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Atmosphere-libs/libmesosphere/source/board/nintendo/nx/kern_k_sleep_manager.cpp

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/*
* Copyright (c) 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 <mesosphere.hpp>
#include "kern_k_sleep_manager.hpp"
#include "kern_secure_monitor.hpp"
#include "kern_lps_driver.hpp"
namespace ams::kern::init {
void StartOtherCore(const ams::kern::init::KInitArguments *init_args);
}
namespace ams::kern::board::nintendo::nx {
namespace {
/* Struct representing registers saved on wake/sleep. */
class SavedSystemRegisters {
private:
u64 ttbr0_el1;
u64 elr_el1;
u64 sp_el0;
u64 spsr_el1;
u64 daif;
u64 cpacr_el1;
u64 vbar_el1;
u64 csselr_el1;
u64 cntp_ctl_el0;
u64 cntp_cval_el0;
u64 cntkctl_el1;
u64 tpidr_el0;
u64 tpidrro_el0;
u64 mdscr_el1;
u64 contextidr_el1;
u64 dbgwcrN_el1[16];
u64 dbgwvrN_el1[16];
u64 dbgbcrN_el1[16];
u64 dbgbvrN_el1[16];
u64 pmccfiltr_el0;
u64 pmccntr_el0;
u64 pmcntenset_el0;
u64 pmcr_el0;
u64 pmevcntrN_el0[31];
u64 pmevtyperN_el0[31];
u64 pmintenset_el1;
u64 pmovsset_el0;
u64 pmselr_el0;
u64 pmuserenr_el0;
public:
void Save();
void Restore() const;
};
constexpr s32 SleepManagerThreadPriority = 2;
/* Globals for sleep/wake. */
constinit u64 g_sleep_target_cores;
constinit KLightLock g_request_lock;
constinit KLightLock g_cv_lock;
constinit KLightConditionVariable g_cv{util::ConstantInitialize};
alignas(1_KB) constinit u64 g_sleep_buffers[cpu::NumCores][1_KB / sizeof(u64)];
constinit ams::kern::init::KInitArguments g_sleep_init_arguments[cpu::NumCores];
constinit SavedSystemRegisters g_sleep_system_registers[cpu::NumCores] = {};
void WaitOtherCpuPowerOff() {
constexpr u64 PmcPhysicalAddress = 0x7000E400;
constexpr u32 PWRGATE_STATUS_CE123_MASK = ((1u << 3) - 1) << 9;
u32 value;
do {
bool res = smc::ReadWriteRegister(std::addressof(value), PmcPhysicalAddress + APBDEV_PMC_PWRGATE_STATUS, 0, 0);
MESOSPHERE_ASSERT(res);
MESOSPHERE_UNUSED(res);
} while ((value & PWRGATE_STATUS_CE123_MASK) != 0);
}
void SavedSystemRegisters::Save() {
/* Save system registers. */
this->ttbr0_el1 = cpu::GetTtbr0El1();
this->tpidr_el0 = cpu::GetTpidrEl0();
this->elr_el1 = cpu::GetElrEl1();
this->sp_el0 = cpu::GetSpEl0();
this->spsr_el1 = cpu::GetSpsrEl1();
this->daif = cpu::GetDaif();
this->cpacr_el1 = cpu::GetCpacrEl1();
this->vbar_el1 = cpu::GetVbarEl1();
this->csselr_el1 = cpu::GetCsselrEl1();
this->cntp_ctl_el0 = cpu::GetCntpCtlEl0();
this->cntp_cval_el0 = cpu::GetCntpCvalEl0();
this->cntkctl_el1 = cpu::GetCntkCtlEl1();
this->tpidrro_el0 = cpu::GetTpidrRoEl0();
/* Save pmu registers. */
{
/* Get and clear pmcr_el0 */
this->pmcr_el0 = cpu::GetPmcrEl0();
cpu::SetPmcrEl0(0);
cpu::EnsureInstructionConsistency();
/* Save other pmu registers. */
