WebSVN – HelenOS-historic – Diff – /kernel/trunk/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.
 */
 
#ifndef __AS_H__
#define __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 <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 IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
 
#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 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;
};
 
struct as_operations {
    pte_t *(* page_table_create)(int flags);
    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, __address addr, pf_access_t access);
    void (* frame_free)(as_area_t *area, __address page, __address 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 */
        __address 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. */
    __address 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 as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs,
    mem_backend_t *backend, mem_backend_data_t *backend_data);
extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
extern int as_area_destroy(as_t *as, __address address);
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 int as_page_fault(__address page, pf_access_t access, istate_t *istate);
extern void as_switch(as_t *old, as_t *new);
extern void as_free(as_t *as);
int as_area_share(as_t *src_as, __address src_base, size_t acc_size,
          as_t *dst_as, __address dst_base, int dst_flags_mask);
extern size_t as_get_size(__address base);
extern int used_space_insert(as_area_t *a, __address page, count_t count);
extern int used_space_remove(as_area_t *a, __address page, count_t count);
 
/* Interface to be implemented by architectures. */
#ifndef as_install_arch
extern void as_install_arch(as_t *as);
#endif /* !def as_install_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 __native sys_as_area_create(__address address, size_t size, int flags);
extern __native sys_as_area_resize(__address address, size_t size, int flags);
extern __native sys_as_area_destroy(__address address);
 
#endif /* KERNEL */
 
#endif
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/include/mm/as.h – Rev 1425 → 1428

