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https://github.com/Atmosphere-NX/Atmosphere-libs.git
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103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2019 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 <mesosphere.hpp>
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#include "kern_secure_monitor.hpp"
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namespace ams::kern {
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namespace {
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/* Convenience definitions. */
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constexpr size_t FourGigabytes = 0x100000000ul;
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constexpr size_t SixGigabytes = 0x180000000ul;
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constexpr size_t EightGigabytes = 0x200000000ul;
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ALWAYS_INLINE size_t GetRealMemorySizeForInit() {
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/* TODO: Move this into a header for the MC in general. */
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constexpr u32 MemoryControllerConfigurationRegister = 0x70019050;
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u32 config_value;
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MESOSPHERE_ABORT_UNLESS(smc::init::ReadWriteRegister(&config_value, MemoryControllerConfigurationRegister, 0, 0));
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return static_cast<size_t>(config_value & 0x3FFF) << 20;
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}
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ALWAYS_INLINE u64 GetKernelConfigurationForInit() {
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u64 value = 0;
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smc::init::GetConfig(&value, 1, smc::ConfigItem::KernelConfiguration);
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return value;
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}
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ALWAYS_INLINE u64 GenerateRandomU64ForInit() {
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u64 value;
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smc::init::GenerateRandomBytes(&value, sizeof(value));
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return value;
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}
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ALWAYS_INLINE smc::MemoryMode GetMemoryModeForInit() {
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return static_cast<smc::MemoryMode>((GetKernelConfigurationForInit() >> 10) & 0x3);
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}
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ALWAYS_INLINE size_t GetIntendedMemorySizeForInit() {
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switch (GetMemoryModeForInit()) {
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case smc::MemoryMode_4GB:
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default: /* All invalid modes should go to 4GB. */
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return FourGigabytes;
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case smc::MemoryMode_6GB:
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return SixGigabytes;
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case smc::MemoryMode_8GB:
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return EightGigabytes;
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}
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}
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}
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/* Initialization. */
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KPhysicalAddress KSystemControl::Init::GetKernelPhysicalBaseAddress(uintptr_t base_address) {
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const size_t real_dram_size = GetRealMemorySizeForInit();
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const size_t intended_dram_size = GetIntendedMemorySizeForInit();
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if (intended_dram_size * 2 < real_dram_size) {
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return base_address;
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} else {
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return base_address + ((real_dram_size - intended_dram_size) / 2);
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}
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}
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bool KSystemControl::Init::ShouldIncreaseThreadResourceLimit() {
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return (GetKernelConfigurationForInit() >> 3) & 1;
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}
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/* Randomness for Initialization. */
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void KSystemControl::Init::GenerateRandomBytes(void *dst, size_t size) {
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MESOSPHERE_ABORT_UNLESS(size <= 0x38);
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smc::init::GenerateRandomBytes(dst, size);
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}
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u64 KSystemControl::Init::GenerateRandomRange(u64 min, u64 max) {
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const u64 range_size = ((max + 1) - min);
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const u64 effective_max = (std::numeric_limits<u64>::max() / range_size) * range_size;
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while (true) {
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if (const u64 rnd = GenerateRandomU64ForInit(); rnd < effective_max) {
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return min + (rnd % range_size);
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}
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}
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}
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void KSystemControl::StopSystem() {
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/* Display a panic screen via exosphere. */
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smc::Panic(0xF00);
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while (true) { /* ... */ }
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}
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} |