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kern: simplify global rng initialization

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Michael Scire 2021-04-07 12:42:35 -07:00 committed by SciresM
parent 0f8b7be2d2
commit 8e4be9aef9
2 changed files with 30 additions and 14 deletions
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38
libraries/libmesosphere/source/board/nintendo/nx/kern_k_system_control.cpp
View file

@ -42,8 +42,8 @@ namespace ams::kern::board::nintendo::nx {
/* Nintendo uses std::mt19937_t for randomness. */
/* To save space (and because mt19337_t isn't secure anyway), */
/* We will use TinyMT. */
bool g_initialized_random_generator;
util::TinyMT g_random_generator;
constinit bool g_initialized_random_generator;
constinit util::TinyMT g_random_generator;
constinit KSpinLock g_random_lock;
ALWAYS_INLINE size_t GetRealMemorySizeForInit() {
@ -90,13 +90,10 @@ namespace ams::kern::board::nintendo::nx {
return value;
}
void EnsureRandomGeneratorInitialized() {
if (AMS_UNLIKELY(!g_initialized_random_generator)) {
u64 seed;
smc::GenerateRandomBytes(&seed, sizeof(seed));
g_random_generator.Initialize(reinterpret_cast<u32*>(&seed), sizeof(seed) / sizeof(u32));
g_initialized_random_generator = true;
}
ALWAYS_INLINE u64 GenerateRandomU64FromSmc() {
u64 value;
smc::GenerateRandomBytes(std::addressof(value), sizeof(value));
return value;
}
ALWAYS_INLINE u64 GenerateRandomU64FromGenerator() {
@ -439,6 +436,14 @@ namespace ams::kern::board::nintendo::nx {
/* System Initialization. */
void KSystemControl::InitializePhase1() {
/* Initialize our random generator. */
{
u64 seed;
smc::GenerateRandomBytes(std::addressof(seed), sizeof(seed));
g_random_generator.Initialize(reinterpret_cast<u32*>(std::addressof(seed)), sizeof(seed) / sizeof(u32));
g_initialized_random_generator = true;
}
/* Set IsDebugMode. */
{
KTargetSystem::SetIsDebugMode(GetConfigBool(smc::ConfigItem::IsDebugMode));
@ -544,18 +549,23 @@ namespace ams::kern::board::nintendo::nx {
KScopedInterruptDisable intr_disable;
KScopedSpinLock lk(g_random_lock);
EnsureRandomGeneratorInitialized();
return GenerateUniformRange(min, max, GenerateRandomU64FromGenerator);
if (AMS_LIKELY(g_initialized_random_generator)) {
return GenerateUniformRange(min, max, GenerateRandomU64FromGenerator);
} else {
return GenerateUniformRange(min, max, GenerateRandomU64FromSmc);
}
}
u64 KSystemControl::GenerateRandomU64() {
KScopedInterruptDisable intr_disable;
KScopedSpinLock lk(g_random_lock);
EnsureRandomGeneratorInitialized();
return GenerateRandomU64FromGenerator();
if (AMS_LIKELY(g_initialized_random_generator)) {
return GenerateRandomU64FromGenerator();
} else {
return GenerateRandomU64FromSmc();
}
}
void KSystemControl::SleepSystem() {

6
libraries/libmesosphere/source/kern_main.cpp
View file

@ -49,6 +49,9 @@ namespace ams::kern {
/* Initialize the carveout and the system resource limit. */
KSystemControl::InitializePhase1();
/* Synchronize all cores before proceeding, to ensure access to the global rng is consistent. */
cpu::SynchronizeAllCores();
/* Initialize the memory manager and the KPageBuffer slabheap. */
{
const auto &management_region = KMemoryLayout::GetPoolManagementRegion();
@ -74,6 +77,9 @@ namespace ams::kern {
Kernel::InitializeResourceManagers(pt_heap_region.GetAddress(), pt_heap_region.GetSize());
}
} else {
/* Synchronize all cores before proceeding, to ensure access to the global rng is consistent. */
cpu::SynchronizeAllCores();
}
/* Initialize the supervisor page table for each core. */