Subversion Repositories HelenOS-historic

Rev

Rev 1468 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
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
15
 *   derived from this software without specific prior written permission.
16
 *
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
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1702 cejka 29
 /** @addtogroup genericmm
30
 * @{
31
 */
32
/** @file
33
 */
34
 
703 jermar 35
#ifndef __AS_H__
36
#define __AS_H__
1 jermar 37
 
1329 palkovsky 38
/** Address space area flags. */
1424 jermar 39
#define AS_AREA_READ        1
40
#define AS_AREA_WRITE       2
41
#define AS_AREA_EXEC        4
42
#define AS_AREA_CACHEABLE   8
1329 palkovsky 43
 
44
#ifdef KERNEL
45
 
121 jermar 46
#include <arch/mm/page.h>
703 jermar 47
#include <arch/mm/as.h>
391 jermar 48
#include <arch/mm/asid.h>
1 jermar 49
#include <arch/types.h>
50
#include <typedefs.h>
51
#include <synch/spinlock.h>
1380 jermar 52
#include <synch/mutex.h>
788 jermar 53
#include <adt/list.h>
1147 jermar 54
#include <adt/btree.h>
1425 jermar 55
#include <elf.h>
1 jermar 56
 
1070 jermar 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
59
 
1 jermar 60
#define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
61
#define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
62
#define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
63
#define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
64
 
65
#define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
66
 
67
#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
68
 
778 palkovsky 69
#define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
727 jermar 70
 
703 jermar 71
/** Address space structure.
72
 *
73
 * as_t contains the list of as_areas of userspace accessible
1 jermar 74
 * pages for one or more tasks. Ranges of kernel memory pages are not
75
 * supposed to figure in the list as they are shared by all tasks and
76
 * set up during system initialization.
77
 */
703 jermar 78
struct as {
1380 jermar 79
    /** Protected by asidlock. */
823 jermar 80
    link_t inactive_as_with_asid_link;
727 jermar 81
 
1380 jermar 82
    mutex_t lock;
823 jermar 83
 
1468 jermar 84
    /** Number of references (i.e tasks that reference this as). */
85
    count_t refcount;
86
 
823 jermar 87
    /** Number of processors on wich is this address space active. */
1415 jermar 88
    count_t cpu_refcount;
823 jermar 89
 
1149 jermar 90
    /** B+tree of address space areas. */
1147 jermar 91
    btree_t as_area_btree;
756 jermar 92
 
93
    /** Page table pointer. Constant on architectures that use global page hash table. */
94
    pte_t *page_table;
95
 
96
    /** Address space identifier. Constant on architectures that do not support ASIDs.*/
97
    asid_t asid;
1 jermar 98
};
99
 
756 jermar 100
struct as_operations {
101
    pte_t *(* page_table_create)(int flags);
1468 jermar 102
    void (* page_table_destroy)(pte_t *page_table);
1044 jermar 103
    void (* page_table_lock)(as_t *as, bool lock);
104
    void (* page_table_unlock)(as_t *as, bool unlock);
756 jermar 105
};
106
typedef struct as_operations as_operations_t;
107
 
1409 jermar 108
/** Address space area attributes. */
109
#define AS_AREA_ATTR_NONE   0
110
#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
111
 
112
#define AS_PF_FAULT     0   /**< The page fault was not resolved by as_page_fault(). */
113
#define AS_PF_OK        1   /**< The page fault was resolved by as_page_fault(). */
114
#define AS_PF_DEFER     2   /**< The page fault was caused by memcpy_from_uspace()
115
                         or memcpy_to_uspace(). */
116
 
1424 jermar 117
/** This structure contains information associated with the shared address space area. */
118
typedef struct {
119
    mutex_t lock;       /**< This lock must be acquired only when the as_area lock is held. */
120
    count_t refcount;   /**< This structure can be deallocated if refcount drops to 0. */
121
    btree_t pagemap;    /**< B+tree containing complete map of anonymous pages of the shared area. */
122
} share_info_t;
1409 jermar 123
 