this->pmuserenr_el0 = cpu::GetPmUserEnrEl0();
this->pmselr_el0 = cpu::GetPmSelrEl0();
this->pmccfiltr_el0 = cpu::GetPmcCfiltrEl0();
this->pmcntenset_el0 = cpu::GetPmCntEnSetEl0();
this->pmintenset_el1 = cpu::GetPmIntEnSetEl1();
this->pmovsset_el0 = cpu::GetPmOvsSetEl0();
this->pmccntr_el0 = cpu::GetPmcCntrEl0();
switch (cpu::PerformanceMonitorsControlRegisterAccessor(this->pmcr_el0).GetN()) {
#define HANDLE_PMU_CASE(N) \
case (N+1): \
this->pmevcntrN_el0 [ N ] = cpu::GetPmevCntr##N##El0(); \
this->pmevtyperN_el0[ N ] = cpu::GetPmevTyper##N##El0(); \
[[fallthrough]]
HANDLE_PMU_CASE(30);
HANDLE_PMU_CASE(29);
HANDLE_PMU_CASE(28);
HANDLE_PMU_CASE(27);
HANDLE_PMU_CASE(26);
HANDLE_PMU_CASE(25);
HANDLE_PMU_CASE(24);
HANDLE_PMU_CASE(23);
HANDLE_PMU_CASE(22);
HANDLE_PMU_CASE(21);
HANDLE_PMU_CASE(20);
HANDLE_PMU_CASE(19);
HANDLE_PMU_CASE(18);
HANDLE_PMU_CASE(17);
HANDLE_PMU_CASE(16);
HANDLE_PMU_CASE(15);
HANDLE_PMU_CASE(14);
HANDLE_PMU_CASE(13);
HANDLE_PMU_CASE(12);
HANDLE_PMU_CASE(11);
HANDLE_PMU_CASE(10);
HANDLE_PMU_CASE( 9);
HANDLE_PMU_CASE( 8);
HANDLE_PMU_CASE( 7);
HANDLE_PMU_CASE( 6);
HANDLE_PMU_CASE( 5);
HANDLE_PMU_CASE( 4);
HANDLE_PMU_CASE( 3);
HANDLE_PMU_CASE( 2);
HANDLE_PMU_CASE( 1);
HANDLE_PMU_CASE( 0);
#undef HANDLE_PMU_CASE
case 0:
default:
break;
}
}
/* Save debug registers. */
const u64 dfr0 = cpu::GetIdAa64Dfr0El1();
this->mdscr_el1 = cpu::GetMdscrEl1();
this->contextidr_el1 = cpu::GetContextidrEl1();
/* Save watchpoints. */
switch (cpu::DebugFeatureRegisterAccessor(dfr0).GetNumWatchpoints()) {
#define HANDLE_DBG_CASE(N) \
case N: \
this->dbgwcrN_el1[ N ] = cpu::GetDbgWcr##N##El1(); \
this->dbgwvrN_el1[ N ] = cpu::GetDbgWvr##N##El1(); \
[[fallthrough]]
HANDLE_DBG_CASE(15);
HANDLE_DBG_CASE(14);
HANDLE_DBG_CASE(13);
HANDLE_DBG_CASE(12);
HANDLE_DBG_CASE(11);
HANDLE_DBG_CASE(10);
HANDLE_DBG_CASE( 9);
HANDLE_DBG_CASE( 8);
HANDLE_DBG_CASE( 7);
HANDLE_DBG_CASE( 6);
HANDLE_DBG_CASE( 5);
HANDLE_DBG_CASE( 4);
HANDLE_DBG_CASE( 3);
HANDLE_DBG_CASE( 2);
#undef HANDLE_DBG_CASE
case 1:
this->dbgwcrN_el1[1] = cpu::GetDbgWcr1El1();
this->dbgwvrN_el1[1] = cpu::GetDbgWvr1El1();
this->dbgwcrN_el1[0] = cpu::GetDbgWcr0El1();
this->dbgwvrN_el1[0] = cpu::GetDbgWvr0El1();
[[fallthrough]];
default:
break;
}
/* Save breakpoints. */
switch (cpu::DebugFeatureRegisterAccessor(dfr0).GetNumBreakpoints()) {
#define HANDLE_DBG_CASE(N) \
case N: \
this->dbgbcrN_el1[ N ] = cpu::GetDbgBcr##N##El1(); \
this->dbgbvrN_el1[ N ] = cpu::GetDbgBvr##N##El1(); \
[[fallthrough]]
HANDLE_DBG_CASE(15);
HANDLE_DBG_CASE(14);
HANDLE_DBG_CASE(13);
HANDLE_DBG_CASE(12);
HANDLE_DBG_CASE(11);
HANDLE_DBG_CASE(10);
HANDLE_DBG_CASE( 9);
HANDLE_DBG_CASE( 8);
HANDLE_DBG_CASE( 7);
HANDLE_DBG_CASE( 6);
HANDLE_DBG_CASE( 5);
HANDLE_DBG_CASE( 4);
HANDLE_DBG_CASE( 3);
HANDLE_DBG_CASE( 2);
#undef HANDLE_DBG_CASE
case 1:
