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 <machine/metadata.h> 36 #include "bootstrap.h" 37 #include "libi386.h" 38 #include "btxv86.h" 39 40 #ifdef LOADER_GELI_SUPPORT 41 #include "geliboot.h" 42 #endif 43 44 static struct bootinfo bi; 45 46 /* 47 * Copy module-related data into the load area, where it can be 48 * used as a directory for loaded modules. 49 * 50 * Module data is presented in a self-describing format. Each datum 51 * is preceded by a 32-bit identifier and a 32-bit size field. 52 * 53 * Currently, the following data are saved: 54 * 55 * MOD_NAME (variable) module name (string) 56 * MOD_TYPE (variable) module type (string) 57 * MOD_ARGS (variable) module parameters (string) 58 * MOD_ADDR sizeof(vm_offset_t) module load address 59 * MOD_SIZE sizeof(size_t) module size 60 * MOD_METADATA (variable) type-specific metadata 61 */ 62 #define COPY32(v, a, c) { \ 63 uint32_t x = (v); \ 64 if (c) \ 65 i386_copyin(&x, a, sizeof(x)); \ 66 a += sizeof(x); \ 67 } 68 69 #define MOD_STR(t, a, s, c) { \ 70 COPY32(t, a, c); \ 71 COPY32(strlen(s) + 1, a, c); \ 72 if (c) \ 73 i386_copyin(s, a, strlen(s) + 1); \ 74 a += roundup(strlen(s) + 1, sizeof(u_long));\ 75 } 76 77 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c) 78 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c) 79 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c) 80 81 #define MOD_VAR(t, a, s, c) { \ 82 COPY32(t, a, c); \ 83 COPY32(sizeof(s), a, c); \ 84 if (c) \ 85 i386_copyin(&s, a, sizeof(s)); \ 86 a += roundup(sizeof(s), sizeof(u_long)); \ 87 } 88 89 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c) 90 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c) 91 92 #define MOD_METADATA(a, mm, c) { \ 93 COPY32(MODINFO_METADATA | mm->md_type, a, c); \ 94 COPY32(mm->md_size, a, c); \ 95 if (c) \ 96 i386_copyin(mm->md_data, a, mm->md_size); \ 97 a += roundup(mm->md_size, sizeof(u_long));\ 98 } 99 100 #define MOD_END(a, c) { \ 101 COPY32(MODINFO_END, a, c); \ 102 COPY32(0, a, c); \ 103 } 104 105 static vm_offset_t 106 bi_copymodules32(vm_offset_t addr) 107 { 108 struct preloaded_file *fp; 109 struct file_metadata *md; 110 int c; 111 112 c = addr != 0; 113 /* start with the first module on the list, should be the kernel */ 114 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) { 115 116 MOD_NAME(addr, fp->f_name, c); /* this field must come first */ 117 MOD_TYPE(addr, fp->f_type, c); 118 if (fp->f_args) 119 MOD_ARGS(addr, fp->f_args, c); 120 MOD_ADDR(addr, fp->f_addr, c); 121 MOD_SIZE(addr, fp->f_size, c); 122 for (md = fp->f_metadata; md != NULL; md = md->md_next) 123 if (!(md->md_type & MODINFOMD_NOCOPY)) 124 MOD_METADATA(addr, md, c); 125 } 126 MOD_END(addr, c); 127 return(addr); 128 } 129 130 /* 131 * Load the information expected by an i386 kernel. 132 * 133 * - The 'boothowto' argument is constructed 134 * - The 'bootdev' argument is constructed 135 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 136 * - The kernel environment is copied into kernel space. 137 * - Module metadata are formatted and placed in kernel space. 138 */ 139 int 140 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp) 141 { 142 struct preloaded_file *xp, *kfp; 143 struct i386_devdesc *rootdev; 144 struct file_metadata *md; 145 vm_offset_t addr; 146 vm_offset_t kernend; 147 vm_offset_t envp; 148 vm_offset_t size; 149 vm_offset_t ssym, esym; 150 char *rootdevname; 151 int bootdevnr, i, howto; 152 char *kernelname; 153 const char *kernelpath; 154 155 howto = bi_getboothowto(args); 156 157 /* 158 * Allow the environment variable 'rootdev' to override the supplied device 159 * This should perhaps go to MI code and/or have $rootdev tested/set by 160 * MI code before launching the kernel. 