sys/boot/efi/libefi/bootinfo.c

   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  * $FreeBSD$
  27  * $DragonFly: src/sys/boot/efi/libefi/bootinfo.c,v 1.1 2003/11/10 06:08:32 dillon Exp $
  28  */
  29
  30 #include <stand.h>
  31 #include <string.h>
  32 #include <sys/param.h>
  33 #include <sys/reboot.h>
  34 #include <sys/linker.h>
  35 #include <machine/elf.h>
  36 #include <machine/bootinfo.h>
  37
  38 #include <efi.h>
  39 #include <efilib.h>
  40
  41 #include "bootstrap.h"
  42
  43 static EFI_GUID hcdp = HCDP_TABLE_GUID;
  44
  45 /*
  46  * Return a 'boothowto' value corresponding to the kernel arguments in
  47  * (kargs) and any relevant environment variables.
  48  */
  49 static struct
  50 {
  51     const char  *ev;
  52     int         mask;
  53 } howto_names[] = {
  54     {"boot_askname",    RB_ASKNAME},
  55     {"boot_cdrom",      RB_CDROM},
  56     {"boot_userconfig", RB_CONFIG},
  57     {"boot_ddb",        RB_KDB},
  58     {"boot_gdb",        RB_GDB},
  59     {"boot_single",     RB_SINGLE},
  60     {"boot_verbose",    RB_VERBOSE},
  61     {"boot_multicons",  RB_MULTIPLE},
  62     {"boot_serial",     RB_SERIAL},
  63     {NULL,      0}
  64 };
  65
  66 extern char *efi_fmtdev(void *vdev);
  67
  68 int
  69 bi_getboothowto(char *kargs)
  70 {
  71     char        *cp;
  72     int         howto;
  73     int         active;
  74     int         i;
  75
  76     /* Parse kargs */
  77     howto = 0;
  78     if (kargs  != NULL) {
  79         cp = kargs;
  80         active = 0;
  81         while (*cp != 0) {
  82             if (!active && (*cp == '-')) {
  83                 active = 1;
  84             } else if (active)
  85                 switch (*cp) {
  86                 case 'a':
  87                     howto |= RB_ASKNAME;
  88                     break;
  89                 case 'c':
  90                     howto |= RB_CONFIG;
  91                     break;
  92                 case 'C':
  93                     howto |= RB_CDROM;
  94                     break;
  95                 case 'd':
  96                     howto |= RB_KDB;
  97                     break;
  98                 case 'D':
  99                     howto |= RB_MULTIPLE;
 100                     break;
 101                 case 'm':
 102                     howto |= RB_MUTE;
 103                     break;
 104                 case 'g':
 105                     howto |= RB_GDB;
 106                     break;
 107                 case 'h':
 108                     howto |= RB_SERIAL;
 109                     break;
 110                 case 'r':
 111                     howto |= RB_DFLTROOT;
 112                     break;
 113                 case 's':
 114                     howto |= RB_SINGLE;
 115                     break;
 116                 case 'v':
 117                     howto |= RB_VERBOSE;
 118                     break;
 119                 default:
 120                     active = 0;
 121                     break;
 122                 }
 123             cp++;
 124         }
 125     }
 126     /* get equivalents from the environment */
 127     for (i = 0; howto_names[i].ev != NULL; i++)
 128         if (getenv(howto_names[i].ev) != NULL)
 129             howto |= howto_names[i].mask;
 130     if (!strcmp(getenv("console"), "comconsole"))
 131         howto |= RB_SERIAL;
 132     if (!strcmp(getenv("console"), "nullconsole"))
 133         howto |= RB_MUTE;
 134     return(howto);
 135 }
 136
 137 /*
 138  * Copy the environment into the load area starting at (addr).
 139  * Each variable is formatted as <name>=<value>, with a single nul
 140  * separating each variable, and a double nul terminating the environment.
