Atmosphere/stratosphere/boot/source/boot_check_clock.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
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*
* 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 <stratosphere.hpp>
#include "boot_check_clock.hpp"
#include "boot_power_utils.hpp"
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namespace ams::boot {
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namespace {
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/* Convenience definitions. */
constexpr u32 ExpectedPlluDivP = (1 << 16);
constexpr u32 ExpectedPlluDivN = (25 << 8);
constexpr u32 ExpectedPlluDivM = (2 << 0);
constexpr u32 ExpectedPlluVal = (ExpectedPlluDivP | ExpectedPlluDivN | ExpectedPlluDivM);
constexpr u32 ExpectedPlluMask = 0x1FFFFF;
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constexpr u32 ExpectedUtmipDivN = (25 << 16);
constexpr u32 ExpectedUtmipDivM = (1 << 8);
constexpr u32 ExpectedUtmipVal = (ExpectedUtmipDivN | ExpectedUtmipDivM);
constexpr u32 ExpectedUtmipMask = 0xFFFF00;
/* Helpers. */
bool IsUsbClockValid() {
uintptr_t car_regs = dd::GetIoMapping(0x60006000ul, os::MemoryPageSize);
const u32 pllu = reg::Read(car_regs + 0xC0);
const u32 utmip = reg::Read(car_regs + 0x480);
return ((pllu & ExpectedPlluMask) == ExpectedPlluVal) && ((utmip & ExpectedUtmipMask) == ExpectedUtmipVal);
}
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}
void CheckClock() {
if (!IsUsbClockValid()) {
/* Sleep for 1s, then reboot. */
svcSleepThread(1'000'000'000ul);
RebootSystem();
}
}
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}