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/psl.h>
  40 #include <machine/pc/bios.h>
  41 #include "bootstrap.h"
  42 #include "libi386.h"
  43 #include "btxv86.h"
  44
  45 #define V86_CY(x)       ((x) & PSL_C)
  46
  47 struct smap_buf {
  48         struct bios_smap        smap;
  49         uint32_t                xattr;  /* Extended attribute from ACPI 3.0 */
  50         STAILQ_ENTRY(smap_buf)  bufs;
  51 };
  52
  53 #define SMAP_BUFSIZE            offsetof(struct smap_buf, bufs)
  54
  55 static struct bios_smap         *smapbase;
  56 static uint32_t                 *smapattr;
  57 static u_int                    smaplen;
  58
  59 void
  60 bios_getsmap(void)
  61 {
  62         struct smap_buf         buf;
  63         STAILQ_HEAD(smap_head, smap_buf) head =
  64             STAILQ_HEAD_INITIALIZER(head);
  65         struct smap_buf         *cur, *next;
  66         u_int                   n, x;
  67
  68         STAILQ_INIT(&head);
  69         n = 0;
  70         x = 0;
  71         v86.ebx = 0;
  72         do {
  73                 v86.ctl = V86_FLAGS;
  74                 v86.addr = 0x15;
  75                 v86.eax = 0xe820;       /* int 0x15 function 0xe820 */
  76                 v86.ecx = SMAP_BUFSIZE;
  77                 v86.edx = SMAP_SIG;
  78                 v86.es = VTOPSEG(&buf);
  79                 v86.edi = VTOPOFF(&buf);
  80                 v86int();
  81                 if (V86_CY(v86.efl) || v86.eax != SMAP_SIG ||
  82                     v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE)
  83                         break;
  84
  85                 next = malloc(sizeof(*next));
  86                 if (next == NULL)
  87                         break;
  88                 next->smap = buf.smap;
  89                 if (v86.ecx == SMAP_BUFSIZE) {
  90                         next->xattr = buf.xattr;
  91                         x++;
  92                 }
  93                 STAILQ_INSERT_TAIL(&head, next, bufs);
  94                 n++;
  95         } while (v86.ebx != 0);
  96         smaplen = n;
  97
  98         if (smaplen > 0) {
  99                 smapbase = malloc(smaplen * sizeof(*smapbase));
 100                 if (smapbase != NULL) {
 101                         n = 0;
 102                         STAILQ_FOREACH(cur, &head, bufs)
 103                                 smapbase[n++] = cur->smap;
 104                 }
 105                 if (smaplen == x) {
 106                         smapattr = malloc(smaplen * sizeof(*smapattr));
 107                         if (smapattr != NULL) {
 108                                 n = 0;
 109                                 STAILQ_FOREACH(cur, &head, bufs)
 110                                         smapattr[n++] = cur->xattr &
 111                                             SMAP_XATTR_MASK;
 112                         }
 113                 } else
 114                         smapattr = NULL;
 115                 cur = STAILQ_FIRST(&head);
 116                 while (cur != NULL) {
 117                         next = STAILQ_NEXT(cur, bufs);
 118                         free(cur);
 119                         cur = next;
 120                 }
 121         }
 122 }
 123
 124 void
 125 bios_addsmapdata(struct preloaded_file *kfp)
 126 {
 127         size_t                  size;
 128
 129         if (smapbase == NULL || smaplen == 0)
 130                 return;
 131         size = smaplen * sizeof(*smapbase);
 132         file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase);
 133         if (smapattr != NULL) {
 134                 size = smaplen * sizeof(*smapattr);
 135                 file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr);
 136         }
 137 }
 138
 139 COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
 140
 141 static int
 142 command_smap(int argc, char *argv[])
 143 {
 144         u_int                   i;
 145
 146         if (smapbase == NULL || smaplen == 0)
 147                 return (CMD_ERROR);
 148         if (smapattr != NULL)
 149                 for (i = 0; i < smaplen; i++)
 150                         printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n",
 151                             (unsigned int)smapbase[i].type,
 152                             (unsigned long long)smapbase[i].base,
 153                             (unsigned long long)smapbase[i].length,
 154                             (unsigned int)smapattr[i]);
 155         else
 156                 for (i = 0; i < smaplen; i++)
 157                         printf("SMAP type=%02x base=%016llx len=%016llx\n",
 158                             (unsigned int)smapbase[i].type,
 159                             (unsigned long long)smapbase[i].base,
 160                             (unsigned long long)smapbase[i].length);
 161         return (CMD_OK);
 162 }