X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/de355530ae67247cbd0da700edb3a2a1dae884c2..39236c6e673c41db228275375ab7fdb0f837b292:/osfmk/kern/ast.c

diff --git a/osfmk/kern/ast.c b/osfmk/kern/ast.c
index 848c13caf..ee197f7f6 100644
--- a/osfmk/kern/ast.c
+++ b/osfmk/kern/ast.c
@@ -1,23 +1,29 @@
 /*
- * 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@
@@ -60,7 +66,6 @@
  */
 
 #include <cputypes.h>
-#include <cpus.h>
 #include <platforms.h>
 
 #include <kern/ast.h>
@@ -70,112 +75,155 @@
 #include <kern/queue.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>
+#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(
-	ast_t			reasons,
-	boolean_t		enable
+	ast_t		reasons,
+	boolean_t	enable
 )
 {
-	register int			mycpu;
-	register processor_t	myprocessor;
-	register thread_t		self = current_thread();
-	boolean_t				preempt_trap = (reasons == AST_PREEMPT);
-
-	disable_preemption();
-	mycpu = cpu_number();
-	reasons &= need_ast[mycpu];
-	need_ast[mycpu] &= ~reasons;
-	enable_preemption();
+	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)
-		goto enable_and_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 urgent preemption
+	 * Handle ASTs for all threads
+	 * except idle processor threads.
 	 */
-	if ((reasons & AST_URGENT) && wait_queue_assert_possible(self)) {
-		if (reasons & AST_BLOCK) {
-			counter(c_ast_taken_block++);
-			thread_block_reason((void (*)(void))0, AST_BLOCK);
+	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);
+			}
+
+			reasons &= ~AST_PREEMPTION;
 		}
 
-		reasons &= ~AST_PREEMPT;
-		if (reasons == 0)
-			goto enable_and_return;
-	}
+		/*
+		 * The kernel preempt traps
+		 * skip all other ASTs.
+		 */
+		if (!preempt_trap) {
+			ml_set_interrupts_enabled(enable);
 
-	if (preempt_trap)
-		goto enable_and_return;
+#ifdef	MACH_BSD
+			/*
+			 * 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);
+			}
 
-	ml_set_interrupts_enabled(enable);
+			/*
+			 * Kernel Profiling Hook
+			 */
+			if (reasons & AST_KPERF) {
+				thread_ast_clear(thread, AST_KPERF);
+				chudxnu_thread_ast(thread);
+			}
 
-#ifdef	MACH_BSD
-	/*
-	 * Check for BSD hook
-	 */
-	if (reasons & AST_BSD) {
-		extern void		bsd_ast(thread_act_t	act);
-		thread_act_t	act = self->top_act;
+#if CONFIG_TELEMETRY
+			if (reasons & AST_TELEMETRY_ALL) {
+				boolean_t interrupted_userspace;
 
-		thread_ast_clear(act, AST_BSD);
-		bsd_ast(act);
-	}
+				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
 
-	/* 
-	 * migration APC hook 
-	 */
-	if (reasons & AST_APC) {
-		act_execute_returnhandlers();
-	}
-
-	/* 
-	 * Check for normal preemption
-	 */
-	reasons &= AST_BLOCK;
-    if (reasons == 0) {
-        disable_preemption();
-        myprocessor = current_processor();
-        if (csw_needed(self, myprocessor))
-            reasons = AST_BLOCK;
-        enable_preemption();
-    }
-	if (	(reasons & AST_BLOCK)				&&
-			wait_queue_assert_possible(self)		) {		
-		counter(c_ast_taken_block++);
-		thread_block_reason(thread_exception_return, AST_BLOCK);
-	}
+			ml_set_interrupts_enabled(FALSE);
 
-	goto just_return;
+			/* 
+			 * Check for preemption.
+			 */
+			if (reasons & AST_PREEMPT)
+				reasons = csw_check(current_processor());
 
-enable_and_return:
-    ml_set_interrupts_enabled(enable);
+			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);
+			}
+		}
+	}
 
-just_return:
-	return;
+	ml_set_interrupts_enabled(enable);
 }
 
 /*
@@ -185,33 +233,25 @@ void
 ast_check(
 	processor_t		processor)
 {
-	register thread_t		self = processor->cpu_data->active_thread;
+	thread_t			thread = processor->active_thread;
 
-	processor->current_pri = self->sched_pri;
-	if (processor->state == PROCESSOR_RUNNING) {
-		register ast_t		preempt;
-processor_running:
+	processor->current_pri = thread->sched_pri;
+	processor->current_thmode = thread->sched_mode;
+	if (	processor->state == PROCESSOR_RUNNING		||
+			processor->state == PROCESSOR_SHUTDOWN		) {
+		ast_t			preempt;
 
 		/*
 		 *	Propagate thread ast to processor.
 		 */
-		ast_propagate(self->top_act->ast);
+		pal_ast_check(thread);
+
+		ast_propagate(thread->ast);
 
 		/*
 		 *	Context switch check.
 		 */
-		if ((preempt = csw_check(self, processor)) != AST_NONE)
+		if ((preempt = csw_check(processor)) != AST_NONE)
 			ast_on(preempt);
 	}
-	else
-	if (	processor->state == PROCESSOR_DISPATCHING	||
-			processor->state == PROCESSOR_IDLE			) {
-		return;
-	}
-	else
-	if (processor->state == PROCESSOR_SHUTDOWN)
-		goto processor_running;
-	else
-	if (processor->state == PROCESSOR_ASSIGN)
-		ast_on(AST_BLOCK);
 }