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 @ 3788 – Rev 3940 → 3973

Rev 3940		Rev 3973
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 <genarch/drivers/ega/ega.h>	-
38	#include <genarch/drivers/legacy/ia32/io.h>	-
39	#include <arch/mm/frame.h>	37	#include <arch/mm/frame.h>
40	#include <mm/page.h>	38	#include <mm/page.h>
41	#include <mm/frame.h>	39	#include <mm/frame.h>
42	#include <mm/as.h>	40	#include <mm/as.h>
43	#include <arch/interrupt.h>	41	#include <arch/interrupt.h>
44	#include <arch/asm.h>	42	#include <arch/asm.h>
45	#include <config.h>	43	#include <config.h>
46	#include <memstr.h>	44	#include <memstr.h>
47	#include <interrupt.h>	45	#include <interrupt.h>
48	#include <print.h>	46	#include <print.h>
49	#include <panic.h>	47	#include <panic.h>
50	#include <align.h>	48	#include <align.h>
51	#include <ddi/ddi.h>	-
52		-
53	/** Physical memory area for devices. */	-
54	static parea_t dev_area;	-
55	static parea_t ega_area;	-
56		49
57	/* Definitions for identity page mapper */	50	/* Definitions for identity page mapper */
58	pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));	51	pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
59	pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));	52	pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
60	pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));	53	pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
61	extern pte_t ptl_0; /* From boot.S */	54	extern pte_t ptl_0; /* From boot.S */
62		55
63	#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))
64	#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))
65	#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))
66		59
67	#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))))
68	#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))))
69	#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))))
70		63
71	#define SETUP_PTL1(ptl0, page, tgt) { \	64	#define SETUP_PTL1(ptl0, page, tgt) { \
72	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)); \
73	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); \
74	}	67	}
75	#define SETUP_PTL2(ptl1, page, tgt) { \	68	#define SETUP_PTL2(ptl1, page, tgt) { \
76	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)); \
77	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); \
78	}	71	}
79	#define SETUP_PTL3(ptl2, page, tgt) { \	72	#define SETUP_PTL3(ptl2, page, tgt) { \
80	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)); \
81	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); \
82	}	75	}
83	#define SETUP_FRAME(ptl3, page, tgt) { \	76	#define SETUP_FRAME(ptl3, page, tgt) { \
84	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)); \
85	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); \
86	}	79	}
87		80
88		81
89	void page_arch_init(void)	82	void page_arch_init(void)
90	{	83	{
91	uintptr_t cur;	84	uintptr_t cur;
92	unsigned int i;	85	unsigned int i;
93	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL \| PAGE_WRITE;	86	int identity_flags = PAGE_CACHEABLE \| PAGE_EXEC \| PAGE_GLOBAL \| PAGE_WRITE;
94		87
95	if (config.cpu_active == 1) {	88	if (config.cpu_active == 1) {
96	page_mapping_operations = &pt_mapping_operations;	89	page_mapping_operations = &pt_mapping_operations;
97		90
98	/*	91	/*
99	* PA2KA(identity) mapping for all frames.	92	* PA2KA(identity) mapping for all frames.
100	*/	93	*/
101	for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {	94	for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
102	/* Standard identity mapping */	95	/* Standard identity mapping */
103	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);	96	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
104	}	97	}
105		98
106	/* Upper kernel mapping	99	/* Upper kernel mapping
107	* - from zero to top of kernel (include bottom addresses	100	* - from zero to top of kernel (include bottom addresses
108	* because some are needed for init)	101	* because some are needed for init)
109	*/	102	*/
110	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)
111	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);	104	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
112		105
113	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)
114	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);	107	page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
115		108
116	for (i = 0; i < init.cnt; i++) {	109	for (i = 0; i < init.cnt; i++) {
117	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)
118	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);
119	}	112	}
120		113
121	exc_register(14, "page_fault", (iroutine) page_fault);	114	exc_register(14, "page_fault", (iroutine) page_fault);
122	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);	115	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
123	} else	116	} else
124	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);	117	write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
125	}	118	}
126		119
127		120
128	/** Identity page mapper	121	/** Identity page mapper
129	*	122	*
130	* 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
131	* 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
132	* items.	125	* items.
