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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
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 * 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
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 * - Redistributions of source code must retain the above copyright
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 *   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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 *
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 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * 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,
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 * 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
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 * 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.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** @addtogroup genericmm
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/** @addtogroup genericmm
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 * @{
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 * @{
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 */
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 <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
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#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
    /** Architecture specific content. */
97
    /** Architecture specific content. */
98
    as_arch_t arch;
98
    as_arch_t arch;
99
};
99
};
100
 
100
 
101
struct as_operations {
101
struct as_operations {
102
    pte_t *(* page_table_create)(int flags);
102
    pte_t *(* page_table_create)(int flags);
103
    void (* page_table_destroy)(pte_t *page_table);
103
    void (* page_table_destroy)(pte_t *page_table);
104
    void (* page_table_lock)(as_t *as, bool lock);
104
    void (* page_table_lock)(as_t *as, bool lock);
105
    void (* page_table_unlock)(as_t *as, bool unlock);
105
    void (* page_table_unlock)(as_t *as, bool unlock);
106
};
106
};
107
typedef struct as_operations as_operations_t;
107
typedef struct as_operations as_operations_t;
108
 
108
 
109
/** Address space area attributes. */
109
/** Address space area attributes. */
110
#define AS_AREA_ATTR_NONE   0
110
#define AS_AREA_ATTR_NONE   0
111
#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
111
#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
112
 
112
 
113
#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(). */
114
#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(). */
115
#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()
116
                         or memcpy_to_uspace(). */
116
                         or memcpy_to_uspace(). */
117
 
117
 
118
/** This structure contains information associated with the shared address space area. */
118
/** This structure contains information associated with the shared address space area. */
119
typedef struct {
119
typedef struct {
120
    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. */
121
    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. */
122
    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. */
123
} share_info_t;
123
} share_info_t;
124
 
124
 
125
/** Address space area backend structure. */
125
/** Address space area backend structure. */
126
typedef struct {
126
typedef struct {
127
    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);
128
    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);
129
    void (* share)(as_area_t *area);
129
    void (* share)(as_area_t *area);
130
} mem_backend_t;
130
} mem_backend_t;
131
 
131
 
132
/** Backend data stored in address space area. */
132
/** Backend data stored in address space area. */
133
typedef union {
133
typedef union {
134
    struct {    /**< elf_backend members */
134
    struct {    /**< elf_backend members */
135
        elf_header_t *elf;
135
        elf_header_t *elf;
136
        elf_segment_header_t *segment;
136
        elf_segment_header_t *segment;
137
    };
137
    };
138
    struct {    /**< phys_backend members */
138
    struct {    /**< phys_backend members */
139
        uintptr_t base;
139
        uintptr_t base;
140
        count_t frames;
140
        count_t frames;
141
    };
141
    };
142
} mem_backend_data_t;
142
} mem_backend_data_t;
143
 
143
 
144
/** Address space area structure.
144
/** Address space area structure.
145
 *
145
 *
146
 * 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.
147
 * 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.
148
 */
148
 */
149
struct as_area {
149
struct as_area {
150
    mutex_t lock;
150
    mutex_t lock;
151
    as_t *as;       /**< Containing address space. */
151
    as_t *as;       /**< Containing address space. */
152
    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. */
153
    int attributes;     /**< Attributes related to the address space area itself. */
153
    int attributes;     /**< Attributes related to the address space area itself. */
154
    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. */
155
    uintptr_t base;     /**< Base address of this area. */
155
    uintptr_t base;     /**< Base address of this area. */
156
    btree_t used_space; /**< Map of used space. */
156
    btree_t used_space; /**< Map of used space. */
157
    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
158
                         reference the share info structure. */
158
                         reference the share info structure. */
159
    mem_backend_t *backend; /**< Memory backend backing this address space area. */
159
    mem_backend_t *backend; /**< Memory backend backing this address space area. */
160
 
160
 
161
    /** Data to be used by the backend. */
161
    /** Data to be used by the backend. */
162
    mem_backend_data_t backend_data;
162
    mem_backend_data_t backend_data;
163
};
163
};
164
 
