mirror of
https://github.com/dingusdev/dingusppc.git
synced 2024-09-27 19:54:46 +00:00
Initial support for floppy disk images.
This commit is contained in:
parent
decb8342be
commit
f39188beb1
@ -9,6 +9,7 @@ file(GLOB SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/*.cpp"
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"${CMAKE_CURRENT_SOURCE_DIR}/common/pci/*.cpp"
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"${CMAKE_CURRENT_SOURCE_DIR}/common/scsi/*.cpp"
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"${CMAKE_CURRENT_SOURCE_DIR}/ethernet/*.cpp"
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"${CMAKE_CURRENT_SOURCE_DIR}/floppy/*.cpp"
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"${CMAKE_CURRENT_SOURCE_DIR}/ioctrl/*.cpp"
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"${CMAKE_CURRENT_SOURCE_DIR}/memctrl/*.cpp"
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"${CMAKE_CURRENT_SOURCE_DIR}/serial/*.cpp"
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208
devices/floppy/floppyimg.cpp
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208
devices/floppy/floppyimg.cpp
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@ -0,0 +1,208 @@
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/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-21 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Support for reading and writing of various floppy images. */
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#include "floppyimg.h"
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#include <loguru.hpp>
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#include <memaccess.h>
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#include <cinttypes>
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#include <stdio.h>
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#include <string>
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#include <sys/stat.h>
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static FlopImgType identify_image(FILE *img_file)
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{
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// WOZ images identification strings
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static uint8_t WOZ1_SIG[] = {0x57, 0x4F, 0x5A, 0x31, 0xFF, 0x0A, 0x0D, 0x0A};
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static uint8_t WOZ2_SIG[] = {0x57, 0x4F, 0x5A, 0x32, 0xFF, 0x0A, 0x0D, 0x0A};
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uint8_t buf[8] = { 0 };
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fseek(img_file, 0, SEEK_SET);
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fread(buf, sizeof(buf), 1, img_file);
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// WOZ files are easily identified
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if (!std::memcmp(buf, WOZ1_SIG, sizeof(buf))) {
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return FlopImgType::WOZ1;
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} else if (!std::memcmp(buf, WOZ2_SIG, sizeof(buf))) {
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return FlopImgType::WOZ2;
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} else {
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for (int offset = 0; offset <=84; offset += 84) {
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// rewind to logical block 2
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fseek(img_file, 2*BLOCK_SIZE + offset, SEEK_SET);
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fread(buf, sizeof(buf), 1, img_file);
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// check for HFS/MFS signature at the start of the logical block 2
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if ((buf[0] == 0x42 && buf[1] == 0x44) ||
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(buf[0] == 0xD2 && buf[1] == 0xD7)) {
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if (offset) {
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return FlopImgType::DC42;
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} else {
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return FlopImgType::RAW;
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}
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}
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}
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}
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return FlopImgType::UNKNOWN;
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}
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static int64_t get_img_file_size(const char *fname)
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{
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struct stat stat_buf;
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memset(&stat_buf, 0, sizeof(stat_buf));
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int res = stat(fname, &stat_buf);
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return res == 0 ? stat_buf.st_size : -1;
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}
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static int64_t get_hfs_vol_size(const uint8_t *mdb_data)
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{
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uint16_t drNmAlBlks = READ_WORD_BE_A(&mdb_data[18]);
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uint32_t drAlBlkSiz = READ_DWORD_BE_A(&mdb_data[20]);
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// calculate size of the volume bitmap
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uint32_t vol_bmp_size = (((drNmAlBlks + 8) >> 3) + 512) & 0xFFFFFE00UL;
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return (drNmAlBlks * drAlBlkSiz + vol_bmp_size + 3*BLOCK_SIZE);
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}
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//======================= RAW IMAGE CONVERTER ============================
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RawFloppyImg::RawFloppyImg(const char *file_path) : FloppyImgConverter()
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{
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this->img_path = file_path;
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}
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/** For raw images, we're going to ensure that the data fits into
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one of the supported floppy disk sizes as well as image size
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matches the size of the embedded HFS/MFS volume.