133	*/	126	*/
134	void ident_page_fault(int n, istate_t *istate)	127	void ident_page_fault(int n, istate_t *istate)
135	{	128	{
136	uintptr_t page;	129	uintptr_t page;
137	static uintptr_t oldpage = 0;	130	static uintptr_t oldpage = 0;
138	pte_t aptl_1, aptl_2, *aptl_3;	131	pte_t aptl_1, aptl_2, *aptl_3;
139		132
140	page = read_cr2();	133	page = read_cr2();
141	if (oldpage) {	134	if (oldpage) {
142	/* Unmap old address */	135	/* Unmap old address */
143	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);	136	aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
144	aptl_2 = PTL2_ADDR(aptl_1, oldpage);	137	aptl_2 = PTL2_ADDR(aptl_1, oldpage);
145	aptl_3 = PTL3_ADDR(aptl_2, oldpage);	138	aptl_3 = PTL3_ADDR(aptl_2, oldpage);
146		139
147	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);
148	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))	141	if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
149	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);
150	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))	143	if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
151	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);
152	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))	145	if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
153	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);
154	}	147	}
155	if (PTL1_PRESENT(&ptl_0, page))	148	if (PTL1_PRESENT(&ptl_0, page))
156	aptl_1 = PTL1_ADDR(&ptl_0, page);	149	aptl_1 = PTL1_ADDR(&ptl_0, page);
157	else {	150	else {
158	SETUP_PTL1(&ptl_0, page, helper_ptl1);	151	SETUP_PTL1(&ptl_0, page, helper_ptl1);
159	aptl_1 = helper_ptl1;	152	aptl_1 = helper_ptl1;
160	}	153	}
161		154
162	if (PTL2_PRESENT(aptl_1, page))	155	if (PTL2_PRESENT(aptl_1, page))
163	aptl_2 = PTL2_ADDR(aptl_1, page);	156	aptl_2 = PTL2_ADDR(aptl_1, page);
164	else {	157	else {
165	SETUP_PTL2(aptl_1, page, helper_ptl2);	158	SETUP_PTL2(aptl_1, page, helper_ptl2);
166	aptl_2 = helper_ptl2;	159	aptl_2 = helper_ptl2;
167	}	160	}
168		161
169	if (PTL3_PRESENT(aptl_2, page))	162	if (PTL3_PRESENT(aptl_2, page))
170	aptl_3 = PTL3_ADDR(aptl_2, page);	163	aptl_3 = PTL3_ADDR(aptl_2, page);
171	else {	164	else {
172	SETUP_PTL3(aptl_2, page, helper_ptl3);	165	SETUP_PTL3(aptl_2, page, helper_ptl3);
173	aptl_3 = helper_ptl3;	166	aptl_3 = helper_ptl3;
174	}	167	}
175		168
176	SETUP_FRAME(aptl_3, page, page);	169	SETUP_FRAME(aptl_3, page, page);
177		170
178	oldpage = page;	171	oldpage = page;
179	}	172	}
180		173
181		174
182	void page_fault(int n, istate_t *istate)	175	void page_fault(int n, istate_t *istate)
183	{	176	{
184	uintptr_t page;	177	uintptr_t page;
185	pf_access_t access;	178	pf_access_t access;
186		179
187	page = read_cr2();	180	page = read_cr2();
188		181
189	if (istate->error_word & PFERR_CODE_RSVD)	182	if (istate->error_word & PFERR_CODE_RSVD)
190	panic("Reserved bit set in page table entry.");	183	panic("Reserved bit set in page table entry.");
191		184
192	if (istate->error_word & PFERR_CODE_RW)	185	if (istate->error_word & PFERR_CODE_RW)
193	access = PF_ACCESS_WRITE;	186	access = PF_ACCESS_WRITE;
194	else if (istate->error_word & PFERR_CODE_ID)	187	else if (istate->error_word & PFERR_CODE_ID)
195	access = PF_ACCESS_EXEC;	188	access = PF_ACCESS_EXEC;
196	else	189	else
197	access = PF_ACCESS_READ;	190	access = PF_ACCESS_READ;
198		191
199	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {	192	if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
200	fault_if_from_uspace(istate, "Page fault: %#x.", page);	193	fault_if_from_uspace(istate, "Page fault: %#x.", page);
201		194
202	decode_istate(n, istate);	195	decode_istate(n, istate);
203	printf("Page fault address: %llx.\n", page);	196	printf("Page fault address: %llx.\n", page);
204	panic("Page fault.");	197	panic("Page fault.");
205	}	198	}
206	}	199	}
207		200
208		201
209	uintptr_t hw_map(uintptr_t physaddr, size_t size)	202	uintptr_t hw_map(uintptr_t physaddr, size_t size)
210	{	203	{
211	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))
212	panic("Unable to map physical memory %p (%d bytes).", physaddr, size)	205	panic("Unable to map physical memory %p (%d bytes).", physaddr, size)
213		206
214	uintptr_t virtaddr = PA2KA(last_frame);	207	uintptr_t virtaddr = PA2KA(last_frame);
215	pfn_t i;	208	pfn_t i;
216	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	209	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
217	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);
218		211
219	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	212	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
220		213
221	return virtaddr;	214	return virtaddr;
222	}	215	}
223		-
224	void hw_area(void)	-
225	{	-
226	dev_area.pbase = end_frame;	-
227	dev_area.frames = SIZE2FRAMES(0xfffffffffffff - end_frame);	-
228	ddi_parea_register(&dev_area);	-
229		-
230	ega_area.pbase = EGA_VIDEORAM;	-
231	ega_area.frames = SIZE2FRAMES(EGA_VRAM_SIZE);	-
232	ddi_parea_register(&ega_area);	-
233	}	-
234		216
235	/** @}	217	/** @}
236	*/	218	*/
237		219