include/kernel/vm_priv.h

   1 /*
   2 ** Copyright 2001-2004, Travis Geiselbrecht. All rights reserved.
   3 ** Distributed under the terms of the NewOS License.
   4 */
   5 #ifndef _KERNEL_VM_PRIV_H
   6 #define _KERNEL_VM_PRIV_H
   7
   8 #include <kernel/vm.h>
   9 #include <kernel/khash.h>
  10
  11 /* should make these scale with the system */
  12 #define DEFAULT_KERNEL_WORKING_SET  1024
  13 #define DEFAULT_WORKING_SET         256
  14 #define DEFAULT_MAX_WORKING_SET     65536
  15 #define DEFAULT_MIN_WORKING_SET     64
  16
  17 #define WORKING_SET_INCREMENT       32
  18 #define WORKING_SET_DECREMENT       32
  19
  20 #define PAGE_DAEMON_INTERVAL 5000000
  21 #define PAGE_SCAN_QUANTUM 500
  22 #define WORKING_SET_ADJUST_INTERVAL 5000000
  23 #define MAX_FAULTS_PER_SECOND 100
  24 #define MIN_FAULTS_PER_SECOND 10
  25
  26 #define WRITE_COUNT 1024
  27 #define READ_COUNT 1
  28
  29 // page attributes
  30 #define PAGE_MODIFIED 0x04
  31 #define PAGE_ACCESSED 0x08
  32 #define PAGE_PRESENT  0x10
  33
  34 // Should only be used by vm internals
  35 int vm_page_fault(addr_t address, addr_t fault_address, bool is_write, bool is_user, addr_t *newip);
  36 void vm_increase_max_commit(addr_t delta);
  37 int vm_daemon_init(void);
  38
  39 // used by the page daemon to walk the list of address spaces
  40 int vm_aspace_walk_start(struct hash_iterator *i);
  41 vm_address_space *vm_aspace_walk_next(struct hash_iterator *i);
  42
  43 // get some data about the number of pages in the system
  44 addr_t vm_page_num_pages(void);
  45 addr_t vm_page_num_free_pages(void);
  46
  47 // allocates memory from the ka structure
  48 addr_t vm_alloc_from_ka_struct(kernel_args *ka, unsigned int size, int lock);
  49 addr_t vm_alloc_ppage_from_kernel_struct(kernel_args *ka);
  50
  51 // a global structure holding data about the vm for informational purposes
  52 extern vm_info_t vm_info;
  53
  54 // minimal consistency checks
  55 #define VERIFY_VM_PAGE(page) ASSERT((page) && (page)->magic == VM_PAGE_MAGIC)
  56 #define VERIFY_VM_CACHE_REF(ref) ASSERT((ref) && (ref)->magic == VM_CACHE_REF_MAGIC && (ref)->ref_count >= 0)
  57 #define VERIFY_VM_CACHE(cache) ASSERT((cache) && (cache)->magic == VM_CACHE_MAGIC)
  58 #define VERIFY_VM_REGION(region) ASSERT((region) && (region)->magic == VM_REGION_MAGIC && (region)->ref_count >= 0)
  59 #define VERIFY_VM_ASPACE(aspace) ASSERT((aspace) && (aspace)->magic == VM_ASPACE_MAGIC && (aspace)->ref_count >= 0)
  60 #define VERIFY_VM_STORE(store) ASSERT((store) && (store)->magic == VM_STORE_MAGIC)
  61
  62 #endif
  63