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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
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 *
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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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 * are met:
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 *
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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.
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 * - 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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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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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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 * 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,
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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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 * 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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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1851 jermar 29
/** @addtogroup genericmm
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 * @{
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 */
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/** @file
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 */
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1888 jermar 35
#ifndef KERN_AS_H_
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#define KERN_AS_H_
1 jermar 37
 
1329 palkovsky 38
/** Address space area flags. */
1424 jermar 39
#define AS_AREA_READ        1
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#define AS_AREA_WRITE       2
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#define AS_AREA_EXEC        4
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#define AS_AREA_CACHEABLE   8
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#ifdef KERNEL
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121 jermar 46
#include <arch/mm/page.h>
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#include <arch/mm/as.h>
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#include <arch/mm/asid.h>
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#include <arch/types.h>
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#include <synch/spinlock.h>
1380 jermar 51
#include <synch/mutex.h>
788 jermar 52
#include <adt/list.h>
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#include <adt/btree.h>
2000 decky 54
#include <lib/elf.h>
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2106 jermar 56
/**
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 * Defined to be true if user address space and kernel address space shadow each
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 * other.
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 */
1070 jermar 60
#define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
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1 jermar 62
#define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
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#define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
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#define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
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#define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
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2106 jermar 67
#define USTACK_ADDRESS          USTACK_ADDRESS_ARCH
1 jermar 68
 
2106 jermar 69
/** Kernel address space. */
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#define FLAG_AS_KERNEL          (1 << 0)    
727 jermar 71
 
2106 jermar 72
/* Address space area attributes. */
2089 decky 73
#define AS_AREA_ATTR_NONE   0
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#define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
727 jermar 75
 
2106 jermar 76
/** The page fault was not resolved by as_page_fault(). */
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#define AS_PF_FAULT     0
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/** The page fault was resolved by as_page_fault(). */
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#define AS_PF_OK        1
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/** The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
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#define AS_PF_DEFER     2
823 jermar 82
 
2106 jermar 83
/** Address space structure.
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 *
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 * as_t contains the list of as_areas of userspace accessible
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 * pages for one or more tasks. Ranges of kernel memory pages are not
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 * supposed to figure in the list as they are shared by all tasks and
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 * set up during system initialization.
89
 */
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typedef struct as {
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    /** Protected by asidlock. */
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    link_t inactive_as_with_asid_link;
2170 jermar 93
    /**
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     * Number of processors on wich is this address space active.
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     * Protected by asidlock.
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     */
4490 decky 97
    size_t cpu_refcount;
2170 jermar 98
    /**
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     * Address space identifier.
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     * Constant on architectures that do not support ASIDs.
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     * Protected by asidlock.
102
     */
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    asid_t asid;
2106 jermar 104
 
2183 jermar 105
    /** Number of references (i.e tasks that reference this as). */
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    atomic_t refcount;
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2106 jermar 108
    mutex_t lock;
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110
    /** B+tree of address space areas. */
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    btree_t as_area_btree;
112
 
113
    /** Non-generic content. */
114
    as_genarch_t genarch;
115
 
116
    /** Architecture specific content. */
117
    as_arch_t arch;
118
} as_t;
119
 
2089 decky 120
typedef struct {
756 jermar 121
    pte_t *(* page_table_create)(int flags);
1468 jermar 122
    void (* page_table_destroy)(pte_t *page_table);
1044 jermar 123
    void (* page_table_lock)(as_t *as, bool lock);
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    void (* page_table_unlock)(as_t *as, bool unlock);
2089 decky 125
} as_operations_t;
756 jermar 126
 
2106 jermar 127
/**
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 * This structure contains information associated with the shared address space
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 * area.
130
 */
1424 jermar 131
typedef struct {
2106 jermar 132
    /** This lock must be acquired only when the as_area lock is held. */
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    mutex_t lock;      
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    /** This structure can be deallocated if refcount drops to 0. */
4490 decky 135
    size_t refcount;
2106 jermar 136
    /**
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     * B+tree containing complete map of anonymous pages of the shared area.
138
     */
139
    btree_t pagemap;
1424 jermar 140
} share_info_t;
1409 jermar 141
 
2089 decky 142
/** Page fault access type. */
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typedef enum {
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    PF_ACCESS_READ,
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    PF_ACCESS_WRITE,
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    PF_ACCESS_EXEC
147
} pf_access_t;
1424 jermar 148
 
