WebSVN – HelenOS – Diff – /trunk/kernel/arch/ia32/src/proc/scheduler.c


/*
 * Copyright (c) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup ia32proc
 * @{
 */
/** @file
 */
 
#include <proc/scheduler.h>
#include <cpu.h>
#include <proc/task.h>
#include <proc/thread.h>
#include <arch.h>
#include <arch/context.h>   /* SP_DELTA */
#include <arch/debugger.h>
#include <arch/pm.h>
#include <arch/asm.h>
#include <arch/ddi/ddi.h>
 
/** Perform ia32 specific tasks needed before the new task is run.
 *
 * Interrupts are disabled.
 */
void before_task_runs_arch(void)
{
    io_perm_bitmap_install();
}
 
/** Perform ia32 specific tasks needed before the new thread is scheduled.
 *
 * THREAD is locked and interrupts are disabled.
 */
void before_thread_runs_arch(void)
{
    uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
        SP_DELTA];
 
    /* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */
    write_msr(IA32_MSR_SYSENTER_ESP, kstk);
 
    /* Set kernel stack for CPL3 -> CPL0 switch via interrupt */
    CPU->arch.tss->esp0 = kstk;
    CPU->arch.tss->ss0 = selector(KDATA_DES);
 
    /* Set up TLS in GS register */
    set_tls_desc(THREAD->arch.tls);
 
#ifdef CONFIG_DEBUG_AS_WATCHPOINT
    /* Set watchpoint on AS to ensure that nobody sets it to zero */
    if (CPU->id < BKPOINTS_MAX) {
        the_t *the = THE;
        breakpoint_add(&((the_t *) the->thread->kstack)->as,
            BKPOINT_WRITE | BKPOINT_CHECK_ZERO, the->cpu->id);
    }
#endif
}
 
void after_thread_ran_arch(void)
{
}
 
/** @}
 */
 

Rev 2630	Rev 3485
1	/*	1	/*
2	* Copyright (c) 2005 Jakub Jermar	2	* Copyright (c) 2005 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup ia32proc	29	/** @addtogroup ia32proc
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <proc/scheduler.h>	35	#include <proc/scheduler.h>
36	#include <cpu.h>	36	#include <cpu.h>
37	#include <proc/task.h>	37	#include <proc/task.h>
38	#include <proc/thread.h>	38	#include <proc/thread.h>
39	#include <arch.h>	39	#include <arch.h>
40	#include <arch/context.h> /* SP_DELTA */	40	#include <arch/context.h> /* SP_DELTA */
41	#include <arch/debugger.h>	41	#include <arch/debugger.h>
42	#include <arch/pm.h>	42	#include <arch/pm.h>
43	#include <arch/asm.h>	43	#include <arch/asm.h>
44	#include <arch/ddi/ddi.h>	44	#include <arch/ddi/ddi.h>
45		45
46	/** Perform ia32 specific tasks needed before the new task is run.	46	/** Perform ia32 specific tasks needed before the new task is run.
47	*	47	*
48	* Interrupts are disabled.	48	* Interrupts are disabled.
49	*/	49	*/
50	void before_task_runs_arch(void)	50	void before_task_runs_arch(void)
51	{	51	{
52	io_perm_bitmap_install();	52	io_perm_bitmap_install();
53	}	53	}
54		54
55	/** Perform ia32 specific tasks needed before the new thread is scheduled.	55	/** Perform ia32 specific tasks needed before the new thread is scheduled.
56	*	56	*
57	* THREAD is locked and interrupts are disabled.	57	* THREAD is locked and interrupts are disabled.
58	*/	58	*/
59	void before_thread_runs_arch(void)	59	void before_thread_runs_arch(void)
60	{	60	{
61	CPU->arch.tss->esp0 = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -	61	uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
62	SP_DELTA];	62	SP_DELTA];
-		63
-		64	/* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */
-		65	write_msr(IA32_MSR_SYSENTER_ESP, kstk);
-		66
-		67	/* Set kernel stack for CPL3 -> CPL0 switch via interrupt */
-		68	CPU->arch.tss->esp0 = kstk;
63	CPU->arch.tss->ss0 = selector(KDATA_DES);	69	CPU->arch.tss->ss0 = selector(KDATA_DES);
64		70
65	/* Set up TLS in GS register */	71	/* Set up TLS in GS register */
66	set_tls_desc(THREAD->arch.tls);	72	set_tls_desc(THREAD->arch.tls);
67		73
68	#ifdef CONFIG_DEBUG_AS_WATCHPOINT	74	#ifdef CONFIG_DEBUG_AS_WATCHPOINT
69	/* Set watchpoint on AS to ensure that nobody sets it to zero */	75	/* Set watchpoint on AS to ensure that nobody sets it to zero */
70	if (CPU->id < BKPOINTS_MAX) {	76	if (CPU->id < BKPOINTS_MAX) {
71	the_t *the = THE;	77	the_t *the = THE;
72	breakpoint_add(&((the_t *) the->thread->kstack)->as,	78	breakpoint_add(&((the_t *) the->thread->kstack)->as,
73	BKPOINT_WRITE \| BKPOINT_CHECK_ZERO, the->cpu->id);	79	BKPOINT_WRITE \| BKPOINT_CHECK_ZERO, the->cpu->id);
74	}	80	}
75	#endif	81	#endif
76	}	82	}
77		83
78	void after_thread_ran_arch(void)	84	void after_thread_ran_arch(void)
79	{	85	{
80	}	86	}
81		87
82	/** @}	88	/** @}
83	*/	89	*/
84		90

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/src/proc/scheduler.c – Rev 2630 → 3485