WebSVN – HelenOS – Diff – /trunk/kernel/generic/include/mm/as.h

 /*
  * Copyright (c) 2001-2004 Jakub Jermar
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
+ *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * - Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in the
  *   documentation and/or other materials provided with the distribution.
  * - The name of the author may not be used to endorse or promote products
  *   derived from this software without specific prior written permission.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 /** @addtogroup genericmm
  * @{
  */
 /** @file
  */
 #ifndef KERN_AS_H_
 #define KERN_AS_H_
 /** Address space area flags. */
 #define AS_AREA_READ        1
 #define AS_AREA_WRITE       2
 #define AS_AREA_EXEC        4
 #define AS_AREA_CACHEABLE   8
 #ifdef KERNEL
 #include <arch/mm/page.h>
 #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>
 #include <adt/btree.h>
 #include <lib/elf.h>
 /** Defined to be true if user address space and kernel address space shadow each other. */
 #define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
 #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
 #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
 #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
 #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
 #define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
 #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;
-    mutex_t lock;
-    /** 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 {
-    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;
 /** 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()
+#define AS_PF_DEFER     2   /**< The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
+typedef struct {
-                         or memcpy_to_uspace(). */
+    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);
+} as_operations_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. */
+/** Page fault access type. */
-typedef struct {
+typedef enum {
-    int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
+    PF_ACCESS_READ,
-    void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
+    PF_ACCESS_WRITE,
+    PF_ACCESS_EXEC
-    void (* share)(as_area_t *area);
+} pf_access_t;
-} mem_backend_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;
     };
     struct {    /**< phys_backend members */
         uintptr_t base;
         count_t frames;
     };
 } mem_backend_data_t;
 /** Address space area structure.
+ *
  * 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. */
     int attributes;     /**< Attributes related to the address space area itself. */
     count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
     uintptr_t 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. */
-    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;
 extern spinlock_t inactive_as_with_asid_lock;
 extern link_t inactive_as_with_asid_head;
 extern void as_init(void);
 extern as_t *as_create(int flags);
 extern void as_destroy(as_t *as);
 extern void as_switch(as_t *old, as_t *new);
 extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
 extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs,
     mem_backend_t *backend, mem_backend_data_t *backend_data);
 extern int as_area_destroy(as_t *as, uintptr_t address);
 extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
 int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
           as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
 extern int as_area_get_flags(as_area_t *area);
 extern bool as_area_check_access(as_area_t *area, pf_access_t access);
 extern size_t as_get_size(uintptr_t base);
 extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
 extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
 /* Interface to be implemented by architectures. */
 #ifndef as_constructor_arch
 extern int as_constructor_arch(as_t *as, int flags);
 #endif /* !def as_constructor_arch */
 #ifndef as_destructor_arch
 extern int as_destructor_arch(as_t *as);
 #endif /* !def as_destructor_arch */
 #ifndef as_create_arch
 extern int as_create_arch(as_t *as, int flags);
 #endif /* !def as_create_arch */
 #ifndef as_install_arch
 extern void as_install_arch(as_t *as);
 #endif /* !def as_install_arch */
 #ifndef as_deinstall_arch
 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);
 extern unative_t sys_as_area_destroy(uintptr_t address);
 /* Introspection functions. */
 extern void as_print(as_t *as);
 #endif /* KERNEL */
 #endif
 /** @}
  */

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/include/mm/as.h – Rev 2071 → 2089