usr/src/boot/sys/boot/i386/libi386/bootinfo32.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
  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
 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
 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             /* Pass in BIOS device number. */
 174             bi.bi_bios_dev = bc_unit2bios(rootdev->dd.d_unit);
 175             bootdevnr = bc_getdev(rootdev);
 176             break;
 177
 178     case DEVT_DISK:
 179         /* pass in the BIOS device number of the current disk */
 180         bi.bi_bios_dev = bd_unit2bios(rootdev->dd.d_unit);
 181         bootdevnr = bd_getdev(rootdev);
 182         break;
 183
 184     case DEVT_NET:
 185     case DEVT_ZFS:
 186             break;
 187
 188     default:
 189         printf("WARNING - don't know how to boot from device type %d\n",
 190             rootdev->dd.d_dev->dv_type);
 191     }
 192     if (bootdevnr == -1) {
 193         printf("root device %s invalid\n", i386_fmtdev(rootdev));
 194         return (EINVAL);
 195     }
 196     free(rootdev);
 197
 198     /* find the last module in the chain */
 199     addr = 0;
 200     for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
 201         if (addr < (xp->f_addr + xp->f_size))
 202             addr = xp->f_addr + xp->f_size;
 203     }
 204     /* pad to a page boundary */
 205     addr = roundup(addr, PAGE_SIZE);
 206
 207     /* copy our environment */
 208     envp = addr;
 209     addr = bi_copyenv(addr);
 210
 211     /* pad to a page boundary */
 212     addr = roundup(addr, PAGE_SIZE);
 213
 214     kfp = file_findfile(NULL, "elf kernel");
 215     if (kfp == NULL)
 216       kfp = file_findfile(NULL, "elf32 kernel");
 217     if (kfp == NULL)
 218         panic("can't find kernel file");
 219     kernend = 0;        /* fill it in later */
 220     file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
 221     file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
 222     file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
 223     bios_addsmapdata(kfp);
 224
 225     /* Figure out the size and location of the metadata */
 226     *modulep = addr;
 227     size = bi_copymodules32(0);
 228     kernend = roundup(addr + size, PAGE_SIZE);
 229     *kernendp = kernend;
 230
 231     /* patch MODINFOMD_KERNEND */
 232     md = file_findmetadata(kfp, MODINFOMD_KERNEND);
 233     bcopy(&kernend, md->md_data, sizeof kernend);
 234
 235     /* copy module list and metadata */
 236     (void)bi_copymodules32(addr);
 237
 238     ssym = esym = 0;
 239     md = file_findmetadata(kfp, MODINFOMD_SSYM);
 240     if (md != NULL)
 241         ssym = *((vm_offset_t *)&(md->md_data));
 242     md = file_findmetadata(kfp, MODINFOMD_ESYM);
 243     if (md != NULL)
 244         esym = *((vm_offset_t *)&(md->md_data));
 245     if (ssym == 0 || esym == 0)
 246         ssym = esym = 0;                /* sanity */
 247
 248     /* legacy bootinfo structure */
 249     kernelname = getenv("kernelname");
 250     i386_getdev(NULL, kernelname, &kernelpath);
 251     bi.bi_version = BOOTINFO_VERSION;
 252     bi.bi_kernelname = 0;               /* XXX char * -> kernel name */
 253     bi.bi_nfs_diskless = 0;             /* struct nfs_diskless * */
 254     bi.bi_n_bios_used = 0;              /* XXX would have to hook biosdisk driver for these */
 255     for (i = 0; i < N_BIOS_GEOM; i++)
 256         bi.bi_bios_geom[i] = bd_getbigeom(i);
 257     bi.bi_size = sizeof(bi);
 258     bi.bi_memsizes_valid = 1;
 259     bi.bi_basemem = bios_basemem / 1024;
 260     bi.bi_extmem = bios_extmem / 1024;
 261     bi.bi_envp = envp;
 262     bi.bi_modulep = *modulep;
 263     bi.bi_kernend = kernend;
 264     bi.bi_kernelname = VTOP(kernelpath);
 265     bi.bi_symtab = ssym;       /* XXX this is only the primary kernel symtab */
 266     bi.bi_esymtab = esym;
 267
 268     /* legacy boot arguments */
 269     *howtop = howto | RB_BOOTINFO;
 270     *bootdevp = bootdevnr;
 271     *bip = VTOP(&bi);
 272
 273     return(0);
 274 }