sys/boot/i386/libi386/biossmap.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 __FBSDID("$FreeBSD$");
  29
  30 /*
  31  * Obtain memory configuration information from the BIOS
  32  */
  33 #include <stand.h>
  34 #include <sys/param.h>
  35 #include <sys/linker.h>
  36 #include <sys/queue.h>
  37 #include <sys/stddef.h>
  38 #include <machine/metadata.h>
  39 #include <machine/pc/bios.h>
  40 #include "bootstrap.h"
  41 #include "libi386.h"
  42 #include "btxv86.h"
  43
  44 struct smap_buf {
  45         struct bios_smap        smap;
  46         uint32_t                xattr;  /* Extended attribute from ACPI 3.0 */
  47         STAILQ_ENTRY(smap_buf)  bufs;
  48 };
  49
  50 #define SMAP_BUFSIZE            offsetof(struct smap_buf, bufs)
  51
  52 static struct bios_smap         *smapbase;
  53 static uint32_t                 *smapattr;
  54 static u_int                    smaplen;
  55
  56 void
  57 bios_getsmap(void)
  58 {
  59         struct smap_buf         buf;
  60         STAILQ_HEAD(smap_head, smap_buf) head =
  61             STAILQ_HEAD_INITIALIZER(head);
  62         struct smap_buf         *cur, *next;
  63         u_int                   n, x;
  64
  65         STAILQ_INIT(&head);
  66         n = 0;
  67         x = 0;
  68         v86.ebx = 0;
  69         do {
  70                 v86.ctl = V86_FLAGS;
  71                 v86.addr = 0x15;
  72                 v86.eax = 0xe820;       /* int 0x15 function 0xe820 */
  73                 v86.ecx = SMAP_BUFSIZE;
  74                 v86.edx = SMAP_SIG;
  75                 v86.es = VTOPSEG(&buf);
  76                 v86.edi = VTOPOFF(&buf);
  77                 v86int();
  78                 if (V86_CY(v86.efl) || v86.eax != SMAP_SIG ||
  79                     v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE)
  80                         break;
  81
  82                 next = malloc(sizeof(*next));
  83                 if (next == NULL)
  84                         break;
  85                 next->smap = buf.smap;
  86                 if (v86.ecx == SMAP_BUFSIZE) {
  87                         next->xattr = buf.xattr;
  88                         x++;
  89                 }
  90                 STAILQ_INSERT_TAIL(&head, next, bufs);
  91                 n++;
  92         } while (v86.ebx != 0);
  93         smaplen = n;
  94
  95         if (smaplen > 0) {
  96                 smapbase = malloc(smaplen * sizeof(*smapbase));
  97                 if (smapbase != NULL) {
  98                         n = 0;
  99                         STAILQ_FOREACH(cur, &head, bufs)
 100                                 smapbase[n++] = cur->smap;
 101                 }
 102                 if (smaplen == x) {
 103                         smapattr = malloc(smaplen * sizeof(*smapattr));
 104                         if (smapattr != NULL) {
 105                                 n = 0;
 106                                 STAILQ_FOREACH(cur, &head, bufs)
 107                                         smapattr[n++] = cur->xattr &
 108                                             SMAP_XATTR_MASK;
 109                         }
 110                 } else
 111                         smapattr = NULL;
 112                 cur = STAILQ_FIRST(&head);
 113                 while (cur != NULL) {
 114                         next = STAILQ_NEXT(cur, bufs);
 115                         free(cur);
 116                         cur = next;
 117                 }
 118         }
 119 }
 120
 121 void
 122 bios_addsmapdata(struct preloaded_file *kfp)
 123 {
 124         size_t                  size;
 125
 126         if (smapbase == NULL || smaplen == 0)
 127                 return;
 128         size = smaplen * sizeof(*smapbase);
 129         file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase);
 130         if (smapattr != NULL) {
 131                 size = smaplen * sizeof(*smapattr);
 132                 file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr);
 133         }
 134 }
 135
 136 COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
 137
 138 static int
 139 command_smap(int argc, char *argv[])
 140 {
 141         u_int                   i;
 142
 143         if (smapbase == NULL || smaplen == 0)
 144                 return (CMD_ERROR);
 145         if (smapattr != NULL)
 146                 for (i = 0; i < smaplen; i++)
 147                         printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n",
 148                             (unsigned int)smapbase[i].type,
 149                             (unsigned long long)smapbase[i].base,
 150                             (unsigned long long)smapbase[i].length,
 151                             (unsigned int)smapattr[i]);
 152         else
 153                 for (i = 0; i < smaplen; i++)
 154                         printf("SMAP type=%02x base=%016llx len=%016llx\n",
 155                             (unsigned int)smapbase[i].type,
 156                             (unsigned long long)smapbase[i].base,
 157                             (unsigned long long)smapbase[i].length);
 158         return (CMD_OK);
 159 }