1424 jermar 124
/** Address space area backend structure. */
125
typedef struct {
126
    int (* page_fault)(as_area_t *area, __address addr, pf_access_t access);
127
    void (* frame_free)(as_area_t *area, __address page, __address frame);
128
    void (* share)(as_area_t *area);
129
} mem_backend_t;
130
 
131
/** Backend data stored in address space area. */
1425 jermar 132
typedef union {
133
    struct {    /**< elf_backend members */
134
        elf_header_t *elf;
135
        elf_segment_header_t *segment;
136
    };
137
    struct {    /**< phys_backend members */
138
        __address base;
139
        count_t frames;
140
    };
1424 jermar 141
} mem_backend_data_t;
142
 
1409 jermar 143
/** Address space area structure.
144
 *
145
 * Each as_area_t structure describes one contiguous area of virtual memory.
146
 * In the future, it should not be difficult to support shared areas.
147
 */
148
struct as_area {
149
    mutex_t lock;
1424 jermar 150
    as_t *as;       /**< Containing address space. */
1409 jermar 151
    int flags;      /**< Flags related to the memory represented by the address space area. */
152
    int attributes;     /**< Attributes related to the address space area itself. */
153
    count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
154
    __address base;     /**< Base address of this area. */
155
    btree_t used_space; /**< Map of used space. */
156
    share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
1424 jermar 157
                         reference the share info structure. */
1409 jermar 158
    mem_backend_t *backend; /**< Memory backend backing this address space area. */
159
 
1424 jermar 160
    /** Data to be used by the backend. */
161
    mem_backend_data_t backend_data;
1409 jermar 162
};
163
 
755 jermar 164
extern as_t *AS_KERNEL;
756 jermar 165
extern as_operations_t *as_operations;
755 jermar 166
 
1415 jermar 167
extern spinlock_t inactive_as_with_asid_lock;
823 jermar 168
extern link_t inactive_as_with_asid_head;
169
 
756 jermar 170
extern void as_init(void);
1468 jermar 171
 
756 jermar 172
extern as_t *as_create(int flags);
1468 jermar 173
extern void as_destroy(as_t *as);
174
extern void as_switch(as_t *old, as_t *new);
175
extern int as_page_fault(__address page, pf_access_t access, istate_t *istate);
176
 
1409 jermar 177
extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs,
1424 jermar 178
    mem_backend_t *backend, mem_backend_data_t *backend_data);
1468 jermar 179
extern int as_area_destroy(as_t *as, __address address);   
1306 jermar 180
extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
1468 jermar 181
int as_area_share(as_t *src_as, __address src_base, size_t acc_size,
182
          as_t *dst_as, __address dst_base, int dst_flags_mask);
183
 
1409 jermar 184
extern int as_area_get_flags(as_area_t *area);
1423 jermar 185
extern bool as_area_check_access(as_area_t *area, pf_access_t access);
1329 palkovsky 186
extern size_t as_get_size(__address base);
1409 jermar 187
extern int used_space_insert(as_area_t *a, __address page, count_t count);
188
extern int used_space_remove(as_area_t *a, __address page, count_t count);
1 jermar 189
 
727 jermar 190
/* Interface to be implemented by architectures. */
703 jermar 191
#ifndef as_install_arch
192
extern void as_install_arch(as_t *as);
193
#endif /* !def as_install_arch */
1 jermar 194
 
1409 jermar 195
/* Backend declarations. */
196
extern mem_backend_t anon_backend;
197
extern mem_backend_t elf_backend;
1424 jermar 198
extern mem_backend_t phys_backend;
1409 jermar 199
 
1235 jermar 200
/* Address space area related syscalls. */
201
extern __native sys_as_area_create(__address address, size_t size, int flags);
202
extern __native sys_as_area_resize(__address address, size_t size, int flags);
1306 jermar 203
extern __native sys_as_area_destroy(__address address);
1235 jermar 204
 
1329 palkovsky 205
#endif /* KERNEL */
206
 
1 jermar 207
#endif
1702 cejka 208
 
209
 /** @}
210
 */
211