sys/sys/vkernel.h

   1 /*
   2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/sys/vkernel.h,v 1.9 2007/06/29 21:54:14 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_VKERNEL_H_
  38 #define _SYS_VKERNEL_H_
  39
  40 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  41 /*
  42  * KERNEL ONLY DEFINITIONS
  43  */
  44
  45 #ifndef _SYS_PARAM_H_
  46 #include <sys/param.h>
  47 #endif
  48 #ifndef _SYS_QUEUE_H_
  49 #include <sys/queue.h>
  50 #endif
  51 #ifndef _SYS_TREE_H_
  52 #include <sys/tree.h>
  53 #endif
  54 #ifndef _SYS_SPINLOCK_H_
  55 #include <sys/spinlock.h>
  56 #endif
  57 #ifndef _MACHINE_FRAME_H_
  58 #include <machine/frame.h>
  59 #endif
  60 #ifndef _MACHINE_VFRAME_H_
  61 #include <machine/vframe.h>
  62 #endif
  63
  64 struct vmspace_rb_tree;
  65 struct vmspace_entry;
  66 RB_PROTOTYPE(vmspace_rb_tree, vmspace_entry, rb_entry, rb_vmspace_compare);
  67
  68 /*
  69  * Process operating as virtual kernels manage multiple VM spaces.  The
  70  * original VM space and trap context is saved in the process's vkernel
  71  * structure.
  72  */
  73 struct vkernel {
  74         struct trapframe vk_save_trapframe;     /* swapped context */
  75         struct vextframe vk_save_vextframe;
  76         struct trapframe *vk_user_trapframe;    /* copyback to vkernel */
  77         struct vextframe *vk_user_vextframe;
  78         struct vkernel_common *vk_common;       /* shared data */
  79 };
  80
  81 struct vkernel_common {
  82         RB_HEAD(vmspace_rb_tree, vmspace_entry) vc_root;
  83         struct spinlock vc_spin;
  84         int vc_refs;
  85 };
  86
  87 struct vmspace_entry {
  88         void *id;
  89         struct vmspace *vmspace;
  90         int flags;
  91         int refs;                               /* current LWP assignments */
  92         RB_ENTRY(vmspace_entry) rb_entry;
  93 };
  94
  95 #ifdef _KERNEL
  96
  97 void vkernel_inherit(struct proc *p1, struct proc *p2);
  98 void vkernel_exit(struct proc *p);
  99 int vkernel_trap(struct lwp *lp, struct trapframe *frame);
 100
 101 #endif
 102
 103 #else
 104 /*
 105  * USER ONLY DEFINITIONS
 106  */
 107
 108 #ifndef _MACHINE_PARAM_H_
 109 #include <machine/param.h>
 110 #endif
 111
 112 #endif
 113
 114 /*
 115  * KERNEL AND USER DEFINITIONS
 116  */
 117
 118 typedef u_int32_t       vpte_t;
 119
 120 #define VPTE_PAGE_ENTRIES       (PAGE_SIZE / sizeof(vpte_t))
 121 #define VPTE_PAGE_BITS          10
 122 #define VPTE_PAGE_MASK          ((1 << VPTE_PAGE_BITS) - 1)
 123 #define VPTE_PAGETABLE_SIZE     PAGE_SIZE
 124
 125 #define VPTE_V          0x00000001      /* valid */
 126 #define VPTE_PS         0x00000002      /* page directory direct mapping */
 127 #define VPTE_R          0x00000004      /* readable */
 128 #define VPTE_W          0x00000008      /* writable */
 129 #define VPTE_X          0x00000010      /* executable */
 130 #define VPTE_A          0x00000020      /* page accessed bit */
 131 #define VPTE_M          0x00000040      /* page modified bit */
 132 #define VPTE_U          0x00000080      /* user access bit if managed vmspace */
 133 #define VPTE_MANAGED    0x00000100      /* managed bit ?? */
 134 #define VPTE_G          0x00000200      /* global bit ?? */
 135 #define VPTE_WIRED      0x00000400      /* wired */
 136
 137 #define VPTE_FRAME      0xFFFFF000
 138
 139 #endif
 140