 141  */
 142 vm_offset_t
 143 bi_copyenv(vm_offset_t addr)
 144 {
 145     struct env_var      *ep;
 146
 147     /* traverse the environment */
 148     for (ep = environ; ep != NULL; ep = ep->ev_next) {
 149         efi_copyin(ep->ev_name, addr, strlen(ep->ev_name));
 150         addr += strlen(ep->ev_name);
 151         efi_copyin("=", addr, 1);
 152         addr++;
 153         if (ep->ev_value != NULL) {
 154             efi_copyin(ep->ev_value, addr, strlen(ep->ev_value));
 155             addr += strlen(ep->ev_value);
 156         }
 157         efi_copyin("", addr, 1);
 158         addr++;
 159     }
 160     efi_copyin("", addr, 1);
 161     addr++;
 162     return(addr);
 163 }
 164
 165 /*
 166  * Copy module-related data into the load area, where it can be
 167  * used as a directory for loaded modules.
 168  *
 169  * Module data is presented in a self-describing format.  Each datum
 170  * is preceded by a 32-bit identifier and a 32-bit size field.
 171  *
 172  * Currently, the following data are saved:
 173  *
 174  * MOD_NAME     (variable)              module name (string)
 175  * MOD_TYPE     (variable)              module type (string)
 176  * MOD_ARGS     (variable)              module parameters (string)
 177  * MOD_ADDR     sizeof(vm_offset_t)     module load address
 178  * MOD_SIZE     sizeof(size_t)          module size
 179  * MOD_METADATA (variable)              type-specific metadata
 180  */
 181 #define COPY32(v, a) {                          \
 182     u_int32_t   x = (v);                        \
 183     efi_copyin(&x, a, sizeof(x));               \
 184     a += sizeof(x);                             \
 185 }
 186
 187 #define MOD_STR(t, a, s) {                      \
 188     COPY32(t, a);                               \
 189     COPY32(strlen(s) + 1, a);                   \
 190     efi_copyin(s, a, strlen(s) + 1);            \
 191     a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
 192 }
 193
 194 #define MOD_NAME(a, s)  MOD_STR(MODINFO_NAME, a, s)
 195 #define MOD_TYPE(a, s)  MOD_STR(MODINFO_TYPE, a, s)
 196 #define MOD_ARGS(a, s)  MOD_STR(MODINFO_ARGS, a, s)
 197
 198 #define MOD_VAR(t, a, s) {                      \
 199     COPY32(t, a);                               \
 200     COPY32(sizeof(s), a);                       \
 201     efi_copyin(&s, a, sizeof(s));               \
 202     a += roundup(sizeof(s), sizeof(u_int64_t)); \
 203 }
 204
 205 #define MOD_ADDR(a, s)  MOD_VAR(MODINFO_ADDR, a, s)
 206 #define MOD_SIZE(a, s)  MOD_VAR(MODINFO_SIZE, a, s)
 207
 208 #define MOD_METADATA(a, mm) {                   \
 209     COPY32(MODINFO_METADATA | mm->md_type, a);  \
 210     COPY32(mm->md_size, a);                     \
 211     efi_copyin(mm->md_data, a, mm->md_size);    \
 212     a += roundup(mm->md_size, sizeof(u_int64_t));\
 213 }
 214
 215 #define MOD_END(a) {                            \
 216     COPY32(MODINFO_END, a);                     \
 217     COPY32(0, a);                               \
 218 }
 219
 220 vm_offset_t
 221 bi_copymodules(vm_offset_t addr)
 222 {
 223     struct preloaded_file       *fp;
 224     struct file_metadata        *md;
 225
 226     /* start with the first module on the list, should be the kernel */
 227     for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
 228
 229         MOD_NAME(addr, fp->f_name);     /* this field must come first */
 230         MOD_TYPE(addr, fp->f_type);
 231         if (fp->f_args)
 232             MOD_ARGS(addr, fp->f_args);
 233         MOD_ADDR(addr, fp->f_addr);
 234         MOD_SIZE(addr, fp->f_size);
 235         for (md = fp->f_metadata; md != NULL; md = md->md_next)
 236             if (!(md->md_type & MODINFOMD_NOCOPY))
 237                 MOD_METADATA(addr, md);
 238     }
 239     MOD_END(addr);
 240     return(addr);
 241 }
 242
 243 /*
 244  * Load the information expected by an alpha kernel.
 245  *
 246  * - The kernel environment is copied into kernel space.
 247  * - Module metadata are formatted and placed in kernel space.
