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;
    unsigned int i;
    int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL | PAGE_WRITE;
 
    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->genarch.page_table);
    } else
        write_cr3((uintptr_t) AS_KERNEL->genarch.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.");
   
    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.");
    }
}
 
 
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 | PAGE_WRITE);
   
    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
   
    return virtaddr;
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/amd64/src/mm/page.c – Rev 3788 → 3790

Rev 3788		Rev 3790
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	unsigned int i;	85	unsigned int i;
86	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL \| PAGE_WRITE;	86	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL \| PAGE_WRITE;
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		98
99	/* Upper kernel mapping	99	/* Upper kernel mapping
100	* - from zero to top of kernel (include bottom addresses	100	* - from zero to top of kernel (include bottom addresses
101	* because some are needed for init)	101	* because some are needed for init)
102	*/	102	*/
103	for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)	103	for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)
104	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);	104	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
105		105
106	for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)	106	for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)
107	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);	107	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
108		108
109	for (i = 0; i < init.cnt; i++) {	109	for (i = 0; i < init.cnt; i++) {
110	for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)	110	for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)
111	page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);	111	page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
112	}	112	}
113		113
114	exc_register(14, "page_fault", (iroutine) page_fault);	114	exc_register(14, "page_fault", (iroutine) page_fault);
115	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);	115	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
116	} else	116	} else
117	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);	117	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
118	}	118	}
119		119
120		120
121	/** Identity page mapper	121	/** Identity page mapper
122	*	122	*
123	* We need to map whole physical memory identically before the page subsystem	123	* We need to map whole physical memory identically before the page subsystem
124	* is initializaed. This thing clears page table and fills in the specific	124	* is initializaed. This thing clears page table and fills in the specific
125	* items.	125	* items.
126	*/	126	*/
127	void ident_page_fault(int n, istate_t *istate)	127	void ident_page_fault(int n, istate_t *istate)
128	{	128	{
129	uintptr_t page;	129	uintptr_t page;
130	static uintptr_t oldpage = 0;	130	static uintptr_t oldpage = 0;
131	pte_t aptl_1, aptl_2, *aptl_3;	131	pte_t aptl_1, aptl_2, *aptl_3;
132		132
133	page = read_cr2();	133	page = read_cr2();
134	if (oldpage) {	134	if (oldpage) {
135	/* Unmap old address */	135	/* Unmap old address */
136	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);	136	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
137	aptl_2 = PTL2_ADDR(aptl_1, oldpage);	137	aptl_2 = PTL2_ADDR(aptl_1, oldpage);
138	aptl_3 = PTL3_ADDR(aptl_2, oldpage);	138	aptl_3 = PTL3_ADDR(aptl_2, oldpage);
139		139
140	SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	140	SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
141	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))	141	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
142	SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	142	SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
143	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))	143	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
144	SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	144	SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
145	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))	145	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
146	SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);	146	SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
147	}	147	}
148	if (PTL1_PRESENT(&ptl_0, page))	148	if (PTL1_PRESENT(&ptl_0, page))
149	aptl_1 = PTL1_ADDR(&ptl_0, page);	149	aptl_1 = PTL1_ADDR(&ptl_0, page);
150	else {	150	else {
151	SETUP_PTL1(&ptl_0, page, helper_ptl1);	151	SETUP_PTL1(&ptl_0, page, helper_ptl1);
152	aptl_1 = helper_ptl1;	152	aptl_1 = helper_ptl1;
153	}	153	}
154		154
155	if (PTL2_PRESENT(aptl_1, page))	155	if (PTL2_PRESENT(aptl_1, page))
156	aptl_2 = PTL2_ADDR(aptl_1, page);	156	aptl_2 = PTL2_ADDR(aptl_1, page);
157	else {	157	else {
158	SETUP_PTL2(aptl_1, page, helper_ptl2);	158	SETUP_PTL2(aptl_1, page, helper_ptl2);
159	aptl_2 = helper_ptl2;	159	aptl_2 = helper_ptl2;
160	}	160	}
161		161
162	if (PTL3_PRESENT(aptl_2, page))	162	if (PTL3_PRESENT(aptl_2, page))
163	aptl_3 = PTL3_ADDR(aptl_2, page);	163	aptl_3 = PTL3_ADDR(aptl_2, page);
164	else {	164	else {
165	SETUP_PTL3(aptl_2, page, helper_ptl3);	165	SETUP_PTL3(aptl_2, page, helper_ptl3);
166	aptl_3 = helper_ptl3;	166	aptl_3 = helper_ptl3;
167	}	167	}
168		168
169	SETUP_FRAME(aptl_3, page, page);	169	SETUP_FRAME(aptl_3, page, page);
170		170
171	oldpage = page;	171	oldpage = page;
172	}	172	}
173		173
174		174
175	void page_fault(int n, istate_t *istate)	175	void page_fault(int n, istate_t *istate)
176	{	176	{
177	uintptr_t page;	177	uintptr_t page;
178	pf_access_t access;	178	pf_access_t access;
179		179
180	page = read_cr2();	180	page = read_cr2();
181		181
182	if (istate->error_word & PFERR_CODE_RSVD)	182	if (istate->error_word & PFERR_CODE_RSVD)
183	panic("Reserved bit set in page table entry.\n");	183	panic("Reserved bit set in page table entry.");
184		184
185	if (istate->error_word & PFERR_CODE_RW)	185	if (istate->error_word & PFERR_CODE_RW)
186	access = PF_ACCESS_WRITE;	186	access = PF_ACCESS_WRITE;
187	else if (istate->error_word & PFERR_CODE_ID)	187	else if (istate->error_word & PFERR_CODE_ID)
188	access = PF_ACCESS_EXEC;	188	access = PF_ACCESS_EXEC;
189	else	189	else
190	access = PF_ACCESS_READ;	190	access = PF_ACCESS_READ;
191		191
192	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {	192	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
193	fault_if_from_uspace(istate, "Page fault: %#x", page);	193	fault_if_from_uspace(istate, "Page fault: %#x.", page);
194		194
195	decode_istate(n, istate);	195	decode_istate(n, istate);
196	printf("Page fault address: %llx\n", page);	196	printf("Page fault address: %llx.\n", page);
197	panic("Page fault\n");	197	panic("Page fault.");
198	}	198	}
199	}	199	}
200		200
201		201
202	uintptr_t hw_map(uintptr_t physaddr, size_t size)	202	uintptr_t hw_map(uintptr_t physaddr, size_t size)
203	{	203	{
204	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))	204	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
205	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)	205	panic("Unable to map physical memory %p (%d bytes).", physaddr, size)
206		206
207	uintptr_t virtaddr = PA2KA(last_frame);	207	uintptr_t virtaddr = PA2KA(last_frame);
208	pfn_t i;	208	pfn_t i;
209	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	209	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
210	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE \| PAGE_WRITE);	210	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE \| PAGE_WRITE);
211		211
212	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	212	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
213		213
214	return virtaddr;	214	return virtaddr;
215	}	215	}
216		216
217	/** @}	217	/** @}
218	*/	218	*/
219		219