WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/amd64/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/mm/page.h>
#include <genarch/mm/page_pt.h>
#include <arch/mm/frame.h>
#include <mm/page.h>
#include <mm/frame.h>
#include <mm/as.h>
#include <arch/interrupt.h>
#include <arch/asm.h>
#include <config.h>
#include <memstr.h>
#include <interrupt.h>
#include <print.h>
#include <panic.h>
#include <align.h>
 
/* Definitions for identity page mapper */
pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
extern pte_t ptl_0; /* From boot.S */
 
#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
 
#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
 
#define SETUP_PTL1(ptl0, page, tgt)  {  \
    SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
        SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
    }
#define SETUP_PTL2(ptl1, page, tgt)  {  \
    SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
        SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
    }
#define SETUP_PTL3(ptl2, page, tgt)  {  \
    SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
        SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
    }
#define SETUP_FRAME(ptl3, page, tgt)  { \
    SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
        SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
    }
 
 
void page_arch_init(void)
{
    __address cur;
    int i;
    int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL;
 
    if (config.cpu_active == 1) {
        page_mapping_operations = &pt_mapping_operations;
       
        /*
         * PA2KA(identity) mapping for all frames.
         */
        for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
            /* Standard identity mapping */
            page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
        }
        /* Upper kernel mapping
         * - from zero to top of kernel (include bottom addresses
         *   because some are needed for init )
         */
        for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) {
            page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
        }
        for (i=0; i < init.cnt; i++) {
            for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) {
                page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
            }
        }
 
        exc_register(14, "page_fault", (iroutine)page_fault);
        write_cr3((__address) AS_KERNEL->page_table);
    }
    else {
        write_cr3((__address) AS_KERNEL->page_table);
    }
}
 
 
/** Identity page mapper
 *
 * We need to map whole physical memory identically before the page subsystem
 * is initializaed. This thing clears page table and fills in the specific
 * items.
 */
void ident_page_fault(int n, istate_t *istate)
{
    __address page;
    static __address oldpage = 0;
    pte_t *aptl_1, *aptl_2, *aptl_3;
 
    page = read_cr2();
    if (oldpage) {
        /* Unmap old address */
        aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
        aptl_2 = PTL2_ADDR(aptl_1, oldpage);
        aptl_3 = PTL3_ADDR(aptl_2, oldpage);
 
        SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
        if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
            SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
        if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
            SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
        if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
            SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
    }
    if (PTL1_PRESENT(&ptl_0, page))
        aptl_1 = PTL1_ADDR(&ptl_0, page);
    else {
        SETUP_PTL1(&ptl_0, page, helper_ptl1);
        aptl_1 = helper_ptl1;
    }
       
    if (PTL2_PRESENT(aptl_1, page))
        aptl_2 = PTL2_ADDR(aptl_1, page);
    else {
        SETUP_PTL2(aptl_1, page, helper_ptl2);
        aptl_2 = helper_ptl2;
    }
 
    if (PTL3_PRESENT(aptl_2, page))
        aptl_3 = PTL3_ADDR(aptl_2, page);
    else {
        SETUP_PTL3(aptl_2, page, helper_ptl3);
        aptl_3 = helper_ptl3;
    }
   
    SETUP_FRAME(aptl_3, page, page);
 
    oldpage = page;
}
 
 
void page_fault(int n, istate_t *istate)
{
    __address page;
    pf_access_t access;
   
    page = read_cr2();
   
    if (istate->error_word & PFERR_CODE_RSVD)
        panic("Reserved bit set in page table entry.\n");
   
    if (istate->error_word & PFERR_CODE_RW)
        access = PF_ACCESS_WRITE;
    else if (istate->error_word & PFERR_CODE_ID)
        access = PF_ACCESS_EXEC;
    else
        access = PF_ACCESS_READ;
   
    if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
        fault_if_from_uspace(istate, "Page fault: %#x", page);
 
        print_info_errcode(n, istate);
        printf("Page fault address: %llX\n", page);
        panic("page fault\n");
    }
}
 
 
__address hw_map(__address physaddr, size_t size)
{
    if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
        panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
   
    __address virtaddr = PA2KA(last_frame);
    pfn_t i;
    for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
        page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
   
    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
   
    return virtaddr;
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/amd64/src/mm/page.c – Rev 1411 → 1595

