WebSVN – HelenOS – Diff – /trunk/kernel/generic/include/mm/as.h


/*
 * 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 genericmm
 * @{
 */
/** @file
 */
 
#ifndef KERN_AS_H_
#define KERN_AS_H_
 
/** Address space area flags. */
#define AS_AREA_READ        1
#define AS_AREA_WRITE       2
#define AS_AREA_EXEC        4
#define AS_AREA_CACHEABLE   8
 
#ifdef KERNEL
 
#include <arch/mm/page.h>
#include <arch/mm/as.h>
#include <arch/mm/asid.h>
#include <arch/types.h>
#include <typedefs.h>
#include <synch/spinlock.h>
#include <synch/mutex.h>
#include <adt/list.h>
#include <adt/btree.h>
#include <lib/elf.h>
 
/** Defined to be true if user address space and kernel address space shadow each other. */
#define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
 
#define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
#define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
#define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
#define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
 
#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
 
#define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
 
/** Address space structure.
 *
 * as_t contains the list of as_areas of userspace accessible
 * pages for one or more tasks. Ranges of kernel memory pages are not
 * supposed to figure in the list as they are shared by all tasks and
 * set up during system initialization.
 */
struct as {
    /** Protected by asidlock. */
    link_t inactive_as_with_asid_link;
 
    mutex_t lock;
 
    /** Number of references (i.e tasks that reference this as). */
    count_t refcount;
 
    /** Number of processors on wich is this address space active. */
    count_t cpu_refcount;
 
    /** B+tree of address space areas. */
    btree_t as_area_btree;
 
    /** Page table pointer. Constant on architectures that use global page hash table. */
    pte_t *page_table;
 
    /** Address space identifier. Constant on architectures that do not support ASIDs.*/
    asid_t asid;
   
 
 
 
 
 
    /** Architecture specific content. */
    as_arch_t arch;
};
 
struct as_operations {
    pte_t *(* page_table_create)(int flags);
    void (* page_table_destroy)(pte_t *page_table);
    void (* page_table_lock)(as_t *as, bool lock);
    void (* page_table_unlock)(as_t *as, bool unlock);
};
typedef struct as_operations as_operations_t;
 
/** Address space area attributes. */
#define AS_AREA_ATTR_NONE   0
#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
 
#define AS_PF_FAULT     0   /**< The page fault was not resolved by as_page_fault(). */
#define AS_PF_OK        1   /**< The page fault was resolved by as_page_fault(). */
#define AS_PF_DEFER     2   /**< The page fault was caused by memcpy_from_uspace()
                         or memcpy_to_uspace(). */
 
/** This structure contains information associated with the shared address space area. */
typedef struct {
    mutex_t lock;       /**< This lock must be acquired only when the as_area lock is held. */
    count_t refcount;   /**< This structure can be deallocated if refcount drops to 0. */
    btree_t pagemap;    /**< B+tree containing complete map of anonymous pages of the shared area. */
} share_info_t;
 
/** Address space area backend structure. */
typedef struct {
    int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
    void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
    void (* share)(as_area_t *area);
} mem_backend_t;
 
/** Backend data stored in address space area. */
typedef union {
    struct {    /**< elf_backend members */
        elf_header_t *elf;
        elf_segment_header_t *segment;
    };
    struct {    /**< phys_backend members */
        uintptr_t base;
        count_t frames;
    };
} mem_backend_data_t;
 
/** Address space area structure.
 *
 * Each as_area_t structure describes one contiguous area of virtual memory.
 * In the future, it should not be difficult to support shared areas.
 */
struct as_area {
    mutex_t lock;
    as_t *as;       /**< Containing address space. */
    int flags;      /**< Flags related to the memory represented by the address space area. */
    int attributes;     /**< Attributes related to the address space area itself. */
    count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
    uintptr_t base;     /**< Base address of this area. */
    btree_t used_space; /**< Map of used space. */
    share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
                         reference the share info structure. */
    mem_backend_t *backend; /**< Memory backend backing this address space area. */
 
