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