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 29 #include <stand.h> 30 #include <sys/param.h> 31 #include <sys/reboot.h> 32 #include <sys/linker.h> 33 #include <machine/bootinfo.h> 34 #include "bootstrap.h" 35 #include "libi386.h" 36 #include "btxv86.h" 37 38 static struct bootinfo bi; 39 40 /* 41 * Copy module-related data into the load area, where it can be 42 * used as a directory for loaded modules. 43 * 44 * Module data is presented in a self-describing format. Each datum 45 * is preceded by a 32-bit identifier and a 32-bit size field. 46 * 47 * Currently, the following data are saved: 48 * 49 * MOD_NAME (variable) module name (string) 50 * MOD_TYPE (variable) module type (string) 51 * MOD_ARGS (variable) module parameters (string) 52 * MOD_ADDR sizeof(vm_offset_t) module load address 53 * MOD_SIZE sizeof(size_t) module size 54 * MOD_METADATA (variable) type-specific metadata 55 */ 56 #define COPY32(v, a, c) { \ 57 u_int32_t x = (v); \ 58 if (c) \ 59 i386_copyin(&x, a, sizeof(x)); \ 60 a += sizeof(x); \ 61 } 62 63 #define MOD_STR(t, a, s, c) { \ 64 COPY32(t, a, c); \ 65 COPY32(strlen(s) + 1, a, c); \ 66 if (c) \ 67 i386_copyin(s, a, strlen(s) + 1); \ 68 a += roundup(strlen(s) + 1, sizeof(u_long));\ 69 } 70 71 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c) 72 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c) 73 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c) 74 75 #define MOD_VAR(t, a, s, c) { \ 76 COPY32(t, a, c); \ 77 COPY32(sizeof(s), a, c); \ 78 if (c) \ 79 i386_copyin(&s, a, sizeof(s)); \ 80 a += roundup(sizeof(s), sizeof(u_long)); \ 81 } 82 83 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c) 84 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c) 85 86 #define MOD_METADATA(a, mm, c) { \ 87 COPY32(MODINFO_METADATA | mm->md_type, a, c); \ 88 COPY32(mm->md_size, a, c); \ 89 if (c) \ 90 i386_copyin(mm->md_data, a, mm->md_size); \ 91 a += roundup(mm->md_size, sizeof(u_long));\ 92 } 93 94 #define MOD_END(a, c) { \ 95 COPY32(MODINFO_END, a, c); \ 96 COPY32(0, a, c); \ 97 } 98 99 static vm_offset_t bi_copymodules32(vm_offset_t addr)100 bi_copymodules32(vm_offset_t addr) 101 { 102 struct preloaded_file *fp; 103 struct file_metadata *md; 104 int c; 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 MOD_ADDR(addr, fp->f_addr, c); 115 MOD_SIZE(addr, fp->f_size, c); 116 for (md = fp->f_metadata; md != NULL; md = md->md_next) 117 if (!(md->md_type & MODINFOMD_NOCOPY)) 118 MOD_METADATA(addr, md, c); 119 } 120 MOD_END(addr, c); 121 return(addr); 122 } 123 124 /* 125 * Load the information expected by an i386 kernel. 126 * 127 * - The 'boothowto' argument is constructed 128 * - The 'bootdev' argument is constructed 129 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 130 * - The kernel environment is copied into kernel space. 131 * - Module metadata are formatted and placed in kernel space. 132 */ 133 int bi_load32(char * args,int * howtop,int * bootdevp,vm_offset_t * bip,vm_offset_t * modulep,vm_offset_t * kernendp)134 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp) 135 { 136 struct preloaded_file *xp, *kfp; 137 struct i386_devdesc *rootdev; 138 struct file_metadata *md; 139 vm_offset_t addr; 140 vm_offset_t kernend; 141 vm_offset_t envp; 142 vm_offset_t size; 143 vm_offset_t ssym, esym; 144 char *rootdevname; 145 int bootdevnr, i, howto; 146 char *kernelname; 147 const char *kernelpath; 148 149 howto = bi_getboothowto(args); 150 151 /* 152 * Allow the environment variable 'rootdev' to override the supplied device 153 * This should perhaps go to MI code and/or have $rootdev tested/set by 154 * MI code before launching the kernel. 