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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genericmm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_AS_H_
  36. #define KERN_AS_H_
  37.  
  38. /** Address space area flags. */
  39. #define AS_AREA_READ        1
  40. #define AS_AREA_WRITE       2
  41. #define AS_AREA_EXEC        4
  42. #define AS_AREA_CACHEABLE   8
  43.  
  44. #ifdef KERNEL
  45.  
  46. #include <arch/mm/page.h>
  47. #include <arch/mm/as.h>
  48. #include <arch/mm/asid.h>
  49. #include <arch/types.h>
  50. #include <synch/spinlock.h>
  51. #include <synch/mutex.h>
  52. #include <adt/list.h>
  53. #include <adt/btree.h>
  54. #include <lib/elf.h>
  55.  
  56. #ifdef __OBJC__
  57. #include <lib/objc.h>
  58. #endif
  59.  
  60. /**
  61.  * Defined to be true if user address space and kernel address space shadow each
  62.  * other.
  63.  */
  64. #define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
  65.  
  66. #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
  67. #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
  68. #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
  69. #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
  70.  
  71. #define USTACK_ADDRESS          USTACK_ADDRESS_ARCH
  72.  
  73. /** Kernel address space. */
  74. #define FLAG_AS_KERNEL          (1 << 0)   
  75.  
  76. /* Address space area attributes. */
  77. #define AS_AREA_ATTR_NONE   0
  78. #define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
  79.  
  80. /** The page fault was not resolved by as_page_fault(). */
  81. #define AS_PF_FAULT     0
  82. /** The page fault was resolved by as_page_fault(). */
  83. #define AS_PF_OK        1
  84. /** The page fault was caused by memcpy_from_uspace() or memcpy_to_uspace(). */
  85. #define AS_PF_DEFER     2
  86.  
  87. #ifdef __OBJC__
  88. @interface as_t : base_t {
  89.     @public
  90.         /** Protected by asidlock. */
  91.         link_t inactive_as_with_asid_link;
  92.         /**
  93.          * Number of processors on wich is this address space active.
  94.          * Protected by asidlock.
  95.          */
  96.         count_t cpu_refcount;
  97.         /**
  98.          * Address space identifier.
  99.          * Constant on architectures that do not support ASIDs.
  100.          * Protected by asidlock.  
  101.          */
  102.         asid_t asid;
  103.        
  104.         /** Number of references (i.e tasks that reference this as). */
  105.         atomic_t refcount;
  106.  
  107.         mutex_t lock;
  108.        
  109.         /** B+tree of address space areas. */
  110.         btree_t as_area_btree;
  111.        
  112.         /** Non-generic content. */
  113.         as_genarch_t genarch;
  114.        
  115.         /** Architecture specific content. */
  116.         as_arch_t arch;
  117. }
  118.  
  119. + (pte_t *) page_table_create: (int) flags;
  120. + (void) page_table_destroy: (pte_t *) page_table;
  121. - (void) page_table_lock: (bool) _lock;
  122. - (void) page_table_unlock: (bool) unlock;
  123.  
  124. @end
  125.  
  126. #else
  127.  
  128. /** Address space structure.
  129.  *
  130.  * as_t contains the list of as_areas of userspace accessible
  131.  * pages for one or more tasks. Ranges of kernel memory pages are not
  132.  * supposed to figure in the list as they are shared by all tasks and
  133.  * set up during system initialization.
  134.  */
  135. typedef struct as {
  136.     /** Protected by asidlock. */
  137.     link_t inactive_as_with_asid_link;
  138.     /**
  139.      * Number of processors on wich is this address space active.
  140.      * Protected by asidlock.
  141.      */
  142.     count_t cpu_refcount;
  143.     /**
  144.      * Address space identifier.
  145.      * Constant on architectures that do not support ASIDs.
  146.      * Protected by asidlock.
  147.      */
  148.     asid_t asid;
  149.  
  150.     /** Number of references (i.e tasks that reference this as). */
  151.     atomic_t refcount;
  152.  
  153.     mutex_t lock;
  154.  
  155.     /** B+tree of address space areas. */
  156.     btree_t as_area_btree;
  157.    
  158.     /** Non-generic content. */
  159.     as_genarch_t genarch;
  160.  
  161.     /** Architecture specific content. */
  162.     as_arch_t arch;
  163. } as_t;
  164.  
  165. typedef struct {
  166.     pte_t *(* page_table_create)(int flags);
  167.     void (* page_table_destroy)(pte_t *page_table);
  168.     void (* page_table_lock)(as_t *as, bool lock);
  169.     void (* page_table_unlock)(as_t *as, bool unlock);
  170. } as_operations_t;
  171. #endif
  172.  
  173. /**
  174.  * This structure contains information associated with the shared address space
  175.  * area.
  176.  */
  177. typedef struct {
  178.     /** This lock must be acquired only when the as_area lock is held. */
  179.     mutex_t lock;      
  180.     /** This structure can be deallocated if refcount drops to 0. */
  181.     count_t refcount;
  182.     /**
  183.      * B+tree containing complete map of anonymous pages of the shared area.
