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fdc: add physical disk sizes 

2.88MB capable drives can accept 1.44MB floppies,
for instance. To rework the pick_geometry function,
we need to know if our current drive can even accept
the type of disks we're considering.

NB: This allows us to distinguish between all of the
"total sectors" collisions between 1.20MB and 1.44MB
diskette types, by using the physical drive size as a
differentiator.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1453495865-9649-10-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2016-01-22 15:51:02 -05:00
parent fff4687b9e
commit 109c17bc20
1 changed files with 32 additions and 8 deletions
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40
hw/block/fdc.c
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@ -60,6 +60,12 @@ typedef enum FDriveRate {
FDRIVE_RATE_1M = 0x03, /* 1 Mbps */
} FDriveRate;
typedef enum FDriveSize {
FDRIVE_SIZE_UNKNOWN,
FDRIVE_SIZE_350,
FDRIVE_SIZE_525,
} FDriveSize;
typedef struct FDFormat {
FloppyDriveType drive;
uint8_t last_sect;
@ -68,11 +74,15 @@ typedef struct FDFormat {
FDriveRate rate;
} FDFormat;
/* In many cases, the total sector size of a format is enough to uniquely
* identify it. However, there are some total sector collisions between
* formats of different physical size, and these are noted below by
* highlighting the total sector size for entries with collisions. */
static const FDFormat fd_formats[] = {
/* First entry is default format */
/* 1.44 MB 3"1/2 floppy disks */
{ FLOPPY_DRIVE_TYPE_144, 18, 80, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_144, 20, 80, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_144, 18, 80, 1, FDRIVE_RATE_500K, }, /* 3.5" 2880 */
{ FLOPPY_DRIVE_TYPE_144, 20, 80, 1, FDRIVE_RATE_500K, }, /* 3.5" 3200 */
{ FLOPPY_DRIVE_TYPE_144, 21, 80, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_144, 21, 82, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_144, 21, 83, 1, FDRIVE_RATE_500K, },
@ -86,7 +96,7 @@ static const FDFormat fd_formats[] = {
{ FLOPPY_DRIVE_TYPE_288, 44, 80, 1, FDRIVE_RATE_1M, },
{ FLOPPY_DRIVE_TYPE_288, 48, 80, 1, FDRIVE_RATE_1M, },
/* 720 kB 3"1/2 floppy disks */
{ FLOPPY_DRIVE_TYPE_144, 9, 80, 1, FDRIVE_RATE_250K, },
{ FLOPPY_DRIVE_TYPE_144, 9, 80, 1, FDRIVE_RATE_250K, }, /* 3.5" 1440 */
{ FLOPPY_DRIVE_TYPE_144, 10, 80, 1, FDRIVE_RATE_250K, },
{ FLOPPY_DRIVE_TYPE_144, 10, 82, 1, FDRIVE_RATE_250K, },
{ FLOPPY_DRIVE_TYPE_144, 10, 83, 1, FDRIVE_RATE_250K, },
@ -94,15 +104,15 @@ static const FDFormat fd_formats[] = {
{ FLOPPY_DRIVE_TYPE_144, 14, 80, 1, FDRIVE_RATE_250K, },
/* 1.2 MB 5"1/4 floppy disks */
{ FLOPPY_DRIVE_TYPE_120, 15, 80, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_120, 18, 80, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_120, 18, 80, 1, FDRIVE_RATE_500K, }, /* 5.25" 2880 */
{ FLOPPY_DRIVE_TYPE_120, 18, 82, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_120, 18, 83, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_120, 20, 80, 1, FDRIVE_RATE_500K, },
{ FLOPPY_DRIVE_TYPE_120, 20, 80, 1, FDRIVE_RATE_500K, }, /* 5.25" 3200 */
/* 720 kB 5"1/4 floppy disks */
{ FLOPPY_DRIVE_TYPE_120, 9, 80, 1, FDRIVE_RATE_250K, },
{ FLOPPY_DRIVE_TYPE_120, 9, 80, 1, FDRIVE_RATE_250K, }, /* 5.25" 1440 */
{ FLOPPY_DRIVE_TYPE_120, 11, 80, 1, FDRIVE_RATE_250K, },
/* 360 kB 5"1/4 floppy disks */
{ FLOPPY_DRIVE_TYPE_120, 9, 40, 1, FDRIVE_RATE_300K, },
{ FLOPPY_DRIVE_TYPE_120, 9, 40, 1, FDRIVE_RATE_300K, }, /* 5.25" 720 */
{ FLOPPY_DRIVE_TYPE_120, 9, 40, 0, FDRIVE_RATE_300K, },
{ FLOPPY_DRIVE_TYPE_120, 10, 41, 1, FDRIVE_RATE_300K, },
{ FLOPPY_DRIVE_TYPE_120, 10, 42, 1, FDRIVE_RATE_300K, },
@ -110,11 +120,25 @@ static const FDFormat fd_formats[] = {
{ FLOPPY_DRIVE_TYPE_120, 8, 40, 1, FDRIVE_RATE_250K, },
{ FLOPPY_DRIVE_TYPE_120, 8, 40, 0, FDRIVE_RATE_250K, },
/* 360 kB must match 5"1/4 better than 3"1/2... */
{ FLOPPY_DRIVE_TYPE_144, 9, 80, 0, FDRIVE_RATE_250K, },
{ FLOPPY_DRIVE_TYPE_144, 9, 80, 0, FDRIVE_RATE_250K, }, /* 3.5" 720 */
/* end */
{ FLOPPY_DRIVE_TYPE_NONE, -1, -1, 0, 0, },
};
__attribute__((__unused__))
static FDriveSize drive_size(FloppyDriveType drive)
{
switch (drive) {
case FLOPPY_DRIVE_TYPE_120:
return FDRIVE_SIZE_525;
case FLOPPY_DRIVE_TYPE_144:
case FLOPPY_DRIVE_TYPE_288:
return FDRIVE_SIZE_350;
default:
return FDRIVE_SIZE_UNKNOWN;
}
}
#define GET_CUR_DRV(fdctrl) ((fdctrl)->cur_drv)
#define SET_CUR_DRV(fdctrl, drive) ((fdctrl)->cur_drv = (drive))