155 */ 156 rootdevname = getenv("rootdev"); 157 i386_getdev((void **)(&rootdev), rootdevname, NULL); 158 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 159 printf("can't determine root device\n"); 160 return(EINVAL); 161 } 162 163 /* Try reading the /etc/fstab file to select the root device */ 164 getrootmount(i386_fmtdev((void *)rootdev)); 165 166 /* Do legacy rootdev guessing */ 167 168 /* XXX - use a default bootdev of 0. Is this ok??? */ 169 bootdevnr = 0; 170 171 switch(rootdev->dd.d_dev->dv_type) { 172 case DEVT_CD: 173 case DEVT_DISK: 174 /* pass in the BIOS device number of the current disk */ 175 bi.bi_bios_dev = bd_unit2bios(rootdev); 176 bootdevnr = bd_getdev(rootdev); 177 break; 178 179 case DEVT_NET: 180 case DEVT_ZFS: 181 break; 182 183 default: 184 printf("WARNING - don't know how to boot from device type %d\n", 185 rootdev->dd.d_dev->dv_type); 186 } 187 if (bootdevnr == -1) { 188 printf("root device %s invalid\n", i386_fmtdev(rootdev)); 189 return (EINVAL); 190 } 191 free(rootdev); 192 193 /* find the last module in the chain */ 194 addr = 0; 195 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 196 if (addr < (xp->f_addr + xp->f_size)) 197 addr = xp->f_addr + xp->f_size; 198 } 199 /* pad to a page boundary */ 200 addr = roundup(addr, PAGE_SIZE); 201 202 /* copy our environment */ 203 envp = addr; 204 addr = bi_copyenv(addr); 205 206 /* pad to a page boundary */ 207 addr = roundup(addr, PAGE_SIZE); 208 209 kfp = file_findfile(NULL, "elf kernel"); 210 if (kfp == NULL) 211 kfp = file_findfile(NULL, "elf32 kernel"); 212 if (kfp == NULL) 213 panic("can't find kernel file"); 214 kernend = 0; /* fill it in later */ 215 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 216 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 217 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 218 bios_addsmapdata(kfp); 219 220 /* Figure out the size and location of the metadata */ 221 *modulep = addr; 222 size = bi_copymodules32(0); 223 kernend = roundup(addr + size, PAGE_SIZE); 224 *kernendp = kernend; 225 226 /* patch MODINFOMD_KERNEND */ 227 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 228 bcopy(&kernend, md->md_data, sizeof kernend); 229 230 /* copy module list and metadata */ 231 (void)bi_copymodules32(addr); 232 233 ssym = esym = 0; 234 md = file_findmetadata(kfp, MODINFOMD_SSYM); 235 if (md != NULL) 236 bcopy(&md->md_data, &ssym, sizeof (vm_offset_t)); 237 md = file_findmetadata(kfp, MODINFOMD_ESYM); 238 if (md != NULL) 239 bcopy(&md->md_data, &esym, sizeof (vm_offset_t)); 240 if (ssym == 0 || esym == 0) 241 ssym = esym = 0; /* sanity */ 242 243 /* legacy bootinfo structure */ 244 kernelname = getenv("kernelname"); 245 i386_getdev(NULL, kernelname, &kernelpath); 246 bi.bi_version = BOOTINFO_VERSION; 247 bi.bi_kernelname = 0; /* XXX char * -> kernel name */ 248 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ 249 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ 250 for (i = 0; i < N_BIOS_GEOM; i++) 251 bi.bi_bios_geom[i] = bd_getbigeom(i); 252 bi.bi_size = sizeof(bi); 253 bi.bi_memsizes_valid = 1; 254 bi.bi_basemem = bios_basemem / 1024; 255 bi.bi_extmem = bios_extmem / 1024; 256 bi.bi_envp = envp; 257 bi.bi_modulep = *modulep; 258 bi.bi_kernend = kernend; 259 bi.bi_kernelname = VTOP(kernelpath); 260 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 261 bi.bi_esymtab = esym; 262 263 /* legacy boot arguments */ 264 *howtop = howto | RB_BOOTINFO; 265 *bootdevp = bootdevnr; 266 *bip = VTOP(&bi); 267 268 return(0); 269 } 270