    /** Data to be used by the backend. */
    mem_backend_data_t backend_data;
 
 
 
 
 
 
};
 
extern as_t *AS_KERNEL;
extern as_operations_t *as_operations;
 
extern spinlock_t inactive_as_with_asid_lock;
extern link_t inactive_as_with_asid_head;
 
extern void as_init(void);
 
extern as_t *as_create(int flags);
extern void as_destroy(as_t *as);
extern void as_switch(as_t *old, as_t *new);
extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
 
extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs,
    mem_backend_t *backend, mem_backend_data_t *backend_data);
extern int as_area_destroy(as_t *as, uintptr_t address);   
extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
          as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
 
extern int as_area_get_flags(as_area_t *area);
extern bool as_area_check_access(as_area_t *area, pf_access_t access);
extern size_t as_get_size(uintptr_t base);
extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
 
 
/* Interface to be implemented by architectures. */
#ifndef as_constructor_arch
extern int as_constructor_arch(as_t *as, int flags);
#endif /* !def as_constructor_arch */
#ifndef as_destructor_arch
extern int as_destructor_arch(as_t *as);
#endif /* !def as_destructor_arch */
#ifndef as_create_arch
extern int as_create_arch(as_t *as, int flags);
#endif /* !def as_create_arch */
#ifndef as_install_arch
extern void as_install_arch(as_t *as);
#endif /* !def as_install_arch */
#ifndef as_deinstall_arch
extern void as_deinstall_arch(as_t *as);
#endif /* !def as_deinstall_arch */
 
/* Backend declarations. */
extern mem_backend_t anon_backend;
extern mem_backend_t elf_backend;
extern mem_backend_t phys_backend;
 
/* Address space area related syscalls. */
extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
extern unative_t sys_as_area_destroy(uintptr_t address);
 
/* Introspection functions. */
extern void as_print(as_t *as);
 
#endif /* KERNEL */
 
#endif
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/include/mm/as.h @ 4055 – Rev 2009 → 2015

