WebSVN – HelenOS – Diff – /branches/dynload/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/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 = gdtselector(KDATA_DES);
   
    /* Set up TLS in GS register */
    set_tls_desc(THREAD->arch.tls);
}
 
void after_thread_ran_arch(void)
{
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/arch/ia32/src/proc/scheduler.c – Rev 4343 → 4346

Rev 4343		Rev 4346
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/pm.h>	41	#include <arch/pm.h>
42	#include <arch/asm.h>	42	#include <arch/asm.h>
43	#include <arch/ddi/ddi.h>	43	#include <arch/ddi/ddi.h>
44		44
45	/** Perform ia32 specific tasks needed before the new task is run.	45	/** Perform ia32 specific tasks needed before the new task is run.
46	*	46	*
47	* Interrupts are disabled.	47	* Interrupts are disabled.
48	*/	48	*/
49	void before_task_runs_arch(void)	49	void before_task_runs_arch(void)
50	{	50	{
51	io_perm_bitmap_install();	51	io_perm_bitmap_install();
52	}	52	}
53		53
54	/** Perform ia32 specific tasks needed before the new thread is scheduled.	54	/** Perform ia32 specific tasks needed before the new thread is scheduled.
55	*	55	*
56	* THREAD is locked and interrupts are disabled.	56	* THREAD is locked and interrupts are disabled.
57	*/	57	*/
58	void before_thread_runs_arch(void)	58	void before_thread_runs_arch(void)
59	{	59	{
60	uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -	60	uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
61	SP_DELTA];	61	SP_DELTA];
62		62
63	/* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */	63	/* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */
64	write_msr(IA32_MSR_SYSENTER_ESP, kstk);	64	write_msr(IA32_MSR_SYSENTER_ESP, kstk);
65		65
66	/* Set kernel stack for CPL3 -> CPL0 switch via interrupt */	66	/* Set kernel stack for CPL3 -> CPL0 switch via interrupt */
67	CPU->arch.tss->esp0 = kstk;	67	CPU->arch.tss->esp0 = kstk;
68	CPU->arch.tss->ss0 = selector(KDATA_DES);	68	CPU->arch.tss->ss0 = gdtselector(KDATA_DES);
69		69
70	/* Set up TLS in GS register */	70	/* Set up TLS in GS register */
71	set_tls_desc(THREAD->arch.tls);	71	set_tls_desc(THREAD->arch.tls);
72	}	72	}
73		73
74	void after_thread_ran_arch(void)	74	void after_thread_ran_arch(void)
75	{	75	{
76	}	76	}
77		77
78	/** @}	78	/** @}
79	*/	79	*/
80		80