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Merge branch 'master' into micropolis-write

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Let's not act like this actually compiles.
This commit is contained in:
Eric Anderson
2021-10-02 12:45:56 -07:00
parent 8b71c0d737 336cc0077c
commit c54de27503
535 changed files with 94284 additions and 12092 deletions
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74
arch/micropolis/decoder.cc
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@@ -10,18 +10,6 @@
/* The sector has a preamble of MFM 0x00s and uses 0xFF as a sync pattern. */
static const FluxPattern SECTOR_SYNC_PATTERN(32, 0xaaaa5555);
AbstractDecoder::RecordType MicropolisDecoder::advanceToNextRecord()
{
_fmr->seekToIndexMark();
const FluxMatcher* matcher = nullptr;
_sector->clock = _fmr->seekToPattern(SECTOR_SYNC_PATTERN, matcher);
if (matcher == &SECTOR_SYNC_PATTERN) {
readRawBits(16);
return SECTOR_RECORD;
}
return UNKNOWN_RECORD;
}
/* Adds all bytes, with carry. */
uint8_t micropolisChecksum(const Bytes& bytes) {
ByteReader br(bytes);
@@ -36,26 +24,52 @@ uint8_t micropolisChecksum(const Bytes& bytes) {
return sum & 0xFF;
}
void MicropolisDecoder::decodeSectorRecord()
class MicropolisDecoder : public AbstractDecoder
{
auto rawbits = readRawBits(MICROPOLIS_ENCODED_SECTOR_SIZE*16);
auto bytes = decodeFmMfm(rawbits).slice(0, MICROPOLIS_ENCODED_SECTOR_SIZE);
ByteReader br(bytes);
public:
MicropolisDecoder(const DecoderProto& config):
AbstractDecoder(config)
{}
br.read_8(); /* sync */
_sector->logicalTrack = br.read_8();
_sector->logicalSide = _sector->physicalSide;
_sector->logicalSector = br.read_8();
if (_sector->logicalSector > 15)
return;
if (_sector->logicalTrack > 77)
return;
RecordType advanceToNextRecord()
{
_fmr->seekToIndexMark();
const FluxMatcher* matcher = nullptr;
_sector->clock = _fmr->seekToPattern(SECTOR_SYNC_PATTERN, matcher);
if (matcher == &SECTOR_SYNC_PATTERN) {
readRawBits(16);
return SECTOR_RECORD;
}
return UNKNOWN_RECORD;
}
br.read(10); /* OS data or padding */
_sector->data = br.read(256);
uint8_t wantChecksum = br.read_8();
uint8_t gotChecksum = micropolisChecksum(bytes.slice(1, 2+266));
br.read(5); /* 4 byte ECC and ECC-present flag */
void decodeSectorRecord()
{
auto rawbits = readRawBits(MICROPOLIS_ENCODED_SECTOR_SIZE*16);
auto bytes = decodeFmMfm(rawbits).slice(0, MICROPOLIS_ENCODED_SECTOR_SIZE);
ByteReader br(bytes);
_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
br.read_8(); /* sync */
_sector->logicalTrack = br.read_8();
_sector->logicalSide = _sector->physicalHead;
_sector->logicalSector = br.read_8();
if (_sector->logicalSector > 15)
return;
if (_sector->logicalTrack > 77)
return;
br.read(10); /* OS data or padding */
_sector->data = br.read(256);
uint8_t wantChecksum = br.read_8();
uint8_t gotChecksum = micropolisChecksum(bytes.slice(1, 2+266));
br.read(5); /* 4 byte ECC and ECC-present flag */
_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
}
};
std::unique_ptr<AbstractDecoder> createMicropolisDecoder(const DecoderProto& config)
{
return std::unique_ptr<AbstractDecoder>(new MicropolisDecoder(config));
}