Changeset 29029ac0 in mainline

Timestamp:

2024-01-18T16:31:40Z (11 months ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master

Children:

1c1767f

Parents:

ed7e057

Message:

Call after_thread_ran_arch() before context switch

This is only used on sparc, and requires an additional window flush
before the register is sampled. Doing it this way allows switching
from one thread to another without the intermediary step of
a special scheduler context.

Location:

kernel

Files:

• arch/sparc64/src/proc/sun4u/scheduler.c (modified) (1 diff)
• arch/sparc64/src/proc/sun4v/scheduler.c (modified) (1 diff)
• generic/src/proc/scheduler.c (modified) (2 diffs)

kernel/arch/sparc64/src/proc/sun4u/scheduler.c

@@ -76 +76 @@
 {
         if (THREAD->uspace) {
+                asm volatile ("flushw");
+
                 /* sample the state of the userspace window buffer */
                 THREAD->arch.uspace_window_buffer =

kernel/arch/sparc64/src/proc/sun4v/scheduler.c

@@ -68 +68 @@
 {
         if (THREAD->uspace) {
+                asm volatile ("flushw");
+
                 /* sample the state of the userspace window buffer */
                 THREAD->arch.uspace_window_buffer =

kernel/generic/src/proc/scheduler.c

@@ -443 +443 @@
         THREAD->kcycles += get_cycle() - THREAD->last_cycle;
 
+        /*
+         * On Sparc, this saves some extra userspace state that's not
+         * covered by context_save()/context_restore().
+         */
+        after_thread_ran_arch();
+
         if (new_state == Sleeping) {
                 /* Prefer the thread after it's woken up. */
@@ -499 +505 @@
 
         if (THREAD) {
-                /*
-                 * On Sparc, this saves some extra userspace state that's not
-                 * covered by context_save()/context_restore().
-                 */
-                after_thread_ran_arch();
-
                 state_t state = THREAD->state;
                 irq_spinlock_unlock(&THREAD->lock, false);