bootinfo64.c revision 162814
1/*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/boot/i386/libi386/bootinfo64.c 162814 2006-09-29 20:27:41Z ru $"); 29 30#include <stand.h> 31#include <sys/param.h> 32#include <sys/reboot.h> 33#include <sys/linker.h> 34#include <machine/bootinfo.h> 35#include "bootstrap.h" 36#include "libi386.h" 37#include "btxv86.h" 38 39/* 40 * Copy module-related data into the load area, where it can be 41 * used as a directory for loaded modules. 42 * 43 * Module data is presented in a self-describing format. Each datum 44 * is preceded by a 32-bit identifier and a 32-bit size field. 45 * 46 * Currently, the following data are saved: 47 * 48 * MOD_NAME (variable) module name (string) 49 * MOD_TYPE (variable) module type (string) 50 * MOD_ARGS (variable) module parameters (string) 51 * MOD_ADDR sizeof(vm_offset_t) module load address 52 * MOD_SIZE sizeof(size_t) module size 53 * MOD_METADATA (variable) type-specific metadata 54 */ 55#define COPY32(v, a, c) { \ 56 u_int32_t x = (v); \ 57 if (c) \ 58 i386_copyin(&x, a, sizeof(x)); \ 59 a += sizeof(x); \ 60} 61 62#define MOD_STR(t, a, s, c) { \ 63 COPY32(t, a, c); \ 64 COPY32(strlen(s) + 1, a, c); \ 65 if (c) \ 66 i386_copyin(s, a, strlen(s) + 1); \ 67 a += roundup(strlen(s) + 1, sizeof(u_int64_t));\ 68} 69 70#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c) 71#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c) 72#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c) 73 74#define MOD_VAR(t, a, s, c) { \ 75 COPY32(t, a, c); \ 76 COPY32(sizeof(s), a, c); \ 77 if (c) \ 78 i386_copyin(&s, a, sizeof(s)); \ 79 a += roundup(sizeof(s), sizeof(u_int64_t)); \ 80} 81 82#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c) 83#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c) 84 85#define MOD_METADATA(a, mm, c) { \ 86 COPY32(MODINFO_METADATA | mm->md_type, a, c); \ 87 COPY32(mm->md_size, a, c); \ 88 if (c) \ 89 i386_copyin(mm->md_data, a, mm->md_size); \ 90 a += roundup(mm->md_size, sizeof(u_int64_t));\ 91} 92 93#define MOD_END(a, c) { \ 94 COPY32(MODINFO_END, a, c); \ 95 COPY32(0, a, c); \ 96} 97 98static vm_offset_t 99bi_copymodules64(vm_offset_t addr) 100{ 101 struct preloaded_file *fp; 102 struct file_metadata *md; 103 int c; 104 u_int64_t v; 105 106 c = addr != 0; 107 /* start with the first module on the list, should be the kernel */ 108 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) { 109 110 MOD_NAME(addr, fp->f_name, c); /* this field must come first */ 111 MOD_TYPE(addr, fp->f_type, c); 112 if (fp->f_args) 113 MOD_ARGS(addr, fp->f_args, c); 114 v = fp->f_addr; 115 MOD_ADDR(addr, v, c); 116 v = fp->f_size; 117 MOD_SIZE(addr, v, c); 118 for (md = fp->f_metadata; md != NULL; md = md->md_next) 119 if (!(md->md_type & MODINFOMD_NOCOPY)) 120 MOD_METADATA(addr, md, c); 121 } 122 MOD_END(addr, c); 123 return(addr); 124} 125 126/* 127 * Load the information expected by an i386 kernel. 128 * 129 * - The 'boothowto' argument is constructed 130 * - The 'bootdev' argument is constructed 131 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 132 * - The kernel environment is copied into kernel space. 133 * - Module metadata are formatted and placed in kernel space. 134 */ 135int 136bi_load64(char *args, vm_offset_t *modulep, vm_offset_t *kernendp) 137{ 138 struct preloaded_file *xp, *kfp; 139 struct i386_devdesc *rootdev; 140 struct file_metadata *md; 141 vm_offset_t addr; 142 u_int64_t kernend; 143 u_int64_t envp; 144 vm_offset_t size; 145 char *rootdevname; 146 int howto; 147 148 howto = bi_getboothowto(args); 149 150 /* 151 * Allow the environment variable 'rootdev' to override the supplied device 152 * This should perhaps go to MI code and/or have $rootdev tested/set by 153 * MI code before launching the kernel. 154 */ 155 rootdevname = getenv("rootdev"); 156 i386_getdev((void **)(&rootdev), rootdevname, NULL); 157 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 158 printf("can't determine root device\n"); 159 return(EINVAL); 160 } 161 162 /* Try reading the /etc/fstab file to select the root device */ 163 getrootmount(i386_fmtdev((void *)rootdev)); 164 165 /* find the last module in the chain */ 166 addr = 0; 167 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 168 if (addr < (xp->f_addr + xp->f_size)) 169 addr = xp->f_addr + xp->f_size; 170 } 171 /* pad to a page boundary */ 172 addr = roundup(addr, PAGE_SIZE); 173 174 /* copy our environment */ 175 envp = addr; 176 addr = bi_copyenv(addr); 177 178 /* pad to a page boundary */ 179 addr = roundup(addr, PAGE_SIZE); 180 181 kfp = file_findfile(NULL, "elf kernel"); 182 if (kfp == NULL) 183 kfp = file_findfile(NULL, "elf64 kernel"); 184 if (kfp == NULL) 185 panic("can't find kernel file"); 186 kernend = 0; /* fill it in later */ 187 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 188 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 189 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 190 bios_addsmapdata(kfp); 191 192 /* Figure out the size and location of the metadata */ 193 *modulep = addr; 194 size = bi_copymodules64(0); 195 kernend = roundup(addr + size, PAGE_SIZE); 196 *kernendp = kernend; 197 198 /* patch MODINFOMD_KERNEND */ 199 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 200 bcopy(&kernend, md->md_data, sizeof kernend); 201 202 /* copy module list and metadata */ 203 (void)bi_copymodules64(addr); 204 205 return(0); 206} 207