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 <synch/spinlock.h>
#include <synch/mutex.h>
#include <adt/list.h>
#include <adt/btree.h>
#include <lib/elf.h>
 
#ifdef __OBJC__
#include <lib/objc.h>
#endif
 
/**
 * 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
 
/** Kernel address space. */
#define FLAG_AS_KERNEL          (1 << 0)    
 
/* Address space area attributes. */
#define AS_AREA_ATTR_NONE   0
#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
 
/** The page fault was not resolved by as_page_fault(). */
#define AS_PF_FAULT     0
/** The page fault was resolved by as_page_fault(). */
#define AS_PF_OK        1
/** The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
#define AS_PF_DEFER     2
 
#ifdef __OBJC__
@interface as_t : base_t {
    @public
        /** 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;
       
        /**
         *  Address space identifier.
         *  Constant on architectures that do not support ASIDs.
         */
        asid_t asid;
       
        /** Non-generic content. */
        as_genarch_t genarch;
       
        /** Architecture specific content. */
        as_arch_t arch;
}
 
+ (pte_t *) page_table_create: (int) flags;
+ (void) page_table_destroy: (pte_t *) page_table;
- (void) page_table_lock: (bool) _lock;
- (void) page_table_unlock: (bool) unlock;
 
@end
 
#else
 
/** 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.
 */
typedef 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;
   
    /**
     *  Address space identifier.
     *  Constant on architectures that do not support ASIDs.
     */
    asid_t asid;
   
    /** Non-generic content. */
    as_genarch_t genarch;
 
    /** Architecture specific content. */
    as_arch_t arch;
} as_t;
 
typedef struct {
    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);
} as_operations_t;
#endif
 
/**
 * This structure contains information associated with the shared address space
 * area.
 */
typedef struct {
    /** This lock must be acquired only when the as_area lock is held. */
    mutex_t lock;      
    /** This structure can be deallocated if refcount drops to 0. */
    count_t refcount;
    /**
     * B+tree containing complete map of anonymous pages of the shared area.
     */
    btree_t pagemap;
} share_info_t;
 
/** Page fault access type. */
typedef enum {
    PF_ACCESS_READ,
    PF_ACCESS_WRITE,
    PF_ACCESS_EXEC
} pf_access_t;
 
struct mem_backend;
 
/** Backend data stored in address space area. */
typedef union mem_backend_data {
    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.
 
 */
typedef struct {
    mutex_t lock;
    /** Containing address space. */
    as_t *as;      
    /**
     * Flags related to the memory represented by the address space area.
     */
    int flags;
    /** Attributes related to the address space area itself. */
    int attributes;
    /** Size of this area in multiples of PAGE_SIZE. */
    count_t pages;
    /** Base address of this area. */
    uintptr_t base;
    /** Map of used space. */
    btree_t used_space;
 
    /**
     * If the address space area has been shared, this pointer will
     * reference the share info structure.
     */
    share_info_t *sh_info;
 
    /** Memory backend backing this address space area. */
    struct mem_backend *backend;
 
    /** Data to be used by the backend. */
    mem_backend_data_t backend_data;
} as_area_t;
 
/** Address space area backend structure. */
typedef struct mem_backend {
    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;
 
extern as_t *AS_KERNEL;
 
#ifndef __OBJC__
extern as_operations_t *as_operations;
#endif
 
SPINLOCK_EXTERN(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, as_t *new_as);
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 and functions. */
extern mem_backend_t anon_backend;
extern mem_backend_t elf_backend;
extern mem_backend_t phys_backend;
 
extern int elf_load(elf_header_t *header, as_t *as);
 
