WebSVN – HelenOS-historic – Diff – /kernel/trunk/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.
 */
 
#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 <adt/bitmap.h>
 
/** Perform ia32 specific tasks needed before the new task is run.
 *
 * Interrupts are disabled.
 */
void before_task_runs_arch(void)
{
    count_t bits;
    ptr_16_32_t cpugdtr;
    descriptor_t *gdt_p;
 
    /*
     * Switch the I/O Permission Bitmap, if necessary.
     */
 
    /* First, copy the I/O Permission Bitmap. */
    spinlock_lock(&TASK->lock);
    if ((bits = TASK->arch.iomap.bits)) {
        bitmap_t iomap;
 
        ASSERT(TASK->arch.iomap.map);
        bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
        bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
        /*
         * It is safe to set the trailing four bits because of the extra
         * convenience byte in TSS_IOMAP_SIZE.
         */
        bitmap_set_range(&iomap, TASK->arch.iomap.bits, 4);
    }
    spinlock_unlock(&TASK->lock);
 
    /* Second, adjust TSS segment limit. */
    gdtr_store(&cpugdtr);
    gdt_p = (descriptor_t *) cpugdtr.base;
    gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1);
    gdtr_load(&cpugdtr);
}
 
/** Perform ia32 specific tasks needed before the new thread is scheduled.
 *
 * THREAD is locked and interrupts are disabled.
 */
void before_thread_runs_arch(void)
{
    CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
    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)
        breakpoint_add(&((the_t *) THREAD->kstack)->as,
                   BKPOINT_WRITE | BKPOINT_CHECK_ZERO,
                   CPU->id);
#endif
}
 
void after_thread_ran_arch(void)
{
}
 

Rev 1190	Rev 1201
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	#include <proc/scheduler.h>	29	#include <proc/scheduler.h>
30	#include <cpu.h>	30	#include <cpu.h>
31	#include <proc/task.h>	31	#include <proc/task.h>
32	#include <proc/thread.h>	32	#include <proc/thread.h>
33	#include <arch.h>	33	#include <arch.h>
34	#include <arch/context.h> /* SP_DELTA */	34	#include <arch/context.h> /* SP_DELTA */
35	#include <arch/debugger.h>	35	#include <arch/debugger.h>
36	#include <arch/pm.h>	36	#include <arch/pm.h>
37	#include <arch/asm.h>	37	#include <arch/asm.h>
-		38	#include <adt/bitmap.h>
38		39
39	/** Perform ia32 specific tasks needed before the new task is run.	40	/** Perform ia32 specific tasks needed before the new task is run.
40	*	41	*
41	* Interrupts are disabled.	42	* Interrupts are disabled.
42	*/	43	*/
43	void before_task_runs_arch(void)	44	void before_task_runs_arch(void)
44	{	45	{
45	size_t iomap_size;	46	count_t bits;
46	ptr_16_32_t cpugdtr;	47	ptr_16_32_t cpugdtr;
47	descriptor_t *gdt_p;	48	descriptor_t *gdt_p;
48		49
49	/*	50	/*
50	* Switch the I/O Permission Bitmap, if necessary.	51	* Switch the I/O Permission Bitmap, if necessary.
51	*/	52	*/
52		53
53	/* First, copy the I/O Permission Bitmap. */	54	/* First, copy the I/O Permission Bitmap. */
54	spinlock_lock(&TASK->lock);	55	spinlock_lock(&TASK->lock);
55	iomap_size = TASK->arch.iomap_size;	56	if ((bits = TASK->arch.iomap.bits)) {
56	if (iomap_size) {	57	bitmap_t iomap;
-		58
57	ASSERT(TASK->arch.iomap);	59	ASSERT(TASK->arch.iomap.map);
-		60	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
58	memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size);	61	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
-		62	/*
-		63	* It is safe to set the trailing four bits because of the extra
-		64	* convenience byte in TSS_IOMAP_SIZE.
-		65	*/
59	CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */	66	bitmap_set_range(&iomap, TASK->arch.iomap.bits, 4);
60	}	67	}
61	spinlock_unlock(&TASK->lock);	68	spinlock_unlock(&TASK->lock);
62		69
63	/* Second, adjust TSS segment limit. */	70	/* Second, adjust TSS segment limit. */
64	gdtr_store(&cpugdtr);	71	gdtr_store(&cpugdtr);
65	gdt_p = (descriptor_t *) cpugdtr.base;	72	gdt_p = (descriptor_t *) cpugdtr.base;
66	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1);	73	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1);
67	gdtr_load(&cpugdtr);	74	gdtr_load(&cpugdtr);
68	}	75	}
69		76
70	/** Perform ia32 specific tasks needed before the new thread is scheduled.	77	/** Perform ia32 specific tasks needed before the new thread is scheduled.
71	*	78	*
72	* THREAD is locked and interrupts are disabled.	79	* THREAD is locked and interrupts are disabled.
73	*/	80	*/
74	void before_thread_runs_arch(void)	81	void before_thread_runs_arch(void)
75	{	82	{
76	CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];	83	CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
77	CPU->arch.tss->ss0 = selector(KDATA_DES);	84	CPU->arch.tss->ss0 = selector(KDATA_DES);
78		85
79	/* Set up TLS in GS register */	86	/* Set up TLS in GS register */
80	set_tls_desc(THREAD->arch.tls);	87	set_tls_desc(THREAD->arch.tls);
81		88
82	#ifdef CONFIG_DEBUG_AS_WATCHPOINT	89	#ifdef CONFIG_DEBUG_AS_WATCHPOINT
83	/* Set watchpoint on AS to ensure that nobody sets it to zero */	90	/* Set watchpoint on AS to ensure that nobody sets it to zero */
84	if (CPU->id < BKPOINTS_MAX)	91	if (CPU->id < BKPOINTS_MAX)
85	breakpoint_add(&((the_t *) THREAD->kstack)->as,	92	breakpoint_add(&((the_t *) THREAD->kstack)->as,
86	BKPOINT_WRITE \| BKPOINT_CHECK_ZERO,	93	BKPOINT_WRITE \| BKPOINT_CHECK_ZERO,
87	CPU->id);	94	CPU->id);
88	#endif	95	#endif
89	}	96	}
90		97
91	void after_thread_ran_arch(void)	98	void after_thread_ran_arch(void)
92	{	99	{
93	}	100	}
94		101

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/proc/scheduler.c – Rev 1190 → 1201