161 */ 162 rootdevname = getenv("rootdev"); 163 i386_getdev((void **)(&rootdev), rootdevname, NULL); 164 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 165 printf("can't determine root device\n"); 166 return(EINVAL); 167 } 168 169 /* Try reading the /etc/fstab file to select the root device */ 170 getrootmount(i386_fmtdev((void *)rootdev)); 171 172 /* Do legacy rootdev guessing */ 173 174 /* XXX - use a default bootdev of 0. Is this ok??? */ 175 bootdevnr = 0; 176 177 switch(rootdev->dd.d_dev->dv_type) { 178 case DEVT_CD: 179 case DEVT_DISK: 180 /* pass in the BIOS device number of the current disk */ 181 bi.bi_bios_dev = bd_unit2bios(rootdev); 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", 191 rootdev->dd.d_dev->dv_type); 192 } 193 if (bootdevnr == -1) { 194 printf("root device %s invalid\n", i386_fmtdev(rootdev)); 195 return (EINVAL); 196 } 197 free(rootdev); 198 199 /* find the last module in the chain */ 200 addr = 0; 201 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 202 if (addr < (xp->f_addr + xp->f_size)) 203 addr = xp->f_addr + xp->f_size; 204 } 205 /* pad to a page boundary */ 206 addr = roundup(addr, PAGE_SIZE); 207 208 /* copy our environment */ 209 envp = addr; 210 addr = bi_copyenv(addr); 211 212 /* pad to a page boundary */ 213 addr = roundup(addr, PAGE_SIZE); 214 215 kfp = file_findfile(NULL, "elf kernel"); 216 if (kfp == NULL) 217 kfp = file_findfile(NULL, "elf32 kernel"); 218 if (kfp == NULL) 219 panic("can't find kernel file"); 220 kernend = 0; /* fill it in later */ 221 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 222 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 223 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 224 bios_addsmapdata(kfp); 225 #ifdef LOADER_GELI_SUPPORT 226 geli_export_key_metadata(kfp); 227 #endif 228 229 /* Figure out the size and location of the metadata */ 230 *modulep = addr; 231 size = bi_copymodules32(0); 232 kernend = roundup(addr + size, PAGE_SIZE); 233 *kernendp = kernend; 234 235 /* patch MODINFOMD_KERNEND */ 236 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 237 bcopy(&kernend, md->md_data, sizeof kernend); 238 239 /* copy module list and metadata */ 240 (void)bi_copymodules32(addr); 241 242 ssym = esym = 0; 243 md = file_findmetadata(kfp, MODINFOMD_SSYM); 244 if (md != NULL) 245 ssym = *((vm_offset_t *)&(md->md_data)); 246 md = file_findmetadata(kfp, MODINFOMD_ESYM); 247 if (md != NULL) 248 esym = *((vm_offset_t *)&(md->md_data)); 249 if (ssym == 0 || esym == 0) 250 ssym = esym = 0; /* sanity */ 251 252 /* legacy bootinfo structure */ 253 kernelname = getenv("kernelname"); 254 i386_getdev(NULL, kernelname, &kernelpath); 255 bi.bi_version = BOOTINFO_VERSION; 256 bi.bi_kernelname = 0; /* XXX char * -> kernel name */ 257 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ 258 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ 259 for (i = 0; i < N_BIOS_GEOM; i++) 260 bi.bi_bios_geom[i] = bd_getbigeom(i); 261 bi.bi_size = sizeof(bi); 262 bi.bi_memsizes_valid = 1; 263 bi.bi_basemem = bios_basemem / 1024; 264 bi.bi_extmem = bios_extmem / 1024; 265 bi.bi_envp = envp; 266 bi.bi_modulep = *modulep; 267 bi.bi_kernend = kernend; 268 bi.bi_kernelname = VTOP(kernelpath); 269 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 270 bi.bi_esymtab = esym; 271 272 /* legacy boot arguments */ 273 *howtop = howto | RB_BOOTINFO; 274 *bootdevp = bootdevnr; 275 *bip = VTOP(&bi); 276 277 return(0); 278 } 279