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/*
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/*
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 * Copyright (c) 2001-2004 Jakub Jermar
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 * Copyright (c) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
5
 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * 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.
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 * - Redistributions in binary form must reproduce the above copyright
11
 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   notice, this list of conditions and the following disclaimer in the
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 *   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.
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 *
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,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * 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,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * 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
 */
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28
 
29
/** @addtogroup genericmm
29
/** @addtogroup genericmm
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 * @{
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
/**
56
/** 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
-
 
58
 * other.
-
 
59
 */
57
#define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
60
#define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
58
 
61
 
59
#define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
62
#define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
60
#define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
63
#define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
61
#define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
64
#define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
62
#define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
65
#define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
63
 
66
 
64
#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
67
#define USTACK_ADDRESS          USTACK_ADDRESS_ARCH
65
 
68
 
-
 
69
/** Kernel address space. */
66
#define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
70
#define FLAG_AS_KERNEL          (1 << 0)    
67
 
71
 
68
/** Address space area attributes. */
72
/* Address space area attributes. */
69
#define AS_AREA_ATTR_NONE   0
73
#define AS_AREA_ATTR_NONE   0
70
#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
74
#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
71
 
75
 
72
#define AS_PF_FAULT     0   /**< The page fault was not resolved by as_page_fault(). */
76
/** The page fault was not resolved by as_page_fault(). */
-
 
77
#define AS_PF_FAULT     0
73
#define AS_PF_OK        1   /**< The page fault was resolved by as_page_fault(). */
78
/** The page fault was resolved by as_page_fault(). */
-
 
79
#define AS_PF_OK        1
74
#define AS_PF_DEFER     2   /**< The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
80
/** The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
-
 
81
#define AS_PF_DEFER     2
-
 
82
 
-
 
83
/** Address space structure.
-
 
84
 *
-
 
85
 * as_t contains the list of as_areas of userspace accessible
-
 
86
 * pages for one or more tasks. Ranges of kernel memory pages are not
-
 
87
 * supposed to figure in the list as they are shared by all tasks and
-
 
88
 * set up during system initialization.
-
 
89
 */
-
 
90
typedef struct as {
-
 
91
    /** Protected by asidlock. */
-
 
92
    link_t inactive_as_with_asid_link;
-
 
93
 
-
 
94
    mutex_t lock;
-
 
95
 
-
 
96
    /** Number of references (i.e tasks that reference this as). */
-
 
97
    count_t refcount;
-
 
98
 
-
 
99
    /** Number of processors on wich is this address space active. */
-
 
100
    count_t cpu_refcount;
-
 
101
 
-
 
102
    /** B+tree of address space areas. */
-
 
103
    btree_t as_area_btree;
-
 
104
   
-
 
105
    /**
-
 
106
     *  Address space identifier.
-
 
107
     *  Constant on architectures that do not support ASIDs.
-
 
108
     */
-
 
109
    asid_t asid;
-
 
110
   
-
 
111
    /** Non-generic content. */
-
 
112
    as_genarch_t genarch;
-
 
113
 
-
 
114
    /** Architecture specific content. */
-
 
115
    as_arch_t arch;
-
 
116
} as_t;
75
 
117
 
76
typedef struct {
118
typedef struct {
77
    pte_t *(* page_table_create)(int flags);
119
    pte_t *(* page_table_create)(int flags);
78
    void (* page_table_destroy)(pte_t *page_table);
120
    void (* page_table_destroy)(pte_t *page_table);
79
    void (* page_table_lock)(as_t *as, bool lock);
121
    void (* page_table_lock)(as_t *as, bool lock);
80
    void (* page_table_unlock)(as_t *as, bool unlock);
122
    void (* page_table_unlock)(as_t *as, bool unlock);
81
} as_operations_t;
123
} as_operations_t;
82
 
124
 
-
 
125
/**
83
/** This structure contains information associated with the shared address space area. */
126
 * This structure contains information associated with the shared address space
-
 
127
 * area.
-
 
128
 */
84
typedef struct {
129
typedef struct {
85
    mutex_t lock;       /**< This lock must be acquired only when the as_area lock is held. */
130
    /** This lock must be acquired only when the as_area lock is held. */
-
 
131
    mutex_t lock;      
86
    count_t refcount;   /**< This structure can be deallocated if refcount drops to 0. */
132
    /** This structure can be deallocated if refcount drops to 0. */
-
 
