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Current Path: /usr/src/stand/i386/libi386

📁 ..
📄 Makefile(1.46 KB)
📄 Makefile.depend(219 B)
📄 amd64_tramp.S(2.82 KB)
📄 bio.c(2.14 KB)
📄 biosacpi.c(4.52 KB)
📄 biosdisk.c(31.58 KB)
📄 biosmem.c(7.21 KB)
📄 biospci.c(9.84 KB)
📄 biospnp.c(7.42 KB)
📄 biossmap.c(4.31 KB)
📄 bootinfo.c(3.64 KB)
📄 bootinfo32.c(8.63 KB)
📄 bootinfo64.c(8.08 KB)
📄 comconsole.c(9.37 KB)
📄 devicename.c(5.3 KB)
📄 elf32_freebsd.c(2.76 KB)
📄 elf64_freebsd.c(3.75 KB)
📄 i386_copy.c(2.13 KB)
📄 i386_module.c(1.59 KB)
📄 libi386.h(5.18 KB)
📄 multiboot.c(11.19 KB)
📄 multiboot.h(6.77 KB)
📄 multiboot_tramp.S(2.06 KB)
📄 nullconsole.c(2.67 KB)
📄 pread.c(2.42 KB)
📄 pxe.c(13.8 KB)
📄 pxe.h(14.61 KB)
📄 pxetramp.S(1.01 KB)
📄 relocater_tramp.S(8.32 KB)
📄 spinconsole.c(3.11 KB)
📄 time.c(3.13 KB)
📄 vbe.c(27.6 KB)
📄 vbe.h(5.43 KB)
📄 vidconsole.c(33.89 KB)

Editing: bio.c

/*-
 * Copyright 2018 Toomas Soome <tsoome@me.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <stand.h>
#include "libi386.h"

/*
 * The idea is borrowed from pxe.c and zfsimpl.c. The original buffer
 * space in pxe.c was 2x 0x2000. Allocating it from BSS will give us needed
 * memory below 1MB and usable for real mode calls.
 *
 * Note the allocations and frees are to be done in reverse order (LIFO).
 */

static char bio_buffer[BIO_BUFFER_SIZE];
static char *bio_buffer_end = bio_buffer + BIO_BUFFER_SIZE;
static char *bio_buffer_ptr = bio_buffer;

void *
bio_alloc(size_t size)
{
	char *ptr;

ptr = bio_buffer_ptr;
	if (ptr + size > bio_buffer_end)
		return (NULL);
	bio_buffer_ptr += size;

return (ptr);
}

void
bio_free(void *ptr, size_t size)
{

if (ptr == NULL)
		return;

bio_buffer_ptr -= size;
	if (bio_buffer_ptr != ptr)
		panic("bio_alloc()/bio_free() mismatch\n");
}

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Editing: bio.c

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