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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. #ifndef __VM_H__
  30. #define __VM_H__
  31.  
  32. #include <arch/mm/page.h>
  33. #include <arch/mm/vm.h>
  34. #include <arch/types.h>
  35. #include <typedefs.h>
  36. #include <synch/spinlock.h>
  37. #include <list.h>
  38.  
  39. #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
  40. #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
  41. #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
  42. #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
  43.  
  44. #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
  45.  
  46. #define UTEXT_ADDRESS   UTEXT_ADDRESS_ARCH
  47. #define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
  48. #define UDATA_ADDRESS   UDATA_ADDRESS_ARCH
  49.  
  50. enum vm_type {
  51.     VMA_TEXT = 1, VMA_DATA, VMA_STACK
  52. };
  53.  
  54. /*
  55.  * Each vm_area_t structure describes one continuous area of virtual memory.
  56.  * In the future, it should not be difficult to support shared areas of vm.
  57.  */
  58. struct vm_area {
  59.     spinlock_t lock;
  60.     link_t link;
  61.     vm_type_t type;
  62.     int size;
  63.     __address address;
  64.     __address *mapping;
  65. };
  66.  
  67. /*
  68.  * vm_t contains the list of vm_areas of userspace accessible
  69.  * pages for one or more tasks. Ranges of kernel memory pages are not
  70.  * supposed to figure in the list as they are shared by all tasks and
  71.  * set up during system initialization.
  72.  */
  73. struct vm {
  74.     spinlock_t lock;
  75.     link_t vm_area_head;
  76.     pte_t *ptl0;
  77. };
  78.  
  79. extern vm_t * vm_create(pte_t *ptl0);
  80. extern void vm_destroy(vm_t *m);
  81.  
  82. extern vm_area_t *vm_area_create(vm_t *m, vm_type_t type, size_t size, __address addr);
  83. extern void vm_area_destroy(vm_area_t *a);
  84.  
  85. extern void vm_area_map(vm_area_t *a, vm_t *m);
  86. extern void vm_area_unmap(vm_area_t *a, vm_t *m);
  87.  
  88. extern void vm_install(vm_t *m);
  89. extern void vm_uninstall(vm_t *m);
  90.  
  91. #endif
  92.