Atmosphere/stratosphere/boot/source/boot_pmc_wrapper.cpp

51 lines
1.7 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_pmc_wrapper.hpp"
namespace ams::boot {
namespace {
/* Convenience definitions. */
constexpr u32 SmcFunctionId_AtmosphereReadWriteRegister = 0xF0000002;
constexpr u32 PmcPhysStart = 0x7000E400;
constexpr u32 PmcPhysEnd = 0x7000EFFF;
/* Helpers. */
bool IsValidPmcAddress(u32 phys_addr) {
return (phys_addr & 3) == 0 && PmcPhysStart <= phys_addr && phys_addr <= PmcPhysEnd;
}
inline u32 ReadWriteRegisterImpl(uintptr_t phys_addr, u32 value, u32 mask) {
u32 out_value;
R_ASSERT(spl::smc::ConvertResult(spl::smc::AtmosphereReadWriteRegister(phys_addr, mask, value, &out_value)));
return out_value;
}
}
u32 ReadPmcRegister(u32 phys_addr) {
AMS_ASSERT(IsValidPmcAddress(phys_addr));
return ReadWriteRegisterImpl(phys_addr, 0, 0);
}
void WritePmcRegister(u32 phys_addr, u32 value, u32 mask) {
AMS_ASSERT(IsValidPmcAddress(phys_addr));
ReadWriteRegisterImpl(phys_addr, value, mask);
}
}