/* 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
 
/** @}
 */
 

Rev 2126	Rev 2142
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 <synch/spinlock.h>	50	#include <synch/spinlock.h>
51	#include <synch/mutex.h>	51	#include <synch/mutex.h>
52	#include <adt/list.h>	52	#include <adt/list.h>
53	#include <adt/btree.h>	53	#include <adt/btree.h>
54	#include <lib/elf.h>	54	#include <lib/elf.h>
55		55
56	#ifdef __OBJC__	56	#ifdef __OBJC__
57	#include <lib/objc.h>	57	#include <lib/objc.h>
58	#endif	58	#endif
59		59
60	/**	60	/**
61	* Defined to be true if user address space and kernel address space shadow each	61	* Defined to be true if user address space and kernel address space shadow each
62	* other.	62	* other.
63	*/	63	*/
64	#define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH	64	#define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
65		65
66	#define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH	66	#define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH
67	#define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH	67	#define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH
68	#define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH	68	#define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH
69	#define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH	69	#define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH
70		70
71	#define USTACK_ADDRESS USTACK_ADDRESS_ARCH	71	#define USTACK_ADDRESS USTACK_ADDRESS_ARCH
72		72
73	/** Kernel address space. */	73	/** Kernel address space. */
74	#define FLAG_AS_KERNEL (1 << 0)	74	#define FLAG_AS_KERNEL (1 << 0)
75		75
76	/* Address space area attributes. */	76	/* Address space area attributes. */
77	#define AS_AREA_ATTR_NONE 0	77	#define AS_AREA_ATTR_NONE 0
78	#define AS_AREA_ATTR_PARTIAL 1 /*< Not fully initialized area. /	78	#define AS_AREA_ATTR_PARTIAL 1 /*< Not fully initialized area. /
79		79
80	/** The page fault was not resolved by as_page_fault(). */	80	/** The page fault was not resolved by as_page_fault(). */
81	#define AS_PF_FAULT 0	81	#define AS_PF_FAULT 0
82	/** The page fault was resolved by as_page_fault(). */	82	/** The page fault was resolved by as_page_fault(). */
83	#define AS_PF_OK 1	83	#define AS_PF_OK 1
84	/** The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */	84	/** The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
85	#define AS_PF_DEFER 2	85	#define AS_PF_DEFER 2
86		86
87	#ifdef __OBJC__	87	#ifdef __OBJC__
88	@interface as_t : base_t {	88	@interface as_t : base_t {
89	@public	89	@public
90	/** Protected by asidlock. */	90	/** Protected by asidlock. */
91	link_t inactive_as_with_asid_link;	91	link_t inactive_as_with_asid_link;
92		92
93	mutex_t lock;	93	mutex_t lock;
94		94
95	/** Number of references (i.e tasks that reference this as). */	95	/** Number of references (i.e tasks that reference this as). */
96	count_t refcount;	96	count_t refcount;
97		97
98	/** Number of processors on wich is this address space active. */	98	/** Number of processors on wich is this address space active. */
99	count_t cpu_refcount;	99	count_t cpu_refcount;
100		100
101	/** B+tree of address space areas. */	101	/** B+tree of address space areas. */
102	btree_t as_area_btree;	102	btree_t as_area_btree;
103		103
104	/**	104	/**
105	* Address space identifier.	105	* Address space identifier.
106	* Constant on architectures that do not support ASIDs.	106	* Constant on architectures that do not support ASIDs.
107	*/	107	*/
108	asid_t asid;	108	asid_t asid;
109		109
110	/** Non-generic content. */	110	/** Non-generic content. */
111	as_genarch_t genarch;	111	as_genarch_t genarch;
112		112
113	/** Architecture specific content. */	113	/** Architecture specific content. */
114	as_arch_t arch;	114	as_arch_t arch;
115	}	115	}
116		116
117	+ (pte_t *) page_table_create: (int) flags;	117	+ (pte_t *) page_table_create: (int) flags;
118	+ (void) page_table_destroy: (pte_t *) page_table;	118	+ (void) page_table_destroy: (pte_t *) page_table;
