mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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96f95b9f95
* result: try out some experimental shenanigans * result: sketch out some more shenanigans * result: see what it looks like to convert kernel to use result conds instead of guards * make rest of kernel use experimental new macro-ing
278 lines
10 KiB
C++
278 lines
10 KiB
C++
/*
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* Copyright (c) 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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namespace ams::kern {
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namespace {
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ALWAYS_INLINE bool ReadFromUser(s32 *out, KProcessAddress address) {
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return UserspaceAccess::CopyMemoryFromUserSize32Bit(out, GetVoidPointer(address));
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}
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ALWAYS_INLINE bool DecrementIfLessThan(s32 *out, KProcessAddress address, s32 value) {
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KScopedInterruptDisable di;
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if (!cpu::CanAccessAtomic(address)) {
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return false;
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}
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return UserspaceAccess::DecrementIfLessThanAtomic(out, GetPointer<s32>(address), value);
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}
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ALWAYS_INLINE bool UpdateIfEqual(s32 *out, KProcessAddress address, s32 value, s32 new_value) {
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KScopedInterruptDisable di;
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if (!cpu::CanAccessAtomic(address)) {
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return false;
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}
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return UserspaceAccess::UpdateIfEqualAtomic(out, GetPointer<s32>(address), value, new_value);
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}
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class ThreadQueueImplForKAddressArbiter final : public KThreadQueue {
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private:
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KAddressArbiter::ThreadTree *m_tree;
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public:
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constexpr ThreadQueueImplForKAddressArbiter(KAddressArbiter::ThreadTree *t) : KThreadQueue(), m_tree(t) { /* ... */ }
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virtual void CancelWait(KThread *waiting_thread, Result wait_result, bool cancel_timer_task) override {
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/* If the thread is waiting on an address arbiter, remove it from the tree. */
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if (waiting_thread->IsWaitingForAddressArbiter()) {
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m_tree->erase(m_tree->iterator_to(*waiting_thread));
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waiting_thread->ClearAddressArbiter();
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}
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/* Invoke the base cancel wait handler. */
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KThreadQueue::CancelWait(waiting_thread, wait_result, cancel_timer_task);
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}
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};
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}
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Result KAddressArbiter::Signal(uintptr_t addr, s32 count) {
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/* Perform signaling. */
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s32 num_waiters = 0;
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{
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KScopedSchedulerLock sl;
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auto it = m_tree.nfind_key({ addr, -1 });
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while ((it != m_tree.end()) && (count <= 0 || num_waiters < count) && (it->GetAddressArbiterKey() == addr)) {
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/* End the thread's wait. */
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KThread *target_thread = std::addressof(*it);
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target_thread->EndWait(ResultSuccess());
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MESOSPHERE_ASSERT(target_thread->IsWaitingForAddressArbiter());
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target_thread->ClearAddressArbiter();
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it = m_tree.erase(it);
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++num_waiters;
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}
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}
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R_SUCCEED();
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}
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Result KAddressArbiter::SignalAndIncrementIfEqual(uintptr_t addr, s32 value, s32 count) {
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/* Perform signaling. */
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s32 num_waiters = 0;
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{
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KScopedSchedulerLock sl;
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/* Check the userspace value. */
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s32 user_value;
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R_UNLESS(UpdateIfEqual(std::addressof(user_value), addr, value, value + 1), svc::ResultInvalidCurrentMemory());
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R_UNLESS(user_value == value, svc::ResultInvalidState());
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auto it = m_tree.nfind_key({ addr, -1 });
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while ((it != m_tree.end()) && (count <= 0 || num_waiters < count) && (it->GetAddressArbiterKey() == addr)) {
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/* End the thread's wait. */
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KThread *target_thread = std::addressof(*it);
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target_thread->EndWait(ResultSuccess());
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MESOSPHERE_ASSERT(target_thread->IsWaitingForAddressArbiter());
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target_thread->ClearAddressArbiter();
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it = m_tree.erase(it);
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++num_waiters;
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}
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}
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R_SUCCEED();
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}
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Result KAddressArbiter::SignalAndModifyByWaitingCountIfEqual(uintptr_t addr, s32 value, s32 count) {
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/* Perform signaling. */
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s32 num_waiters = 0;
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{
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KScopedSchedulerLock sl;
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auto it = m_tree.nfind_key({ addr, -1 });
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/* Determine the updated value. */
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s32 new_value;
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if (count <= 0) {
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if ((it != m_tree.end()) && (it->GetAddressArbiterKey() == addr)) {
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new_value = value - 2;
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} else {
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new_value = value + 1;
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}
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} else {
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if ((it != m_tree.end()) && (it->GetAddressArbiterKey() == addr)) {
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auto tmp_it = it;
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s32 tmp_num_waiters = 0;
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while ((++tmp_it != m_tree.end()) && (tmp_it->GetAddressArbiterKey() == addr)) {
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if ((tmp_num_waiters++) >= count) {
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break;
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}
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}
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if (tmp_num_waiters < count) {
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new_value = value - 1;
