WebSVN – HelenOS – Diff – /trunk/kernel/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.
 */
 
/** @addtogroup amd64mm
 * @{
 */
/** @file
 */
 
#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), (uintptr_t)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), (uintptr_t)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), (uintptr_t)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), (uintptr_t)KA2PA(tgt)); \
        SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
    }
 
 
void page_arch_init(void)
{
    uintptr_t 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 (cur = config.stack_base; cur < config.stack_base + config.stack_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].addr + 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((uintptr_t) AS_KERNEL->page_table);
    }
    else {
        write_cr3((uintptr_t) 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)
{
    uintptr_t page;
    static uintptr_t 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)
{
    uintptr_t 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);
 
        decode_istate(n, istate);
        printf("Page fault address: %llx\n", page);
        panic("page fault\n");
    }
}
 
 
uintptr_t hw_map(uintptr_t 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)
   
    uintptr_t 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

(root)/trunk/kernel/arch/amd64/src/mm/page.c – Rev 1958 → 2071

Rev 1958		Rev 2071
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	/** @addtogroup amd64mm	29	/** @addtogroup amd64mm
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <arch/mm/page.h>	35	#include <arch/mm/page.h>
36	#include <genarch/mm/page_pt.h>	36	#include <genarch/mm/page_pt.h>
37	#include <arch/mm/frame.h>	37	#include <arch/mm/frame.h>
38	#include <mm/page.h>	38	#include <mm/page.h>
39	#include <mm/frame.h>	39	#include <mm/frame.h>
40	#include <mm/as.h>	40	#include <mm/as.h>
41	#include <arch/interrupt.h>	41	#include <arch/interrupt.h>
42	#include <arch/asm.h>	42	#include <arch/asm.h>
43	#include <config.h>	43	#include <config.h>
44	#include <memstr.h>	44	#include <memstr.h>
45	#include <interrupt.h>	45	#include <interrupt.h>
46	#include <print.h>	46	#include <print.h>
47	#include <panic.h>	47	#include <panic.h>
48	#include <align.h>	48	#include <align.h>
49		49
50	/* Definitions for identity page mapper */	50	/* Definitions for identity page mapper */
51	pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));	51	pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
52	pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));	52	pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
53	pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));	53	pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
54	extern pte_t ptl_0; /* From boot.S */	54	extern pte_t ptl_0; /* From boot.S */
55		55
56	#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))	56	#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
57	#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))	57	#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
58	#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))	58	#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
59		59
60	#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))	60	#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
61	#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))	61	#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
62	#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))	62	#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
63		63
64	#define SETUP_PTL1(ptl0, page, tgt) { \	64	#define SETUP_PTL1(ptl0, page, tgt) { \
65	SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \	65	SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
66	SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	66	SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
67	}	67	}
68	#define SETUP_PTL2(ptl1, page, tgt) { \	68	#define SETUP_PTL2(ptl1, page, tgt) { \
69	SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \	69	SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
70	SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	70	SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
71	}	71	}
72	#define SETUP_PTL3(ptl2, page, tgt) { \	72	#define SETUP_PTL3(ptl2, page, tgt) { \
73	SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \	73	SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
74	SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	74	SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
75	}	75	}
76	#define SETUP_FRAME(ptl3, page, tgt) { \	76	#define SETUP_FRAME(ptl3, page, tgt) { \
77	SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \	77	SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
78	SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \	78	SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE \| PAGE_EXEC); \
79	}	79	}
80		80
81		81
82	void page_arch_init(void)	82	void page_arch_init(void)
83	{	83	{
84	uintptr_t cur;	84	uintptr_t cur;
85	int i;	85	int i;
86	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL;	86	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL;
87		87
88	if (config.cpu_active == 1) {	88	if (config.cpu_active == 1) {
89	page_mapping_operations = &pt_mapping_operations;	89	page_mapping_operations = &pt_mapping_operations;
90		90
91	/*	91	/*
92	* PA2KA(identity) mapping for all frames.	92	* PA2KA(identity) mapping for all frames.
93	*/	93	*/
94	for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {	94	for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
95	/* Standard identity mapping */	95	/* Standard identity mapping */
96	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);	96	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
97	}	97	}
98	/* Upper kernel mapping	98	/* Upper kernel mapping
99	* - from zero to top of kernel (include bottom addresses	99	* - from zero to top of kernel (include bottom addresses
100	* because some are needed for init )	100	* because some are needed for init )
101	*/	101	*/
102	for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)	102	for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)
103	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);	103	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
104		104
