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/vm/vm_vmspace.c,v 1.1 2006/09/03 17:11:51 dillon Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/kernel.h> 39 #include <sys/systm.h> 40 #include <sys/sysproto.h> 41 42 /* 43 * vmspace_ctl {void *id, void *ctx, int what } 44 * 45 * Create, destroy, or execute a VM space. This functions returns when 46 * the VM space has run for a specified period of time, a signal occurs, 47 * or the VM space traps or makes a system call. 48 * 49 * Execution of a VM space is accomplished by swapping out the caller's 50 * current VM space. Any signal or condition applicable to the caller 51 * will swap the caller's VM space back in for processing, then return 52 * EINTR. A trap, system call, or page fault in the VM space will swap 53 * the caller's VM space back in, adjust the context, and return the 54 * appropriate code. 55 * 56 * A virtual kernel manages multiple 'process' VM spaces this way, the 57 * real kernel only sees only the processes representing the virtual kernel 58 * itself, typically one per virtual cpu. 59 */ 60 int 61 sys_vmspace_ctl(struct vmspace_ctl_args *uap) 62 { 63 return (EINVAL); 64 } 65 66 /* 67 * vmspace_map { void *id, off_t offset, void *ptr, int bytes, int prot } 68 * 69 * Map pages backing the specified memory in the caller's context into 70 * the specified VM space and reduce their protection using 'prot'. A 71 * protection value of 0 removes the page mapping. Page mappings can be 72 * removed by the kernel at any time and cause execution of the VM space 73 * to return with VMSPACE_PAGEFAULT. 74 */ 75 int 76 sys_vmspace_map(struct vmspace_map_args *uap) 77 { 78 return (EINVAL); 79 } 80 81 /* 82 * vmspace_protect { void *id, off_t offset, int bytes, int prot } 83 * 84 * Adjust the protection of mapped pages in the specified VM context. Pages 85 * that are not mapped or whos mapping was removed by the kernel are not 86 * effected. 87 */ 88 int 89 sys_vmspace_protect(struct vmspace_protect_args *uap) 90 { 91 return (EINVAL); 92 } 93 94 /* 95 * vmspace_read { void *id, void *ptr, int bytes } 96 * 97 * Read data from the VM space. Only data in mapped pages can be read. If 98 * an unmapped page is encountered this function will return fewer then the 99 * requested number of bytes and the caller must map the additional pages 100 * before restarting the call. 101 */ 102 int 103 sys_vmspace_read(struct vmspace_read_args *uap) 104 { 105 return (EINVAL); 106 } 107 108 /* 109 * vmspace_write { void *id, const void *ptr, int bytes } 110 * 111 * Write data to the VM space. Only mapped, writable pages can be written. 112 * If an unmapped or read-only page is encountered this function will return 113 * fewer then the requested number of bytes and the caller must map the 114 * additional pages before restarting the call. 115 */ 116 int 117 sys_vmspace_write(struct vmspace_write_args *uap) 118 { 119 return (EINVAL); 120 } 121 122