Check for lower capacity media in the floppy drive and set the corresponding controller data rate for it.
Signed-off-by: Kevin O'Connor kevin@koconnor.net --- src/floppy.c | 123 +++++++++++++++++++++++++++++++++++++---------------------- 1 file changed, 78 insertions(+), 45 deletions(-)
diff --git a/src/floppy.c b/src/floppy.c index 91d3565..e335e86 100644 --- a/src/floppy.c +++ b/src/floppy.c @@ -52,29 +52,37 @@ struct floppy_dbt_s diskette_param_table VAR16FIXED(0xefc7);
struct floppyinfo_s { struct chs_s chs; - u8 config_data; - u8 media_state; + u8 floppy_size; + u8 data_rate; };
+#define FLOPPY_SIZE_525 0x01 +#define FLOPPY_SIZE_350 0x02 + +#define FLOPPY_RATE_500K 0x00 +#define FLOPPY_RATE_300K 0x01 +#define FLOPPY_RATE_250K 0x02 +#define FLOPPY_RATE_1M 0x03 + struct floppyinfo_s FloppyInfo[] VARFSEG = { // Unknown { {0, 0, 0}, 0x00, 0x00}, // 1 - 360KB, 5.25" - 2 heads, 40 tracks, 9 sectors - { {2, 40, 9}, 0x00, 0x25}, + { {2, 40, 9}, FLOPPY_SIZE_525, FLOPPY_RATE_300K}, // 2 - 1.2MB, 5.25" - 2 heads, 80 tracks, 15 sectors - { {2, 80, 15}, 0x00, 0x25}, + { {2, 80, 15}, FLOPPY_SIZE_525, FLOPPY_RATE_500K}, // 3 - 720KB, 3.5" - 2 heads, 80 tracks, 9 sectors - { {2, 80, 9}, 0x00, 0x17}, + { {2, 80, 9}, FLOPPY_SIZE_350, FLOPPY_RATE_250K}, // 4 - 1.44MB, 3.5" - 2 heads, 80 tracks, 18 sectors - { {2, 80, 18}, 0x00, 0x17}, + { {2, 80, 18}, FLOPPY_SIZE_350, FLOPPY_RATE_500K}, // 5 - 2.88MB, 3.5" - 2 heads, 80 tracks, 36 sectors - { {2, 80, 36}, 0xCC, 0xD7}, + { {2, 80, 36}, FLOPPY_SIZE_350, FLOPPY_RATE_1M}, // 6 - 160k, 5.25" - 1 heads, 40 tracks, 8 sectors - { {1, 40, 8}, 0x00, 0x27}, + { {1, 40, 8}, FLOPPY_SIZE_525, FLOPPY_RATE_250K}, // 7 - 180k, 5.25" - 1 heads, 40 tracks, 9 sectors - { {1, 40, 9}, 0x00, 0x27}, + { {1, 40, 9}, FLOPPY_SIZE_525, FLOPPY_RATE_300K}, // 8 - 320k, 5.25" - 2 heads, 40 tracks, 8 sectors - { {2, 40, 8}, 0x00, 0x27}, + { {2, 40, 8}, FLOPPY_SIZE_525, FLOPPY_RATE_250K}, };
struct drive_s * @@ -335,44 +343,69 @@ floppy_drive_recal(u8 floppyid) }
static int +floppy_drive_readid(u8 floppyid, u8 data_rate, u8 head) +{ + int ret = floppy_select_drive(floppyid); + if (ret) + return ret; + + // Set data rate. + outb(data_rate, PORT_FD_DIR); + + // send Read Sector Id command + struct floppy_pio_s pio; + pio.cmdlen = 2; + pio.resplen = 7; + pio.waitirq = 1; + pio.data[0] = 0x4a; // 0a: Read Sector Id + pio.data[1] = (head << 2) | floppyid; // HD DR1 DR2 + ret = floppy_pio(&pio); + if (ret) + return ret; + if (pio.data[0] & 0xc0) + return -1; + return 0; +} + +static int floppy_media_sense(struct drive_s *drive_g) { - // for now cheat and get drive type from CMOS, - // assume media is same as drive type - - // ** config_data ** - // Bitfields for diskette media control: - // Bit(s) Description (Table M0028) - // 7-6 last data rate set by controller - // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps - // 5-4 last diskette drive step rate selected - // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah - // 3-2 {data rate at start of operation} - // 1-0 reserved - - // ** media_state ** - // Bitfields for diskette drive media state: - // Bit(s) Description (Table M0030) - // 7-6 data rate - // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps - // 5 double stepping required (e.g. 360kB in 1.2MB) - // 4 media type established - // 3 drive capable of supporting 4MB media - // 2-0 on exit from BIOS, contains - // 000 trying 360kB in 360kB - // 001 trying 360kB in 1.2MB - // 010 trying 1.2MB in 1.2MB - // 011 360kB in 360kB established - // 100 360kB in 1.2MB established - // 101 1.2MB in 1.2MB established - // 110 reserved - // 111 all other formats/drives - - u8 ftype = GET_GLOBAL(drive_g->floppy_type); - SET_BDA(floppy_last_data_rate, GET_GLOBAL(FloppyInfo[ftype].config_data)); + u8 ftype = GET_GLOBAL(drive_g->floppy_type), stype = ftype; u8 floppyid = GET_GLOBAL(drive_g->cntl_id); - SET_BDA(floppy_media_state[floppyid] - , GET_GLOBAL(FloppyInfo[ftype].media_state)); + + u8 data_rate = GET_GLOBAL(FloppyInfo[stype].data_rate); + int ret = floppy_drive_readid(floppyid, data_rate, 0); + if (ret) { + // Attempt media sense. + for (stype=1; ; stype++) { + if (stype >= ARRAY_SIZE(FloppyInfo)) + return DISK_RET_EMEDIA; + if (stype==ftype + || (GET_GLOBAL(FloppyInfo[stype].floppy_size) + != GET_GLOBAL(FloppyInfo[ftype].floppy_size)) + || (GET_GLOBAL(FloppyInfo[stype].chs.heads) + > GET_GLOBAL(FloppyInfo[ftype].chs.heads)) + || (GET_GLOBAL(FloppyInfo[stype].chs.cylinders) + > GET_GLOBAL(FloppyInfo[ftype].chs.cylinders)) + || (GET_GLOBAL(FloppyInfo[stype].chs.spt) + > GET_GLOBAL(FloppyInfo[ftype].chs.spt))) + continue; + data_rate = GET_GLOBAL(FloppyInfo[stype].data_rate); + ret = floppy_drive_readid(floppyid, data_rate, 0); + if (!ret) + break; + } + } + + u8 old_data_rate = GET_BDA(floppy_media_state[floppyid]) >> 6; + SET_BDA(floppy_last_data_rate, (old_data_rate<<2) | (data_rate<<6)); + u8 media = (stype == 1 ? 0x04 : (stype == 2 ? 0x05 : 0x07)); + u8 fms = (data_rate<<6) | FMS_MEDIA_DRIVE_ESTABLISHED | media; + if (GET_GLOBAL(FloppyInfo[stype].chs.cylinders) + < GET_GLOBAL(FloppyInfo[ftype].chs.cylinders)) + fms |= FMS_DOUBLE_STEPPING; + SET_BDA(floppy_media_state[floppyid], fms); + return DISK_RET_SUCCESS; }