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/regdef.h>
#include <arch/stack.h>
#include <arch/mm/tlb.h>
#include <arch/mm/page.h>
#include <config.h>
#include <align.h>
#include <macros.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.
 *
 * Ensure that thread's kernel stack, as well as userspace window buffer for
 * userspace threads, are locked in DTLB. For userspace threads, initialize
 * reserved global registers in the alternate and interrupt sets.
 */
void before_thread_runs_arch(void)
{
    uintptr_t base;
   
    base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
 
    if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
        KERNEL_PAGE_WIDTH))) {
        /*
         * Kernel stack of this thread is not locked in DTLB.
         * First, make sure it is not mapped already.
         * If not, create a locked mapping for it.
         */
        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)
            THREAD->kstack);
        dtlb_insert_mapping((uintptr_t) THREAD->kstack,
            KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
    }
   
    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
        /*
         * If this thread executes also in userspace, we have to lock
         * its userspace window buffer into DTLB.
         */
        ASSERT(THREAD->arch.uspace_window_buffer);
        uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
            THREAD->arch.uspace_window_buffer, PAGE_SIZE);
        if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH))
            {
            /*
             * The buffer is not covered by the 4M locked kernel
             * DTLB entry.
             */
            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
            dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K,
                true, true);
        }
       
        /*
         * 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.
 *
 * Demap any locked DTLB entries installed by the thread (i.e. kernel stack
 * and userspace window buffer).
 */
void after_thread_ran_arch(void)
{
    uintptr_t base;
 
    base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
 
    if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
        KERNEL_PAGE_WIDTH))) {
        /*
         * Kernel stack of this thread is locked in DTLB.
         * Destroy the mapping.
         */
        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)
            THREAD->kstack);
    }
   
    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
        /*
         * If this thread executes also in userspace, we have to
         * demap the userspace window buffer from DTLB.
         */
        ASSERT(THREAD->arch.uspace_window_buffer);
       
        uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
            THREAD->arch.uspace_window_buffer, PAGE_SIZE);
        if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
            /*
             * The buffer is not covered by the 4M locked kernel DTLB entry
             * and therefore it was given a dedicated locked DTLB entry.
             * Demap it.
             */
            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
        }
   
        /* 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 @ 2106 – Rev 2049 → 2054

