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 <i386/include/bootinfo.h> 35 36 #include "bootstrap.h" 37 #include "libuserboot.h" 38 39 static 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 CALLBACK(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 CALLBACK(copyin, s, a, strlen(s) + 1); \ 69 a += roundup(strlen(s) + 1, sizeof(uint32_t));\ 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 CALLBACK(copyin, &s, a, sizeof(s)); \ 81 a += roundup(sizeof(s), sizeof(uint32_t)); \ 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 CALLBACK(copyin, mm->md_data, a, mm->md_size); \ 92 a += roundup(mm->md_size, sizeof(uint32_t));\ 93 } 94 95 #define MOD_END(a, c) { \ 96 COPY32(MODINFO_END, a, c); \ 97 COPY32(0, a, c); \ 98 } 99 100 static vm_offset_t 101 bi_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 */ 134 int 135 bi_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, howto; 147 char *kernelname; 148 const char *kernelpath; 149 uint64_t lowmem, highmem; 150 151 howto = bi_getboothowto(args); 152 153 /* 154 * Allow the environment variable 'rootdev' to override the supplied device 155 * This should perhaps go to MI code and/or have $rootdev tested/set by 156 * MI code before launching the kernel. 157 */ 158 rootdevname = getenv("rootdev"); 159 userboot_getdev((void **)(&rootdev), rootdevname, NULL); 160 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 161 printf("can't determine root device\n"); 162 return(EINVAL); 163 } 164 165 /* Try reading the /etc/fstab file to select the root device */ 166 getrootmount(userboot_fmtdev((void *)rootdev)); 167 168 bootdevnr = 0; 169 #if 0 170 if (bootdevnr == -1) { 171 printf("root device %s invalid\n", i386_fmtdev(rootdev)); 172 return (EINVAL); 173 } 174 #endif 175 free(rootdev); 176 177 /* find the last module in the chain */ 178 addr = 0; 179 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 180 if (addr < (xp->f_addr + xp->f_size)) 181 addr = xp->f_addr + xp->f_size; 182 } 183 /* pad to a page boundary */ 184 addr = roundup(addr, PAGE_SIZE); 185 186 /* copy our environment */ 187 envp = addr; 188 addr = bi_copyenv(addr); 189 190 /* pad to a page boundary */ 191 addr = roundup(addr, PAGE_SIZE); 192 193 kfp = file_findfile(NULL, "elf kernel"); 194 if (kfp == NULL) 195 kfp = file_findfile(NULL, "elf32 kernel"); 196 if (kfp == NULL) 197 panic("can't find kernel file"); 198 kernend = 0; /* fill it in later */ 199 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto); 200 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp); 201 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend); 202 bios_addsmapdata(kfp); 203 204 /* Figure out the size and location of the metadata */ 205 *modulep = addr; 206 size = bi_copymodules32(0); 207 kernend = roundup(addr + size, PAGE_SIZE); 208 *kernendp = kernend; 209 210 /* patch MODINFOMD_KERNEND */ 211 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 212 bcopy(&kernend, md->md_data, sizeof kernend); 213 214 /* copy module list and metadata */ 215 (void)bi_copymodules32(addr); 216 217 ssym = esym = 0; 218 md = file_findmetadata(kfp, MODINFOMD_SSYM); 219 if (md != NULL) 220 ssym = *((vm_offset_t *)&(md->md_data)); 221 md = file_findmetadata(kfp, MODINFOMD_ESYM); 222 if (md != NULL) 223 esym = *((vm_offset_t *)&(md->md_data)); 224 if (ssym == 0 || esym == 0) 225 ssym = esym = 0; /* sanity */ 226 227 /* legacy bootinfo structure */ 228 kernelname = getenv("kernelname"); 229 userboot_getdev(NULL, kernelname, &kernelpath); 230 bi.bi_version = BOOTINFO_VERSION; 231 bi.bi_kernelname = 0; /* XXX char * -> kernel name */ 232 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ 233 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ 234 #if 0 235 for (i = 0; i < N_BIOS_GEOM; i++) 236 bi.bi_bios_geom[i] = bd_getbigeom(i); 237 #endif 238 bi.bi_size = sizeof(bi); 239 CALLBACK(getmem, &lowmem, &highmem); 240 bi.bi_memsizes_valid = 1; 241 bi.bi_basemem = 640; 242 bi.bi_extmem = (lowmem - 0x100000) / 1024; 243 bi.bi_envp = envp; 244 bi.bi_modulep = *modulep; 245 bi.bi_kernend = kernend; 246 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */ 247 bi.bi_esymtab = esym; 248 249 /* 250 * Copy the legacy bootinfo and kernel name to the guest at 0x2000 251 */ 252 bi.bi_kernelname = 0x2000 + sizeof(bi); 253 CALLBACK(copyin, &bi, 0x2000, sizeof(bi)); 254 CALLBACK(copyin, kernelname, 0x2000 + sizeof(bi), strlen(kernelname) + 1); 255 256 /* legacy boot arguments */ 257 *howtop = howto | RB_BOOTINFO; 258 *bootdevp = bootdevnr; 259 *bip = 0x2000; 260 261 return(0); 262 } 263