servers/vm/region.h

   1
   2 #ifndef _REGION_H
   3 #define _REGION_H 1
   4
   5 #include <minix/callnr.h>
   6 #include <minix/com.h>
   7 #include <minix/config.h>
   8 #include <minix/const.h>
   9 #include <minix/ds.h>
  10 #include <minix/endpoint.h>
  11 #include <minix/keymap.h>
  12 #include <minix/minlib.h>
  13 #include <minix/type.h>
  14 #include <minix/ipc.h>
  15 #include <minix/sysutil.h>
  16 #include <minix/syslib.h>
  17 #include <minix/const.h>
  18
  19 struct phys_block {
  20 #if SANITYCHECKS
  21         u32_t                   seencount;
  22 #endif
  23         vir_bytes               length; /* no. of contiguous bytes */
  24         phys_bytes              phys;   /* physical memory */
  25         u8_t                    refcount;       /* Refcount of these pages */
  26
  27         /* first in list of phys_regions that reference this block */
  28         struct phys_region      *firstregion;
  29 };
  30
  31 typedef struct phys_region {
  32         struct phys_block       *ph;
  33         struct vir_region       *parent; /* parent vir_region. */
  34         vir_bytes               offset; /* offset from start of vir region */
  35 #if SANITYCHECKS
  36         int                     written;        /* written to pagetable */
  37 #endif
  38
  39         /* list of phys_regions that reference the same phys_block */
  40         struct phys_region      *next_ph_list;
  41
  42         /* AVL fields */
  43         struct phys_region      *less, *greater;
  44         int                     factor;
  45 } phys_region_t;
  46
  47 #include "physravl.h"
  48
  49 struct vir_region {
  50         struct vir_region *next; /* next virtual region in this process */
  51         vir_bytes       vaddr;  /* virtual address, offset from pagetable */
  52         vir_bytes       length; /* length in bytes */
  53         physr_avl       *phys;  /* avl tree of physical memory blocks */
  54         u16_t           flags;
  55         u32_t tag;              /* Opaque to mapping code. */
  56         struct vmproc *parent;  /* Process that owns this vir_region. */
  57 };
  58
  59 /* Mapping flags: */
  60 #define VR_WRITABLE     0x001   /* Process may write here. */
  61 #define VR_NOPF         0x002   /* May not generate page faults. */
  62 #define VR_PHYS64K      0x004   /* Physical memory must be 64k aligned. */
  63 #define VR_LOWER16MB    0x008
  64 #define VR_LOWER1MB     0x010
  65
  66 /* Mapping type: */
  67 #define VR_ANON         0x100   /* Memory to be cleared and allocated */
  68 #define VR_DIRECT       0x200   /* Mapped, but not managed by VM */
  69 #define VR_SHARED       0x40
  70
  71 /* Tag values: */
  72 #define VRT_NONE        0xBEEF0000
  73 #define VRT_HEAP        0xBEEF0001
  74 #define VRT_CODE        0xBEEF0002
  75
  76 /* map_page_region flags */
  77 #define MF_PREALLOC     0x01
  78 #define MF_CONTIG       0x02
  79
  80 #endif
  81