Rev 1411		Rev 1595
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/mm/page.h>	29	#include <arch/mm/page.h>
30	#include <genarch/mm/page_pt.h>	30	#include <genarch/mm/page_pt.h>
31	#include <arch/mm/frame.h>	31	#include <arch/mm/frame.h>
32	#include <mm/page.h>	32	#include <mm/page.h>
33	#include <mm/frame.h>	33	#include <mm/frame.h>
34	#include <mm/as.h>	34	#include <mm/as.h>
35	#include <arch/interrupt.h>	35	#include <arch/interrupt.h>
36	#include <arch/asm.h>	36	#include <arch/asm.h>
37	#include <config.h>	37	#include <config.h>
38	#include <memstr.h>	38	#include <memstr.h>
39	#include <interrupt.h>	39	#include <interrupt.h>
40	#include <print.h>	40	#include <print.h>
41	#include <panic.h>	41	#include <panic.h>
42	#include <align.h>	42	#include <align.h>
43		43
44	/* Definitions for identity page mapper */	44	/* Definitions for identity page mapper */
45	pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));	45	pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
46	pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));	46	pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
47	pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));	47	pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
48	extern pte_t ptl_0; /* From boot.S */	48	extern pte_t ptl_0; /* From boot.S */
49		49
50	#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))	50	#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
51	#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))	51	#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
52	#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))	52	#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
53		53
54	#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))	54	#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
55	#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))	55	#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
56	#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))	56	#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
57		57
58	#define SETUP_PTL1(ptl0, page, tgt) { \	58	#define SETUP_PTL1(ptl0, page, tgt) { \
59	SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \	59	SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
60	SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	60	SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
61	}	61	}
62	#define SETUP_PTL2(ptl1, page, tgt) { \	62	#define SETUP_PTL2(ptl1, page, tgt) { \
63	SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \	63	SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
64	SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	64	SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
65	}	65	}
66	#define SETUP_PTL3(ptl2, page, tgt) { \	66	#define SETUP_PTL3(ptl2, page, tgt) { \
67	SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \	67	SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
68	SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	68	SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
69	}	69	}
70	#define SETUP_FRAME(ptl3, page, tgt) { \	70	#define SETUP_FRAME(ptl3, page, tgt) { \
71	SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \	71	SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
72	SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	72	SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
73	}	73	}
74		74
75		75
76	void page_arch_init(void)	76	void page_arch_init(void)
77	{	77	{
78	__address cur;	78	__address cur;
79	int i;	79	int i;
80	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL;	80	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL;
81		81
82	if (config.cpu_active == 1) {	82	if (config.cpu_active == 1) {
83	page_mapping_operations = &pt_mapping_operations;	83	page_mapping_operations = &pt_mapping_operations;
84		84
85	/*	85	/*
86	* PA2KA(identity) mapping for all frames.	86	* PA2KA(identity) mapping for all frames.
87	*/	87	*/
88	for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {	88	for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
89	/* Standard identity mapping */	89	/* Standard identity mapping */
90	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);	90	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
91	}	91	}
92	/* Upper kernel mapping	92	/* Upper kernel mapping
93	* - from zero to top of kernel (include bottom addresses	93	* - from zero to top of kernel (include bottom addresses
94	* because some are needed for init )	94	* because some are needed for init )
95	*/	95	*/
96	for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) {	96	for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) {
97	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);	97	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
98	}	98	}
99	for (i=0; i < init.cnt; i++) {	99	for (i=0; i < init.cnt; i++) {
100	for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) {	100	for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) {
101	page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);	101	page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
102	}	102	}
103	}	103	}
104		104
105	exc_register(14, "page_fault", (iroutine)page_fault);	105	exc_register(14, "page_fault", (iroutine)page_fault);
106	write_cr3((__address) AS_KERNEL->page_table);	106	write_cr3((__address) AS_KERNEL->page_table);
107	}	107	}
108	else {	108	else {
109	write_cr3((__address) AS_KERNEL->page_table);	109	write_cr3((__address) AS_KERNEL->page_table);
