1 /* $NetBSD: bootinfo.c,v 1.3 2009/07/20 04:59:04 kiyohara Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 /* __FBSDID("$FreeBSD: src/sys/boot/ia64/libski/bootinfo.c,v 1.9 2003/09/08 09:11:32 obrien Exp $"); */ 31 32 #include <lib/libsa/stand.h> 33 #include <lib/libsa/loadfile.h> 34 35 #include <sys/param.h> 36 #include <sys/reboot.h> 37 #include <sys/boot_flag.h> 38 #include <sys/exec_elf.h> 39 #include <sys/lock.h> 40 41 #include <machine/vmparam.h> 42 #include <machine/elf_machdep.h> 43 #include <machine/bootinfo.h> 44 45 46 #include "bootstrap.h" 47 48 /* 49 * Return a 'boothowto' value corresponding to the kernel arguments in 50 * (kargs) and any relevant environment variables. 51 */ 52 static struct 53 { 54 const char *ev; 55 int mask; 56 } howto_names[] = { 57 {"boot_askname", RB_ASKNAME}, 58 {"boot_single", RB_SINGLE}, 59 {"boot_nosync", RB_NOSYNC}, 60 {"boot_halt", RB_HALT}, 61 {"boot_kdb", RB_KDB}, 62 {"boot_rdonly", RB_RDONLY}, 63 {"boot_dump", RB_DUMP}, 64 {"boot_miniroot", RB_MINIROOT}, 65 {"boot_userconf", RB_USERCONF}, 66 {NULL, 0} 67 }; 68 69 vaddr_t ia64_unwindtab = 0; /* This is set by the libsa/loadfile_elf32.c MD_LOADSEG callback */ 70 vsize_t ia64_unwindtablen = 0; 71 72 73 extern char *ski_fmtdev(void *vdev); 74 extern int ski_init_stubs(struct bootinfo *); 75 76 int 77 bi_getboothowto(char *kargs) 78 { 79 char *cp; 80 int howto; 81 int active; 82 int i; 83 84 /* Parse kargs */ 85 howto = 0; 86 if (kargs != NULL) { 87 cp = kargs; 88 active = 0; 89 while (*cp != 0) { 90 if (!active && (*cp == '-')) { 91 active = 1; 92 } else if (active) 93 94 BOOT_FLAG(*cp, howto); 95 96 cp++; 97 } 98 } 99 /* get equivalents from the environment */ 100 for (i = 0; howto_names[i].ev != NULL; i++) 101 if (getenv(howto_names[i].ev) != NULL) 102 howto |= howto_names[i].mask; 103 return(howto); 104 } 105 106 107 /* 108 * Copy the environment into the load area starting at (addr). 109 * Each variable is formatted as <name>=<value>, with a single nul 110 * separating each variable, and a double nul terminating the environment. 111 */ 112 vaddr_t 113 bi_copyenv(vaddr_t addr) 114 { 115 struct env_var *ep; 116 117 /* traverse the environment */ 118 for (ep = environ; ep != NULL; ep = ep->ev_next) { 119 ski_copyin(ep->ev_name, addr, strlen(ep->ev_name)); 120 addr += strlen(ep->ev_name); 121 ski_copyin("=", addr, 1); 122 addr++; 123 if (ep->ev_value != NULL) { 124 ski_copyin(ep->ev_value, addr, strlen(ep->ev_value)); 125 addr += strlen(ep->ev_value); 126 } 127 ski_copyin("", addr, 1); 128 addr++; 129 } 130 ski_copyin("", addr, 1); 131 addr++; 132 return(addr); 133 } 134 135 /* 136 * Copy module-related data into the load area, where it can be 137 * used as a directory for loaded modules. 138 * 139 * Module data is presented in a self-describing format. Each datum 140 * is preceded by a 32-bit identifier and a 32-bit size field. 141 * 142 * Currently, the following data are saved: 143 * 144 * MOD_NAME (variable) module name (string) 145 * MOD_TYPE (variable) module type (string) 146 * MOD_ARGS (variable) module parameters (string) 147 * MOD_ADDR sizeof(vm_offset_t) module load address 148 * MOD_SIZE sizeof(size_t) module size 149 * MOD_METADATA (variable) type-specific metadata 150 */ 151 #define COPY32(v, a) { \ 152 u_int32_t x = (v); \ 153 ski_copyin(&x, a, sizeof(x)); \ 154 a += sizeof(x); \ 155 } 156 157 #define MOD_STR(t, a, s) { \ 158 COPY32(t, a); \ 