WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia64/src/proc/scheduler.c


/*
 * Copyright (C) 2006 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 ia64proc
 
 * @{
 */
/** @file
 */
 
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <arch.h>
#include <arch/register.h>
#include <arch/context.h>
#include <arch/stack.h>
#include <arch/mm/tlb.h>
#include <config.h>
#include <align.h>
 
/** Perform ia64 specific tasks needed before the new task is run. */
void before_task_runs_arch(void)
{
}
 
/** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */
void before_thread_runs_arch(void)
{
    __address base;
   
    base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
 
    if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<(KERNEL_PAGE_WIDTH))) {
        /*
         * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
         * Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it.
         */
         
        /* purge DTR[TR_STACK1] and DTR[TR_STACK2] */
        dtr_purge((__address) THREAD->kstack, PAGE_WIDTH+1);
       
        /* insert DTR[TR_STACK1] and DTR[TR_STACK2] */
        dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK1);
        dtlb_kernel_mapping_insert((__address) THREAD->kstack + PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true, DTR_KSTACK2);
    }
   
    /*
     * Record address of kernel backing store to bank 0 r22.
     * Record address of kernel stack to bank 0 r23.
     * These values will be found there after switch from userspace.
     */
    __asm__ volatile (
        "bsw.0\n"
        "mov r22 = %0\n"
        "mov r23 = %1\n"
        "bsw.1\n"
        :
        : "r" (&THREAD->kstack[THREAD_STACK_SIZE]),
          "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])
        );
}
 
void after_thread_ran_arch(void)
{
}
 
 /** @}
 */
 
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia64/src/proc/scheduler.c – Rev 1702 → 1705

Rev 1702		Rev 1705
1	/*	1	/*
2	* Copyright (C) 2006 Jakub Jermar	2	* Copyright (C) 2006 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 ia64proc ia64	29	/** @addtogroup ia64proc
30	* @ingroup proc	-
31	* @{	30	* @{
32	*/	31	*/
33	/** @file	32	/** @file
34	*/	33	*/
35		34
36	#include <proc/scheduler.h>	35	#include <proc/scheduler.h>
37	#include <proc/thread.h>	36	#include <proc/thread.h>
38	#include <arch.h>	37	#include <arch.h>
39	#include <arch/register.h>	38	#include <arch/register.h>
40	#include <arch/context.h>	39	#include <arch/context.h>
41	#include <arch/stack.h>	40	#include <arch/stack.h>
42	#include <arch/mm/tlb.h>	41	#include <arch/mm/tlb.h>
43	#include <config.h>	42	#include <config.h>
44	#include <align.h>	43	#include <align.h>
45		44
46	/** Perform ia64 specific tasks needed before the new task is run. */	45	/** Perform ia64 specific tasks needed before the new task is run. */
47	void before_task_runs_arch(void)	46	void before_task_runs_arch(void)
48	{	47	{
49	}	48	}
50		49
51	/** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */	50	/** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */
52	void before_thread_runs_arch(void)	51	void before_thread_runs_arch(void)
53	{	52	{
54	__address base;	53	__address base;
55		54
56	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);	55	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
57		56
58	if ((__address) THREAD->kstack < base \|\| (__address) THREAD->kstack > base + (1<<(KERNEL_PAGE_WIDTH))) {	57	if ((__address) THREAD->kstack < base \|\| (__address) THREAD->kstack > base + (1<<(KERNEL_PAGE_WIDTH))) {
59	/*	58	/*
60	* Kernel stack of this thread is not mapped by DTR[TR_KERNEL].	59	* Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
61	* Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it.	60	* Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it.
62	*/	61	*/
63		62
64	/* purge DTR[TR_STACK1] and DTR[TR_STACK2] */	63	/* purge DTR[TR_STACK1] and DTR[TR_STACK2] */
65	dtr_purge((__address) THREAD->kstack, PAGE_WIDTH+1);	64	dtr_purge((__address) THREAD->kstack, PAGE_WIDTH+1);
66		65
67	/* insert DTR[TR_STACK1] and DTR[TR_STACK2] */	66	/* insert DTR[TR_STACK1] and DTR[TR_STACK2] */
68	dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK1);	67	dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK1);
69	dtlb_kernel_mapping_insert((__address) THREAD->kstack + PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true, DTR_KSTACK2);	68	dtlb_kernel_mapping_insert((__address) THREAD->kstack + PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true, DTR_KSTACK2);
70	}	69	}
71		70
72	/*	71	/*
73	* Record address of kernel backing store to bank 0 r22.	72	* Record address of kernel backing store to bank 0 r22.
74	* Record address of kernel stack to bank 0 r23.	73	* Record address of kernel stack to bank 0 r23.
75	* These values will be found there after switch from userspace.	74	* These values will be found there after switch from userspace.
76	*/	75	*/
77	__asm__ volatile (	76	__asm__ volatile (
78	"bsw.0\n"	77	"bsw.0\n"
79	"mov r22 = %0\n"	78	"mov r22 = %0\n"
80	"mov r23 = %1\n"	79	"mov r23 = %1\n"
81	"bsw.1\n"	80	"bsw.1\n"
82	:	81	:
83	: "r" (&THREAD->kstack[THREAD_STACK_SIZE]),	82	: "r" (&THREAD->kstack[THREAD_STACK_SIZE]),
84	"r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])	83	"r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])
85	);	84	);
86	}	85	}
87		86
88	void after_thread_ran_arch(void)	87	void after_thread_ran_arch(void)
89	{	88	{
90	}	89	}
91		90
92	/** @}	91	/** @}
93	*/	92	*/
94		93
95		94