Function do_process_rw_command

src/ide.cpp:976–1055

}

static void do_process_rw_command (struct ide_hdf *ide)
{
	unsigned int cyl, head, sec, nsec, nsec_total;
	uae_u64 lba;
	bool last = true;

	ide->data_offset = 0;

	if (ide->direction > 1) {
		// FORMAT TRACK?
		// Don't write anything
		goto end;
	}

	nsec = get_nsec (ide);
	get_lbachs (ide, &lba, &cyl, &head, &sec);
	if (IDE_LOG > 1)
		write_log(_T("IDE%d off=%d, nsec=%d (%d) %s\n"), ide->num, (uae_u32)lba, nsec, ide->multiple_mode, getidemode(ide));
	if (nsec > ide->max_lba - lba) {
		nsec = (unsigned int)(ide->max_lba - lba);
		if (IDE_LOG > 1)
			write_log (_T("IDE%d nsec changed to %d\n"), ide->num, nsec);
	}
	if (nsec <= 0) {
		ide_data_ready (ide);
		ide_fail_err (ide, IDE_ERR_IDNF);
		return;
	}
	nsec_total = nsec;
	ide_grow_buffer(ide, nsec_total * ide->blocksize);

	if (nsec > ide->data_multi)
		nsec = ide->data_multi;

	if (ide->buffer_offset == 0) {
		// store initial lba and number of sectors to transfer
		ide->start_lba = lba;
		ide->start_nsec = nsec_total;
	}

	if (ide->direction) {
		if (IDE_LOG > 1)
			write_log (_T("IDE%d write, %d/%d bytes, buffer offset %d\n"), ide->num, nsec * ide->blocksize, nsec_total * ide->blocksize, ide->buffer_offset);
	} else {
		if (ide->buffer_offset == 0) {
			hdf_read(&ide->hdhfd.hfd, ide->secbuf, ide->start_lba * ide->blocksize, ide->start_nsec * ide->blocksize);
			if (IDE_LOG > 1)
				write_log(_T("IDE%d initial read, %d bytes\n"), ide->num, nsec_total * ide->blocksize);
		}
		if (IDE_LOG > 1)
			write_log (_T("IDE%d read, read %d/%d bytes, buffer offset=%d\n"), ide->num, nsec * ide->blocksize, nsec_total * ide->blocksize, ide->buffer_offset);
	}
	ide->intdrq = true;
	last = dec_nsec (ide, nsec) == 0;
	// ATA-2 spec says CHS/LBA does only need to be updated if error condition
	if (ide->ata_level != 2 || !last) {
		put_lbachs (ide, lba, cyl, head, sec, last ? nsec - 1 : nsec);
	}