Subversion Repositories HelenOS

Compare Revisions

Ignore whitespace Rev 2088 → Rev 2089

/trunk/kernel/generic/include/mm/as.h
47,7 → 47,6
#include <arch/mm/as.h>
#include <arch/mm/asid.h>
#include <arch/types.h>
#include <typedefs.h>
#include <synch/spinlock.h>
#include <synch/mutex.h>
#include <adt/list.h>
66,55 → 65,21
 
#define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */
 
/** Address space structure.
*
* as_t contains the list of as_areas of userspace accessible
* pages for one or more tasks. Ranges of kernel memory pages are not
* supposed to figure in the list as they are shared by all tasks and
* set up during system initialization.
*/
struct as {
/** Protected by asidlock. */
link_t inactive_as_with_asid_link;
/** Address space area attributes. */
#define AS_AREA_ATTR_NONE 0
#define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */
 
mutex_t lock;
#define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */
#define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */
#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
 
/** Number of references (i.e tasks that reference this as). */
count_t refcount;
 
/** Number of processors on wich is this address space active. */
count_t cpu_refcount;
 
/** B+tree of address space areas. */
btree_t as_area_btree;
 
/** Page table pointer. Constant on architectures that use global page hash table. */
pte_t *page_table;
 
/** Address space identifier. Constant on architectures that do not support ASIDs.*/
asid_t asid;
/** Architecture specific content. */
as_arch_t arch;
};
 
struct as_operations {
typedef struct {
pte_t *(* page_table_create)(int flags);
void (* page_table_destroy)(pte_t *page_table);
void (* page_table_lock)(as_t *as, bool lock);
void (* page_table_unlock)(as_t *as, bool unlock);
};
typedef struct as_operations as_operations_t;
} as_operations_t;
 
/** Address space area attributes. */
#define AS_AREA_ATTR_NONE 0
#define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */
 
#define AS_PF_FAULT 0 /**< The page fault was not resolved by as_page_fault(). */
#define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */
#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace()
or memcpy_to_uspace(). */
 
/** 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. */
122,15 → 87,17
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, uintptr_t addr, pf_access_t access);
void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
void (* share)(as_area_t *area);
} mem_backend_t;
/** Page fault access type. */
typedef enum {
PF_ACCESS_READ,
PF_ACCESS_WRITE,
PF_ACCESS_EXEC
} pf_access_t;
 
struct mem_backend;
 
/** Backend data stored in address space area. */
typedef union {
typedef union mem_backend_data {
struct { /**< elf_backend members */
elf_header_t *elf;
elf_segment_header_t *segment;
146,7 → 113,7
* Each as_area_t structure describes one contiguous area of virtual memory.
* In the future, it should not be difficult to support shared areas.
*/
struct as_area {
typedef struct {
mutex_t lock;
as_t *as; /**< Containing address space. */
int flags; /**< Flags related to the memory represented by the address space area. */
156,12 → 123,19
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. */
mem_backend_t *backend; /**< Memory backend backing this address space area. */
struct mem_backend *backend; /**< Memory backend backing this address space area. */
 
/** Data to be used by the backend. */
mem_backend_data_t backend_data;
};
} as_area_t;
 
/** Address space area backend structure. */
typedef struct mem_backend {
int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
void (* share)(as_area_t *area);
} mem_backend_t;
 
extern as_t *AS_KERNEL;
extern as_operations_t *as_operations;
 
206,11 → 180,13
extern void as_deinstall_arch(as_t *as);
#endif /* !def as_deinstall_arch */
 
/* Backend declarations. */
/* Backend declarations and functions. */
extern mem_backend_t anon_backend;
extern mem_backend_t elf_backend;
extern mem_backend_t phys_backend;
 
extern int elf_load(elf_header_t *header, as_t *as);
 
/* Address space area related syscalls. */
extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);