164
 
165
extern as_t *AS_KERNEL;
165
extern as_t *AS_KERNEL;
166
extern as_operations_t *as_operations;
166
extern as_operations_t *as_operations;
167
 
167
 
168
extern spinlock_t inactive_as_with_asid_lock;
168
extern spinlock_t inactive_as_with_asid_lock;
169
extern link_t inactive_as_with_asid_head;
169
extern link_t inactive_as_with_asid_head;
170
 
170
 
171
extern void as_init(void);
171
extern void as_init(void);
172
 
172
 
173
extern as_t *as_create(int flags);
173
extern as_t *as_create(int flags);
174
extern void as_destroy(as_t *as);
174
extern void as_destroy(as_t *as);
175
extern void as_switch(as_t *old, as_t *new);
175
extern void as_switch(as_t *old, as_t *new);
176
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);
177
 
177
 
178
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,
179
    mem_backend_t *backend, mem_backend_data_t *backend_data);
179
    mem_backend_t *backend, mem_backend_data_t *backend_data);
180
extern int as_area_destroy(as_t *as, uintptr_t address);   
180
extern int as_area_destroy(as_t *as, uintptr_t address);   
181
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);
182
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,
183
          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);
184
 
184
 
185
extern int as_area_get_flags(as_area_t *area);
185
extern int as_area_get_flags(as_area_t *area);
186
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);
187
extern size_t as_get_size(uintptr_t base);
187
extern size_t as_get_size(uintptr_t base);
188
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);
189
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);
190
 
190
 
191
 
191
 
192
/* Interface to be implemented by architectures. */
192
/* Interface to be implemented by architectures. */
193
#ifndef as_constructor_arch
193
#ifndef as_constructor_arch
194
extern int as_constructor_arch(as_t *as, int flags);
194
extern int as_constructor_arch(as_t *as, int flags);
195
#endif /* !def as_constructor_arch */
195
#endif /* !def as_constructor_arch */
196
#ifndef as_destructor_arch
196
#ifndef as_destructor_arch
197
extern int as_destructor_arch(as_t *as);
197
extern int as_destructor_arch(as_t *as);
198
#endif /* !def as_destructor_arch */
198
#endif /* !def as_destructor_arch */
199
#ifndef as_create_arch
199
#ifndef as_create_arch
200
extern int as_create_arch(as_t *as, int flags);
200
extern int as_create_arch(as_t *as, int flags);
201
#endif /* !def as_create_arch */
201
#endif /* !def as_create_arch */
202
#ifndef as_install_arch
202
#ifndef as_install_arch
203
extern void as_install_arch(as_t *as);
203
extern void as_install_arch(as_t *as);
204
#endif /* !def as_install_arch */
204
#endif /* !def as_install_arch */
205
#ifndef as_deinstall_arch
205
#ifndef as_deinstall_arch
206
extern void as_deinstall_arch(as_t *as);
206
extern void as_deinstall_arch(as_t *as);
207
#endif /* !def as_deinstall_arch */
207
#endif /* !def as_deinstall_arch */
208
 
208
 
209
/* Backend declarations. */
209
/* Backend declarations. */
210
extern mem_backend_t anon_backend;
210
extern mem_backend_t anon_backend;
211
extern mem_backend_t elf_backend;
211
extern mem_backend_t elf_backend;
212
extern mem_backend_t phys_backend;
212
extern mem_backend_t phys_backend;
213
 
213
 
214
/* Address space area related syscalls. */
214
/* Address space area related syscalls. */
215
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);
216
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);
217
extern unative_t sys_as_area_destroy(uintptr_t address);
217
extern unative_t sys_as_area_destroy(uintptr_t address);
218
 
218
 
219
/* Introspection functions. */
219
/* Introspection functions. */
220
extern void as_print(as_t *as);
220
extern void as_print(as_t *as);
221
 
221
 
222
#endif /* KERNEL */
222
#endif /* KERNEL */
223
 
223
 
224
#endif
224
#endif
225
 
225
 
226
/** @}
226
/** @}
227
 */
227
 */
228
 
228