[SeaBIOS] [PATCH 7/8] floppy: Implement media format sensing.
Kevin O'Connor
kevin at koconnor.net
Sun Mar 3 21:43:18 CET 2013
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 at 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;
}
--
1.7.11.7
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