dingusppc/devices/common/ata/atahd.cpp

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 divingkatae and maximum
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(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file ATA hard disk emulation. */
#include <devices/common/ata/atahd.h>
#include <cstring>
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#include <sys/stat.h>
#include <fstream>
#include <string>
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#include <loguru.hpp>
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using namespace ata_interface;
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AtaHardDisk::AtaHardDisk() : AtaBaseDevice("ATA-HD")
{
}
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void AtaHardDisk::insert_image(std::string filename) {
this->hdd_img.open(filename, std::fstream::out | std::fstream::in | std::fstream::binary);
struct stat stat_buf;
int rc = stat(filename.c_str(), &stat_buf);
if (!rc) {
this->img_size = stat_buf.st_size;
} else {
ABORT_F("AtaHardDisk: could not determine file size using stat()");
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}
this->hdd_img.seekg(0, std::ios_base::beg);
}
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int AtaHardDisk::perform_command()
{
LOG_F(INFO, "%s: command 0x%x requested", this->name.c_str(), this->r_command);
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this->r_status |= BSY;
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this->r_status &= ~DRDY;
switch (this->r_command) {
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case NOP:
break;
case RESET_ATAPI:
device_reset();
break;
case RECALIBRATE:
hdd_img.seekg(0, std::ios::beg);
this->r_error = 0;
this->r_cylinder_lo = 0;
this->r_cylinder_hi = 0;
break;
case READ_SECTOR:
case READ_SECTOR_NR: {
this->r_status |= DRQ;
uint16_t sec_count = (this->r_sect_count == 0) ? 256 : this->r_sect_count;
uint32_t sector = (r_sect_num << 16);
sector |= ((this->r_cylinder_lo) << 8) + (this->r_cylinder_hi);
uint64_t offset = sector * ATA_HD_SEC_SIZE;
hdd_img.seekg(offset, std::ios::beg);
hdd_img.read(buffer, sec_count * ATA_HD_SEC_SIZE);
this->r_status &= ~DRQ;
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}
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break;
case WRITE_SECTOR:
case WRITE_SECTOR_NR: {
this->r_status |= DRQ;
uint16_t sec_count = (this->r_sect_count == 0) ? 256 : this->r_sect_count;
uint32_t sector = (r_sect_num << 16);
sector |= ((this->r_cylinder_lo) << 8) + (this->r_cylinder_hi);
uint64_t offset = sector * ATA_HD_SEC_SIZE;
hdd_img.seekg(offset, std::ios::beg);
hdd_img.write(buffer, sec_count * ATA_HD_SEC_SIZE);
this->r_status &= ~DRQ;
}
break;
case INIT_DEV_PARAM:
break;
case DIAGNOSTICS: {
this->r_status |= DRQ;
int ret_code = this->r_error;
this->r_status &= ~DRQ;
return ret_code;
}
break;
case IDENTIFY_DEVICE:
this->r_status |= DRQ;
std::memcpy(buffer, this->hd_id_data, ATA_HD_SEC_SIZE);
this->r_status &= ~DRQ;
break;
default:
LOG_F(ERROR, "%s: unknown ATA command 0x%x", this->name.c_str(), this->r_command);
this->r_status &= ~BSY;
this->r_status |= ERR;
return -1;
}
this->r_status &= ~BSY;
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this->r_status |= DRDY;
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return 0;
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}