this->dbgbcrN_el1[1] = cpu::GetDbgBcr1El1();
this->dbgbvrN_el1[1] = cpu::GetDbgBvr1El1();
[[fallthrough]];
default:
break;
}
this->dbgbcrN_el1[0] = cpu::GetDbgBcr0El1();
this->dbgbvrN_el1[0] = cpu::GetDbgBvr0El1();
cpu::EnsureInstructionConsistency();
/* Clear mdscr_el1. */
cpu::SetMdscrEl1(0);
cpu::EnsureInstructionConsistency();
}
void SavedSystemRegisters::Restore() const {
/* Restore debug registers. */
const u64 dfr0 = cpu::GetIdAa64Dfr0El1();
cpu::EnsureInstructionConsistency();
cpu::SetMdscrEl1(0);
cpu::EnsureInstructionConsistency();
cpu::SetOslarEl1(0);
cpu::EnsureInstructionConsistency();
/* Restore watchpoints. */
switch (cpu::DebugFeatureRegisterAccessor(dfr0).GetNumWatchpoints()) {
#define HANDLE_DBG_CASE(N) \
case N: \
cpu::SetDbgWcr##N##El1(this->dbgwcrN_el1[ N ]); \
cpu::SetDbgWvr##N##El1(this->dbgwvrN_el1[ N ]); \
[[fallthrough]]
HANDLE_DBG_CASE(15);
HANDLE_DBG_CASE(14);
HANDLE_DBG_CASE(13);
HANDLE_DBG_CASE(12);
HANDLE_DBG_CASE(11);
HANDLE_DBG_CASE(10);
HANDLE_DBG_CASE( 9);
HANDLE_DBG_CASE( 8);
HANDLE_DBG_CASE( 7);
HANDLE_DBG_CASE( 6);
HANDLE_DBG_CASE( 5);
HANDLE_DBG_CASE( 4);
HANDLE_DBG_CASE( 3);
HANDLE_DBG_CASE( 2);
#undef HANDLE_DBG_CASE
case 1:
cpu::SetDbgWcr1El1(this->dbgwcrN_el1[1]);
cpu::SetDbgWvr1El1(this->dbgwvrN_el1[1]);
cpu::SetDbgWcr0El1(this->dbgwcrN_el1[0]);
cpu::SetDbgWvr0El1(this->dbgwvrN_el1[0]);
[[fallthrough]];
default:
break;
}
/* Restore breakpoints. */
switch (cpu::DebugFeatureRegisterAccessor(dfr0).GetNumBreakpoints()) {
#define HANDLE_DBG_CASE(N) \
case N: \
cpu::SetDbgBcr##N##El1(this->dbgbcrN_el1[ N ]); \
cpu::SetDbgBvr##N##El1(this->dbgbvrN_el1[ N ]); \
[[fallthrough]]
HANDLE_DBG_CASE(15);
HANDLE_DBG_CASE(14);
HANDLE_DBG_CASE(13);
HANDLE_DBG_CASE(12);
HANDLE_DBG_CASE(11);
HANDLE_DBG_CASE(10);
HANDLE_DBG_CASE( 9);
HANDLE_DBG_CASE( 8);
HANDLE_DBG_CASE( 7);
HANDLE_DBG_CASE( 6);
HANDLE_DBG_CASE( 5);
HANDLE_DBG_CASE( 4);
HANDLE_DBG_CASE( 3);
HANDLE_DBG_CASE( 2);
#undef HANDLE_DBG_CASE
case 1:
cpu::SetDbgBcr1El1(this->dbgbcrN_el1[1]);
cpu::SetDbgBvr1El1(this->dbgbvrN_el1[1]);
[[fallthrough]];
default:
break;
}
cpu::SetDbgBcr0El1(this->dbgbcrN_el1[0]);
cpu::SetDbgBvr0El1(this->dbgbvrN_el1[0]);
cpu::EnsureInstructionConsistency();
cpu::SetContextidrEl1(this->contextidr_el1);
cpu::EnsureInstructionConsistency();
cpu::SetMdscrEl1(this->mdscr_el1);
cpu::EnsureInstructionConsistency();
/* Restore pmu registers. */
cpu::SetPmUserEnrEl0(0);
cpu::PerformanceMonitorsControlRegisterAccessor(0).SetEventCounterReset(true).SetCycleCounterReset(true).Store();
cpu::EnsureInstructionConsistency();
cpu::SetPmOvsClrEl0(static_cast<u64>(static_cast<u32>(~u32())));
cpu::SetPmIntEnClrEl1(static_cast<u64>(static_cast<u32>(~u32())));
cpu::SetPmCntEnClrEl0(static_cast<u64>(static_cast<u32>(~u32())));