Rev 1425		Rev 1428
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	#ifndef __AS_H__	29	#ifndef __AS_H__
30	#define __AS_H__	30	#define __AS_H__
31		31
32	/** Address space area flags. */	32	/** Address space area flags. */
33	#define AS_AREA_READ 1	33	#define AS_AREA_READ 1
34	#define AS_AREA_WRITE 2	34	#define AS_AREA_WRITE 2
35	#define AS_AREA_EXEC 4	35	#define AS_AREA_EXEC 4
36	#define AS_AREA_CACHEABLE 8	36	#define AS_AREA_CACHEABLE 8
37		37
38	#ifdef KERNEL	38	#ifdef KERNEL
39		39
40	#include <arch/mm/page.h>	40	#include <arch/mm/page.h>
41	#include <arch/mm/as.h>	41	#include <arch/mm/as.h>
42	#include <arch/mm/asid.h>	42	#include <arch/mm/asid.h>
43	#include <arch/types.h>	43	#include <arch/types.h>
44	#include <typedefs.h>	44	#include <typedefs.h>
45	#include <synch/spinlock.h>	45	#include <synch/spinlock.h>
46	#include <synch/mutex.h>	46	#include <synch/mutex.h>
47	#include <adt/list.h>	47	#include <adt/list.h>
48	#include <adt/btree.h>	48	#include <adt/btree.h>
49	#include <elf.h>	49	#include <elf.h>
50		50
51	/** Defined to be true if user address space and kernel address space shadow each other. */	51	/** Defined to be true if user address space and kernel address space shadow each other. */
52	#define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH	52	#define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
53		53
54	#define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH	54	#define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH
55	#define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH	55	#define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH
56	#define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH	56	#define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH
57	#define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH	57	#define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH
58		58
59	#define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)	59	#define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
60		60
61	#define USTACK_ADDRESS USTACK_ADDRESS_ARCH	61	#define USTACK_ADDRESS USTACK_ADDRESS_ARCH
62		62
63	#define FLAG_AS_KERNEL (1 << 0) /*< Kernel address space. /	63	#define FLAG_AS_KERNEL (1 << 0) /*< Kernel address space. /
64		64
65	/** Address space structure.	65	/** Address space structure.
66	*	66	*
67	* as_t contains the list of as_areas of userspace accessible	67	* as_t contains the list of as_areas of userspace accessible
68	* pages for one or more tasks. Ranges of kernel memory pages are not	68	* pages for one or more tasks. Ranges of kernel memory pages are not
69	* supposed to figure in the list as they are shared by all tasks and	69	* supposed to figure in the list as they are shared by all tasks and
70	* set up during system initialization.	70	* set up during system initialization.
71	*/	71	*/
72	struct as {	72	struct as {
73	/** Protected by asidlock. */	73	/** Protected by asidlock. */
74	link_t inactive_as_with_asid_link;	74	link_t inactive_as_with_asid_link;
75		75
76	mutex_t lock;	76	mutex_t lock;
77		77
78	/** Number of processors on wich is this address space active. */	78	/** Number of processors on wich is this address space active. */
79	count_t cpu_refcount;	79	count_t cpu_refcount;
80		80
81	/** B+tree of address space areas. */	81	/** B+tree of address space areas. */
82	btree_t as_area_btree;	82	btree_t as_area_btree;
83		83
84	/** Page table pointer. Constant on architectures that use global page hash table. */	84	/** Page table pointer. Constant on architectures that use global page hash table. */
85	pte_t *page_table;	85	pte_t *page_table;
86		86
87	/** Address space identifier. Constant on architectures that do not support ASIDs.*/	87	/** Address space identifier. Constant on architectures that do not support ASIDs.*/
88	asid_t asid;	88	asid_t asid;
89	};	89	};
90		90
91	struct as_operations {	91	struct as_operations {
92	pte_t ( page_table_create)(int flags);	92	pte_t ( page_table_create)(int flags);
93	void (* page_table_lock)(as_t *as, bool lock);	93	void (* page_table_lock)(as_t *as, bool lock);
94	void (* page_table_unlock)(as_t *as, bool unlock);	94	void (* page_table_unlock)(as_t *as, bool unlock);
95	};	95	};
96	typedef struct as_operations as_operations_t;	96	typedef struct as_operations as_operations_t;
97		97
98	/** Address space area attributes. */	98	/** Address space area attributes. */
99	#define AS_AREA_ATTR_NONE 0	99	#define AS_AREA_ATTR_NONE 0
100	#define AS_AREA_ATTR_PARTIAL 1 /*< Not fully initialized area. /	100	#define AS_AREA_ATTR_PARTIAL 1 /*< Not fully initialized area. /
101		101
102	#define AS_PF_FAULT 0 /*< The page fault was not resolved by as_page_fault(). /	102	#define AS_PF_FAULT 0 /*< The page fault was not resolved by as_page_fault(). /
103	#define AS_PF_OK 1 /*< The page fault was resolved by as_page_fault(). /	103	#define AS_PF_OK 1 /*< The page fault was resolved by as_page_fault(). /
104	#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace()	104	#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace()
105	or memcpy_to_uspace(). */	105	or memcpy_to_uspace(). */
106		106
107	/** This structure contains information associated with the shared address space area. */	107	/** This structure contains information associated with the shared address space area. */
108	typedef struct {	108	typedef struct {
109	mutex_t lock; /*< This lock must be acquired only when the as_area lock is held. /	109	mutex_t lock; /*< This lock must be acquired only when the as_area lock is held. /
110	count_t refcount; /*< This structure can be deallocated if refcount drops to 0. /	110	count_t refcount; /*< This structure can be deallocated if refcount drops to 0. /
111	btree_t pagemap; /*< B+tree containing complete map of anonymous pages of the shared area. /	111	btree_t pagemap; /*< B+tree containing complete map of anonymous pages of the shared area. /
112	} share_info_t;	112	} share_info_t;
113		113
114	/** Address space area backend structure. */	114	/** Address space area backend structure. */
115	typedef struct {	115	typedef struct {
116	int (* page_fault)(as_area_t *area, __address addr, pf_access_t access);	116	int (* page_fault)(as_area_t *area, __address addr, pf_access_t access);
