sys/boot/pc32/libi386/bootinfo64.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: src/sys/boot/i386/libi386/bootinfo64.c,v 1.36 2003/08/25 23:28:31 obrien Exp $
  27  * $DragonFly: src/sys/boot/pc32/libi386/bootinfo64.c,v 1.1 2003/11/10 06:08:36 dillon Exp $
  28  */
  29
  30 #include <stand.h>
  31 #include <sys/param.h>
  32 #include <sys/reboot.h>
  33 #include <sys/linker.h>
  34 #include <machine/bootinfo.h>
  35 #include "bootstrap.h"
  36 #include "libi386.h"
  37 #include "btxv86.h"
  38
  39 /*
  40  * Copy module-related data into the load area, where it can be
  41  * used as a directory for loaded modules.
  42  *
  43  * Module data is presented in a self-describing format.  Each datum
  44  * is preceded by a 32-bit identifier and a 32-bit size field.
  45  *
  46  * Currently, the following data are saved:
  47  *
  48  * MOD_NAME     (variable)              module name (string)
  49  * MOD_TYPE     (variable)              module type (string)
  50  * MOD_ARGS     (variable)              module parameters (string)
  51  * MOD_ADDR     sizeof(vm_offset_t)     module load address
  52  * MOD_SIZE     sizeof(size_t)          module size
  53  * MOD_METADATA (variable)              type-specific metadata
  54  */
  55 #define COPY32(v, a, c) {                       \
  56     u_int32_t   x = (v);                        \
  57     if (c)                                      \
  58         i386_copyin(&x, a, sizeof(x));          \
  59     a += sizeof(x);                             \
  60 }
  61
  62 #define MOD_STR(t, a, s, c) {                   \
  63     COPY32(t, a, c);                            \
  64     COPY32(strlen(s) + 1, a, c);                \
  65     if (c)                                      \
  66         i386_copyin(s, a, strlen(s) + 1);       \
  67     a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
  68 }
  69
  70 #define MOD_NAME(a, s, c)       MOD_STR(MODINFO_NAME, a, s, c)
  71 #define MOD_TYPE(a, s, c)       MOD_STR(MODINFO_TYPE, a, s, c)
  72 #define MOD_ARGS(a, s, c)       MOD_STR(MODINFO_ARGS, a, s, c)
  73
  74 #define MOD_VAR(t, a, s, c) {                   \
  75     COPY32(t, a, c);                            \
  76     COPY32(sizeof(s), a, c);                    \
  77     if (c)                                      \
  78         i386_copyin(&s, a, sizeof(s));          \
  79     a += roundup(sizeof(s), sizeof(u_int64_t)); \
  80 }
  81
  82 #define MOD_ADDR(a, s, c)       MOD_VAR(MODINFO_ADDR, a, s, c)
  83 #define MOD_SIZE(a, s, c)       MOD_VAR(MODINFO_SIZE, a, s, c)
  84
  85 #define MOD_METADATA(a, mm, c) {                \
  86     COPY32(MODINFO_METADATA | mm->md_type, a, c); \
  87     COPY32(mm->md_size, a, c);                  \
  88     if (c)                                      \
  89         i386_copyin(mm->md_data, a, mm->md_size); \
  90     a += roundup(mm->md_size, sizeof(u_int64_t));\
  91 }
  92
  93 #define MOD_END(a, c) {                         \
  94     COPY32(MODINFO_END, a, c);                  \
  95     COPY32(0, a, c);                            \
  96 }
  97
  98 static vm_offset_t
  99 bi_copymodules64(vm_offset_t addr)
 100 {
 101     struct preloaded_file       *fp;
 102     struct file_metadata        *md;
 103     int                         c;
 104     u_int64_t                   v;
 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         v = fp->f_addr;
 115         MOD_ADDR(addr, v, c);
 116         v = fp->f_size;
 117         MOD_SIZE(addr, v, c);
 118         for (md = fp->f_metadata; md != NULL; md = md->md_next)
 119             if (!(md->md_type & MODINFOMD_NOCOPY))
 120                 MOD_METADATA(addr, md, c);
 121     }
 122     MOD_END(addr, c);
 123     return(addr);
 124 }
 125
 126 /*
 127  * Load the information expected by an i386 kernel.
 128  *
 129  * - The 'boothowto' argument is constructed
 130  * - The 'bootdev' argument is constructed
 131  * - The 'bootinfo' struct is constructed, and copied into the kernel space.
 132  * - The kernel environment is copied into kernel space.
 133  * - Module metadata are formatted and placed in kernel space.
 134  */
 135 int
 136 bi_load64(char *args, vm_offset_t *modulep, vm_offset_t *kernendp)
 137 {
 138     struct preloaded_file       *xp, *kfp;
 139     struct i386_devdesc         *rootdev;
 140     struct file_metadata        *md;
 141     vm_offset_t                 addr;
 142     u_int64_t                   kernend;
 143     u_int64_t                   envp;
 144     vm_offset_t                 size;
 145     char                        *rootdevname;
 146     int                         i, howto;
 147     char                        *kernelname;
 148     const char                  *kernelpath;
 149
 150     howto = bi_getboothowto(args);
 151
 152     /*
 153      * Allow the environment variable 'rootdev' to override the supplied device
 154      * This should perhaps go to MI code and/or have $rootdev tested/set by
 155      * MI code before launching the kernel.
 156      */
 157     rootdevname = getenv("rootdev");
 158     i386_getdev((void **)(&rootdev), rootdevname, NULL);
 159     if (rootdev == NULL) {              /* bad $rootdev/$currdev */
 160         printf("can't determine root device\n");
 161         return(EINVAL);
 162     }
 163
 164     /* Try reading the /etc/fstab file to select the root device */
 165     getrootmount(i386_fmtdev((void *)rootdev));
 166
 167     /* find the last module in the chain */
 168     addr = 0;
 169     for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
 170         if (addr < (xp->f_addr + xp->f_size))
 171             addr = xp->f_addr + xp->f_size;
 172     }
 173     /* pad to a page boundary */
 174     addr = roundup(addr, PAGE_SIZE);
 175
 176     /* copy our environment */
 177     envp = addr;
 178     addr = bi_copyenv(addr);
 179
 180     /* pad to a page boundary */
 181     addr = roundup(addr, PAGE_SIZE);
 182
 183     kfp = file_findfile(NULL, "elf kernel");
 184     if (kfp == NULL)
 185       kfp = file_findfile(NULL, "elf64 kernel");
 186     if (kfp == NULL)
 187         panic("can't find kernel file");
 188     kernend = 0;        /* fill it in later */
 189     file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
 190     file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
 191     file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
 192     bios_addsmapdata(kfp);
 193
 194     /* Figure out the size and location of the metadata */
 195     *modulep = addr;
 196     size = bi_copymodules64(0);
 197     kernend = roundup(addr + size, PAGE_SIZE);
 198     *kernendp = kernend;
 199
 200     /* patch MODINFOMD_KERNEND */
 201     md = file_findmetadata(kfp, MODINFOMD_KERNEND);
 202     bcopy(&kernend, md->md_data, sizeof kernend);
 203
 204     /* copy module list and metadata */
 205     (void)bi_copymodules64(addr);
 206
 207     return(0);
 208 }