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Renamed result_ to result_stack_ to emphasis the fact that it goes backwards. Switched meaning of CB so that it is set for the entire command, execution and result phases.

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This commit is contained in:
Thomas Harte 2017-08-06 20:17:12 -04:00
parent 01efb645cb
commit 3b7ecbdf0d
2 changed files with 24 additions and 25 deletions
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47
Components/8272/i8272.cpp
View File

@ -84,10 +84,12 @@ void i8272::set_register(int address, uint8_t value) {
uint8_t i8272::get_register(int address) {
if(address) {
printf("8272 get data\n");
if(result_.empty()) return 0xff;
uint8_t result = result_.back();
result_.pop_back();
if(result_.empty()) posit_event((int)Event8272::ResultEmpty);
if(result_stack_.empty()) return 0xff;
uint8_t result = result_stack_.back();
result_stack_.pop_back();
if(result_stack_.empty()) posit_event((int)Event8272::ResultEmpty);
return result;
} else {
// printf("8272 get main status\n");
@ -142,6 +144,7 @@ void i8272::posit_event(int event_type) {
wait_for_complete_command_sequence:
main_status_ |= StatusRQM;
WAIT_FOR_EVENT(Event8272::CommandByte)
main_status_ |= StatusCB;
main_status_ &= ~StatusRQM;
switch(command_[0] & 0x1f) {
@ -210,7 +213,6 @@ void i8272::posit_event(int event_type) {
read_data:
printf("Read data, sector %02x %02x %02x %02x\n", command_[2], command_[3], command_[4], command_[5]);
main_status_ |= StatusCB;
if(!dma_mode_) main_status_ |= StatusNDM;
set_drive(drives_[command_[1]&3].drive);
set_is_double_density(command_[0] & 0x40);
@ -224,7 +226,7 @@ void i8272::posit_event(int event_type) {
FIND_HEADER();
if(!index_hole_limit_) goto read_data_not_found;
READ_HEADER();
printf("Comparing with %02x\n", sector_);
printf("Comparing with %02x\n", header_[2]);
if(header_[2] != sector_) goto find_next_sector;
printf("Unimplemented!!\n");
@ -234,21 +236,17 @@ void i8272::posit_event(int event_type) {
printf("Not found\n");
status_[1] |= 0x4;
status_[0] = (status_[0] & ~0xc0) | 0x40;
status_[0] = 0x40; // (status_[0] & ~0xc0) |
read_data_end:
// result_.push_back(header_[3]);
// result_.push_back(header_[2]);
// result_.push_back(header_[1]);
// result_.push_back(header_[0]);
result_.push_back(size_);
result_.push_back(sector_);
result_.push_back(head_);
result_.push_back(cylinder_);
result_stack_.push_back(command_[5]);
result_stack_.push_back(command_[4]);
result_stack_.push_back(command_[3]);
result_stack_.push_back(command_[2]);
result_.push_back(status_[2]);
result_.push_back(status_[1]);
result_.push_back(status_[0]);
result_stack_.push_back(status_[2]);
result_stack_.push_back(status_[1]);
result_stack_.push_back(status_[0]);
goto post_result;
@ -311,11 +309,12 @@ void i8272::posit_event(int event_type) {
}
if(found_drive != -1) {
drives_[found_drive].phase = Drive::NotSeeking;
result_.push_back(drives_[found_drive].head_position);
status_[0] = (uint8_t)found_drive | 0x20;
result_.push_back(status_[0]);
result_stack_.push_back(drives_[found_drive].head_position);
result_stack_.push_back(status_[0]);
} else {
result_.push_back(0x80);
result_stack_.push_back(0x80);
}
}
goto post_result;
@ -330,7 +329,7 @@ void i8272::posit_event(int event_type) {
sense_drive_status:
printf("Sense drive status\n");
result_.push_back(status_[3]);
result_stack_.push_back(status_[3]);
goto post_result;
seek:
@ -347,9 +346,9 @@ void i8272::posit_event(int event_type) {
goto wait_for_command;
post_result:
// Set ready to send data to the processor, no longer in [non-DMA] execution phase.
// Set ready to send data to the processor, no longer in non-DMA execution phase.
main_status_ |= StatusRQM | StatusDIO;
main_status_ &= ~(StatusNDM | StatusCB);
main_status_ &= ~StatusNDM;
WAIT_FOR_EVENT(Event8272::ResultEmpty);
main_status_ &= ~StatusDIO;

2
Components/8272/i8272.hpp
View File

@ -34,7 +34,7 @@ class i8272: public Storage::Disk::MFMController {
uint8_t status_[4];
std::vector<uint8_t> command_;
std::vector<uint8_t> result_;
std::vector<uint8_t> result_stack_;
enum class Event8272: int {
CommandByte = (1 << 3),