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("$FreeBSD$"); 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 39static struct bootinfo bi; 40 41/* 42 * Copy module-related data into the load area, where it can be 43 * used as a directory for loaded modules. 44 * 45 * Module data is presented in a self-describing format. Each datum 46 * is preceded by a 32-bit identifier and a 32-bit size field. 47 * 48 * Currently, the following data are saved: 49 * 50 * MOD_NAME (variable) module name (string) 51 * MOD_TYPE (variable) module type (string) 52 * MOD_ARGS (variable) module parameters (string) 53 * MOD_ADDR sizeof(vm_offset_t) module load address 54 * MOD_SIZE sizeof(size_t) module size 55 * MOD_METADATA (variable) type-specific metadata 56 */ 57#define COPY32(v, a, c) { \ 58 u_int32_t x = (v); \ 59 if (c) \ 60 i386_copyin(&x, a, sizeof(x)); \ 61 a += sizeof(x); \ 62} 63 64#define MOD_STR(t, a, s, c) { \ 65 COPY32(t, a, c); \ 66 COPY32(strlen(s) + 1, a, c); \ 67 if (c) \ 68 i386_copyin(s, a, strlen(s) + 1); \ 69 a += roundup(strlen(s) + 1, sizeof(u_long));\ 70} 71 72#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c) 73#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c) 74#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c) 75 76#define MOD_VAR(t, a, s, c) { \ 77 COPY32(t, a, c); \ 78 COPY32(sizeof(s), a, c); \ 79 if (c) \ 80 i386_copyin(&s, a, sizeof(s)); \ 81 a += roundup(sizeof(s), sizeof(u_long)); \ 82} 83 84#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c) 85#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c) 86 87#define MOD_METADATA(a, mm, c) { \ 88 COPY32(MODINFO_METADATA | mm->md_type, a, c); \ 89 COPY32(mm->md_size, a, c); \ 90 if (c) \ 91 i386_copyin(mm->md_data, a, mm->md_size); \ 92 a += roundup(mm->md_size, sizeof(u_long));\ 93} 94 95#define MOD_END(a, c) { \ 96 COPY32(MODINFO_END, a, c); \ 97 COPY32(0, a, c); \ 98} 99 100static vm_offset_t 101bi_copymodules32(vm_offset_t addr) 102{ 103 struct preloaded_file *fp; 104 struct file_metadata *md; 105 int c; 106 107 c = addr != 0; 108 /* start with the first module on the list, should be the kernel */ 109 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) { 110 111 MOD_NAME(addr, fp->f_name, c); /* this field must come first */ 112 MOD_TYPE(addr, fp->f_type, c); 113 if (fp->f_args) 114 MOD_ARGS(addr, fp->f_args, c); 115 MOD_ADDR(addr, fp->f_addr, c); 116 MOD_SIZE(addr, fp->f_size, c); 117 for (md = fp->f_metadata; md != NULL; md = md->md_next) 118 if (!(md->md_type & MODINFOMD_NOCOPY)) 119 MOD_METADATA(addr, md, c); 120 } 121 MOD_END(addr, c); 122 return(addr); 123} 124 125/* 126 * Load the information expected by an i386 kernel. 127 * 128 * - The 'boothowto' argument is constructed 129 * - The 'bootdev' argument is constructed 130 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 131 * - The kernel environment is copied into kernel space. 132 * - Module metadata are formatted and placed in kernel space. 133 */ 134int 135bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp) 136{ 137 struct preloaded_file *xp, *kfp; 138 struct i386_devdesc *rootdev; 139 struct file_metadata *md; 140 vm_offset_t addr; 141 vm_offset_t kernend; 142 vm_offset_t envp; 143 vm_offset_t size; 144 vm_offset_t ssym, esym; 145 char *rootdevname; 146 int bootdevnr, i, howto; 147 char *kernelname; 148 const char *kernelpath; 149 150 howto = bi_getboothowto(args); 151 152 /* 153 * Allow the environment variable 'rootdev' to override the supplied device 154 * This should perhaps go to MI code and/or have $rootdev tested/set by 155 * MI code before launching the kernel. 