WebSVN – HelenOS – Diff – /SPARTAN/trunk/arch/ia32/src/mm/page.c


/*
 * Copyright (C) 2001-2004 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 <arch/types.h>
#include <config.h>
#include <func.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <arch/mm/page.h>
#include <arch/interrupt.h>
#include <arch/asm.h>
#include <synch/spinlock.h>
#include <debug.h>
 
 
 
 
 
 
 
 
 
 
__address bootstrap_dba;
 
void page_arch_init(void)
{
    __address dba;
    __u32 i;
 
    if (config.cpu_active == 1) {
        dba = frame_alloc(FRAME_KA | FRAME_PANIC);
        memsetb(dba, PAGE_SIZE, 0);
 
        bootstrap_dba = dba;
 
        /*
         * Identity mapping for all frames.
         * PA2KA(identity) mapping for all frames.
         */
        for (i = 0; i < frames; i++) {
            map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
            map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
        }
 
        trap_register(14, page_fault);
        write_cr3(KA2PA(dba));
    }
    else {
        /*
         * Application processors need to create their own view of the
         * virtual address space. Because of that, each AP copies
         * already-initialized paging information from the bootstrap
         * processor and adjusts it to fulfill its needs.
         */
 
        dba = frame_alloc(FRAME_KA | FRAME_PANIC);
        memcopy(bootstrap_dba, dba, PAGE_SIZE);
        write_cr3(KA2PA(dba));
    }
 
    paging_on();
}
 

Rev 125	Rev 167
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 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 <arch/types.h>	29	#include <arch/types.h>
30	#include <config.h>	30	#include <config.h>
31	#include <func.h>	31	#include <func.h>
32	#include <mm/frame.h>	32	#include <mm/frame.h>
33	#include <mm/page.h>	33	#include <mm/page.h>
34	#include <arch/mm/page.h>	34	#include <arch/mm/page.h>
35	#include <arch/interrupt.h>	35	#include <arch/interrupt.h>
36	#include <arch/asm.h>	36	#include <arch/asm.h>
37	#include <synch/spinlock.h>	37	#include <synch/spinlock.h>
38	#include <debug.h>	38	#include <debug.h>
39		39
40	/*	-
41	* Note.	-
42	* This is the preliminary code for controlling paging mechanism on ia32. It is	-
43	* needed by other parts of the kernel for its ability to map virtual addresses	-
44	* to physical. SMP code relies on this feature. Other than that, this code is	-
45	* by no means meant to implement virtual memory in terms of swapping pages in	-
46	* and out.	-
47	*/	-
48		-
49	__address bootstrap_dba;	40	__address bootstrap_dba;
50		41
51	void page_arch_init(void)	42	void page_arch_init(void)
52	{	43	{
53	__address dba;	44	__address dba;
54	__u32 i;	45	__u32 i;
55		46
56	if (config.cpu_active == 1) {	47	if (config.cpu_active == 1) {
57	dba = frame_alloc(FRAME_KA \| FRAME_PANIC);	48	dba = frame_alloc(FRAME_KA \| FRAME_PANIC);
58	memsetb(dba, PAGE_SIZE, 0);	49	memsetb(dba, PAGE_SIZE, 0);
59		50
60	bootstrap_dba = dba;	51	bootstrap_dba = dba;
61		52
62	/*	53	/*
63	* Identity mapping for all frames.	54	* Identity mapping for all frames.
64	* PA2KA(identity) mapping for all frames.	55	* PA2KA(identity) mapping for all frames.
65	*/	56	*/
66	for (i = 0; i < frames; i++) {	57	for (i = 0; i < frames; i++) {
67	map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));	58	map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
68	map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));	59	map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
69	}	60	}
70		61
71	trap_register(14, page_fault);	62	trap_register(14, page_fault);
72	write_cr3(KA2PA(dba));	63	write_cr3(KA2PA(dba));
73	}	64	}
74	else {	65	else {
75	/*	66	/*
76	* Application processors need to create their own view of the	67	* Application processors need to create their own view of the
77	* virtual address space. Because of that, each AP copies	68	* virtual address space. Because of that, each AP copies
78	* already-initialized paging information from the bootstrap	69	* already-initialized paging information from the bootstrap
79	* processor and adjusts it to fulfill its needs.	70	* processor and adjusts it to fulfill its needs.
80	*/	71	*/
81		72
82	dba = frame_alloc(FRAME_KA \| FRAME_PANIC);	73	dba = frame_alloc(FRAME_KA \| FRAME_PANIC);
83	memcopy(bootstrap_dba, dba, PAGE_SIZE);	74	memcopy(bootstrap_dba, dba, PAGE_SIZE);
84	write_cr3(KA2PA(dba));	75	write_cr3(KA2PA(dba));
85	}	76	}
86		77
87	paging_on();	78	paging_on();
88	}	79	}
89		80

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/mm/page.c – Rev 125 → 167