WebSVN – HelenOS – Diff – /trunk/kernel/arch/sparc64/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 sparc64proc
 * @{
 */
/** @file
 */
 
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <arch.h>
#include <arch/asm.h>
#include <arch/stack.h>
 
/** Perform sparc64 specific tasks needed before the new task is run. */
void before_task_runs_arch(void)
{
}
 
/** Perform sparc64 specific steps before scheduling a thread.
 *
 * For userspace threads, initialize reserved global registers in the alternate
 * and interrupt sets.
 */
void before_thread_runs_arch(void)
{
    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
        /*
         * Write kernel stack address to %g6 of the alternate and
         * interrupt global sets.
         *
         * Write pointer to the last item in the userspace window buffer
         * to %g7 in the alternate set. Write to the interrupt %g7 is
         * not necessary because:
         * - spill traps operate only in the alternate global set,
         * - preemptible trap handler switches to alternate globals
         *   before it explicitly uses %g7.
         */
        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
            - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
            STACK_ALIGNMENT));
        write_to_ig_g6(sp);
        write_to_ag_g6(sp);
        write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
    }
}
 
/** Perform sparc64 specific steps before a thread stops running. */
void after_thread_ran_arch(void)
{
    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
        /* sample the state of the userspace window buffer */  
        THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
    }
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/sparc64/src/proc/scheduler.c – Rev 2055 → 2071

Rev 2055		Rev 2071
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 sparc64proc	29	/** @addtogroup sparc64proc
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <proc/scheduler.h>	35	#include <proc/scheduler.h>
36	#include <proc/thread.h>	36	#include <proc/thread.h>
37	#include <arch.h>	37	#include <arch.h>
38	#include <arch/asm.h>	38	#include <arch/asm.h>
39	#include <arch/stack.h>	39	#include <arch/stack.h>
40		40
41	/** Perform sparc64 specific tasks needed before the new task is run. */	41	/** Perform sparc64 specific tasks needed before the new task is run. */
42	void before_task_runs_arch(void)	42	void before_task_runs_arch(void)
43	{	43	{
44	}	44	}
45		45
46	/** Perform sparc64 specific steps before scheduling a thread.	46	/** Perform sparc64 specific steps before scheduling a thread.
47	*	47	*
48	* For userspace threads, initialize reserved global registers in the alternate	48	* For userspace threads, initialize reserved global registers in the alternate
49	* and interrupt sets.	49	* and interrupt sets.
50	*/	50	*/
51	void before_thread_runs_arch(void)	51	void before_thread_runs_arch(void)
52	{	52	{
53	if ((THREAD->flags & THREAD_FLAG_USPACE)) {	53	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
54	/*	54	/*
55	* Write kernel stack address to %g6 of the alternate and	55	* Write kernel stack address to %g6 of the alternate and
56	* interrupt global sets.	56	* interrupt global sets.
57	*	57	*
58	* Write pointer to the last item in the userspace window buffer	58	* Write pointer to the last item in the userspace window buffer
59	* to %g7 in the alternate set. Write to the interrupt %g7 is	59	* to %g7 in the alternate set. Write to the interrupt %g7 is
60	* not necessary because:	60	* not necessary because:
61	* - spill traps operate only in the alternate global set,	61	* - spill traps operate only in the alternate global set,
62	* - preemptible trap handler switches to alternate globals	62	* - preemptible trap handler switches to alternate globals
63	* before it explicitly uses %g7.	63	* before it explicitly uses %g7.
64	*/	64	*/
65	uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE	65	uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
66	- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,	66	- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
67	STACK_ALIGNMENT));	67	STACK_ALIGNMENT));
68	write_to_ig_g6(sp);	68	write_to_ig_g6(sp);
69	write_to_ag_g6(sp);	69	write_to_ag_g6(sp);
70	write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);	70	write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
71	}	71	}
72	}	72	}
73		73
74	/** Perform sparc64 specific steps before a thread stops running. */	74	/** Perform sparc64 specific steps before a thread stops running. */
75	void after_thread_ran_arch(void)	75	void after_thread_ran_arch(void)
76	{	76	{
77	if ((THREAD->flags & THREAD_FLAG_USPACE)) {	77	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
78	/* sample the state of the userspace window buffer */	78	/* sample the state of the userspace window buffer */
79	THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();	79	THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
80	}	80	}
81	}	81	}
82		82
83	/** @}	83	/** @}
84	*/	84	*/
85		85