156 */ 157 rootdevname = getenv("rootdev"); 158 i386_getdev((void **)(&rootdev), rootdevname, NULL); 159 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 160 printf("can't determine root device\n"); 161 return(EINVAL); 162 } 163 164 /* Try reading the /etc/fstab file to select the root device */ 165 getrootmount(i386_fmtdev((void *)rootdev)); 166 167 /* Do legacy rootdev guessing */ 168 169 /* XXX - use a default bootdev of 0. Is this ok??? */ 170 bootdevnr = 0; 171 172 switch(rootdev->d_type) { 173 case DEVT_CD: 174 /* Pass in BIOS device number. */ 175 bi.bi_bios_dev = bc_unit2bios(rootdev->d_unit); 176 bootdevnr = bc_getdev(rootdev); 177 break; 178 179 case DEVT_DISK: 180 /* pass in the BIOS device number of the current disk */ 181 bi.bi_bios_dev = bd_unit2bios(rootdev->d_unit); 182 bootdevnr = bd_getdev(rootdev); 183 break; 184 185 case DEVT_NET: 186 case DEVT_ZFS: 187 break; 188 189 default: 190 printf("WARNING - don't know how to boot from device type %d\n", rootdev->d_type); 191 } 192 if (bootdevnr == -1) { 193 printf("root device %s invalid\n", i386_fmtdev(rootdev)); 194 return (EINVAL); 195 } 196 free(rootdev); 197 198 /* find the last module in the chain */ 199 addr = 0; 200 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 201 if (addr < (xp->f_addr + xp->f_size)) 202 addr = xp->f_addr + xp->f_size; 203 } 204 /* pad to a page boundary */ 205 addr = roundup(addr, PAGE_SIZE); 206 207 /* copy our environment */ 208 envp = addr; 209 addr = bi_copyenv(addr); 210 211 /* pad to a page boundary */ 212 addr = roundup(addr, PAGE_SIZE); 213 214 kfp = file_findfile(NULL, "elf kernel"); 215 if (kfp == NULL) 216 kfp = file_findfile(NULL, "elf32 kernel"); 217 if (kfp == NULL) 218 panic("can't find kernel file"); 219 kernend = 0; /* fill it in later */ 220 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 221 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 222 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 223 bios_addsmapdata(kfp); 224 225 /* Figure out the size and location of the metadata */ 226 *modulep = addr; 227 size = bi_copymodules32(0); 228 kernend = roundup(addr + size, PAGE_SIZE); 229 *kernendp = kernend; 230 231 /* patch MODINFOMD_KERNEND */ 232 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 233 bcopy(&kernend, md->md_data, sizeof kernend); 234 235 /* copy module list and metadata */ 236 (void)bi_copymodules32(addr); 237 238 ssym = esym = 0; 239 md = file_findmetadata(kfp, MODINFOMD_SSYM); 240 if (md != NULL) 241 ssym = *((vm_offset_t *)&(md->md_data)); 242 md = file_findmetadata(kfp, MODINFOMD_ESYM); 243 if (md != NULL) 244 esym = *((vm_offset_t *)&(md->md_data)); 245 if (ssym == 0 || esym == 0) 246 ssym = esym = 0; /* sanity */ 247 248 /* legacy bootinfo structure */ 249 kernelname = getenv("kernelname"); 250 i386_getdev(NULL, kernelname, &kernelpath); 251 bi.bi_version = BOOTINFO_VERSION; 252 bi.bi_kernelname = 0; /* XXX char * -> kernel name */ 253 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ 254 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ 255 for (i = 0; i < N_BIOS_GEOM; i++) 256 bi.bi_bios_geom[i] = bd_getbigeom(i); 257 bi.bi_size = sizeof(bi); 258 bi.bi_memsizes_valid = 1; 259 bi.bi_basemem = bios_basemem / 1024; 260 bi.bi_extmem = bios_extmem / 1024; 261 bi.bi_envp = envp; 262 bi.bi_modulep = *modulep; 263 bi.bi_kernend = kernend; 264 bi.bi_kernelname = VTOP(kernelpath); 265 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 266 bi.bi_esymtab = esym; 267 268 /* legacy boot arguments */ 269 *howtop = howto | RB_BOOTINFO; 270 *bootdevp = bootdevnr; 271 *bip = VTOP(&bi); 272 273 return(0); 274} 275