159 COPY32(strlen(s) + 1, a); \ 160 ski_copyin(s, a, strlen(s) + 1); \ 161 a += roundup(strlen(s) + 1, sizeof(u_int64_t));\ 162 } 163 164 #define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s) 165 #define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s) 166 #define MOD_ARGS(a, s) MOD_STR(MODINFO_ARGS, a, s) 167 168 #define MOD_VAR(t, a, s) { \ 169 COPY32(t, a); \ 170 COPY32(sizeof(s), a); \ 171 ski_copyin(&s, a, sizeof(s)); \ 172 a += roundup(sizeof(s), sizeof(u_int64_t)); \ 173 } 174 175 #define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s) 176 #define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s) 177 178 #define MOD_METADATA(a, mm) { \ 179 COPY32(MODINFO_METADATA | mm->md_type, a); \ 180 COPY32(mm->md_size, a); \ 181 ski_copyin(mm->md_data, a, mm->md_size); \ 182 a += roundup(mm->md_size, sizeof(u_int64_t));\ 183 } 184 185 #define MOD_END(a) { \ 186 COPY32(MODINFO_END, a); \ 187 COPY32(0, a); \ 188 } 189 190 /* 191 * Load the information expected by an ia64 kernel. 192 * 193 * - The kernel environment is copied into kernel space. 194 * - Module metadata are formatted and placed in kernel space. 195 */ 196 int 197 bi_load(struct bootinfo *bi, struct preloaded_file *fp, char *args) 198 { 199 char *rootdevname; 200 struct ski_devdesc *rootdev; 201 struct preloaded_file *xp; 202 vaddr_t addr, bootinfo_addr; 203 char *kernelname; 204 vaddr_t ssym, esym; 205 struct file_metadata *md; 206 207 /* 208 * Version 1 bootinfo. 209 */ 210 bi->bi_magic = BOOTINFO_MAGIC; 211 bi->bi_version = 1; 212 213 /* 214 * Calculate boothowto. 215 */ 216 bi->bi_boothowto = bi_getboothowto(fp->f_args); 217 218 /* 219 * Allow the environment variable 'rootdev' to override the supplied device 220 * This should perhaps go to MI code and/or have $rootdev tested/set by 221 * MI code before launching the kernel. 222 */ 223 rootdevname = getenv("rootdev"); 224 ski_getdev((void **)(&rootdev), rootdevname, NULL); 225 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 226 printf("can't determine root device\n"); 227 return(EINVAL); 228 } 229 230 /* Try reading the /etc/fstab file to select the root device */ 231 getrootmount(ski_fmtdev((void *)rootdev)); 232 free(rootdev); 233 234 ssym = esym = 0; 235 236 ssym = fp->marks[MARK_SYM]; 237 esym = fp->marks[MARK_END]; 238 239 if (ssym == 0 || esym == 0) 240 ssym = esym = 0; /* sanity */ 241 242 bi->bi_symtab = ssym; 243 bi->bi_esymtab = esym; 244 245 /* find the last module in the chain */ 246 addr = 0; 247 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 248 if (addr < (xp->f_addr + xp->f_size)) 249 addr = xp->f_addr + xp->f_size; 250 } 251 252 /* pad to a page boundary */ 253 addr = (addr + PAGE_MASK) & ~PAGE_MASK; 254 255 /* copy our environment */ 256 bi->bi_envp = addr; 257 addr = bi_copyenv(addr); 258 259 /* copy the unwind table pointer */ 260 if((bi->bi_unwindtab = (uint64_t) ia64_unwindtab) == 0) 261 printf("Warning: ia64 unwind sections not found. \n" 262 "See: include/loadfile_machdep.h \n"); 263 264 if((bi->bi_unwindtablen = (uint64_t) ia64_unwindtablen) == 0) 265 printf("Warning: ia64 unwind section length is zero. \n " 266 "See: include/loadfile_machdep.h \n"); 267 268 /* pad to a page boundary */ 269 addr = (addr + PAGE_MASK) & ~PAGE_MASK; 270 271 /* all done copying stuff in, save end of loaded object space */ 272 bi->bi_kernend = addr; 273 274 return (ski_init_stubs(bi)); 275 } 276