// 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