Rev 2009		Rev 2015
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 genericmm	29	/** @addtogroup genericmm
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef KERN_AS_H_	35	#ifndef KERN_AS_H_
36	#define KERN_AS_H_	36	#define KERN_AS_H_
37		37
38	/** Address space area flags. */	38	/** Address space area flags. */
39	#define AS_AREA_READ 1	39	#define AS_AREA_READ 1
40	#define AS_AREA_WRITE 2	40	#define AS_AREA_WRITE 2
41	#define AS_AREA_EXEC 4	41	#define AS_AREA_EXEC 4
42	#define AS_AREA_CACHEABLE 8	42	#define AS_AREA_CACHEABLE 8
43		43
44	#ifdef KERNEL	44	#ifdef KERNEL
45		45
46	#include <arch/mm/page.h>	46	#include <arch/mm/page.h>
47	#include <arch/mm/as.h>	47	#include <arch/mm/as.h>
48	#include <arch/mm/asid.h>	48	#include <arch/mm/asid.h>
49	#include <arch/types.h>	49	#include <arch/types.h>
50	#include <typedefs.h>	50	#include <typedefs.h>
51	#include <synch/spinlock.h>	51	#include <synch/spinlock.h>
52	#include <synch/mutex.h>	52	#include <synch/mutex.h>
53	#include <adt/list.h>	53	#include <adt/list.h>
54	#include <adt/btree.h>	54	#include <adt/btree.h>
55	#include <lib/elf.h>	55	#include <lib/elf.h>
56		56
57	/** Defined to be true if user address space and kernel address space shadow each other. */	57	/** Defined to be true if user address space and kernel address space shadow each other. */
58	#define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH	58	#define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
59		59
60	#define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH	60	#define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH
61	#define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH	61	#define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH
62	#define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH	62	#define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH
63	#define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH	63	#define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH
64		64
65	#define USTACK_ADDRESS USTACK_ADDRESS_ARCH	65	#define USTACK_ADDRESS USTACK_ADDRESS_ARCH
66		66
67	#define FLAG_AS_KERNEL (1 << 0) /*< Kernel address space. /	67	#define FLAG_AS_KERNEL (1 << 0) /*< Kernel address space. /
68		68
69	/** Address space structure.	69	/** Address space structure.
70	*	70	*
71	* as_t contains the list of as_areas of userspace accessible	71	* as_t contains the list of as_areas of userspace accessible
72	* pages for one or more tasks. Ranges of kernel memory pages are not	72	* pages for one or more tasks. Ranges of kernel memory pages are not
73	* supposed to figure in the list as they are shared by all tasks and	73	* supposed to figure in the list as they are shared by all tasks and
74	* set up during system initialization.	74	* set up during system initialization.
75	*/	75	*/
76	struct as {	76	struct as {
77	/** Protected by asidlock. */	77	/** Protected by asidlock. */
78	link_t inactive_as_with_asid_link;	78	link_t inactive_as_with_asid_link;
79		79
80	mutex_t lock;	80	mutex_t lock;
81		81
82	/** Number of references (i.e tasks that reference this as). */	82	/** Number of references (i.e tasks that reference this as). */
83	count_t refcount;	83	count_t refcount;
84		84
85	/** Number of processors on wich is this address space active. */	85	/** Number of processors on wich is this address space active. */
86	count_t cpu_refcount;	86	count_t cpu_refcount;
87		87
88	/** B+tree of address space areas. */	88	/** B+tree of address space areas. */
89	btree_t as_area_btree;	89	btree_t as_area_btree;
90		90
91	/** Page table pointer. Constant on architectures that use global page hash table. */	91	/** Page table pointer. Constant on architectures that use global page hash table. */
92	pte_t *page_table;	92	pte_t *page_table;
93		93
94	/** Address space identifier. Constant on architectures that do not support ASIDs.*/	94	/** Address space identifier. Constant on architectures that do not support ASIDs.*/
95	asid_t asid;	95	asid_t asid;
96		96
97	#ifdef CONFIG_VIRT_IDX_DCACHE	-
98	bool dcache_flush_on_install;	-
99	bool dcache_flush_on_deinstall;	-
100	#endif /* CONFIG_VIRT_IDX_DCACHE */	-
101		-
102	/** Architecture specific content. */	97	/** Architecture specific content. */
103	as_arch_t arch;	98	as_arch_t arch;
104	};	99	};
105		100
106	struct as_operations {	101	struct as_operations {
107	pte_t ( page_table_create)(int flags);	102	pte_t ( page_table_create)(int flags);
108	void (* page_table_destroy)(pte_t *page_table);	103	void (* page_table_destroy)(pte_t *page_table);
109	void (* page_table_lock)(as_t *as, bool lock);	104	void (* page_table_lock)(as_t *as, bool lock);
110	void (* page_table_unlock)(as_t *as, bool unlock);	105	void (* page_table_unlock)(as_t *as, bool unlock);
