headers/private/kernel/vm/vm_page.h

   1 /*
   2  * Copyright 2002-2009, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
   6  * Distributed under the terms of the NewOS License.
   7  */
   8 #ifndef _KERNEL_VM_VM_PAGE_H
   9 #define _KERNEL_VM_VM_PAGE_H
  10
  11
  12 #include <vm/vm.h>
  13 #include <vm/vm_types.h>
  14
  15
  16 struct kernel_args;
  17
  18 extern int32 gMappedPagesCount;
  19
  20
  21 struct vm_page_reservation {
  22         uint32  count;
  23 };
  24
  25
  26 #ifdef __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 void vm_page_init_num_pages(struct kernel_args *args);
  31 status_t vm_page_init(struct kernel_args *args);
  32 status_t vm_page_init_post_area(struct kernel_args *args);
  33 status_t vm_page_init_post_thread(struct kernel_args *args);
  34
  35 status_t vm_mark_page_inuse(page_num_t page);
  36 status_t vm_mark_page_range_inuse(page_num_t startPage, page_num_t length);
  37 void vm_page_free_etc(VMCache* cache, vm_page* page,
  38         vm_page_reservation* reservation);
  39
  40 void vm_page_set_state(struct vm_page *page, int state);
  41 void vm_page_requeue(struct vm_page *page, bool tail);
  42
  43 // get some data about the number of pages in the system
  44 page_num_t vm_page_num_pages(void);
  45 page_num_t vm_page_num_free_pages(void);
  46 page_num_t vm_page_num_available_pages(void);
  47 page_num_t vm_page_num_unused_pages(void);
  48 void vm_page_get_stats(system_info *info);
  49 phys_addr_t vm_page_max_address();
  50
  51 status_t vm_page_write_modified_page_range(struct VMCache *cache,
  52         uint32 firstPage, uint32 endPage);
  53 status_t vm_page_write_modified_pages(struct VMCache *cache);
  54 void vm_page_schedule_write_page(struct vm_page *page);
  55 void vm_page_schedule_write_page_range(struct VMCache *cache,
  56         uint32 firstPage, uint32 endPage);
  57
  58 void vm_page_unreserve_pages(vm_page_reservation* reservation);
  59 void vm_page_reserve_pages(vm_page_reservation* reservation, uint32 count,
  60         int priority);
  61 bool vm_page_try_reserve_pages(vm_page_reservation* reservation, uint32 count,
  62         int priority);
  63
  64 struct vm_page *vm_page_allocate_page(vm_page_reservation* reservation,
  65         uint32 flags);
  66 struct vm_page *vm_page_allocate_page_run(uint32 flags, page_num_t length,
  67         const physical_address_restrictions* restrictions, int priority);
  68 struct vm_page *vm_page_at_index(int32 index);
  69 struct vm_page *vm_lookup_page(page_num_t pageNumber);
  70 bool vm_page_is_dummy(struct vm_page *page);
  71
  72 #ifdef __cplusplus
  73 }
  74 #endif
  75
  76
  77 static inline void
  78 vm_page_free(struct VMCache *cache, struct vm_page *page)
  79 {
  80         vm_page_free_etc(cache, page, NULL);
  81 }
  82
  83
  84 #endif  /* _KERNEL_VM_VM_PAGE_H */