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kern: kill the interrupt task manager thread

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Michael Scire 2021-09-17 16:12:01 -07:00 • committed by SciresM
parent 29cc3d1c09
commit cb28150912
9 changed files with 112 additions and 140 deletions
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55
mesosphere/kernel/source/arch/arm64/kern_k_scheduler_asm.s
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@ -112,29 +112,16 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
/* KScheduler layout has state at +0x0, this is guaranteed statically by assembly offsets. */
mov x1, x0
/* First thing we want to do is check whether the interrupt task thread is runnable. */
ldrb w3, [x1, #(KSCHEDULER_INTERRUPT_TASK_THREAD_RUNNABLE)]
cbz w3, 0f
/* If it is, we want to call KScheduler::InterruptTaskThreadToRunnable() to change its state to runnable. */
stp x0, x1, [sp, #-16]!
stp x30, xzr, [sp, #-16]!
bl _ZN3ams4kern10KScheduler29InterruptTaskThreadToRunnableEv
ldp x30, xzr, [sp], 16
ldp x0, x1, [sp], 16
/* Clear the interrupt task thread as runnable. */
strb wzr, [x1, #(KSCHEDULER_INTERRUPT_TASK_THREAD_RUNNABLE)]
0: /* Interrupt task thread runnable checked. */
/* Now we want to check if there's any scheduling to do. */
/* First, clear the need's scheduling bool (and dmb ish after, as it's an atomic). */
/* TODO: Should this be a stlrb? Nintendo does not do one. */
strb wzr, [x1]
dmb ish
/* Check if the highest priority thread is the same as the current thread. */
/* Check whether there are runnable interrupt tasks. */
ldrb w8, [x1, #(KSCHEDULER_INTERRUPT_TASK_RUNNABLE)]
cbnz w8, 0f
/* If it isn't, we want to check if the highest priority thread is the same as the current thread. */
ldr x7, [x1, #(KSCHEDULER_HIGHEST_PRIORITY_THREAD)]
cmp x7, x18
b.ne 1f
@ -142,6 +129,10 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
/* If they're the same, then we can just return as there's nothing to do. */
ret
0: /* The interrupt task thread is runnable. */
/* We want to switch to the interrupt task/idle thread. */
mov x7, #0
1: /* The highest priority thread is not the same as the current thread. */
/* Get a reference to the current thread's stack parameters. */
add x2, sp, #0x1000
@ -271,12 +262,19 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
/* Call ams::kern::KScheduler::SwitchThread(ams::kern::KThread *) */
bl _ZN3ams4kern10KScheduler12SwitchThreadEPNS0_7KThreadE
12: /* We've switched to the idle thread, so we want to loop until we schedule a non-idle thread. */
/* Check if we need scheduling. */
ldarb w3, [x20] // ldarb w3, [x20, #(KSCHEDULER_NEEDS_SCHEDULING)]
12: /* We've switched to the idle thread, so we want to process interrupt tasks until we schedule a non-idle thread. */
/* Check whether there are runnable interrupt tasks. */
ldrb w3, [x20, #(KSCHEDULER_INTERRUPT_TASK_RUNNABLE)]
cbnz w3, 13f
/* If we don't, wait for an interrupt and check again. */
/* Check if we need scheduling. */
ldarb w3, [x20] // ldarb w3, [x20, #(KSCHEDULER_NEEDS_SCHEDULING)]
cbnz w3, 4b
/* Clear the previous thread. */
str xzr, [x20, #(KSCHEDULER_PREVIOUS_THREAD)]
/* Wait for an interrupt and check again. */
wfi
msr daifclr, #2
@ -284,16 +282,13 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
b 12b
13: /* We need scheduling again! */
/* Check whether the interrupt task thread needs to be set runnable. */
ldrb w3, [x20, #(KSCHEDULER_INTERRUPT_TASK_THREAD_RUNNABLE)]
cbz w3, 4b
/* It does, so do so. We're using the idle thread stack so no register state preserve needed. */
bl _ZN3ams4kern10KScheduler29InterruptTaskThreadToRunnableEv
13: /* We have interrupt tasks to execute! */
/* Execute any pending interrupt tasks. */
ldr x0, [x20, #(KSCHEDULER_INTERRUPT_TASK_MANAGER)]
bl _ZN3ams4kern21KInterruptTaskManager7DoTasksEv
/* Clear the interrupt task thread as runnable. */
strb wzr, [x20, #(KSCHEDULER_INTERRUPT_TASK_THREAD_RUNNABLE)]
strb wzr, [x20, #(KSCHEDULER_INTERRUPT_TASK_RUNNABLE)]
/* Retry the scheduling loop. */
b 4b