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 1.8 2007/01/08 19:45:39 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 vmspace *vk_save_vmspace; /* saved VM space */ 75 struct trapframe vk_save_trapframe; /* swapped context */ 76 struct vextframe vk_save_vextframe; 77 struct trapframe *vk_user_trapframe; /* copyback to vkernel */ 78 struct vextframe *vk_user_vextframe; 79 struct vkernel_common *vk_common; /* shared data */ 80 struct vmspace_entry *vk_current; 81 }; 82 83 struct vkernel_common { 84 RB_HEAD(vmspace_rb_tree, vmspace_entry) vc_root; 85 struct spinlock vc_spin; 86 int vc_refs; 87 }; 88 89 struct vmspace_entry { 90 void *id; 91 struct vmspace *vmspace; 92 int flags; 93 int refs; /* when vk_current */ 94 RB_ENTRY(vmspace_entry) rb_entry; 95 }; 96 97 #ifdef _KERNEL 98 99 void vkernel_inherit(struct proc *p1, struct proc *p2); 100 void vkernel_exit(struct proc *p); 101 int vkernel_trap(struct proc *p, struct trapframe *frame); 102 103 #endif 104 105 #else 106 /* 107 * USER ONLY DEFINITIONS 108 */ 109 110 #ifndef _MACHINE_PARAM_H_ 111 #include <machine/param.h> 112 #endif 113 114 #endif 115 116 /* 117 * KERNEL AND USER DEFINITIONS 118 */ 119 120 typedef u_int32_t vpte_t; 121 122 #define VPTE_PAGE_ENTRIES (PAGE_SIZE / sizeof(vpte_t)) 123 #define VPTE_PAGE_BITS 10 124 #define VPTE_PAGE_MASK ((1 << VPTE_PAGE_BITS) - 1) 125 #define VPTE_PAGETABLE_SIZE PAGE_SIZE 126 127 #define VPTE_V 0x00000001 /* valid */ 128 #define VPTE_PS 0x00000002 /* page directory direct mapping */ 129 #define VPTE_R 0x00000004 /* readable */ 130 #define VPTE_W 0x00000008 /* writable */ 131 #define VPTE_X 0x00000010 /* executable */ 132 #define VPTE_A 0x00000020 /* page accessed bit */ 133 #define VPTE_M 0x00000040 /* page modified bit */ 134 #define VPTE_U 0x00000080 /* user access bit if managed vmspace */ 135 #define VPTE_MANAGED 0x00000100 /* managed bit ?? */ 136 #define VPTE_G 0x00000200 /* global bit ?? */ 137 #define VPTE_WIRED 0x00000400 /* wired */ 138 139 #define VPTE_FRAME 0xFFFFF000 140 141 #endif 142 143