/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
*/
#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/thread_swap.h>
#include <kern/processor.h>
#include <kern/spl.h>
+#if CONFIG_TELEMETRY
+#include <kern/telemetry.h>
+#endif
+#include <kern/wait_queue.h>
+#include <kern/ledger.h>
#include <mach/policy.h>
-#if TASK_SWAPPER
-#include <kern/task_swap.h>
-#endif /* TASK_SWAPPER */
+#include <machine/trap.h> // for CHUD AST hook
+#include <machine/pal_routines.h>
+#include <security/mac_mach_internal.h> // for MACF AST hook
+
+volatile perfASTCallback perfASTHook;
-volatile ast_t need_ast[NCPUS];
void
ast_init(void)
{
-#ifndef MACHINE_AST
- register int i;
-
- for (i=0; i<NCPUS; i++) {
- need_ast[i] = AST_NONE;
- }
-#endif /* MACHINE_AST */
}
+extern void chudxnu_thread_ast(thread_t); // XXX this should probably be in a header...
+
+/*
+ * 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
-
- mp_disable_preemption();
- mycpu = cpu_number();
- reasons = need_ast[mycpu] & mask;
- need_ast[mycpu] &= ~reasons;
- mp_enable_preemption();
-
- ml_set_interrupts_enabled(interrupt);
+ boolean_t preempt_trap = (reasons == AST_PREEMPTION);
+ ast_t *myast = ast_pending();
+ thread_t thread = current_thread();
+ perfASTCallback perf_hook = perfASTHook;
/*
- * No ast for an idle thread
+ * CHUD hook - all threads including idle processor threads
*/
- if (self->state & TH_IDLE)
- return;
+ if (perf_hook) {
+ if (*myast & AST_CHUD_ALL) {
+ (*perf_hook)(reasons, myast);
+
+ if (*myast == AST_NONE)
+ return;
+ }
+ }
+ else
+ *myast &= ~AST_CHUD_ALL;
+
+ reasons &= *myast;
+ *myast &= ~reasons;
/*
- * Check for preemption
+ * Handle ASTs for all threads
+ * except idle processor threads.
*/
- 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 (!(thread->state & TH_IDLE)) {
+ /*
+ * Check for urgent preemption.
+ */
+ if ( (reasons & AST_URGENT) &&
+ wait_queue_assert_possible(thread) ) {
+ if (reasons & AST_PREEMPT) {
+ counter(c_ast_taken_block++);
+ thread_block_reason(THREAD_CONTINUE_NULL, 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) {
+ thread_ast_clear(thread, AST_BSD);
+ bsd_ast(thread);
+ }
+#endif
+#if CONFIG_MACF
+ /*
+ * Handle MACF hook.
+ */
+ if (reasons & AST_MACF) {
+ thread_ast_clear(thread, AST_MACF);
+ mac_thread_userret(thread);
+ }
#endif
+ /*
+ * Thread APC hook.
+ */
+ if (reasons & AST_APC)
+ act_execute_returnhandlers();
+
+ if (reasons & AST_GUARD) {
+ thread_ast_clear(thread, AST_GUARD);
+ guard_ast(thread);
+ }
+
+ if (reasons & AST_LEDGER) {
+ thread_ast_clear(thread, AST_LEDGER);
+ ledger_ast(thread);
+ }
-#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 */
+ /*
+ * Kernel Profiling Hook
+ */
+ if (reasons & AST_KPERF) {
+ thread_ast_clear(thread, AST_KPERF);
+ chudxnu_thread_ast(thread);
+ }
- /*
- * migration APC hook
- */
- if (reasons & AST_APC) {
- act_execute_returnhandlers();
- }
+#if CONFIG_TELEMETRY
+ if (reasons & AST_TELEMETRY_ALL) {
+ boolean_t interrupted_userspace;
- /*
- * 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);
+ assert((reasons & AST_TELEMETRY_ALL) != AST_TELEMETRY_ALL); /* only one is valid at a time */
+ interrupted_userspace = (reasons & AST_TELEMETRY_USER) ? TRUE : FALSE;
+ thread_ast_clear(thread, AST_TELEMETRY_ALL);
+ telemetry_ast(thread, interrupted_userspace);
+ }
+#endif
+
+ ml_set_interrupts_enabled(FALSE);
+
+ /*
+ * Check for preemption.
+ */
+ if (reasons & AST_PREEMPT)
+ reasons = csw_check(current_processor());
+
+ if ( (reasons & AST_PREEMPT) &&
+ wait_queue_assert_possible(thread) ) {
+ counter(c_ast_taken_block++);
+ thread_block_reason((thread_continue_t)thread_exception_return, NULL, 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();
+ thread_t thread = processor->active_thread;
- mp_disable_preemption();
- mycpu = cpu_number();
+ processor->current_pri = thread->sched_pri;
+ processor->current_thmode = thread->sched_mode;
+ if ( processor->state == PROCESSOR_RUNNING ||
+ processor->state == PROCESSOR_SHUTDOWN ) {
+ ast_t preempt;
- /*
- * 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;
+ pal_ast_check(thread);
-#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(thread->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(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);
}
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