
if(!has_input_) {
SetOverrun();
end_writing();
goto abort_read_write;
goto abort;
}
write_byte(input_);
has_input_ = false;
@ -527,7 +543,7 @@ void i8272::posit_event(int event_type) {
FIND_HEADER();
if(!index_hole_limit_) {
SetNoData();
goto abort_read_write;
goto abort;
}
READ_HEADER();
@ -557,7 +573,7 @@ void i8272::posit_event(int event_type) {
if(!index_hole_limit_) {
if(!sector_) {
SetMissingAddressMark();
goto abort_read_write;
goto abort;
} else {
goto post_st012chrn;
}
@ -589,7 +605,7 @@ void i8272::posit_event(int event_type) {
SET_DRIVE_HEAD_MFM();
if(drives_[active_drive_].drive->get_is_read_only()) {
SetNotWriteable();
goto abort_read_write;
goto abort;
}
LOAD_HEAD();
@ -619,7 +635,7 @@ void i8272::posit_event(int event_type) {
case (int)Event::IndexHole:
SetOverrun();
end_writing();
goto abort_read_write;
goto abort;
break;
case (int)Event::DataWritten:
header_[distance_into_section_] = input_;
@ -777,6 +793,11 @@ void i8272::posit_event(int event_type) {
result_stack_.push_back(0x80);
goto post_result;
// Sets abnormal termination of the current command and proceeds to an ST0, ST1, ST2, C, H, R, N result phase.
abort:
SetAbnormalTermination();
goto post_st012chrn;
// Posts ST0, ST1, ST2, C, H, R and N as a result phase.
post_st012chrn:
SCHEDULE_HEAD_UNLOAD();