119	- (void) page_table_lock: (bool) _lock;	119	- (void) page_table_lock: (bool) _lock;
120	- (void) page_table_unlock: (bool) unlock;	120	- (void) page_table_unlock: (bool) unlock;
121		121
122	@end	122	@end
123		123
124	#else	124	#else
125		125
126	/** Address space structure.	126	/** Address space structure.
127	*	127	*
128	* as_t contains the list of as_areas of userspace accessible	128	* as_t contains the list of as_areas of userspace accessible
129	* pages for one or more tasks. Ranges of kernel memory pages are not	129	* pages for one or more tasks. Ranges of kernel memory pages are not
130	* supposed to figure in the list as they are shared by all tasks and	130	* supposed to figure in the list as they are shared by all tasks and
131	* set up during system initialization.	131	* set up during system initialization.
132	*/	132	*/
133	typedef struct as {	133	typedef struct as {
134	/** Protected by asidlock. */	134	/** Protected by asidlock. */
135	link_t inactive_as_with_asid_link;	135	link_t inactive_as_with_asid_link;
136		136
137	mutex_t lock;	137	mutex_t lock;
138		138
139	/** Number of references (i.e tasks that reference this as). */	139	/** Number of references (i.e tasks that reference this as). */
140	count_t refcount;	140	count_t refcount;
141		141
142	/** Number of processors on wich is this address space active. */	142	/** Number of processors on wich is this address space active. */
143	count_t cpu_refcount;	143	count_t cpu_refcount;
144		144
145	/** B+tree of address space areas. */	145	/** B+tree of address space areas. */
146	btree_t as_area_btree;	146	btree_t as_area_btree;
147		147
148	/**	148	/**
149	* Address space identifier.	149	* Address space identifier.
150	* Constant on architectures that do not support ASIDs.	150	* Constant on architectures that do not support ASIDs.
151	*/	151	*/
152	asid_t asid;	152	asid_t asid;
153		153
154	/** Non-generic content. */	154	/** Non-generic content. */
155	as_genarch_t genarch;	155	as_genarch_t genarch;
156		156
157	/** Architecture specific content. */	157	/** Architecture specific content. */
158	as_arch_t arch;	158	as_arch_t arch;
159	} as_t;	159	} as_t;
160		160
161	typedef struct {	161	typedef struct {
162	pte_t ( page_table_create)(int flags);	162	pte_t ( page_table_create)(int flags);
163	void (* page_table_destroy)(pte_t *page_table);	163	void (* page_table_destroy)(pte_t *page_table);
164	void (* page_table_lock)(as_t *as, bool lock);	164	void (* page_table_lock)(as_t *as, bool lock);
165	void (* page_table_unlock)(as_t *as, bool unlock);	165	void (* page_table_unlock)(as_t *as, bool unlock);
166	} as_operations_t;	166	} as_operations_t;
167	#endif	167	#endif
168		168
169	/**	169	/**
170	* This structure contains information associated with the shared address space	170	* This structure contains information associated with the shared address space
171	* area.	171	* area.
172	*/	172	*/
173	typedef struct {	173	typedef struct {
174	/** This lock must be acquired only when the as_area lock is held. */	174	/** This lock must be acquired only when the as_area lock is held. */
175	mutex_t lock;	175	mutex_t lock;
176	/** This structure can be deallocated if refcount drops to 0. */	176	/** This structure can be deallocated if refcount drops to 0. */
177	count_t refcount;	177	count_t refcount;
178	/**	178	/**
179	* B+tree containing complete map of anonymous pages of the shared area.	179	* B+tree containing complete map of anonymous pages of the shared area.
180	*/	180	*/
181	btree_t pagemap;	181	btree_t pagemap;
182	} share_info_t;	182	} share_info_t;
183		183
184	/** Page fault access type. */	184	/** Page fault access type. */
185	typedef enum {	185	typedef enum {
186	PF_ACCESS_READ,	186	PF_ACCESS_READ,
187	PF_ACCESS_WRITE,	187	PF_ACCESS_WRITE,
188	PF_ACCESS_EXEC	188	PF_ACCESS_EXEC
189	} pf_access_t;	189	} pf_access_t;
190		190
191	struct mem_backend;	191	struct mem_backend;
192		192
193	/** Backend data stored in address space area. */	193	/** Backend data stored in address space area. */
