#include <cputypes.h>
#include <cpus.h>
#include <platforms.h>
-#include <task_swapper.h>
#include <kern/ast.h>
#include <kern/counters.h>
#include <kern/cpu_number.h>
#include <kern/misc_protos.h>
#include <kern/queue.h>
-#include <kern/sched.h>
#include <kern/sched_prim.h>
#include <kern/thread.h>
#include <kern/thread_act.h>
#include <kern/processor.h>
#include <kern/spl.h>
#include <mach/policy.h>
-#if TASK_SWAPPER
-#include <kern/task_swap.h>
-#endif /* TASK_SWAPPER */
volatile ast_t need_ast[NCPUS];
#endif /* MACHINE_AST */
}
+/*
+ * Called at splsched.
+ */
void
ast_taken(
- boolean_t preemption,
- ast_t mask,
- boolean_t interrupt
+ ast_t reasons,
+ boolean_t enable
)
{
- register thread_t self = current_thread();
- register processor_t mypr;
- register ast_t reasons;
- register int mycpu;
- thread_act_t act = self->top_act;
-#ifdef MACH_BSD
- extern void bsd_ast(thread_act_t);
- extern void bsdinit_task(void);
-#endif
+ register thread_t self = current_thread();
+ register int mycpu = cpu_number();
+ boolean_t preempt_trap = (reasons == AST_PREEMPTION);
- mp_disable_preemption();
- mycpu = cpu_number();
- reasons = need_ast[mycpu] & mask;
+ reasons &= need_ast[mycpu];
need_ast[mycpu] &= ~reasons;
- mp_enable_preemption();
-
- ml_set_interrupts_enabled(interrupt);
/*
- * No ast for an idle thread
+ * Handle ASTs for all threads
+ * except idle processor threads.
*/
- if (self->state & TH_IDLE)
- return;
-
- /*
- * Check for preemption
- */
- if ((reasons & AST_URGENT) && (wait_queue_assert_possible(self))) {
- reasons &= ~AST_URGENT;
- if ((reasons & (AST_BLOCK|AST_QUANTUM)) == 0) {
- mp_disable_preemption();
- mypr = current_processor();
- if (csw_needed(self, mypr)) {
- reasons |= (mypr->first_quantum ? AST_BLOCK : AST_QUANTUM);
+ if (!(self->state & TH_IDLE)) {
+ /*
+ * Check for urgent preemption.
+ */
+ if ( (reasons & AST_URGENT) &&
+ wait_queue_assert_possible(self) ) {
+ if (reasons & AST_PREEMPT) {
+ counter(c_ast_taken_block++);
+ thread_block_reason(THREAD_CONTINUE_NULL,
+ AST_PREEMPT | AST_URGENT);
}
- mp_enable_preemption();
- }
- if (reasons & (AST_BLOCK | AST_QUANTUM)) {
- counter(c_ast_taken_block++);
- thread_block_reason((void (*)(void))0,
- (reasons & (AST_BLOCK | AST_QUANTUM)));
+
+ reasons &= ~AST_PREEMPTION;
}
- if (reasons == 0)
- return;
- }
+
+ /*
+ * The kernel preempt traps
+ * skip all other ASTs.
+ */
+ if (!preempt_trap) {
+ ml_set_interrupts_enabled(enable);
#ifdef MACH_BSD
- /*
- * Check for BSD hardcoded hooks
- */
- if (reasons & AST_BSD) {
- thread_ast_clear(act,AST_BSD);
- bsd_ast(act);
- }
- if (reasons & AST_BSD_INIT) {
- thread_ast_clear(act,AST_BSD_INIT);
- bsdinit_task();
- }
+ /*
+ * Handle BSD hook.
+ */
+ if (reasons & AST_BSD) {
+ extern void bsd_ast(thread_act_t act);
+ thread_act_t act = self->top_act;
+
+ thread_ast_clear(act, AST_BSD);
+ bsd_ast(act);
+ }
#endif
-#if TASK_SWAPPER
- /* must be before AST_APC */
- if (reasons & AST_SWAPOUT) {
- spl_t s;
- swapout_ast();
- s = splsched();
- mp_disable_preemption();
- mycpu = cpu_number();
- if (need_ast[mycpu] & AST_APC) {
- /* generated in swapout_ast() to get suspended */
- reasons |= AST_APC; /* process now ... */
- need_ast[mycpu] &= ~AST_APC; /* ... and not later */
- }
- mp_enable_preemption();
- splx(s);
- }
-#endif /* TASK_SWAPPER */
+ /*
+ * Thread APC hook.