 248  */
 249 int
 250 bi_load(struct bootinfo *bi, struct preloaded_file *fp, UINTN *mapkey,
 251     UINTN pages)
 252 {
 253     char                        *rootdevname;
 254     struct efi_devdesc          *rootdev;
 255     struct preloaded_file       *xp;
 256     vm_offset_t                 addr, bootinfo_addr;
 257     vm_offset_t                 ssym, esym;
 258     struct file_metadata        *md;
 259     EFI_STATUS                  status;
 260     UINTN                       bisz, key;
 261
 262     /*
 263      * Version 1 bootinfo.
 264      */
 265     bi->bi_magic = BOOTINFO_MAGIC;
 266     bi->bi_version = 1;
 267
 268     /*
 269      * Calculate boothowto.
 270      */
 271     bi->bi_boothowto = bi_getboothowto(fp->f_args);
 272
 273     /*
 274      * Stash EFI System Table.
 275      */
 276     bi->bi_systab = (u_int64_t) ST;
 277
 278     /*
 279      * Allow the environment variable 'rootdev' to override the supplied
 280      * device. This should perhaps go to MI code and/or have $rootdev
 281      * tested/set by MI code before launching the kernel.
 282      */
 283     rootdevname = getenv("rootdev");
 284     efi_getdev((void **)(&rootdev), rootdevname, NULL);
 285     if (rootdev == NULL) {              /* bad $rootdev/$currdev */
 286         printf("can't determine root device\n");
 287         return(EINVAL);
 288     }
 289
 290     /* Try reading the /etc/fstab file to select the root device */
 291     getrootmount(efi_fmtdev((void *)rootdev));
 292     free(rootdev);
 293
 294     ssym = esym = 0;
 295     if ((md = file_findmetadata(fp, MODINFOMD_SSYM)) != NULL)
 296         ssym = *((vm_offset_t *)&(md->md_data));
 297     if ((md = file_findmetadata(fp, MODINFOMD_ESYM)) != NULL)
 298         esym = *((vm_offset_t *)&(md->md_data));
 299     if (ssym == 0 || esym == 0)
 300         ssym = esym = 0;                /* sanity */
 301
 302     bi->bi_symtab = ssym;
 303     bi->bi_esymtab = esym;
 304
 305     bi->bi_hcdp = (uint64_t)efi_get_table(&hcdp); /* DIG64 HCDP table addr. */
 306     fpswa_init(&bi->bi_fpswa);          /* find FPSWA interface */
 307
 308     /* find the last module in the chain */
 309     addr = 0;
 310     for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
 311         if (addr < (xp->f_addr + xp->f_size))
 312             addr = xp->f_addr + xp->f_size;
 313     }
 314
 315     /* pad to a page boundary */
 316     addr = (addr + PAGE_MASK) & ~PAGE_MASK;
 317
 318     /* copy our environment */
 319     bi->bi_envp = addr;
 320     addr = bi_copyenv(addr);
 321
 322     /* pad to a page boundary */
 323     addr = (addr + PAGE_MASK) & ~PAGE_MASK;
 324
 325     /* copy module list and metadata */
 326     bi->bi_modulep = addr;
 327     addr = bi_copymodules(addr);
 328
 329     /* all done copying stuff in, save end of loaded object space */
 330     bi->bi_kernend = addr;
 331
 332     /*
 333      * Read the memory map and stash it after bootinfo. Align the memory map
 334      * on a 16-byte boundary (the bootinfo block is page aligned).
 335      */
 336     bisz = (sizeof(struct bootinfo) + 0x0f) & ~0x0f;
 337     bi->bi_memmap = ((u_int64_t)bi) + bisz;
 338     bi->bi_memmap_size = EFI_PAGE_SIZE * pages - bisz;
 339     status = BS->GetMemoryMap(&bi->bi_memmap_size,
 340                 (EFI_MEMORY_DESCRIPTOR *)bi->bi_memmap, &key,
 341                 &bi->bi_memdesc_size, &bi->bi_memdesc_version);
 342     if (EFI_ERROR(status)) {
 343         printf("bi_load: Can't read memory map\n");
 344         return EINVAL;
 345     }
 346     *mapkey = key;
 347
 348     return(0);
 349 }