105	for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)	105	for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)
106	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);	106	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
107		107
108	for (i = 0; i < init.cnt; i++) {	108	for (i = 0; i < init.cnt; i++) {
109	for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)	109	for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)
110	page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);	110	page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
111	}	111	}
112		112
113	exc_register(14, "page_fault", (iroutine) page_fault);	113	exc_register(14, "page_fault", (iroutine) page_fault);
114	write_cr3((uintptr_t) AS_KERNEL->page_table);	114	write_cr3((uintptr_t) AS_KERNEL->page_table);
115	}	115	}
116	else {	116	else {
117	write_cr3((uintptr_t) AS_KERNEL->page_table);	117	write_cr3((uintptr_t) AS_KERNEL->page_table);
118	}	118	}
119	}	119	}
120		120
121		121
122	/** Identity page mapper	122	/** Identity page mapper
123	*	123	*
124	* We need to map whole physical memory identically before the page subsystem	124	* We need to map whole physical memory identically before the page subsystem
125	* is initializaed. This thing clears page table and fills in the specific	125	* is initializaed. This thing clears page table and fills in the specific
126	* items.	126	* items.
127	*/	127	*/
128	void ident_page_fault(int n, istate_t *istate)	128	void ident_page_fault(int n, istate_t *istate)
129	{	129	{
130	uintptr_t page;	130	uintptr_t page;
131	static uintptr_t oldpage = 0;	131	static uintptr_t oldpage = 0;
132	pte_t aptl_1, aptl_2, *aptl_3;	132	pte_t aptl_1, aptl_2, *aptl_3;
133		133
134	page = read_cr2();	134	page = read_cr2();
135	if (oldpage) {	135	if (oldpage) {
136	/* Unmap old address */	136	/* Unmap old address */
137	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);	137	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
138	aptl_2 = PTL2_ADDR(aptl_1, oldpage);	138	aptl_2 = PTL2_ADDR(aptl_1, oldpage);
139	aptl_3 = PTL3_ADDR(aptl_2, oldpage);	139	aptl_3 = PTL3_ADDR(aptl_2, oldpage);
140		140
141	SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	141	SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
142	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))	142	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
143	SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	143	SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
144	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))	144	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
145	SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	145	SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
146	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))	146	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
147	SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	147	SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
148	}	148	}
149	if (PTL1_PRESENT(&ptl_0, page))	149	if (PTL1_PRESENT(&ptl_0, page))
150	aptl_1 = PTL1_ADDR(&ptl_0, page);	150	aptl_1 = PTL1_ADDR(&ptl_0, page);
151	else {	151	else {
152	SETUP_PTL1(&ptl_0, page, helper_ptl1);	152	SETUP_PTL1(&ptl_0, page, helper_ptl1);
153	aptl_1 = helper_ptl1;	153	aptl_1 = helper_ptl1;
154	}	154	}
155		155
156	if (PTL2_PRESENT(aptl_1, page))	156	if (PTL2_PRESENT(aptl_1, page))
157	aptl_2 = PTL2_ADDR(aptl_1, page);	157	aptl_2 = PTL2_ADDR(aptl_1, page);
158	else {	158	else {
159	SETUP_PTL2(aptl_1, page, helper_ptl2);	159	SETUP_PTL2(aptl_1, page, helper_ptl2);
160	aptl_2 = helper_ptl2;	160	aptl_2 = helper_ptl2;
161	}	161	}
162		162
163	if (PTL3_PRESENT(aptl_2, page))	163	if (PTL3_PRESENT(aptl_2, page))
164	aptl_3 = PTL3_ADDR(aptl_2, page);	164	aptl_3 = PTL3_ADDR(aptl_2, page);
165	else {	165	else {
166	SETUP_PTL3(aptl_2, page, helper_ptl3);	166	SETUP_PTL3(aptl_2, page, helper_ptl3);
167	aptl_3 = helper_ptl3;	167	aptl_3 = helper_ptl3;
168	}	168	}
169		169
170	SETUP_FRAME(aptl_3, page, page);	170	SETUP_FRAME(aptl_3, page, page);
171		171
172	oldpage = page;	172	oldpage = page;
173	}	173	}
174		174
175		175
176	void page_fault(int n, istate_t *istate)	176	void page_fault(int n, istate_t *istate)
177	{	177	{
178	uintptr_t page;	178	uintptr_t page;
179	pf_access_t access;	179	pf_access_t access;
180		180
181	page = read_cr2();	181	page = read_cr2();
182		182
183	if (istate->error_word & PFERR_CODE_RSVD)	183	if (istate->error_word & PFERR_CODE_RSVD)
184	panic("Reserved bit set in page table entry.\n");	184	panic("Reserved bit set in page table entry.\n");
185		185
186	if (istate->error_word & PFERR_CODE_RW)	186	if (istate->error_word & PFERR_CODE_RW)
187	access = PF_ACCESS_WRITE;	187	access = PF_ACCESS_WRITE;
188	else if (istate->error_word & PFERR_CODE_ID)	188	else if (istate->error_word & PFERR_CODE_ID)
189	access = PF_ACCESS_EXEC;	189	access = PF_ACCESS_EXEC;
190	else	190	else
191	access = PF_ACCESS_READ;	191	access = PF_ACCESS_READ;
192		192
193	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {	193	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
194	fault_if_from_uspace(istate, "Page fault: %#x", page);	194	fault_if_from_uspace(istate, "Page fault: %#x", page);
195		195
196	decode_istate(n, istate);	196	decode_istate(n, istate);
197	printf("Page fault address: %llx\n", page);	197	printf("Page fault address: %llx\n", page);
198	panic("page fault\n");	198	panic("page fault\n");
199	}	199	}
200	}	200	}
201		201
202		202
203	uintptr_t hw_map(uintptr_t physaddr, size_t size)	203	uintptr_t hw_map(uintptr_t physaddr, size_t size)
204	{	204	{
205	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))	205	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
206	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)	206	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
207		207
208	uintptr_t virtaddr = PA2KA(last_frame);	208	uintptr_t virtaddr = PA2KA(last_frame);
209	pfn_t i;	209	pfn_t i;
210	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	210	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
211	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);	211	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
212		212
213	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	213	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
214		214
215	return virtaddr;	215	return virtaddr;
216	}	216	}
217		217
218	/** @}	218	/** @}
219	*/	219	*/
220		220