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*/
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int RawFloppyImg::validate()
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{
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FILE *img_file = fopen(this->img_path, "rb");
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if (img_file == NULL) {
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LOG_F(ERROR, "RawFloppyImg: Could not open specified floppy image!");
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return -1;
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}
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// determine image size
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this->img_size = get_img_file_size(this->img_path);
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if (this->img_size < 5*BLOCK_SIZE) {
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LOG_F(ERROR, "RawFloppyImg: image too short!");
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return -1;
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}
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if (this->img_size > MFM_HD_SIZE) {
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LOG_F(ERROR, "RawFloppyImg: image too big!");
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return -1;
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}
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// read Master Directory Block from logical block 2
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uint8_t buf[512] = { 0 };
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fseek(img_file, 2*BLOCK_SIZE, SEEK_SET);
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fread(buf, sizeof(buf), 1, img_file);
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fclose(img_file);
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uint64_t vol_size = 0;
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if (buf[0] == 0x42 && buf[1] == 0x44) {
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// check HFS volume size
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vol_size = get_hfs_vol_size(buf);
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} else if (buf[0] == 0xD2 && buf[1] == 0xD7) {
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// check MFS volume size
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} else {
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LOG_F(ERROR, "RawFloppyImg: unknown volume type!");
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return -1;
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}
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if (vol_size > this->img_size) {
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LOG_F(INFO, "RawFloppyImg: volume size > image size!");
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LOG_F(INFO, "Volume size: %llu, Image size: %llu", vol_size, this->img_size);
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return -1;
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}
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return 0;
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}
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/** Guess physical parameters of the target virtual disk based on image size. */
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int RawFloppyImg::get_phys_params()
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{
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// disk format: GCR vs MFM
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// single-sided vs double-sided
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// number of tracks
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// number of sectors
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return 0;
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}
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/** Convert high-level image data to low-level disk data. */
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int RawFloppyImg::import_data()
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{
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return 0;
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}
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/** Convert low-level disk data to high-level image data. */
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int RawFloppyImg::export_data()
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{
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return 0;
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}
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int open_floppy_image(const char* img_path)
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{
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FloppyImgConverter *fconv;
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FILE *img_file = fopen(img_path, "rb");
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if (img_file == NULL) {
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LOG_F(ERROR, "Could not open specified floppy image!");
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return -1;
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}
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FlopImgType itype = identify_image(img_file);
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fclose(img_file);
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switch(itype) {
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case FlopImgType::RAW:
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LOG_F(INFO, "Raw floppy image");
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fconv = new RawFloppyImg(img_path);
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break;
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case FlopImgType::DC42:
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LOG_F(INFO, "Disk Copy 4.2 image");
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break;
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case FlopImgType::WOZ1:
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case FlopImgType::WOZ2:
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LOG_F(INFO, "WOZ v%s image\n", (itype == FlopImgType::WOZ2) ? "2" : "1");
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break;
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default:
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LOG_F(ERROR, "Unknown/unsupported image format!");
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return -1;
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}
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if (fconv->validate()) {
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LOG_F(ERROR, "Image validation failed!");
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return -1;
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}
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return 0;
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}
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72
devices/floppy/floppyimg.h
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72
devices/floppy/floppyimg.h
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@ -0,0 +1,72 @@
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/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-21 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Definitions for working with various floppy images. */
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#ifndef FLOPPY_IMG_H
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#define FLOPPY_IMG_H
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#include <stdio.h>
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#define BLOCK_SIZE 512 // size in bytes of a logical block
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#define MFM_HD_SIZE (BLOCK_SIZE*2880) // maximal size of a high-density floppy
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/** Floppy image types. */
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enum class FlopImgType {
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RAW, // raw image without metadata or low-level formatting
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DC42, // Disk Copy 4.2 image
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WOZ1, // WOZ v1 image with metadata and low-level data retained
