From e08fde0c5ee4e7f3ec319a44b846fb9e127c1db2 Mon Sep 17 00:00:00 2001 From: Roman Kagan Date: Wed, 17 Feb 2016 21:25:32 +0300 Subject: fdc: add function to determine drive chs limits When populating ACPI objects for floppy drives one needs to provide the maximum values for cylinder, sector, and head number the drive supports. This patch adds a function that iterates through the array of predefined floppy drive formats and returns the maximum values of c, h, s, out of those matching the given floppy drive type. Signed-off-by: Roman Kagan Cc: Igor Mammedov Cc: "Michael S. Tsirkin" Cc: Marcel Apfelbaum Cc: John Snow Cc: Laszlo Ersek Cc: Kevin O'Connor Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: John Snow --- hw/block/fdc.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'hw/block') diff --git a/hw/block/fdc.c b/hw/block/fdc.c index 9838d21cf5..fc3aef9cd1 100644 --- a/hw/block/fdc.c +++ b/hw/block/fdc.c @@ -2557,6 +2557,29 @@ FloppyDriveType isa_fdc_get_drive_type(ISADevice *fdc, int i) return isa->state.drives[i].drive; } +void isa_fdc_get_drive_max_chs(FloppyDriveType type, + uint8_t *maxc, uint8_t *maxh, uint8_t *maxs) +{ + const FDFormat *fdf; + + *maxc = *maxh = *maxs = 0; + for (fdf = fd_formats; fdf->drive != FLOPPY_DRIVE_TYPE_NONE; fdf++) { + if (fdf->drive != type) { + continue; + } + if (*maxc < fdf->max_track) { + *maxc = fdf->max_track; + } + if (*maxh < fdf->max_head) { + *maxh = fdf->max_head; + } + if (*maxs < fdf->last_sect) { + *maxs = fdf->last_sect; + } + } + (*maxc)--; +} + static const VMStateDescription vmstate_isa_fdc ={ .name = "fdc", .version_id = 2, -- cgit v1.2.3