mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-27 06:12:15 +00:00
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/*
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include "boot_calibration.hpp"
|
|
|
|
namespace ams::boot {
|
|
|
|
namespace {
|
|
|
|
/* Convenience definitions. */
|
|
constexpr size_t BatteryLotOffset = 0x2CE0;
|
|
constexpr size_t BatteryLotSize = 0x20;
|
|
constexpr size_t BatteryVersionOffset = 0x4310;
|
|
constexpr size_t BatteryVersionSize = 0x10;
|
|
|
|
constexpr u32 DefaultBatteryVendor = static_cast<u32>('A');
|
|
constexpr u32 DefaultBatteryVersion = 0;
|
|
|
|
/* Helpers. */
|
|
constexpr u16 GetCrc16(const void *data, size_t size) {
|
|
constexpr u16 s_crc_table[0x10] = {
|
|
0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
|
|
0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400
|
|
};
|
|
|
|
AMS_ASSERT(data != nullptr);
|
|
|
|
u16 crc16 = 0x55AA;
|
|
const u8 *data_u8 = reinterpret_cast<const u8 *>(data);
|
|
for (size_t i = 0; i < size; i++) {
|
|
crc16 = (crc16 >> 4) ^ (s_crc_table[crc16 & 0xF]) ^ (s_crc_table[data_u8[i] & 0xF]);
|
|
crc16 = (crc16 >> 4) ^ (s_crc_table[crc16 & 0xF]) ^ (s_crc_table[(data_u8[i] >> 4) & 0xF]);
|
|
}
|
|
return crc16;
|
|
}
|
|
|
|
Result ValidateCalibrationCrc16(const void *data, size_t size) {
|
|
const u8 *data_u8 = reinterpret_cast<const u8 *>(data);
|
|
const bool crc_valid = GetCrc16(data, size - sizeof(u16)) == *(reinterpret_cast<const u16 *>(&data_u8[size - sizeof(u16)]));
|
|
R_UNLESS(crc_valid, cal::ResultCalibrationDataCrcError());
|
|
return ResultSuccess();
|
|
}
|
|
|
|
Result GetBatteryVendorImpl(u32 *vendor) {
|
|
FsStorage s;
|
|
R_TRY(fsOpenBisStorage(&s, FsBisPartitionId_CalibrationBinary));
|
|
ON_SCOPE_EXIT { fsStorageClose(&s); };
|
|
|
|
u8 battery_lot[BatteryLotSize];
|
|
R_TRY(fsStorageRead(&s, BatteryLotOffset, battery_lot, sizeof(battery_lot)));
|
|
|
|
R_TRY(ValidateCalibrationCrc16(battery_lot, sizeof(battery_lot)));
|
|
|
|
*vendor = battery_lot[7];
|
|
return ResultSuccess();
|
|
}
|
|
|
|
Result GetBatteryVersionImpl(u32 *version) {
|
|
FsStorage s;
|
|
R_TRY(fsOpenBisStorage(&s, FsBisPartitionId_CalibrationBinary));
|
|
ON_SCOPE_EXIT { fsStorageClose(&s); };
|
|
|
|
u8 battery_version[BatteryVersionSize];
|
|
R_TRY(fsStorageRead(&s, BatteryVersionOffset, battery_version, sizeof(battery_version)));
|
|
|
|
R_TRY(ValidateCalibrationCrc16(battery_version, sizeof(battery_version)));
|
|
|
|
*version = battery_version[0];
|
|
return ResultSuccess();
|
|
}
|
|
|
|
}
|
|
|
|
u32 GetBatteryVendor() {
|
|
u32 vendor;
|
|
if (R_FAILED(GetBatteryVendorImpl(&vendor))) {
|
|
return DefaultBatteryVendor;
|
|
}
|
|
return vendor;
|
|
}
|
|
|
|
u32 GetBatteryVersion() {
|
|
u32 version;
|
|
if (R_FAILED(GetBatteryVersionImpl(&version))) {
|
|
return DefaultBatteryVersion;
|
|
}
|
|
return version;
|
|
}
|
|
|
|
}
|