915dad0e92
memory directly available to loader(8) and friends was limited to 640K on i386. Those times have passed long time ago and now loader(8) can directly access up to 4GB of RAM at least theoretically. At the same time, there are several places where it's assumed that malloc() will only allocate memory within first megabyte. Remove that assumption by allocating appropriate bounce buffers for BIOS calls on stack where necessary. This allows using memory above first megabyte for heap if necessary.
108 lines
2.9 KiB
C
108 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(&smap);
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v86.edi = VTOPOFF(&smap);
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v86int();
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bcopy(&smap, &smapbase[smaplen], sizeof(struct smap));
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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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