30,11 → 30,10 |
#define __AS_H__ |
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/** Address space area flags. */ |
#define AS_AREA_READ 1 |
#define AS_AREA_WRITE 2 |
#define AS_AREA_EXEC 4 |
#define AS_AREA_DEVICE 8 |
#define AS_AREA_ANON 16 |
#define AS_AREA_READ 1 |
#define AS_AREA_WRITE 2 |
#define AS_AREA_EXEC 4 |
#define AS_AREA_CACHEABLE 8 |
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#ifdef KERNEL |
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104,9 → 103,26 |
#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() |
or memcpy_to_uspace(). */ |
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typedef struct share_info share_info_t; |
typedef struct mem_backend mem_backend_t; |
/** This structure contains information associated with the shared address space area. */ |
typedef struct { |
mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
} share_info_t; |
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/** Address space area backend structure. */ |
typedef struct { |
int (* page_fault)(as_area_t *area, __address addr, pf_access_t access); |
void (* frame_free)(as_area_t *area, __address page, __address frame); |
void (* share)(as_area_t *area); |
} mem_backend_t; |
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/** Backend data stored in address space area. */ |
typedef struct backend_data { |
__native d1; |
__native d2; |
} mem_backend_data_t; |
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/** Address space area structure. |
* |
* Each as_area_t structure describes one contiguous area of virtual memory. |
114,6 → 130,7 |
*/ |
struct as_area { |
mutex_t lock; |
as_t *as; /**< Containing address space. */ |
int flags; /**< Flags related to the memory represented by the address space area. */ |
int attributes; /**< Attributes related to the address space area itself. */ |
count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
120,15 → 137,11 |
__address base; /**< Base address of this area. */ |
btree_t used_space; /**< Map of used space. */ |
share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
reference the share info structure. */ |
reference the share info structure. */ |
mem_backend_t *backend; /**< Memory backend backing this address space area. */ |
void *backend_data[2]; /**< Data to be used by the backend. */ |
}; |
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/** Address space area backend structure. */ |
struct mem_backend { |
int (* backend_page_fault)(as_area_t *area, __address addr, pf_access_t access); |
void (* backend_frame_free)(as_area_t *area, __address page, __address frame); |
/** Data to be used by the backend. */ |
mem_backend_data_t backend_data; |
}; |
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extern as_t *AS_KERNEL; |
140,11 → 153,10 |
extern void as_init(void); |
extern as_t *as_create(int flags); |
extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs, |
mem_backend_t *backend, void **backend_data); |
mem_backend_t *backend, mem_backend_data_t *backend_data); |
extern int as_area_resize(as_t *as, __address address, size_t size, int flags); |
extern int as_area_destroy(as_t *as, __address address); |
extern int as_area_get_flags(as_area_t *area); |
extern void as_set_mapping(as_t *as, __address page, __address frame); |
extern bool as_area_check_access(as_area_t *area, pf_access_t access); |
extern int as_page_fault(__address page, pf_access_t access, istate_t *istate); |
extern void as_switch(as_t *old, as_t *new); |
163,6 → 175,7 |
/* Backend declarations. */ |
extern mem_backend_t anon_backend; |
extern mem_backend_t elf_backend; |
extern mem_backend_t phys_backend; |
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/* Address space area related syscalls. */ |
extern __native sys_as_area_create(__address address, size_t size, int flags); |