Rev 2049		Rev 2054
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/regdef.h>	39	#include <arch/regdef.h>
40	#include <arch/stack.h>	40	#include <arch/stack.h>
41	#include <arch/mm/tlb.h>	41	#include <arch/mm/tlb.h>
42	#include <arch/mm/page.h>	42	#include <arch/mm/page.h>
43	#include <config.h>	43	#include <config.h>
44	#include <align.h>	44	#include <align.h>
45	#include <macros.h>	45	#include <macros.h>
46		46
47	/** Perform sparc64 specific tasks needed before the new task is run. */	47	/** Perform sparc64 specific tasks needed before the new task is run. */
48	void before_task_runs_arch(void)	48	void before_task_runs_arch(void)
49	{	49	{
50	}	50	}
51		51
52	/** Perform sparc64 specific steps before scheduling a thread.	52	/** Perform sparc64 specific steps before scheduling a thread.
53	*	53	*
54	* Ensure that thread's kernel stack, as well as userspace window buffer for	54	* Ensure that thread's kernel stack, as well as userspace window buffer for
55	* userspace threads, are locked in DTLB. For userspace threads, initialize	55	* userspace threads, are locked in DTLB. For userspace threads, initialize
56	* reserved global registers in the alternate and interrupt sets.	56	* reserved global registers in the alternate and interrupt sets.
57	*/	57	*/
58	void before_thread_runs_arch(void)	58	void before_thread_runs_arch(void)
59	{	59	{
60	uintptr_t base;	60	uintptr_t base;
61		61
62	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);	62	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
63		63
64	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<	64	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
65	KERNEL_PAGE_WIDTH))) {	65	KERNEL_PAGE_WIDTH))) {
66	/*	66	/*
67	* Kernel stack of this thread is not locked in DTLB.	67	* Kernel stack of this thread is not locked in DTLB.
68	* First, make sure it is not mapped already.	68	* First, make sure it is not mapped already.
69	* If not, create a locked mapping for it.	69	* If not, create a locked mapping for it.
70	*/	70	*/
71	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)	71	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)
72	THREAD->kstack);	72	THREAD->kstack);
73	dtlb_insert_mapping((uintptr_t) THREAD->kstack,	73	dtlb_insert_mapping((uintptr_t) THREAD->kstack,
74	KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);	74	KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
75	}	75	}
76		76
77	if ((THREAD->flags & THREAD_FLAG_USPACE)) {	77	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
78	/*	78	/*
79	* If this thread executes also in userspace, we have to lock	79	* If this thread executes also in userspace, we have to lock
80	* its userspace window buffer into DTLB.	80	* its userspace window buffer into DTLB.
81	*/	81	*/
82	ASSERT(THREAD->arch.uspace_window_buffer);	82	ASSERT(THREAD->arch.uspace_window_buffer);
83	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)	83	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
84	THREAD->arch.uspace_window_buffer, PAGE_SIZE);	84	THREAD->arch.uspace_window_buffer, PAGE_SIZE);
85	if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH))	85	if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH))
86	{	86	{
87	/*	87	/*
88	* The buffer is not covered by the 4M locked kernel	88	* The buffer is not covered by the 4M locked kernel
89	* DTLB entry.	89	* DTLB entry.
90	*/	90	*/
91	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);	91	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
92	dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K,	92	dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K,
93	true, true);	93	true, true);
94	}	94	}
95		95
96	/*	96	/*
97	* Write kernel stack address to %g6 and a pointer to the last	97	* Write kernel stack address to %g6 of the alternate and
-		98	* interrupt global sets.
-		99	*
-		100	* Write pointer to the last item in the userspace window buffer
98	* item in the userspace window buffer to %g7 in the alternate	101	* to %g7 in the alternate set. Write to the interrupt %g7 is
99	* and interrupt sets.	102	* not necessary because:
-		103	* - spill traps operate only in the alternate global set,
-		104	* - preemptible trap handler switches to alternate globals
-		105	* before it explicitly uses %g7.
100	*/	106	*/
101	uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE	107	uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
102	- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,	108	- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
103	STACK_ALIGNMENT));	109	STACK_ALIGNMENT));
104	write_to_ig_g6(sp);	110	write_to_ig_g6(sp);
105	write_to_ag_g6(sp);	111	write_to_ag_g6(sp);
106	write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);	112	write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
107	}	113	}
108	}	114	}
109		115
110	/** Perform sparc64 specific steps before a thread stops running.	116	/** Perform sparc64 specific steps before a thread stops running.
111	*	117	*
112	* Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack	118	* Demap any locked DTLB entries installed by the thread (i.e. kernel stack
113	* and userspace window buffer).	119	* and userspace window buffer).
114	*/	120	*/
115	void after_thread_ran_arch(void)	121	void after_thread_ran_arch(void)
116	{	122	{
117	uintptr_t base;	123	uintptr_t base;
118		124
119	base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);	125	base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
120		126
121	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<	127	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
122	KERNEL_PAGE_WIDTH))) {	128	KERNEL_PAGE_WIDTH))) {
123	/*	129	/*
124	* Kernel stack of this thread is locked in DTLB.	130	* Kernel stack of this thread is locked in DTLB.
125	* Destroy the mapping.	131	* Destroy the mapping.
126	*/	132	*/
127	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)	133	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t)
128	THREAD->kstack);	134	THREAD->kstack);
129	}	135	}
130		136
131	if ((THREAD->flags & THREAD_FLAG_USPACE)) {	137	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
132	/*	138	/*
133	* If this thread executes also in userspace, we have to	139	* If this thread executes also in userspace, we have to
134	* demap the userspace window buffer from DTLB.	140	* demap the userspace window buffer from DTLB.
135	*/	141	*/
136	ASSERT(THREAD->arch.uspace_window_buffer);	142	ASSERT(THREAD->arch.uspace_window_buffer);
137		143
138	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)	144	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
139	THREAD->arch.uspace_window_buffer, PAGE_SIZE);	145	THREAD->arch.uspace_window_buffer, PAGE_SIZE);
140	if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {	146	if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
141	/*	147	/*
142	* The buffer is not covered by the 4M locked kernel DTLB entry	148	* The buffer is not covered by the 4M locked kernel DTLB entry
143	* and therefore it was given a dedicated locked DTLB entry.	149	* and therefore it was given a dedicated locked DTLB entry.
144	* Demap it.	150	* Demap it.
145	*/	151	*/
146	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);	152	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
147	}	153	}
148		154
149	/* sample the state of the userspace window buffer */	155	/* sample the state of the userspace window buffer */
150	THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();	156	THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
151	}	157	}
152	}	158	}
153		159
154	/** @}	160	/** @}
155	*/	161	*/
156		162