mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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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 <http://www.gnu.org/licenses/>.
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*/
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#include "boot_calibration.hpp"
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namespace ams::boot {
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namespace {
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/* Convenience definitions. */
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constexpr size_t BatteryLotOffset = 0x2CE0;
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constexpr size_t BatteryLotSize = 0x20;
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constexpr size_t BatteryVersionOffset = 0x4310;
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constexpr size_t BatteryVersionSize = 0x10;
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constexpr u32 DefaultBatteryVendor = static_cast<u32>('A');
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constexpr u32 DefaultBatteryVersion = 0;
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/* Helpers. */
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constexpr u16 GetCrc16(const void *data, size_t size) {
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constexpr u16 s_crc_table[0x10] = {
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0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
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0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400
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};
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AMS_ABORT_UNLESS(data != nullptr);
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u16 crc16 = 0x55AA;
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const u8 *data_u8 = reinterpret_cast<const u8 *>(data);
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for (size_t i = 0; i < size; i++) {
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crc16 = (crc16 >> 4) ^ (s_crc_table[crc16 & 0xF]) ^ (s_crc_table[data_u8[i] & 0xF]);
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crc16 = (crc16 >> 4) ^ (s_crc_table[crc16 & 0xF]) ^ (s_crc_table[(data_u8[i] >> 4) & 0xF]);
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}
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return crc16;
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}
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Result ValidateCalibrationCrc16(const void *data, size_t size) {
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const u8 *data_u8 = reinterpret_cast<const u8 *>(data);
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const bool crc_valid = GetCrc16(data, size - sizeof(u16)) == *(reinterpret_cast<const u16 *>(&data_u8[size - sizeof(u16)]));
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R_UNLESS(crc_valid, cal::ResultCalibrationDataCrcError());
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return ResultSuccess();
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}
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Result GetBatteryVendorImpl(u32 *vendor) {
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FsStorage s;
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R_TRY(fsOpenBisStorage(&s, FsBisPartitionId_CalibrationBinary));
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ON_SCOPE_EXIT { fsStorageClose(&s); };
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u8 battery_lot[BatteryLotSize];
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R_TRY(fsStorageRead(&s, BatteryLotOffset, battery_lot, sizeof(battery_lot)));
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R_TRY(ValidateCalibrationCrc16(battery_lot, sizeof(battery_lot)));
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*vendor = battery_lot[7];
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return ResultSuccess();
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}
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Result GetBatteryVersionImpl(u32 *version) {
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FsStorage s;
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R_TRY(fsOpenBisStorage(&s, FsBisPartitionId_CalibrationBinary));
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ON_SCOPE_EXIT { fsStorageClose(&s); };
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u8 battery_version[BatteryVersionSize];
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R_TRY(fsStorageRead(&s, BatteryVersionOffset, battery_version, sizeof(battery_version)));
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R_TRY(ValidateCalibrationCrc16(battery_version, sizeof(battery_version)));
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*version = battery_version[0];
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return ResultSuccess();
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}
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}
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u32 GetBatteryVendor() {
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u32 vendor;
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if (R_FAILED(GetBatteryVendorImpl(&vendor))) {
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return DefaultBatteryVendor;
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}
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return vendor;
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}
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u32 GetBatteryVersion() {
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u32 version;
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if (R_FAILED(GetBatteryVersionImpl(&version))) {
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return DefaultBatteryVersion;
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}
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return version;
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}
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}
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