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} else {
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new_value = value;
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}
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} else {
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new_value = value + 1;
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}
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}
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/* Check the userspace value. */
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s32 user_value;
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bool succeeded;
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if (value != new_value) {
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succeeded = UpdateIfEqual(std::addressof(user_value), addr, value, new_value);
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} else {
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succeeded = ReadFromUser(std::addressof(user_value), addr);
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}
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R_UNLESS(succeeded, svc::ResultInvalidCurrentMemory());
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R_UNLESS(user_value == value, svc::ResultInvalidState());
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while ((it != m_tree.end()) && (count <= 0 || num_waiters < count) && (it->GetAddressArbiterKey() == addr)) {
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/* End the thread's wait. */
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KThread *target_thread = std::addressof(*it);
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target_thread->EndWait(ResultSuccess());
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MESOSPHERE_ASSERT(target_thread->IsWaitingForAddressArbiter());
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target_thread->ClearAddressArbiter();
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it = m_tree.erase(it);
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++num_waiters;
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}
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}
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R_SUCCEED();
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}
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Result KAddressArbiter::WaitIfLessThan(uintptr_t addr, s32 value, bool decrement, s64 timeout) {
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/* Prepare to wait. */
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KThread *cur_thread = GetCurrentThreadPointer();
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KHardwareTimer *timer;
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ThreadQueueImplForKAddressArbiter wait_queue(std::addressof(m_tree));
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{
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KScopedSchedulerLockAndSleep slp(std::addressof(timer), cur_thread, timeout);
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/* Check that the thread isn't terminating. */
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if (cur_thread->IsTerminationRequested()) {
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slp.CancelSleep();
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R_THROW(svc::ResultTerminationRequested());
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}
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/* Read the value from userspace. */
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s32 user_value;
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bool succeeded;
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if (decrement) {
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succeeded = DecrementIfLessThan(std::addressof(user_value), addr, value);
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} else {
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succeeded = ReadFromUser(std::addressof(user_value), addr);
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}
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if (!succeeded) {
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slp.CancelSleep();
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R_THROW(svc::ResultInvalidCurrentMemory());
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}
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/* Check that the value is less than the specified one. */
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if (user_value >= value) {
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slp.CancelSleep();
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R_THROW(svc::ResultInvalidState());
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}
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/* Check that the timeout is non-zero. */
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if (timeout == 0) {
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slp.CancelSleep();
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R_THROW(svc::ResultTimedOut());
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}
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/* Set the arbiter. */
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cur_thread->SetAddressArbiter(std::addressof(m_tree), addr);
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m_tree.insert(*cur_thread);
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/* Wait for the thread to finish. */
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wait_queue.SetHardwareTimer(timer);
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cur_thread->BeginWait(std::addressof(wait_queue));
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}
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/* Get the wait result. */
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R_RETURN(cur_thread->GetWaitResult());
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}
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Result KAddressArbiter::WaitIfEqual(uintptr_t addr, s32 value, s64 timeout) {
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/* Prepare to wait. */
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KThread *cur_thread = GetCurrentThreadPointer();
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KHardwareTimer *timer;
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ThreadQueueImplForKAddressArbiter wait_queue(std::addressof(m_tree));
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{
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KScopedSchedulerLockAndSleep slp(std::addressof(timer), cur_thread, timeout);
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/* Check that the thread isn't terminating. */
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if (cur_thread->IsTerminationRequested()) {
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slp.CancelSleep();
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R_THROW(svc::ResultTerminationRequested());
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}
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/* Read the value from userspace. */
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s32 user_value;
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if (!ReadFromUser(std::addressof(user_value), addr)) {
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slp.CancelSleep();
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R_THROW(svc::ResultInvalidCurrentMemory());
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}
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/* Check that the value is equal. */
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if (value != user_value) {
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slp.CancelSleep();
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R_THROW(svc::ResultInvalidState());
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}
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/* Check that the timeout is non-zero. */
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if (timeout == 0) {
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slp.CancelSleep();
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R_THROW(svc::ResultTimedOut());
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}
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/* Set the arbiter. */
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cur_thread->SetAddressArbiter(std::addressof(m_tree), addr);
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m_tree.insert(*cur_thread);
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/* Wait for the thread to finish. */
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wait_queue.SetHardwareTimer(timer);
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cur_thread->BeginWait(std::addressof(wait_queue));
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}
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/* Get the wait result. */
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R_RETURN(cur_thread->GetWaitResult());
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}
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}
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