194	typedef union mem_backend_data {	194	typedef union mem_backend_data {
195	struct { /*< elf_backend members /	195	struct { /*< elf_backend members /
196	elf_header_t *elf;	196	elf_header_t *elf;
197	elf_segment_header_t *segment;	197	elf_segment_header_t *segment;
198	};	198	};
199	struct { /*< phys_backend members /	199	struct { /*< phys_backend members /
200	uintptr_t base;	200	uintptr_t base;
201	count_t frames;	201	count_t frames;
202	};	202	};
203	} mem_backend_data_t;	203	} mem_backend_data_t;
204		204
205	/** Address space area structure.	205	/** Address space area structure.
206	*	206	*
207	* Each as_area_t structure describes one contiguous area of virtual memory.	207	* Each as_area_t structure describes one contiguous area of virtual memory.
208	* In the future, it should not be difficult to support shared areas.	-
209	*/	208	*/
210	typedef struct {	209	typedef struct {
211	mutex_t lock;	210	mutex_t lock;
212	/** Containing address space. */	211	/** Containing address space. */
213	as_t *as;	212	as_t *as;
214	/**	213	/**
215	* Flags related to the memory represented by the address space area.	214	* Flags related to the memory represented by the address space area.
216	*/	215	*/
217	int flags;	216	int flags;
218	/** Attributes related to the address space area itself. */	217	/** Attributes related to the address space area itself. */
219	int attributes;	218	int attributes;
220	/** Size of this area in multiples of PAGE_SIZE. */	219	/** Size of this area in multiples of PAGE_SIZE. */
221	count_t pages;	220	count_t pages;
222	/** Base address of this area. */	221	/** Base address of this area. */
223	uintptr_t base;	222	uintptr_t base;
224	/** Map of used space. */	223	/** Map of used space. */
225	btree_t used_space;	224	btree_t used_space;
226		225
227	/**	226	/**
228	* If the address space area has been shared, this pointer will	227	* If the address space area has been shared, this pointer will
229	* reference the share info structure.	228	* reference the share info structure.
230	*/	229	*/
231	share_info_t *sh_info;	230	share_info_t *sh_info;
232		231
233	/** Memory backend backing this address space area. */	232	/** Memory backend backing this address space area. */
234	struct mem_backend *backend;	233	struct mem_backend *backend;
235		234
236	/** Data to be used by the backend. */	235	/** Data to be used by the backend. */
237	mem_backend_data_t backend_data;	236	mem_backend_data_t backend_data;
238	} as_area_t;	237	} as_area_t;
239		238
240	/** Address space area backend structure. */	239	/** Address space area backend structure. */
241	typedef struct mem_backend {	240	typedef struct mem_backend {
242	int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);	241	int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
243	void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);	242	void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
244	void (* share)(as_area_t *area);	243	void (* share)(as_area_t *area);
245	} mem_backend_t;	244	} mem_backend_t;
246		245
247	extern as_t *AS_KERNEL;	246	extern as_t *AS_KERNEL;
248		247
249	#ifndef __OBJC__	248	#ifndef __OBJC__
250	extern as_operations_t *as_operations;	249	extern as_operations_t *as_operations;
251	#endif	250	#endif
252		251
253	SPINLOCK_EXTERN(inactive_as_with_asid_lock);	252	SPINLOCK_EXTERN(inactive_as_with_asid_lock);
254	extern link_t inactive_as_with_asid_head;	253	extern link_t inactive_as_with_asid_head;
255		254
256	extern void as_init(void);	255	extern void as_init(void);
257		256
258	extern as_t *as_create(int flags);	257	extern as_t *as_create(int flags);
259	extern void as_destroy(as_t *as);	258	extern void as_destroy(as_t *as);
260	extern void as_switch(as_t old_as, as_t new_as);	259	extern void as_switch(as_t old_as, as_t new_as);
261	extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);	260	extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
262		261
