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 and a pointer to the last item
         * in the userspace window buffer to %g7 in the alternate and interrupt sets.
         */
        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 isntalled 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 – Rev 1879 → 1890

Rev 1879		Rev 1890
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	54	* Ensure that thread's kernel stack, as well as userspace window
55	* buffer for userspace threads, are locked in DTLB.	55	* buffer for userspace threads, are locked in DTLB.
56	* For userspace threads, initialize reserved global registers	56	* For userspace threads, initialize reserved global registers
57	* in the alternate and interrupt sets.	57	* in the alternate and interrupt sets.
58	*/	58	*/
59	void before_thread_runs_arch(void)	59	void before_thread_runs_arch(void)
60	{	60	{
61	uintptr_t base;	61	uintptr_t base;
62		62
63	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);	63	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
64		64
65	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) {	65	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<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) THREAD->kstack);	71	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
72	dtlb_insert_mapping((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);	72	dtlb_insert_mapping((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
73	}	73	}
74		74
75	if ((THREAD->flags & THREAD_FLAG_USPACE)) {	75	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
76	/*	76	/*
77	* If this thread executes also in userspace, we have to lock	77	* If this thread executes also in userspace, we have to lock
78	* its userspace window buffer into DTLB.	78	* its userspace window buffer into DTLB.
79	*/	79	*/
80	ASSERT(THREAD->arch.uspace_window_buffer);	80	ASSERT(THREAD->arch.uspace_window_buffer);
81	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);	81	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);
82	if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {	82	if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
83	/*	83	/*
84	* The buffer is not covered by the 4M locked kernel DTLB entry.	84	* The buffer is not covered by the 4M locked kernel DTLB entry.
85	*/	85	*/
86	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);	86	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
87	dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true);	87	dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true);
88	}	88	}
89		89
90	/*	90	/*
91	* Write kernel stack address to %g6 and a pointer to the last item	91	* Write kernel stack address to %g6 and a pointer to the last item
92	* in the userspace window buffer to %g7 in the alternate and interrupt sets.	92	* in the userspace window buffer to %g7 in the alternate and interrupt sets.
93	*/	93	*/
94	uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE	94	uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
95	- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));	95	- (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
96	write_to_ig_g6(sp);	96	write_to_ig_g6(sp);
97	write_to_ag_g6(sp);	97	write_to_ag_g6(sp);
98	write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);	98	write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
99	}	99	}
100	}	100	}
101		101
102	/** Perform sparc64 specific steps before a thread stops running.	102	/** Perform sparc64 specific steps before a thread stops running.
103	*	103	*
104	* Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack	104	* Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack
105	* and userspace window buffer).	105	* and userspace window buffer).
106	*/	106	*/
107	void after_thread_ran_arch(void)	107	void after_thread_ran_arch(void)
108	{	108	{
109	uintptr_t base;	109	uintptr_t base;
110		110
111	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);	111	base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
112		112
113	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) {	113	if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) {
114	/*	114	/*
115	* Kernel stack of this thread is locked in DTLB.	115	* Kernel stack of this thread is locked in DTLB.
116	* Destroy the mapping.	116	* Destroy the mapping.
117	*/	117	*/
118	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);	118	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
119	}	119	}
120		120
121	if ((THREAD->flags & THREAD_FLAG_USPACE)) {	121	if ((THREAD->flags & THREAD_FLAG_USPACE)) {
122	/*	122	/*
123	* If this thread executes also in userspace, we have to force all	123	* If this thread executes also in userspace, we have to
124	* its still-active userspace windows into the userspace window buffer	-
125	* and demap the buffer from DTLB.	124	* demap the userspace window buffer from DTLB.
126	*/	125	*/
127	ASSERT(THREAD->arch.uspace_window_buffer);	126	ASSERT(THREAD->arch.uspace_window_buffer);
128		127
129	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);	128	uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);
130	if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {	129	if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
131	/*	130	/*
132	* The buffer is not covered by the 4M locked kernel DTLB entry	131	* The buffer is not covered by the 4M locked kernel DTLB entry
133	* and therefore it was given a dedicated locked DTLB entry.	132	* and therefore it was given a dedicated locked DTLB entry.
134	* Demap it.	133	* Demap it.
135	*/	134	*/
136	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);	135	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
137	}	136	}
138		137
139	/* sample the state of the userspace window buffer */	138	/* sample the state of the userspace window buffer */
140	THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();	139	THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
141	}	140	}
142	}	141	}
143		142
144	/** @}	143	/** @}
145	*/	144	*/
146		145