switch (cpu::PerformanceMonitorsControlRegisterAccessor(this->pmcr_el0).GetN()) {
#define HANDLE_PMU_CASE(N) \
case (N+1): \
cpu::SetPmevCntr##N##El0 (this->pmevcntrN_el0 [ N ]); \
cpu::SetPmevTyper##N##El0(this->pmevtyperN_el0[ N ]); \
[[fallthrough]]
HANDLE_PMU_CASE(30);
HANDLE_PMU_CASE(29);
HANDLE_PMU_CASE(28);
HANDLE_PMU_CASE(27);
HANDLE_PMU_CASE(26);
HANDLE_PMU_CASE(25);
HANDLE_PMU_CASE(24);
HANDLE_PMU_CASE(23);
HANDLE_PMU_CASE(22);
HANDLE_PMU_CASE(21);
HANDLE_PMU_CASE(20);
HANDLE_PMU_CASE(19);
HANDLE_PMU_CASE(18);
HANDLE_PMU_CASE(17);
HANDLE_PMU_CASE(16);
HANDLE_PMU_CASE(15);
HANDLE_PMU_CASE(14);
HANDLE_PMU_CASE(13);
HANDLE_PMU_CASE(12);
HANDLE_PMU_CASE(11);
HANDLE_PMU_CASE(10);
HANDLE_PMU_CASE( 9);
HANDLE_PMU_CASE( 8);
HANDLE_PMU_CASE( 7);
HANDLE_PMU_CASE( 6);
HANDLE_PMU_CASE( 5);
HANDLE_PMU_CASE( 4);
HANDLE_PMU_CASE( 3);
HANDLE_PMU_CASE( 2);
HANDLE_PMU_CASE( 1);
HANDLE_PMU_CASE( 0);
#undef HANDLE_PMU_CASE
case 0:
default:
break;
}
cpu::SetPmUserEnrEl0 (this->pmuserenr_el0);
cpu::SetPmSelrEl0 (this->pmselr_el0);
cpu::SetPmcCfiltrEl0 (this->pmccfiltr_el0);
cpu::SetPmCntEnSetEl0(this->pmcntenset_el0);
cpu::SetPmIntEnSetEl1(this->pmintenset_el1);
cpu::SetPmOvsSetEl0 (this->pmovsset_el0);
cpu::SetPmcCntrEl0 (this->pmccntr_el0);
cpu::EnsureInstructionConsistency();
cpu::SetPmcrEl0(this->pmcr_el0);
cpu::EnsureInstructionConsistency();
/* Restore system registers. */
cpu::SetTtbr0El1 (this->ttbr0_el1);
cpu::SetTpidrEl0 (this->tpidr_el0);
cpu::SetElrEl1 (this->elr_el1);
cpu::SetSpEl0 (this->sp_el0);
cpu::SetSpsrEl1 (this->spsr_el1);
cpu::SetDaif (this->daif);
cpu::SetCpacrEl1 (this->cpacr_el1);
cpu::SetVbarEl1 (this->vbar_el1);
cpu::SetCsselrEl1 (this->csselr_el1);
cpu::SetCntpCtlEl0 (this->cntp_ctl_el0);
cpu::SetCntpCvalEl0(this->cntp_cval_el0);
cpu::SetCntkCtlEl1 (this->cntkctl_el1);
cpu::SetTpidrRoEl0 (this->tpidrro_el0);
cpu::EnsureInstructionConsistency();
/* Invalidate the entire tlb. */
cpu::InvalidateEntireTlb();
}
}
void KSleepManager::Initialize() {
/* Create a sleep manager thread for each core. */
for (size_t core_id = 0; core_id < cpu::NumCores; core_id++) {
/* Reserve a thread from the system limit. */
MESOSPHERE_ABORT_UNLESS(Kernel::GetSystemResourceLimit().Reserve(ams::svc::LimitableResource_ThreadCountMax, 1));
/* Create a new thread. */
KThread *new_thread = KThread::Create();
MESOSPHERE_ABORT_UNLESS(new_thread != nullptr);
/* Launch the new thread. */
MESOSPHERE_R_ABORT_UNLESS(KThread::InitializeKernelThread(new_thread, KSleepManager::ProcessRequests, reinterpret_cast<uintptr_t>(g_sleep_buffers[core_id]), SleepManagerThreadPriority, static_cast<s32>(core_id)));
/* Register the new thread. */
KThread::Register(new_thread);
/* Run the thread. */
new_thread->Run();
}
}
void KSleepManager::SleepSystem() {
/* Ensure device mappings are not modified during sleep. */