2089 decky 149
struct mem_backend;
150
 
1424 jermar 151
/** Backend data stored in address space area. */
2089 decky 152
typedef union mem_backend_data {
1425 jermar 153
    struct {    /**< elf_backend members */
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        elf_header_t *elf;
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        elf_segment_header_t *segment;
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    };
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    struct {    /**< phys_backend members */
1780 jermar 158
        uintptr_t base;
4490 decky 159
        size_t frames;
1425 jermar 160
    };
1424 jermar 161
} mem_backend_data_t;
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1409 jermar 163
/** Address space area structure.
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 *
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 * Each as_area_t structure describes one contiguous area of virtual memory.
166
 */
2089 decky 167
typedef struct {
1409 jermar 168
    mutex_t lock;
2106 jermar 169
    /** Containing address space. */
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    as_t *as;      
2107 jermar 171
    /**
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     * Flags related to the memory represented by the address space area.
173
     */
2106 jermar 174
    int flags;
175
    /** Attributes related to the address space area itself. */
176
    int attributes;
177
    /** Size of this area in multiples of PAGE_SIZE. */
4490 decky 178
    size_t pages;
2106 jermar 179
    /** Base address of this area. */
180
    uintptr_t base;
181
    /** Map of used space. */
182
    btree_t used_space;
1409 jermar 183
 
2106 jermar 184
    /**
2107 jermar 185
     * If the address space area has been shared, this pointer will
186
     * reference the share info structure.
2106 jermar 187
     */
188
    share_info_t *sh_info;
189
 
190
    /** Memory backend backing this address space area. */
191
    struct mem_backend *backend;
192
 
1424 jermar 193
    /** Data to be used by the backend. */
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    mem_backend_data_t backend_data;
2089 decky 195
} as_area_t;
1409 jermar 196
 
2089 decky 197
/** Address space area backend structure. */
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typedef struct mem_backend {
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    int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
200
    void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
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    void (* share)(as_area_t *area);
202
} mem_backend_t;
203
 
755 jermar 204
extern as_t *AS_KERNEL;
2125 decky 205
 
756 jermar 206
extern as_operations_t *as_operations;
823 jermar 207
extern link_t inactive_as_with_asid_head;
208
 
756 jermar 209
extern void as_init(void);
1468 jermar 210
 
756 jermar 211
extern as_t *as_create(int flags);
1468 jermar 212
extern void as_destroy(as_t *as);
2106 jermar 213
extern void as_switch(as_t *old_as, as_t *new_as);
1780 jermar 214
extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
1468 jermar 215
 
2106 jermar 216
extern as_area_t *as_area_create(as_t *as, int flags, size_t size,
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    uintptr_t base, int attrs, mem_backend_t *backend,
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    mem_backend_data_t *backend_data);
1780 jermar 219
extern int as_area_destroy(as_t *as, uintptr_t address);   
220
extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
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int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
2106 jermar 222
    as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
3222 svoboda 223
extern int as_area_change_flags(as_t *as, int flags, uintptr_t address);
1468 jermar 224
 
1409 jermar 225
extern int as_area_get_flags(as_area_t *area);
1423 jermar 226
extern bool as_area_check_access(as_area_t *area, pf_access_t access);
2556 jermar 227
extern size_t as_area_get_size(uintptr_t base);
4490 decky 228
extern int used_space_insert(as_area_t *a, uintptr_t page, size_t count);
229
extern int used_space_remove(as_area_t *a, uintptr_t page, size_t count);
1 jermar 230
 
1891 jermar 231
 
727 jermar 232
/* Interface to be implemented by architectures. */
1891 jermar 233
#ifndef as_constructor_arch
234
extern int as_constructor_arch(as_t *as, int flags);
235
#endif /* !def as_constructor_arch */
236
#ifndef as_destructor_arch
237
extern int as_destructor_arch(as_t *as);
238
#endif /* !def as_destructor_arch */
239
#ifndef as_create_arch
240
extern int as_create_arch(as_t *as, int flags);
241
#endif /* !def as_create_arch */
703 jermar 242
#ifndef as_install_arch
243
extern void as_install_arch(as_t *as);
244
#endif /* !def as_install_arch */
1890 jermar 245
#ifndef as_deinstall_arch
246
extern void as_deinstall_arch(as_t *as);
247
#endif /* !def as_deinstall_arch */
1 jermar 248
 
2089 decky 249
/* Backend declarations and functions. */
1409 jermar 250
extern mem_backend_t anon_backend;
251
extern mem_backend_t elf_backend;
1424 jermar 252
extern mem_backend_t phys_backend;
1409 jermar 253
 
3222 svoboda 254
/**
255
 * This flags is passed when running the loader, otherwise elf_load()
256
 * would return with a EE_LOADER error code.
257
 */
258
#define ELD_F_NONE  0
259
#define ELD_F_LOADER    1
2089 decky 260
 
3222 svoboda 261
extern unsigned int elf_load(elf_header_t *header, as_t *as, int flags);
262
 
1235 jermar 263
/* Address space area related syscalls. */
1780 jermar 264
extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
265
extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
3222 svoboda 266
extern unative_t sys_as_area_change_flags(uintptr_t address, int flags);
1780 jermar 267
extern unative_t sys_as_area_destroy(uintptr_t address);
1235 jermar 268
 
1914 jermar 269
/* Introspection functions. */
270
extern void as_print(as_t *as);
271
 
1329 palkovsky 272
#endif /* KERNEL */
273
 
1 jermar 274
#endif
1702 cejka 275
 
1851 jermar 276
/** @}
1702 cejka 277
 */