+ */
+ if (reasons & AST_APC)
+ act_execute_returnhandlers();
- /*
- * migration APC hook
- */
- if (reasons & AST_APC) {
- act_execute_returnhandlers();
- }
+ ml_set_interrupts_enabled(FALSE);
- /*
- * thread_block needs to know if the thread's quantum
- * expired so the thread can be put on the tail of
- * run queue. One of the previous actions might well
- * have woken a high-priority thread, so we also use
- * csw_needed check.
- */
- reasons &= (AST_BLOCK | AST_QUANTUM);
- if (reasons == 0) {
- mp_disable_preemption();
- mypr = current_processor();
- if (csw_needed(self, mypr)) {
- reasons = (mypr->first_quantum ? AST_BLOCK : AST_QUANTUM);
+ /*
+ * Check for preemption.
+ */
+ if (reasons & AST_PREEMPT) {
+ processor_t myprocessor = current_processor();
+
+ if (csw_needed(self, myprocessor))
+ reasons = AST_PREEMPT;
+ else
+ reasons = AST_NONE;
+ }
+ if ( (reasons & AST_PREEMPT) &&
+ wait_queue_assert_possible(self) ) {
+ counter(c_ast_taken_block++);
+ thread_block_reason(thread_exception_return, AST_PREEMPT);
+ }
}
- mp_enable_preemption();
- }
- if ((reasons & (AST_BLOCK | AST_QUANTUM)) &&
- (wait_queue_assert_possible(self))) {
- counter(c_ast_taken_block++);
- /*
- * JMM - SMP machines don't like blocking at a continuation
- * here - why not? Could be a combination of set_state and
- * suspension on the thread_create_running API?
- *
- * thread_block_reason(thread_exception_return, reasons);
- */
- thread_block_reason((void (*)(void))0, reasons);
}
+
+ ml_set_interrupts_enabled(enable);
}
+/*
+ * Called at splsched.
+ */
void
-ast_check(void)
+ast_check(
+ processor_t processor)
{
- register int mycpu;
- register processor_t myprocessor;
- register thread_t thread = current_thread();
- spl_t s = splsched();
+ register thread_t self = processor->active_thread;
- mp_disable_preemption();
- mycpu = cpu_number();
+ processor->current_pri = self->sched_pri;
+ if (processor->state == PROCESSOR_RUNNING) {
+ register ast_t preempt;
+processor_running:
- /*
- * Check processor state for ast conditions.
- */
- myprocessor = cpu_to_processor(mycpu);
- switch(myprocessor->state) {
- case PROCESSOR_OFF_LINE:
- case PROCESSOR_IDLE:
- case PROCESSOR_DISPATCHING:
/*
- * No ast.
+ * Propagate thread ast to processor.
*/
- break;
-
-#if NCPUS > 1
- case PROCESSOR_ASSIGN:
- /*
- * Need ast to force action thread onto processor.
- *
- * XXX Should check if action thread is already there.
- */
- ast_on(AST_BLOCK);
- break;
-#endif /* NCPUS > 1 */
-
- case PROCESSOR_RUNNING:
- case PROCESSOR_SHUTDOWN:
- /*
- * Propagate thread ast to processor. If we already
- * need an ast, don't look for more reasons.
- */
- ast_propagate(current_act()->ast);
- if (ast_needed(mycpu))
- break;
+ ast_propagate(self->top_act->ast);
/*
* Context switch check.
*/
- if (csw_needed(thread, myprocessor)) {
- ast_on((myprocessor->first_quantum ?
- AST_BLOCK : AST_QUANTUM));
- }
- break;
-
- default:
- panic("ast_check: Bad processor state");
+ if ((preempt = csw_check(self, processor)) != AST_NONE)
+ ast_on(preempt);
}
- mp_enable_preemption();
- splx(s);
-}
-
-/*
- * JMM - Temporary exports to other components
- */
-#undef ast_on
-#undef ast_off
-
-void
-ast_on(ast_t reason)
-{
- boolean_t intr;
-
- intr = ml_set_interrupts_enabled(FALSE);
- ast_on_fast(reason);
- (void *)ml_set_interrupts_enabled(intr);
-}
-
-void
-ast_off(ast_t reason)
-{
- ast_off_fast(reason);
+ else
+ if ( processor->state == PROCESSOR_DISPATCHING ||
+ processor->state == PROCESSOR_IDLE ) {
+ return;
+ }
+ else
+ if (processor->state == PROCESSOR_SHUTDOWN)
+ goto processor_running;
}
projects / apple / xnu.git / blobdiff