110	}	110	}
111	}	111	}
112		112
113		113
114	/** Identity page mapper	114	/** Identity page mapper
115	*	115	*
116	* We need to map whole physical memory identically before the page subsystem	116	* We need to map whole physical memory identically before the page subsystem
117	* is initializaed. This thing clears page table and fills in the specific	117	* is initializaed. This thing clears page table and fills in the specific
118	* items.	118	* items.
119	*/	119	*/
120	void ident_page_fault(int n, istate_t *istate)	120	void ident_page_fault(int n, istate_t *istate)
121	{	121	{
122	__address page;	122	__address page;
123	static __address oldpage = 0;	123	static __address oldpage = 0;
124	pte_t aptl_1, aptl_2, *aptl_3;	124	pte_t aptl_1, aptl_2, *aptl_3;
125		125
126	page = read_cr2();	126	page = read_cr2();
127	if (oldpage) {	127	if (oldpage) {
128	/* Unmap old address */	128	/* Unmap old address */
129	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);	129	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
130	aptl_2 = PTL2_ADDR(aptl_1, oldpage);	130	aptl_2 = PTL2_ADDR(aptl_1, oldpage);
131	aptl_3 = PTL3_ADDR(aptl_2, oldpage);	131	aptl_3 = PTL3_ADDR(aptl_2, oldpage);
132		132
133	SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	133	SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
134	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))	134	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
135	SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	135	SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
136	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))	136	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
137	SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	137	SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
138	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))	138	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
139	SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	139	SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
140	}	140	}
141	if (PTL1_PRESENT(&ptl_0, page))	141	if (PTL1_PRESENT(&ptl_0, page))
142	aptl_1 = PTL1_ADDR(&ptl_0, page);	142	aptl_1 = PTL1_ADDR(&ptl_0, page);
143	else {	143	else {
144	SETUP_PTL1(&ptl_0, page, helper_ptl1);	144	SETUP_PTL1(&ptl_0, page, helper_ptl1);
145	aptl_1 = helper_ptl1;	145	aptl_1 = helper_ptl1;
146	}	146	}
147		147
148	if (PTL2_PRESENT(aptl_1, page))	148	if (PTL2_PRESENT(aptl_1, page))
149	aptl_2 = PTL2_ADDR(aptl_1, page);	149	aptl_2 = PTL2_ADDR(aptl_1, page);
150	else {	150	else {
151	SETUP_PTL2(aptl_1, page, helper_ptl2);	151	SETUP_PTL2(aptl_1, page, helper_ptl2);
152	aptl_2 = helper_ptl2;	152	aptl_2 = helper_ptl2;
153	}	153	}
154		154
155	if (PTL3_PRESENT(aptl_2, page))	155	if (PTL3_PRESENT(aptl_2, page))
156	aptl_3 = PTL3_ADDR(aptl_2, page);	156	aptl_3 = PTL3_ADDR(aptl_2, page);
157	else {	157	else {
158	SETUP_PTL3(aptl_2, page, helper_ptl3);	158	SETUP_PTL3(aptl_2, page, helper_ptl3);
159	aptl_3 = helper_ptl3;	159	aptl_3 = helper_ptl3;
160	}	160	}
161		161
162	SETUP_FRAME(aptl_3, page, page);	162	SETUP_FRAME(aptl_3, page, page);
163		163
164	oldpage = page;	164	oldpage = page;
165	}	165	}
166		166
167		167
168	void page_fault(int n, istate_t *istate)	168	void page_fault(int n, istate_t *istate)
169	{	169	{
170	__address page;	170	__address page;
171	pf_access_t access;	171	pf_access_t access;
172		172
173	page = read_cr2();	173	page = read_cr2();
174		174
175	if (istate->error_word & PFERR_CODE_RSVD)	175	if (istate->error_word & PFERR_CODE_RSVD)
176	panic("Reserved bit set in page table entry.\n");	176	panic("Reserved bit set in page table entry.\n");
177		177
178	if (istate->error_word & PFERR_CODE_RW)	178	if (istate->error_word & PFERR_CODE_RW)
179	access = PF_ACCESS_WRITE;	179	access = PF_ACCESS_WRITE;
180	else if (istate->error_word & PFERR_CODE_ID)	180	else if (istate->error_word & PFERR_CODE_ID)
181	access = PF_ACCESS_EXEC;	181	access = PF_ACCESS_EXEC;
182	else	182	else
183	access = PF_ACCESS_READ;	183	access = PF_ACCESS_READ;
184		184
185	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {	185	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
-		186	fault_if_from_uspace(istate, "Page fault: %#x", page);
-		187
186	print_info_errcode(n, istate);	188	print_info_errcode(n, istate);
187	printf("Page fault address: %llX\n", page);	189	printf("Page fault address: %llX\n", page);
188	panic("page fault\n");	190	panic("page fault\n");
189	}	191	}
190	}	192	}
191		193
192		194
193	__address hw_map(__address physaddr, size_t size)	195	__address hw_map(__address physaddr, size_t size)
194	{	196	{
195	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))	197	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
196	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)	198	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
197		199
198	__address virtaddr = PA2KA(last_frame);	200	__address virtaddr = PA2KA(last_frame);
199	pfn_t i;	201	pfn_t i;
200	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	202	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
201	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);	203	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
202		204
203	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	205	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
204		206
205	return virtaddr;	207	return virtaddr;
206	}	208	}
207		209