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 } 158