111	};	106	};
112	typedef struct as_operations as_operations_t;	107	typedef struct as_operations as_operations_t;
113		108
114	/** Address space area attributes. */	109	/** Address space area attributes. */
115	#define AS_AREA_ATTR_NONE 0	110	#define AS_AREA_ATTR_NONE 0
116	#define AS_AREA_ATTR_PARTIAL 1 /*< Not fully initialized area. /	111	#define AS_AREA_ATTR_PARTIAL 1 /*< Not fully initialized area. /
117		112
118	#define AS_PF_FAULT 0 /*< The page fault was not resolved by as_page_fault(). /	113	#define AS_PF_FAULT 0 /*< The page fault was not resolved by as_page_fault(). /
119	#define AS_PF_OK 1 /*< The page fault was resolved by as_page_fault(). /	114	#define AS_PF_OK 1 /*< The page fault was resolved by as_page_fault(). /
120	#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace()	115	#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace()
121	or memcpy_to_uspace(). */	116	or memcpy_to_uspace(). */
122		117
123	/** This structure contains information associated with the shared address space area. */	118	/** This structure contains information associated with the shared address space area. */
124	typedef struct {	119	typedef struct {
125	mutex_t lock; /*< This lock must be acquired only when the as_area lock is held. /	120	mutex_t lock; /*< This lock must be acquired only when the as_area lock is held. /
126	count_t refcount; /*< This structure can be deallocated if refcount drops to 0. /	121	count_t refcount; /*< This structure can be deallocated if refcount drops to 0. /
127	btree_t pagemap; /*< B+tree containing complete map of anonymous pages of the shared area. /	122	btree_t pagemap; /*< B+tree containing complete map of anonymous pages of the shared area. /
128	} share_info_t;	123	} share_info_t;
129		124
130	/** Address space area backend structure. */	125	/** Address space area backend structure. */
131	typedef struct {	126	typedef struct {
132	int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);	127	int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
133	void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);	128	void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
134	void (* share)(as_area_t *area);	129	void (* share)(as_area_t *area);
135	} mem_backend_t;	130	} mem_backend_t;
136		131
137	/** Backend data stored in address space area. */	132	/** Backend data stored in address space area. */
138	typedef union {	133	typedef union {
139	struct { /*< elf_backend members /	134	struct { /*< elf_backend members /
140	elf_header_t *elf;	135	elf_header_t *elf;
141	elf_segment_header_t *segment;	136	elf_segment_header_t *segment;
142	};	137	};
143	struct { /*< phys_backend members /	138	struct { /*< phys_backend members /
144	uintptr_t base;	139	uintptr_t base;
145	count_t frames;	140	count_t frames;
146	};	141	};
147	} mem_backend_data_t;	142	} mem_backend_data_t;
148		143
149	/** Address space area structure.	144	/** Address space area structure.
150	*	145	*
151	* Each as_area_t structure describes one contiguous area of virtual memory.	146	* Each as_area_t structure describes one contiguous area of virtual memory.
152	* In the future, it should not be difficult to support shared areas.	147	* In the future, it should not be difficult to support shared areas.
153	*/	148	*/
154	struct as_area {	149	struct as_area {
155	mutex_t lock;	150	mutex_t lock;
156	as_t as; /< Containing address space. /	151	as_t as; /< Containing address space. /
157	int flags; /*< Flags related to the memory represented by the address space area. /	152	int flags; /*< Flags related to the memory represented by the address space area. /
158	int attributes; /*< Attributes related to the address space area itself. /	153	int attributes; /*< Attributes related to the address space area itself. /
159	count_t pages; /*< Size of this area in multiples of PAGE_SIZE. /	154	count_t pages; /*< Size of this area in multiples of PAGE_SIZE. /
160	uintptr_t base; /*< Base address of this area. /	155	uintptr_t base; /*< Base address of this area. /
161	btree_t used_space; /*< Map of used space. /	156	btree_t used_space; /*< Map of used space. /
162	share_info_t sh_info; /*< If the address space area has been shared, this pointer will	157	share_info_t sh_info; /*< If the address space area has been shared, this pointer will
163	reference the share info structure. */	158	reference the share info structure. */
164	mem_backend_t backend; /< Memory backend backing this address space area. /	159	mem_backend_t backend; /< Memory backend backing this address space area. /
165		160
166	/** Data to be used by the backend. */	161	/** Data to be used by the backend. */
167	mem_backend_data_t backend_data;	162	mem_backend_data_t backend_data;
168		-
169	/**	-
