diff options
Diffstat (limited to 'src/tools/imgtool/formats/pc_dsk_legacy.cpp')
-rw-r--r-- | src/tools/imgtool/formats/pc_dsk_legacy.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/tools/imgtool/formats/pc_dsk_legacy.cpp b/src/tools/imgtool/formats/pc_dsk_legacy.cpp new file mode 100644 index 00000000000..771f0de8638 --- /dev/null +++ b/src/tools/imgtool/formats/pc_dsk_legacy.cpp @@ -0,0 +1,140 @@ +// license:BSD-3-Clause +// copyright-holders:Nathan Woods +/********************************************************************* + + formats/pc_dsk_legacy.cpp + + PC disk images (legacy support for imgtool) + +*********************************************************************/ + +#include "formats/pc_dsk_legacy.h" +#include "formats/basicdsk.h" + +#include "opresolv.h" + +struct pc_disk_sizes +{ + uint32_t image_size; + int sectors; + int heads; +}; + + + +static const struct pc_disk_sizes disk_sizes[] = +{ + { 8*1*40*512, 8, 1}, /* 5 1/4 inch double density single sided */ + { 8*2*40*512, 8, 2}, /* 5 1/4 inch double density */ + { 9*1*40*512, 9, 1}, /* 5 1/4 inch double density single sided */ + { 9*2*40*512, 9, 2}, /* 5 1/4 inch double density */ + {10*2*40*512, 10, 2}, /* 5 1/4 inch double density single sided */ + { 9*2*80*512, 9, 2}, /* 80 tracks 5 1/4 inch drives rare in PCs */ + { 9*2*80*512, 9, 2}, /* 3 1/2 inch double density */ + {15*2*80*512, 15, 2}, /* 5 1/4 inch high density (or japanese 3 1/2 inch high density) */ + {18*2*80*512, 18, 2}, /* 3 1/2 inch high density */ + {21*2*80*512, 21, 2}, /* 3 1/2 inch high density DMF */ + {36*2*80*512, 36, 2} /* 3 1/2 inch enhanced density */ +}; + + + +static floperr_t pc_dsk_compute_geometry(floppy_image_legacy *floppy, struct basicdsk_geometry *geometry) +{ + int i; + uint64_t size; + + memset(geometry, 0, sizeof(*geometry)); + size = floppy_image_size(floppy); + + for (i = 0; i < std::size(disk_sizes); i++) + { + if (disk_sizes[i].image_size == size) + { + geometry->sectors = disk_sizes[i].sectors; + geometry->heads = disk_sizes[i].heads; + geometry->sector_length = 512; + geometry->first_sector_id = 1; + geometry->tracks = (int) (size / disk_sizes[i].sectors / disk_sizes[i].heads / geometry->sector_length); + return FLOPPY_ERROR_SUCCESS; + } + } + + if (size >= 0x1a) + { + /* + * get info from boot sector. + * not correct on all disks + */ + uint8_t scl, spt, heads; + floppy_image_read(floppy, &scl, 0x0c, 1); + floppy_image_read(floppy, &spt, 0x18, 1); + floppy_image_read(floppy, &heads, 0x1A, 1); + + if (size == ((uint64_t) scl) * spt * heads * 0x200) + { + geometry->sectors = spt; + geometry->heads = heads; + geometry->sector_length = 512; + geometry->first_sector_id = 1; + geometry->tracks = scl; + return FLOPPY_ERROR_SUCCESS; + } + } + + return FLOPPY_ERROR_SUCCESS; +} + + + +static FLOPPY_IDENTIFY(pc_dsk_identify) +{ + floperr_t err; + struct basicdsk_geometry geometry; + + err = pc_dsk_compute_geometry(floppy, &geometry); + if (err) + return err; + + *vote = geometry.heads ? 100 : 0; + return FLOPPY_ERROR_SUCCESS; +} + + + +static FLOPPY_CONSTRUCT(pc_dsk_construct) +{ + floperr_t err; + struct basicdsk_geometry geometry; + + if (params) + { + /* create */ + memset(&geometry, 0, sizeof(geometry)); + geometry.heads = params->lookup_int(PARAM_HEADS); + geometry.tracks = params->lookup_int(PARAM_TRACKS); + geometry.sectors = params->lookup_int(PARAM_SECTORS); + geometry.first_sector_id = 1; + geometry.sector_length = 512; + } + else + { + /* open */ + err = pc_dsk_compute_geometry(floppy, &geometry); + if (err) + return err; + } + + return basicdsk_construct(floppy, &geometry); +} + + + +/* ----------------------------------------------------------------------- */ + +LEGACY_FLOPPY_OPTIONS_START( pc ) + LEGACY_FLOPPY_OPTION( pc_dsk, "dsk,ima,img,ufi,360", "PC floppy disk image", pc_dsk_identify, pc_dsk_construct, nullptr, + HEADS([1]-2) + TRACKS(40/[80]) + SECTORS(8/[9]/10/15/18/36)) +LEGACY_FLOPPY_OPTIONS_END |