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WOZ2, // WOZ v2 image with metadata and low-level data retained
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UNKNOWN, // invalid/unknown image format
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};
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/** Interface for floppy image converters. */
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class FloppyImgConverter {
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public:
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FloppyImgConverter() = default;
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~FloppyImgConverter() = default;
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virtual int validate(void) = 0;
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virtual int get_phys_params(void) = 0;
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virtual int import_data(void) = 0;
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virtual int export_data(void) = 0;
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};
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/** Converter for raw floppy images. */
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class RawFloppyImg : public FloppyImgConverter {
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public:
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RawFloppyImg(const char *file_path);
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~RawFloppyImg() = default;
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int validate(void);
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int get_phys_params(void);
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int import_data(void);
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int export_data(void);
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private:
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const char *img_path;
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int64_t img_size;
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};
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extern int open_floppy_image(const char* img_path);
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#endif // FLOPPY_IMG_H
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new IntProperty( 0, vector<uint32_t>({0, 8, 16, 32, 64, 128, 256}))},
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{"gfxmem_size",
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new IntProperty( 2, vector<uint32_t>({2, 4, 6}))},
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{"fdd_img",
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new StrProperty("")},
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};
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static const PropMap PDMSettings = {
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@ -83,6 +85,8 @@ static const PropMap PDMSettings = {
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new IntProperty(0, vector<uint32_t>({0, 8, 16, 32, 64, 128}))},
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{"rambank2_size",
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new IntProperty(0, vector<uint32_t>({0, 8, 16, 32, 64, 128}))},
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{"fdd_img",
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new StrProperty("")},
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};
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static const map<string, string> PropHelp = {
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{"rambank2_size", "specifies RAM bank 2 size in MB"},
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{"rambank3_size", "specifies RAM bank 3 size in MB"},
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{"gfxmem_size", "specifies video memory size in MB"},
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{"fdd_img", "specifies path to floppy disk image"},
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};
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static const map<string, tuple<PropMap, function<int(string&)>, string>> machines = {
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@ -26,6 +26,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include <cpu/ppc/ppcemu.h>
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#include <devices/common/machineid.h>
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#include <devices/floppy/floppyimg.h>
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#include <devices/ioctrl/macio.h>
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#include <devices/memctrl/mpc106.h>
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#include <devices/memctrl/spdram.h>
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@ -89,9 +90,9 @@ int create_gossamer(std::string& id) {
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}
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/* configure RAM slots */
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setup_ram_slot("RAM_DIMM_1", 0x57, GET_INT_PROP("rambank1_size"));
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setup_ram_slot("RAM_DIMM_2", 0x56, GET_INT_PROP("rambank2_size"));
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setup_ram_slot("RAM_DIMM_3", 0x55, GET_INT_PROP("rambank3_size"));
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setup_ram_slot("RAM_DIMM_1", 0x57, GET_INT_PROP("rambank1_size"));
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setup_ram_slot("RAM_DIMM_2", 0x56, GET_INT_PROP("rambank2_size"));
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setup_ram_slot("RAM_DIMM_3", 0x55, GET_INT_PROP("rambank3_size"));
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/* register ATI 3D Rage Pro video card with the PCI host bridge */
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gMachineObj->add_component("ATIRage",
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@ -102,6 +103,12 @@ int create_gossamer(std::string& id) {
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/* Init virtual CPU and request MPC750 CPU aka G3 */
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ppc_cpu_init(grackle_obj, PPC_VER::MPC750);
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/* check for a floppy image to be inserted into the virtual superdrive */
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std::string fdd_path = GET_STR_PROP("fdd_img");
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if (!fdd_path.empty()) {
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open_floppy_image(fdd_path.c_str());
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}
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LOG_F(INFO, "Initialization complete.\n");
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return 0;
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@ -26,6 +26,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include <cpu/ppc/ppcemu.h>
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#include <devices/common/machineid.h>
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#include <devices/floppy/floppyimg.h>
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#include <devices/ioctrl/amic.h>
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#include <devices/memctrl/hmc.h>
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#include <devices/sound/soundserver.h>
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@ -86,6 +87,12 @@ int create_pdm(std::string& id) {
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/* Init virtual CPU and request MPC601 */
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ppc_cpu_init(hmc_obj, PPC_VER::MPC601);
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/* check for a floppy image to be inserted into the virtual superdrive */
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std::string fdd_path = GET_STR_PROP("fdd_img");
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if (!fdd_path.empty()) {
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open_floppy_image(fdd_path.c_str());
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}
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LOG_F(INFO, "Initialization completed.\n");
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return 0;
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