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 /* 28 * Obtain memory configuration information from the BIOS 29 */ 30 #include <stand.h> 31 #include <sys/param.h> 32 #include <sys/linker.h> 33 #include <sys/queue.h> 34 #include <sys/stddef.h> 35 #include <machine/metadata.h> 36 #include <machine/pc/bios.h> 37 #include "bootstrap.h" 38 #include "libi386.h" 39 #include "btxv86.h" 40 41 struct smap_buf { 42 struct bios_smap smap; 43 uint32_t xattr; /* Extended attribute from ACPI 3.0 */ 44 STAILQ_ENTRY(smap_buf) bufs; 45 }; 46 47 #define SMAP_BUFSIZE offsetof(struct smap_buf, bufs) 48 49 static struct bios_smap *smapbase; 50 static uint32_t *smapattr; 51 static u_int smaplen; 52 53 void 54 bios_getsmap(void) 55 { 56 struct smap_buf buf; 57 STAILQ_HEAD(smap_head, smap_buf) head = 58 STAILQ_HEAD_INITIALIZER(head); 59 struct smap_buf *cur, *next; 60 u_int n, x; 61 62 STAILQ_INIT(&head); 63 n = 0; 64 x = 0; 65 v86.ebx = 0; 66 do { 67 v86.ctl = V86_FLAGS; 68 v86.addr = 0x15; 69 v86.eax = 0xe820; /* int 0x15 function 0xe820 */ 70 v86.ecx = SMAP_BUFSIZE; 71 v86.edx = SMAP_SIG; 72 v86.es = VTOPSEG(&buf); 73 v86.edi = VTOPOFF(&buf); 74 v86int(); 75 if (V86_CY(v86.efl) || v86.eax != SMAP_SIG || 76 v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE) 77 break; 78 79 next = malloc(sizeof(*next)); 80 if (next == NULL) 81 break; 82 next->smap = buf.smap; 83 if (v86.ecx == SMAP_BUFSIZE) { 84 next->xattr = buf.xattr; 85 x++; 86 } 87 STAILQ_INSERT_TAIL(&head, next, bufs); 88 n++; 89 } while (v86.ebx != 0); 90 smaplen = n; 91 92 if (smaplen > 0) { 93 smapbase = malloc(smaplen * sizeof(*smapbase)); 94 if (smapbase != NULL) { 95 n = 0; 96 STAILQ_FOREACH(cur, &head, bufs) 97 smapbase[n++] = cur->smap; 98 } 99 if (smaplen == x) { 100 smapattr = malloc(smaplen * sizeof(*smapattr)); 101 if (smapattr != NULL) { 102 n = 0; 103 STAILQ_FOREACH(cur, &head, bufs) 104 smapattr[n++] = cur->xattr & 105 SMAP_XATTR_MASK; 106 } 107 } else 108 smapattr = NULL; 109 cur = STAILQ_FIRST(&head); 110 while (cur != NULL) { 111 next = STAILQ_NEXT(cur, bufs); 112 free(cur); 113 cur = next; 114 } 115 } 116 } 117 118 void 119 bios_addsmapdata(struct preloaded_file *kfp) 120 { 121 size_t size; 122 123 if (smapbase == NULL || smaplen == 0) 124 return; 125 size = smaplen * sizeof(*smapbase); 126 file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase); 127 if (smapattr != NULL) { 128 size = smaplen * sizeof(*smapattr); 129 file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr); 130 } 131 } 132 133 COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap); 134 135 static int 136 command_smap(int argc, char *argv[]) 137 { 138 u_int i; 139 140 if (smapbase == NULL || smaplen == 0) 141 return (CMD_ERROR); 142 if (smapattr != NULL) 143 for (i = 0; i < smaplen; i++) 144 printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n", 145 (unsigned int)smapbase[i].type, 146 (unsigned long long)smapbase[i].base, 147 (unsigned long long)smapbase[i].length, 148 (unsigned int)smapattr[i]); 149 else 150 for (i = 0; i < smaplen; i++) 151 printf("SMAP type=%02x base=%016llx len=%016llx\n", 152 (unsigned int)smapbase[i].type, 153 (unsigned long long)smapbase[i].base, 154 (unsigned long long)smapbase[i].length); 155 return (CMD_OK); 156 } 157