117	void (* frame_free)(as_area_t *area, __address page, __address frame);	117	void (* frame_free)(as_area_t *area, __address page, __address frame);
118	void (* share)(as_area_t *area);	118	void (* share)(as_area_t *area);
119	} mem_backend_t;	119	} mem_backend_t;
120		120
121	/** Backend data stored in address space area. */	121	/** Backend data stored in address space area. */
122	typedef union {	122	typedef union {
123	struct { /*< elf_backend members /	123	struct { /*< elf_backend members /
124	elf_header_t *elf;	124	elf_header_t *elf;
125	elf_segment_header_t *segment;	125	elf_segment_header_t *segment;
126	};	126	};
127	struct { /*< phys_backend members /	127	struct { /*< phys_backend members /
128	__address base;	128	__address base;
129	count_t frames;	129	count_t frames;
130	};	130	};
131	} mem_backend_data_t;	131	} mem_backend_data_t;
132		132
133	/** Address space area structure.	133	/** Address space area structure.
134	*	134	*
135	* Each as_area_t structure describes one contiguous area of virtual memory.	135	* Each as_area_t structure describes one contiguous area of virtual memory.
136	* In the future, it should not be difficult to support shared areas.	136	* In the future, it should not be difficult to support shared areas.
137	*/	137	*/
138	struct as_area {	138	struct as_area {
139	mutex_t lock;	139	mutex_t lock;
140	as_t as; /< Containing address space. /	140	as_t as; /< Containing address space. /
141	int flags; /*< Flags related to the memory represented by the address space area. /	141	int flags; /*< Flags related to the memory represented by the address space area. /
142	int attributes; /*< Attributes related to the address space area itself. /	142	int attributes; /*< Attributes related to the address space area itself. /
143	count_t pages; /*< Size of this area in multiples of PAGE_SIZE. /	143	count_t pages; /*< Size of this area in multiples of PAGE_SIZE. /
144	__address base; /*< Base address of this area. /	144	__address base; /*< Base address of this area. /
145	btree_t used_space; /*< Map of used space. /	145	btree_t used_space; /*< Map of used space. /
146	share_info_t sh_info; /*< If the address space area has been shared, this pointer will	146	share_info_t sh_info; /*< If the address space area has been shared, this pointer will
147	reference the share info structure. */	147	reference the share info structure. */
148	mem_backend_t backend; /< Memory backend backing this address space area. /	148	mem_backend_t backend; /< Memory backend backing this address space area. /
149		149
150	/** Data to be used by the backend. */	150	/** Data to be used by the backend. */
151	mem_backend_data_t backend_data;	151	mem_backend_data_t backend_data;
152	};	152	};
153		153
154	extern as_t *AS_KERNEL;	154	extern as_t *AS_KERNEL;
155	extern as_operations_t *as_operations;	155	extern as_operations_t *as_operations;
156		156
157	extern spinlock_t inactive_as_with_asid_lock;	157	extern spinlock_t inactive_as_with_asid_lock;
158	extern link_t inactive_as_with_asid_head;	158	extern link_t inactive_as_with_asid_head;
159		159
160	extern void as_init(void);	160	extern void as_init(void);
161	extern as_t *as_create(int flags);	161	extern as_t *as_create(int flags);
162	extern as_area_t as_area_create(as_t as, int flags, size_t size, __address base, int attrs,	162	extern as_area_t as_area_create(as_t as, int flags, size_t size, __address base, int attrs,
163	mem_backend_t backend, mem_backend_data_t backend_data);	163	mem_backend_t backend, mem_backend_data_t backend_data);
164	extern int as_area_resize(as_t *as, __address address, size_t size, int flags);	164	extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
165	extern int as_area_destroy(as_t *as, __address address);	165	extern int as_area_destroy(as_t *as, __address address);
166	extern int as_area_get_flags(as_area_t *area);	166	extern int as_area_get_flags(as_area_t *area);
167	extern bool as_area_check_access(as_area_t *area, pf_access_t access);	167	extern bool as_area_check_access(as_area_t *area, pf_access_t access);
168	extern int as_page_fault(__address page, pf_access_t access, istate_t *istate);	168	extern int as_page_fault(__address page, pf_access_t access, istate_t *istate);
169	extern void as_switch(as_t old, as_t new);	169	extern void as_switch(as_t old, as_t new);
170	extern void as_free(as_t *as);	170	extern void as_free(as_t *as);
171	extern int as_area_share(as_t *src_as, __address src_base, size_t acc_size,	171	int as_area_share(as_t *src_as, __address src_base, size_t acc_size,
172	__address dst_base, int dst_flags_mask);	172	as_t *dst_as, __address dst_base, int dst_flags_mask);
173	extern size_t as_get_size(__address base);	173	extern size_t as_get_size(__address base);
174	extern int used_space_insert(as_area_t *a, __address page, count_t count);	174	extern int used_space_insert(as_area_t *a, __address page, count_t count);
175	extern int used_space_remove(as_area_t *a, __address page, count_t count);	175	extern int used_space_remove(as_area_t *a, __address page, count_t count);
176		176
177	/* Interface to be implemented by architectures. */	177	/* Interface to be implemented by architectures. */
178	#ifndef as_install_arch	178	#ifndef as_install_arch
179	extern void as_install_arch(as_t *as);	179	extern void as_install_arch(as_t *as);
180	#endif /* !def as_install_arch */	180	#endif /* !def as_install_arch */
181		181
182	/* Backend declarations. */	182	/* Backend declarations. */
183	extern mem_backend_t anon_backend;	183	extern mem_backend_t anon_backend;
184	extern mem_backend_t elf_backend;	184	extern mem_backend_t elf_backend;
185	extern mem_backend_t phys_backend;	185	extern mem_backend_t phys_backend;
186		186
187	/* Address space area related syscalls. */	187	/* Address space area related syscalls. */
188	extern __native sys_as_area_create(__address address, size_t size, int flags);	188	extern __native sys_as_area_create(__address address, size_t size, int flags);
189	extern __native sys_as_area_resize(__address address, size_t size, int flags);	189	extern __native sys_as_area_resize(__address address, size_t size, int flags);
190	extern __native sys_as_area_destroy(__address address);	190	extern __native sys_as_area_destroy(__address address);
191		191
192	#endif /* KERNEL */	192	#endif /* KERNEL */
193		193
194	#endif	194	#endif
195		195