1/*- 2 * Copyright (c) 2013 The FreeBSD Foundation 3 * 4 * This software was developed by Benno Rice under sponsorship from 5 * the FreeBSD Foundation. 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30#include <machine/asmacros.h> 31 32#define ASM_FILE 33#include "multiboot2.h" 34 35 .text 36 .globl amd64_tramp 37 38/* 39 * void amd64_tramp(uint64_t stack, void *copy_finish, uint64_t kernend, 40 * uint64_t modulep, uint64_t pagetable, uint64_t entry) 41 */ 42amd64_tramp: 43 cli /* Make sure we don't get interrupted. */ 44 movq %rdi,%rsp /* Switch to our temporary stack. */ 45 46 movq %rdx,%r12 /* Stash the kernel values for later. */ 47 movq %rcx,%r13 48 movq %r8,%r14 49 movq %r9,%r15 50 51 callq *%rsi /* Call copy_finish so we're all ready to go. */ 52 53 pushq %r12 /* Push kernend. */ 54 salq $32,%r13 /* Shift modulep and push it. */ 55 pushq %r13 56 pushq %r15 /* Push the entry address. */ 57 movq %r14,%cr3 /* Switch page tables. */ 58 ret /* "Return" to kernel entry. */ 59 60 ALIGN_TEXT 61amd64_tramp_end: 62 63/* void multiboot2_exec(uint64_t entry, uint64_t multiboot_info, uint64_t stack) */ 64 .globl multiboot2_exec 65multiboot2_exec: 66 movq %rdx,%rsp 67 pushq %rdi 68 movq %rsi,%rbx 69 movq $MULTIBOOT2_BOOTLOADER_MAGIC,%rax 70 ret 71 72 .data 73 .globl amd64_tramp_size 74amd64_tramp_size: 75 .long amd64_tramp_end-amd64_tramp 76