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kern: audit (and fix) our hardware maintenance instructions to match official kernel

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This commit is contained in:
Michael Scire
2021-10-27 12:31:53 -07:00
parent fb59d0ad43
commit e81a1ce5a8
16 changed files with 104 additions and 203 deletions
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22
libraries/libmesosphere/source/kern_k_scheduler.cpp
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@@ -79,13 +79,6 @@ namespace ams::kern {
RescheduleCurrentCore();
}
void KScheduler::RescheduleOtherCores(u64 cores_needing_scheduling) {
if (const u64 core_mask = cores_needing_scheduling & ~(1ul << m_core_id); core_mask != 0) {
cpu::DataSynchronizationBarrier();
Kernel::GetInterruptManager().SendInterProcessorInterrupt(KInterruptName_Scheduler, core_mask);
}
}
u64 KScheduler::UpdateHighestPriorityThread(KThread *highest_thread) {
if (KThread *prev_highest_thread = m_state.highest_priority_thread; AMS_LIKELY(prev_highest_thread != highest_thread)) {
if (AMS_LIKELY(prev_highest_thread != nullptr)) {
@@ -254,9 +247,24 @@ namespace ams::kern {
MESOSPHERE_KTRACE_THREAD_SWITCH(next_thread);
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
/* Ensure the single-step bit in mdscr reflects the correct single-step state for the new thread. */
cpu::MonitorDebugSystemControlRegisterAccessor().SetSoftwareStep(next_thread->IsSingleStep()).Store();
#endif
/* Switch the current process, if we're switching processes. */
if (KProcess *next_process = next_thread->GetOwnerProcess(); next_process != cur_process) {
KProcess::Switch(cur_process, next_process);
} else {
/* The single-step bit set up above requires an instruction synchronization barrier, to ensure */
/* the state change takes before we actually perform a return which might break-to-step. */
/* KProcess::Switch performs an isb incidentally, and so when we're changing process we */
/* can piggy-back off of that isb to avoid unnecessarily emptying the pipeline twice. */
/* However, this means that when we're switching to thread in a different process, */
/* we must ensure that we still isb. In practice, gcc will deduplicate into a single isb. */
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
cpu::InstructionMemoryBarrier();
#endif
}
/* Set the new thread. */