  184.      */
  185.     btree_t pagemap;
  186. } share_info_t;
  187.  
  188. /** Page fault access type. */
  189. typedef enum {
  190.     PF_ACCESS_READ,
  191.     PF_ACCESS_WRITE,
  192.     PF_ACCESS_EXEC
  193. } pf_access_t;
  194.  
  195. struct mem_backend;
  196.  
  197. /** Backend data stored in address space area. */
  198. typedef union mem_backend_data {
  199.     struct {    /**< elf_backend members */
  200.         elf_header_t *elf;
  201.         elf_segment_header_t *segment;
  202.     };
  203.     struct {    /**< phys_backend members */
  204.         uintptr_t base;
  205.         count_t frames;
  206.     };
  207. } mem_backend_data_t;
  208.  
  209. /** Address space area structure.
  210.  *
  211.  * Each as_area_t structure describes one contiguous area of virtual memory.
  212.  */
  213. typedef struct {
  214.     mutex_t lock;
  215.     /** Containing address space. */
  216.     as_t *as;      
  217.     /**
  218.      * Flags related to the memory represented by the address space area.
  219.      */
  220.     int flags;
  221.     /** Attributes related to the address space area itself. */
  222.     int attributes;
  223.     /** Size of this area in multiples of PAGE_SIZE. */
  224.     count_t pages;
  225.     /** Base address of this area. */
  226.     uintptr_t base;
  227.     /** Map of used space. */
  228.     btree_t used_space;
  229.  
  230.     /**
  231.      * If the address space area has been shared, this pointer will
  232.      * reference the share info structure.
  233.      */
  234.     share_info_t *sh_info;
  235.  
  236.     /** Memory backend backing this address space area. */
  237.     struct mem_backend *backend;
  238.  
  239.     /** Data to be used by the backend. */
  240.     mem_backend_data_t backend_data;
  241. } as_area_t;
  242.  
  243. /** Address space area backend structure. */
  244. typedef struct mem_backend {
  245.     int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
  246.     void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
  247.     void (* share)(as_area_t *area);
  248. } mem_backend_t;
  249.  
  250. extern as_t *AS_KERNEL;
  251.  
  252. #ifndef __OBJC__
  253. extern as_operations_t *as_operations;
  254. #endif
  255.  
  256. extern link_t inactive_as_with_asid_head;
  257.  
  258. extern void as_init(void);
  259.  
  260. extern as_t *as_create(int flags);
  261. extern void as_destroy(as_t *as);
  262. extern void as_switch(as_t *old_as, as_t *new_as);
  263. extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
  264.  
  265. extern as_area_t *as_area_create(as_t *as, int flags, size_t size,
  266.     uintptr_t base, int attrs, mem_backend_t *backend,
  267.     mem_backend_data_t *backend_data);
  268. extern int as_area_destroy(as_t *as, uintptr_t address);   
  269. extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
  270. int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
  271.     as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
  272. extern int as_area_change_flags(as_t *as, int flags, uintptr_t address);
  273.  
  274. extern int as_area_get_flags(as_area_t *area);
  275. extern bool as_area_check_access(as_area_t *area, pf_access_t access);
  276. extern size_t as_area_get_size(uintptr_t base);
  277. extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
  278. extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
  279.  
  280.  
  281. /* Interface to be implemented by architectures. */
  282. #ifndef as_constructor_arch
  283. extern int as_constructor_arch(as_t *as, int flags);
  284. #endif /* !def as_constructor_arch */
  285. #ifndef as_destructor_arch
  286. extern int as_destructor_arch(as_t *as);
  287. #endif /* !def as_destructor_arch */
  288. #ifndef as_create_arch
  289. extern int as_create_arch(as_t *as, int flags);
  290. #endif /* !def as_create_arch */
  291. #ifndef as_install_arch
  292. extern void as_install_arch(as_t *as);
  293. #endif /* !def as_install_arch */
  294. #ifndef as_deinstall_arch
  295. extern void as_deinstall_arch(as_t *as);
  296. #endif /* !def as_deinstall_arch */
  297.  
  298. /* Backend declarations and functions. */
  299. extern mem_backend_t anon_backend;
  300. extern mem_backend_t elf_backend;
  301. extern mem_backend_t phys_backend;
  302.  
  303. extern unsigned int elf_load(elf_header_t *header, as_t *as);
  304.  
  305. /* Address space area related syscalls. */
  306. extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
  307. extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
  308. extern unative_t sys_as_area_change_flags(uintptr_t address, int flags);
  309. extern unative_t sys_as_area_destroy(uintptr_t address);
  310.  
  311. /* Introspection functions. */
  312. extern void as_print(as_t *as);
  313.  
  314. #endif /* KERNEL */
  315.  
  316. #endif
  317.  
  318. /** @}
  319.  */
  320.