133
    count_t refcount;
-
 
134
    /**
87
    btree_t pagemap;    /**< B+tree containing complete map of anonymous pages of the shared area. */
135
     * B+tree containing complete map of anonymous pages of the shared area.
-
 
136
     */
-
 
137
    btree_t pagemap;
88
} share_info_t;
138
} share_info_t;
89
 
139
 
90
/** Page fault access type. */
140
/** Page fault access type. */
91
typedef enum {
141
typedef enum {
92
    PF_ACCESS_READ,
142
    PF_ACCESS_READ,
93
    PF_ACCESS_WRITE,
143
    PF_ACCESS_WRITE,
94
    PF_ACCESS_EXEC
144
    PF_ACCESS_EXEC
95
} pf_access_t;
145
} pf_access_t;
96
 
146
 
97
struct mem_backend;
147
struct mem_backend;
98
 
148
 
99
/** Backend data stored in address space area. */
149
/** Backend data stored in address space area. */
100
typedef union mem_backend_data {
150
typedef union mem_backend_data {
101
    struct {    /**< elf_backend members */
151
    struct {    /**< elf_backend members */
102
        elf_header_t *elf;
152
        elf_header_t *elf;
103
        elf_segment_header_t *segment;
153
        elf_segment_header_t *segment;
104
    };
154
    };
105
    struct {    /**< phys_backend members */
155
    struct {    /**< phys_backend members */
106
        uintptr_t base;
156
        uintptr_t base;
107
        count_t frames;
157
        count_t frames;
108
    };
158
    };
109
} mem_backend_data_t;
159
} mem_backend_data_t;
110
 
160
 
111
/** Address space area structure.
161
/** Address space area structure.
112
 *
162
 *
113
 * Each as_area_t structure describes one contiguous area of virtual memory.
163
 * Each as_area_t structure describes one contiguous area of virtual memory.
114
 * In the future, it should not be difficult to support shared areas.
164
 * In the future, it should not be difficult to support shared areas.
115
 */
165
 */
116
typedef struct {
166
typedef struct {
117
    mutex_t lock;
167
    mutex_t lock;
118
    as_t *as;       /**< Containing address space. */
168
    /** Containing address space. */
-
 
169
    as_t *as;      
119
    int flags;      /**< Flags related to the memory represented by the address space area. */
170
    /** Flags related to the memory represented by the address space area. */
-
 
171
    int flags;
120
    int attributes;     /**< Attributes related to the address space area itself. */
172
    /** Attributes related to the address space area itself. */
-
 
173
    int attributes;
121
    count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
174
    /** Size of this area in multiples of PAGE_SIZE. */
-
 
175
    count_t pages;
122
    uintptr_t base;     /**< Base address of this area. */
176
    /** Base address of this area. */
-
 
177
    uintptr_t base;
123
    btree_t used_space; /**< Map of used space. */
178
    /** Map of used space. */
-
 
179
    btree_t used_space;
-
 
180
 
-
 
181
    /**
124
    share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
182
     * If the address space area has been shared, this pointer will reference
125
                         reference the share info structure. */
183
     * the share info structure.
-
 
184
     */
-
 
185
    share_info_t *sh_info;
-
 
186
 
126
    struct mem_backend *backend;    /**< Memory backend backing this address space area. */
187
    /** Memory backend backing this address space area. */
-
 
188
    struct mem_backend *backend;
127
 
189
 
128
    /** Data to be used by the backend. */
190
    /** Data to be used by the backend. */
129
    mem_backend_data_t backend_data;
191
    mem_backend_data_t backend_data;
130
} as_area_t;
192
} as_area_t;
131
 
193
 
132
/** Address space area backend structure. */
194
/** Address space area backend structure. */
133
typedef struct mem_backend {
195
typedef struct mem_backend {
134
    int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
196
    int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
135
    void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
197
    void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
136
    void (* share)(as_area_t *area);
198
    void (* share)(as_area_t *area);
137
} mem_backend_t;
199
} mem_backend_t;
138
 
200
 
139
extern as_t *AS_KERNEL;
201
extern as_t *AS_KERNEL;
140
extern as_operations_t *as_operations;
202
extern as_operations_t *as_operations;
141
 
