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107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Obtain memory configuration information from the BIOS
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*/
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#include <stand.h>
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <machine/metadata.h>
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#include "bootstrap.h"
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#include "libi386.h"
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#include "btxv86.h"
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#define SMAPSIG 0x534D4150
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struct smap {
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u_int64_t base;
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u_int64_t length;
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u_int32_t type;
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} __packed;
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static struct smap smap;
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static struct smap *smapbase;
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static int smaplen;
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void
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bios_getsmap(void)
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{
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int n;
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n = 0;
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smaplen = 0;
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/* Count up segments in system memory map */
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v86.ebx = 0;
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do {
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v86.ctl = V86_FLAGS;
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v86.addr = 0x15; /* int 0x15 function 0xe820*/
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v86.eax = 0xe820;
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v86.ecx = sizeof(struct smap);
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v86.edx = SMAPSIG;
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v86.es = VTOPSEG(&smap);
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v86.edi = VTOPOFF(&smap);
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v86int();
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if ((v86.efl & 1) || (v86.eax != SMAPSIG))
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break;
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n++;
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} while (v86.ebx != 0);
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if (n == 0)
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return;
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n += 10; /* spare room */
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smapbase = malloc(n * sizeof(*smapbase));
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/* Save system memory map */
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v86.ebx = 0;
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do {
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v86.ctl = V86_FLAGS;
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v86.addr = 0x15; /* int 0x15 function 0xe820*/
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v86.eax = 0xe820;
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v86.ecx = sizeof(struct smap);
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v86.edx = SMAPSIG;
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v86.es = VTOPSEG(&smapbase[smaplen]);
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v86.edi = VTOPOFF(&smapbase[smaplen]);
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v86int();
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smaplen++;
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if ((v86.efl & 1) || (v86.eax != SMAPSIG))
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break;
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} while (v86.ebx != 0 && smaplen < n);
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}
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void
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bios_addsmapdata(struct preloaded_file *kfp)
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{
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int len;
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if (smapbase == 0 || smaplen == 0)
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return;
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len = smaplen * sizeof(*smapbase);
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file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
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}
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