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