170	* Virtual color of the original address space area that was at the beginning	-
171	* of the share chain.	-
172	*/	-
173	int orig_color;	-
174	};	163	};
175		164
176	extern as_t *AS_KERNEL;	165	extern as_t *AS_KERNEL;
177	extern as_operations_t *as_operations;	166	extern as_operations_t *as_operations;
178		167
179	extern spinlock_t inactive_as_with_asid_lock;	168	extern spinlock_t inactive_as_with_asid_lock;
180	extern link_t inactive_as_with_asid_head;	169	extern link_t inactive_as_with_asid_head;
181		170
182	extern void as_init(void);	171	extern void as_init(void);
183		172
184	extern as_t *as_create(int flags);	173	extern as_t *as_create(int flags);
185	extern void as_destroy(as_t *as);	174	extern void as_destroy(as_t *as);
186	extern void as_switch(as_t old, as_t new);	175	extern void as_switch(as_t old, as_t new);
187	extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);	176	extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
188		177
189	extern as_area_t as_area_create(as_t as, int flags, size_t size, uintptr_t base, int attrs,	178	extern as_area_t as_area_create(as_t as, int flags, size_t size, uintptr_t base, int attrs,
190	mem_backend_t backend, mem_backend_data_t backend_data);	179	mem_backend_t backend, mem_backend_data_t backend_data);
191	extern int as_area_destroy(as_t *as, uintptr_t address);	180	extern int as_area_destroy(as_t *as, uintptr_t address);
192	extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);	181	extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
193	int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,	182	int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
194	as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);	183	as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
195		184
196	extern int as_area_get_flags(as_area_t *area);	185	extern int as_area_get_flags(as_area_t *area);
197	extern bool as_area_check_access(as_area_t *area, pf_access_t access);	186	extern bool as_area_check_access(as_area_t *area, pf_access_t access);
198	extern size_t as_get_size(uintptr_t base);	187	extern size_t as_get_size(uintptr_t base);
199	extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);	188	extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
200	extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);	189	extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
201		190
202		191
203	/* Interface to be implemented by architectures. */	192	/* Interface to be implemented by architectures. */
204	#ifndef as_constructor_arch	193	#ifndef as_constructor_arch
205	extern int as_constructor_arch(as_t *as, int flags);	194	extern int as_constructor_arch(as_t *as, int flags);
206	#endif /* !def as_constructor_arch */	195	#endif /* !def as_constructor_arch */
207	#ifndef as_destructor_arch	196	#ifndef as_destructor_arch
208	extern int as_destructor_arch(as_t *as);	197	extern int as_destructor_arch(as_t *as);
209	#endif /* !def as_destructor_arch */	198	#endif /* !def as_destructor_arch */
210	#ifndef as_create_arch	199	#ifndef as_create_arch
211	extern int as_create_arch(as_t *as, int flags);	200	extern int as_create_arch(as_t *as, int flags);
212	#endif /* !def as_create_arch */	201	#endif /* !def as_create_arch */
213	#ifndef as_install_arch	202	#ifndef as_install_arch
214	extern void as_install_arch(as_t *as);	203	extern void as_install_arch(as_t *as);
215	#endif /* !def as_install_arch */	204	#endif /* !def as_install_arch */
216	#ifndef as_deinstall_arch	205	#ifndef as_deinstall_arch
217	extern void as_deinstall_arch(as_t *as);	206	extern void as_deinstall_arch(as_t *as);
218	#endif /* !def as_deinstall_arch */	207	#endif /* !def as_deinstall_arch */
219		208
220	/* Backend declarations. */	209	/* Backend declarations. */
221	extern mem_backend_t anon_backend;	210	extern mem_backend_t anon_backend;
222	extern mem_backend_t elf_backend;	211	extern mem_backend_t elf_backend;
223	extern mem_backend_t phys_backend;	212	extern mem_backend_t phys_backend;
224		213
225	/* Address space area related syscalls. */	214	/* Address space area related syscalls. */
226	extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);	215	extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
227	extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);	216	extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
228	extern unative_t sys_as_area_destroy(uintptr_t address);	217	extern unative_t sys_as_area_destroy(uintptr_t address);
229		218
230	/* Introspection functions. */	219	/* Introspection functions. */
231	extern void as_print(as_t *as);	220	extern void as_print(as_t *as);
232		221
233	#endif /* KERNEL */	222	#endif /* KERNEL */
234		223
235	#endif	224	#endif
236		225
237	/** @}	226	/** @}
238	*/	227	*/
239		228