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
  35 #ifndef _SYS_VKERNEL_H_
  36 #define _SYS_VKERNEL_H_
  37
  38 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  39 /*
  40  * KERNEL ONLY DEFINITIONS
  41  */
  42
  43 #ifndef _SYS_PARAM_H_
  44 #include <sys/param.h>
  45 #endif
  46 #ifndef _SYS_QUEUE_H_
  47 #include <sys/queue.h>
  48 #endif
  49 #ifndef _SYS_TREE_H_
  50 #include <sys/tree.h>
  51 #endif
  52 #ifndef _SYS_SPINLOCK_H_
  53 #include <sys/spinlock.h>
  54 #endif
  55 #ifndef _SYS_THREAD_H_
  56 #include <sys/thread.h>
  57 #endif
  58 #include <machine/frame.h>
  59 #include <machine/vframe.h>
  60 #include <machine/limits.h>
  61
  62 struct vmspace_rb_tree;
  63 struct vmspace_entry;
  64 struct lwp;
  65 RB_PROTOTYPE(vmspace_rb_tree, vmspace_entry, rb_entry, rb_vmspace_compare);
  66
  67 /*
  68  * Process operating as virtual kernels manage multiple VM spaces.  The
  69  * original VM space and trap context is saved in the process's vkernel
  70  * structure.
  71  */
  72 struct vkernel_lwp {
  73         struct trapframe save_trapframe;        /* swapped context */
  74         struct vextframe save_vextframe;
  75         struct trapframe *user_trapframe;       /* copyback to vkernel */
  76         struct vextframe *user_vextframe;
  77         struct vmspace_entry *ve;
  78         struct vmspace_entry *ve_cache;
  79 };
  80
  81 struct vkernel_proc {
  82         RB_HEAD(vmspace_rb_tree, vmspace_entry) root;
  83         struct lwkt_token token;
  84         int refs;
  85         register_t vkernel_cr3;
  86 };
  87
  88 struct vmspace_entry {
  89         void *id;
  90         struct vmspace *vmspace;
  91         uint32_t flags;
  92         uint32_t refs;                  /* in-use + 1(on-tree */
  93         uint32_t cache_refs;            /* cache count (separate) */
  94         RB_ENTRY(vmspace_entry) rb_entry;
  95 };
  96
  97 #define VKE_REF_DELETED 0x80000000U
  98
  99 #ifdef _KERNEL
 100
 101 void vkernel_inherit(struct proc *p1, struct proc *p2);
 102 void vkernel_exit(struct proc *p);
 103 void vkernel_lwp_exit(struct lwp *lp);
 104 void vkernel_trap(struct lwp *lp, struct trapframe *frame);
 105
 106 #endif
 107
 108 #else
 109 /*
 110  * USER ONLY DEFINITIONS
 111  */
 112
 113 #ifndef _MACHINE_PARAM_H_
 114 #include <machine/param.h>
 115 #endif
 116
 117 #endif
 118
 119 /*
 120  * KERNEL AND USER DEFINITIONS
 121  *
 122  * WARNING: vpte_t is 64 bits.  A 4-layer page table is used.
 123  */
 124 typedef u_long  vpte_t;
 125
 126 #if LONG_BIT == 32
 127 #define VPTE_FRAME_END          32
 128 #define VPTE_PAGE_BITS          10
 129 #define VPTE_FRAME              0xFFFFF000L
 130 #elif LONG_BIT == 64
 131 #define VPTE_FRAME_END          48
 132 #define VPTE_PAGE_BITS          9
 133 #define VPTE_FRAME              0x000FFFFFFFFFF000L
 134 #else
 135 #error "LONG_BIT not defined"
 136 #endif
 137
 138 #define VPTE_PAGE_ENTRIES       (PAGE_SIZE / sizeof(vpte_t))
 139 #define VPTE_PAGE_MASK          ((1 << VPTE_PAGE_BITS) - 1)
 140 #define VPTE_PAGETABLE_SIZE     PAGE_SIZE
 141
 142 #define VPTE_V          0x00000001      /* valid */
 143 #define VPTE_RW         0x00000002      /* read/write */
 144 #define VPTE_U          0x00000004      /* user access bit if managed vmspace */
 145
 146 #define VPTE_A          0x00000020      /* page accessed bit */
 147 #define VPTE_M          0x00000040      /* page modified bit */
 148 #define VPTE_PS         0x00000080      /* page directory direct mapping */
 149
 150 #define VPTE_G          0x00000100      /* global bit ?? */
 151 #define VPTE_WIRED      0x00000200      /* wired */
 152 #define VPTE_MANAGED    0x00000400      /* managed bit ?? */
 153 #define VPTE_NX         0x00000800      /* no-execute bit */
 154
 155 #endif
 156