263	extern as_area_t as_area_create(as_t as, int flags, size_t size,	262	extern as_area_t as_area_create(as_t as, int flags, size_t size,
264	uintptr_t base, int attrs, mem_backend_t *backend,	263	uintptr_t base, int attrs, mem_backend_t *backend,
265	mem_backend_data_t *backend_data);	264	mem_backend_data_t *backend_data);
266	extern int as_area_destroy(as_t *as, uintptr_t address);	265	extern int as_area_destroy(as_t *as, uintptr_t address);
267	extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);	266	extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
268	int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,	267	int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
269	as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);	268	as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
270		269
271	extern int as_area_get_flags(as_area_t *area);	270	extern int as_area_get_flags(as_area_t *area);
272	extern bool as_area_check_access(as_area_t *area, pf_access_t access);	271	extern bool as_area_check_access(as_area_t *area, pf_access_t access);
273	extern size_t as_get_size(uintptr_t base);	272	extern size_t as_get_size(uintptr_t base);
274	extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);	273	extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
275	extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);	274	extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
276		275
277		276
278	/* Interface to be implemented by architectures. */	277	/* Interface to be implemented by architectures. */
279	#ifndef as_constructor_arch	278	#ifndef as_constructor_arch
280	extern int as_constructor_arch(as_t *as, int flags);	279	extern int as_constructor_arch(as_t *as, int flags);
281	#endif /* !def as_constructor_arch */	280	#endif /* !def as_constructor_arch */
282	#ifndef as_destructor_arch	281	#ifndef as_destructor_arch
283	extern int as_destructor_arch(as_t *as);	282	extern int as_destructor_arch(as_t *as);
284	#endif /* !def as_destructor_arch */	283	#endif /* !def as_destructor_arch */
285	#ifndef as_create_arch	284	#ifndef as_create_arch
286	extern int as_create_arch(as_t *as, int flags);	285	extern int as_create_arch(as_t *as, int flags);
287	#endif /* !def as_create_arch */	286	#endif /* !def as_create_arch */
288	#ifndef as_install_arch	287	#ifndef as_install_arch
289	extern void as_install_arch(as_t *as);	288	extern void as_install_arch(as_t *as);
290	#endif /* !def as_install_arch */	289	#endif /* !def as_install_arch */
291	#ifndef as_deinstall_arch	290	#ifndef as_deinstall_arch
292	extern void as_deinstall_arch(as_t *as);	291	extern void as_deinstall_arch(as_t *as);
293	#endif /* !def as_deinstall_arch */	292	#endif /* !def as_deinstall_arch */
294		293
295	/* Backend declarations and functions. */	294	/* Backend declarations and functions. */
296	extern mem_backend_t anon_backend;	295	extern mem_backend_t anon_backend;
297	extern mem_backend_t elf_backend;	296	extern mem_backend_t elf_backend;
298	extern mem_backend_t phys_backend;	297	extern mem_backend_t phys_backend;
299		298
300	extern int elf_load(elf_header_t header, as_t as);	299	extern int elf_load(elf_header_t header, as_t as);
301		300
302	/* Address space area related syscalls. */	301	/* Address space area related syscalls. */
303	extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);	302	extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
304	extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);	303	extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
305	extern unative_t sys_as_area_destroy(uintptr_t address);	304	extern unative_t sys_as_area_destroy(uintptr_t address);
306		305
307	/* Introspection functions. */	306	/* Introspection functions. */
308	extern void as_print(as_t *as);	307	extern void as_print(as_t *as);
309		308
310	#endif /* KERNEL */	309	#endif /* KERNEL */
311		310
312	#endif	311	#endif
313		312
314	/** @}	313	/** @}
315	*/	314	*/
316		315

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/include/mm/as.h – Rev 2126 → 2142