1/*- 2 * Copyright (c) 2014 Roger Pau Monné <royger@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 * $FreeBSD$ 27 */ 28 29/* 30 * The multiboot specification requires the executable to be launched 31 * with %cs set to a flat read/execute segment with offset 0 and limit 32 * 0xFFFFFFFF, and the rest of the segment registers (%ds, %es, %fs, 33 * %gs, %ss) to flat read/write segments with the same offset and limit. 34 * This is already done by the BTX code before calling multiboot_tramp, 35 * so there is no need to do anything here. 36 */ 37 38 .globl multiboot_tramp 39multiboot_tramp: 40 /* Be sure that interrupts are disabled. */ 41 cli 42 43 movl 4(%esp), %eax /* bootloader magic */ 44 /* Get the entry point and address of the multiboot_info parameter. */ 45 movl 12(%esp), %ebx /* multiboot_info */ 46 movl 8(%esp), %ecx /* entry */ 47 48 call *%ecx 49