KDevicePageTable::Lock();
ON_SCOPE_EXIT { KDevicePageTable::Unlock(); };
/* Request that the system sleep. */
{
KScopedLightLock lk(g_request_lock);
/* Signal the manager to sleep on all cores. */
{
KScopedLightLock lk(g_cv_lock);
MESOSPHERE_ABORT_UNLESS(g_sleep_target_cores == 0);
g_sleep_target_cores = (1ul << cpu::NumCores) - 1;
g_cv.Broadcast();
while (g_sleep_target_cores != 0) {
g_cv.Wait(std::addressof(g_cv_lock));
}
}
}
}
void KSleepManager::ProcessRequests(uintptr_t sleep_buffer) {
const auto target_fw = GetTargetFirmware();
const s32 core_id = GetCurrentCoreId();
ams::kern::init::KInitArguments * const init_args = g_sleep_init_arguments + core_id;
KPhysicalAddress start_core_phys_addr = Null<KPhysicalAddress>;
KPhysicalAddress init_args_phys_addr = Null<KPhysicalAddress>;
/* Get the physical addresses we'll need. */
{
MESOSPHERE_ABORT_UNLESS(Kernel::GetKernelPageTable().GetPhysicalAddress(std::addressof(start_core_phys_addr), KProcessAddress(&::ams::kern::init::StartOtherCore)));
MESOSPHERE_ABORT_UNLESS(Kernel::GetKernelPageTable().GetPhysicalAddress(std::addressof(init_args_phys_addr), KProcessAddress(init_args)));
}
const u64 target_core_mask = (1ul << core_id);
const bool use_legacy_lps_driver = target_fw < TargetFirmware_2_0_0;
/* Loop, processing sleep when requested. */
while (true) {
/* Wait for a request. */
{
KScopedLightLock lk(g_cv_lock);
while ((g_sleep_target_cores & target_core_mask) == 0) {
g_cv.Wait(std::addressof(g_cv_lock));
}
}
/* If on core 0, ensure the legacy lps driver is initialized. */
if (use_legacy_lps_driver && core_id == 0) {
lps::Initialize();
}
/* Perform Sleep/Wake sequence. */
{
/* Disable interrupts. */
KScopedInterruptDisable di;
/* Save the system registers for the current core. */
g_sleep_system_registers[core_id].Save();
/* Invalidate the entire tlb. */
cpu::InvalidateEntireTlb();
/* Ensure that all cores get to this point before continuing. */
cpu::SynchronizeAllCores();
/* If on core 0, put the device page tables to sleep. */
if (core_id == 0) {
KDevicePageTable::Sleep();
}
/* Ensure that all cores get to this point before continuing. */
cpu::SynchronizeAllCores();
/* Save the interrupt manager's state. */
Kernel::GetInterruptManager().Save(core_id);
/* Setup the initial arguments. */
{
/* Determine whether we're running on a cortex-a53 or a-57. */
cpu::MainIdRegisterAccessor midr_el1;
const auto implementer = midr_el1.GetImplementer();
const auto primary_part = midr_el1.GetPrimaryPartNumber();
const bool needs_cpu_ctlr = (implementer == cpu::MainIdRegisterAccessor::Implementer::ArmLimited) && (primary_part == cpu::MainIdRegisterAccessor::PrimaryPartNumber::CortexA57 || primary_part == cpu::MainIdRegisterAccessor::PrimaryPartNumber::CortexA53);
init_args->cpuactlr = needs_cpu_ctlr ? cpu::GetCpuActlrEl1() : 0;
