| 30,11 → 30,10 |
|---|
| #define __AS_H__ |
| |
| /** 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 |
| |
| #ifdef KERNEL |
| |
| 104,9 → 103,26 |
|---|
| #define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() |
| or memcpy_to_uspace(). */ |
| |
| 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; |
| |
| /** 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; |
| |
| /** Backend data stored in address space area. */ |
| typedef struct backend_data { |
| __native d1; |
| __native d2; |
| } mem_backend_data_t; |
| |
| /** 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. */ |
| }; |
| |
| /** 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; |
| }; |
| |
| 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; |
| |
| /* Address space area related syscalls. */ |
| extern __native sys_as_area_create(__address address, size_t size, int flags); |