203
 
142
SPINLOCK_EXTERN(inactive_as_with_asid_lock);
204
SPINLOCK_EXTERN(inactive_as_with_asid_lock);
143
extern link_t inactive_as_with_asid_head;
205
extern link_t inactive_as_with_asid_head;
144
 
206
 
145
extern void as_init(void);
207
extern void as_init(void);
146
 
208
 
147
extern as_t *as_create(int flags);
209
extern as_t *as_create(int flags);
148
extern void as_destroy(as_t *as);
210
extern void as_destroy(as_t *as);
149
extern void as_switch(as_t *old, as_t *replace);
211
extern void as_switch(as_t *old_as, as_t *new_as);
150
extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
212
extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
151
 
213
 
152
extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs,
214
extern as_area_t *as_area_create(as_t *as, int flags, size_t size,
-
 
215
    uintptr_t base, int attrs, mem_backend_t *backend,
153
    mem_backend_t *backend, mem_backend_data_t *backend_data);
216
    mem_backend_data_t *backend_data);
154
extern int as_area_destroy(as_t *as, uintptr_t address);   
217
extern int as_area_destroy(as_t *as, uintptr_t address);   
155
extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
218
extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
156
int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
219
int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
157
          as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
220
    as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
158
 
221
 
159
extern int as_area_get_flags(as_area_t *area);
222
extern int as_area_get_flags(as_area_t *area);
160
extern bool as_area_check_access(as_area_t *area, pf_access_t access);
223
extern bool as_area_check_access(as_area_t *area, pf_access_t access);
161
extern size_t as_get_size(uintptr_t base);
224
extern size_t as_get_size(uintptr_t base);
162
extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
225
extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
163
extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
226
extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
164
 
227
 
165
 
228
 
166
/* Interface to be implemented by architectures. */
229
/* Interface to be implemented by architectures. */
167
#ifndef as_constructor_arch
230
#ifndef as_constructor_arch
168
extern int as_constructor_arch(as_t *as, int flags);
231
extern int as_constructor_arch(as_t *as, int flags);
169
#endif /* !def as_constructor_arch */
232
#endif /* !def as_constructor_arch */
170
#ifndef as_destructor_arch
233
#ifndef as_destructor_arch
171
extern int as_destructor_arch(as_t *as);
234
extern int as_destructor_arch(as_t *as);
172
#endif /* !def as_destructor_arch */
235
#endif /* !def as_destructor_arch */
173
#ifndef as_create_arch
236
#ifndef as_create_arch
174
extern int as_create_arch(as_t *as, int flags);
237
extern int as_create_arch(as_t *as, int flags);
175
#endif /* !def as_create_arch */
238
#endif /* !def as_create_arch */
176
#ifndef as_install_arch
239
#ifndef as_install_arch
177
extern void as_install_arch(as_t *as);
240
extern void as_install_arch(as_t *as);
178
#endif /* !def as_install_arch */
241
#endif /* !def as_install_arch */
179
#ifndef as_deinstall_arch
242
#ifndef as_deinstall_arch
180
extern void as_deinstall_arch(as_t *as);
243
extern void as_deinstall_arch(as_t *as);
181
#endif /* !def as_deinstall_arch */
244
#endif /* !def as_deinstall_arch */
182
 
245
 
183
/* Backend declarations and functions. */
246
/* Backend declarations and functions. */
184
extern mem_backend_t anon_backend;
247
extern mem_backend_t anon_backend;
185
extern mem_backend_t elf_backend;
248
extern mem_backend_t elf_backend;
186
extern mem_backend_t phys_backend;
249
extern mem_backend_t phys_backend;
187
 
250
 
188
extern int elf_load(elf_header_t *header, as_t *as);
251
extern int elf_load(elf_header_t *header, as_t *as);
189
 
252
 
190
/* Address space area related syscalls. */
253
/* Address space area related syscalls. */
191
extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
254
extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
192
extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
255
extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
193
extern unative_t sys_as_area_destroy(uintptr_t address);
256
extern unative_t sys_as_area_destroy(uintptr_t address);
194
 
257
 
195
/* Introspection functions. */
258
/* Introspection functions. */
196
extern void as_print(as_t *as);
259
extern void as_print(as_t *as);
197
 
260
 
198
#endif /* KERNEL */
261
#endif /* KERNEL */
199
 
262
 
200
#endif
263
#endif
201
 
264
 
202
/** @}
265
/** @}
203
 */
266
 */
204
 
267