init_args->cpuectlr = needs_cpu_ctlr ? cpu::GetCpuEctlrEl1() : 0;
init_args->sp = 0;
init_args->entrypoint = reinterpret_cast<uintptr_t>(::ams::kern::board::nintendo::nx::KSleepManager::ResumeEntry);
init_args->argument = sleep_buffer;
}
/* Ensure that all cores get to this point before continuing. */
cpu::SynchronizeAllCores();
/* Log that the core is going to sleep. */
MESOSPHERE_LOG("Core[%d]: Going to sleep, buffer = %010lx\n", core_id, sleep_buffer);
/* If we're on a core other than zero, we can just invoke the sleep handler. */
if (core_id != 0) {
CpuSleepHandler(sleep_buffer, GetInteger(start_core_phys_addr), GetInteger(init_args_phys_addr));
} else {
/* Wait for all other cores to be powered off. */
WaitOtherCpuPowerOff();
/* If we're using the legacy lps driver, enable suspend. */
if (use_legacy_lps_driver) {
MESOSPHERE_R_ABORT_UNLESS(lps::EnableSuspend(true));
}
/* Log that we're about to enter SC7. */
MESOSPHERE_LOG("Entering SC7\n");
/* Save the debug log state. */
KDebugLog::Save();
/* Invoke the sleep handler. */
if (!use_legacy_lps_driver) {
/* When not using the legacy driver, invoke directly. */
CpuSleepHandler(sleep_buffer, GetInteger(start_core_phys_addr), GetInteger(init_args_phys_addr));
} else {
lps::InvokeCpuSleepHandler(sleep_buffer, GetInteger(start_core_phys_addr), GetInteger(init_args_phys_addr));
}
/* Restore the debug log state. */
KDebugLog::Restore();
/* Log that we're about to exit SC7. */
MESOSPHERE_LOG("Exiting SC7\n");
/* Wake up the other cores. */
cpu::MultiprocessorAffinityRegisterAccessor mpidr;
const auto arg = mpidr.GetCpuOnArgument();
for (s32 i = 1; i < static_cast<s32>(cpu::NumCores); ++i) {
KSystemControl::Init::TurnOnCpu(arg | i, g_sleep_init_arguments + i);
}
}
/* Log that the core is waking from sleep. */
MESOSPHERE_LOG("Core[%d]: Woke from sleep.\n", core_id);
/* Ensure that all cores get to this point before continuing. */
cpu::SynchronizeAllCores();
/* Restore the interrupt manager's state. */
Kernel::GetInterruptManager().Restore(core_id);
/* Ensure that all cores get to this point before continuing. */
cpu::SynchronizeAllCores();
/* If on core 0, wake up the device page tables. */
if (core_id == 0) {
KDevicePageTable::Wakeup();
/* If we're using the legacy driver, resume the bpmp firmware. */
if (use_legacy_lps_driver) {
lps::ResumeBpmpFirmware();
}
}
/* Ensure that all cores get to this point before continuing. */
cpu::SynchronizeAllCores();
/* Restore the system registers for the current core. */
g_sleep_system_registers[core_id].Restore();
}
/* Signal request completed. */
{
KScopedLightLock lk(g_cv_lock);
g_sleep_target_cores &= ~target_core_mask;
if (g_sleep_target_cores == 0) {
g_cv.Broadcast();
}
}
}
}
}
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