diff options
Diffstat (limited to 'stand/efi/loader/arch/amd64/amd64_tramp.S')
| -rw-r--r-- | stand/efi/loader/arch/amd64/amd64_tramp.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/stand/efi/loader/arch/amd64/amd64_tramp.S b/stand/efi/loader/arch/amd64/amd64_tramp.S new file mode 100644 index 000000000000..c102d9243589 --- /dev/null +++ b/stand/efi/loader/arch/amd64/amd64_tramp.S @@ -0,0 +1,64 @@ +/*- + * Copyright (c) 2013 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Benno Rice under sponsorship from + * the FreeBSD Foundation. + * 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. + * + * $FreeBSD$ + */ + +#include <machine/asmacros.h> + + .text + .globl amd64_tramp + +/* + * void amd64_tramp(uint64_t stack, void *copy_finish, uint64_t kernend, + * uint64_t modulep, uint64_t pagetable, uint64_t entry) + */ +amd64_tramp: + cli /* Make sure we don't get interrupted. */ + movq %rdi,%rsp /* Switch to our temporary stack. */ + + movq %rdx,%r12 /* Stash the kernel values for later. */ + movq %rcx,%r13 + movq %r8,%r14 + movq %r9,%r15 + + callq *%rsi /* Call copy_finish so we're all ready to go. */ + + pushq %r12 /* Push kernend. */ + salq $32,%r13 /* Shift modulep and push it. */ + pushq %r13 + pushq %r15 /* Push the entry address. */ + movq %r14,%cr3 /* Switch page tables. */ + ret /* "Return" to kernel entry. */ + + ALIGN_TEXT +amd64_tramp_end: + + .data + .globl amd64_tramp_size +amd64_tramp_size: + .long amd64_tramp_end-amd64_tramp |