124 lines
3.4 KiB
ArmAsm
124 lines
3.4 KiB
ArmAsm
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
|
|
* Copyright (C) 2009 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/* Based on the code from FreeBSD originally distributed under the
|
|
following terms: */
|
|
|
|
/*-
|
|
* Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
|
|
#define MSR_EFER 0xc0000080
|
|
#define EFER_LME 0x00000100
|
|
#define CR4_PAE 0x00000020
|
|
#define CR4_PSE 0x00000010
|
|
#define CR0_PG 0x80000000
|
|
|
|
#include <grub/symbol.h>
|
|
|
|
.p2align 2
|
|
|
|
.code32
|
|
|
|
|
|
VARIABLE(grub_bsd64_trampoline_start)
|
|
|
|
/* Discard `grub_unix_real_boot' return address. */
|
|
popl %eax
|
|
|
|
/* entry */
|
|
popl %edi
|
|
|
|
/* entry_hi */
|
|
popl %esi
|
|
|
|
cli
|
|
|
|
/* Turn on EFER.LME. */
|
|
movl $MSR_EFER, %ecx
|
|
rdmsr
|
|
orl $EFER_LME, %eax
|
|
wrmsr
|
|
|
|
/* Turn on PAE. */
|
|
movl %cr4, %eax
|
|
orl $(CR4_PAE | CR4_PSE), %eax
|
|
movl %eax, %cr4
|
|
|
|
/* Set %cr3 for PT4. */
|
|
popl %eax
|
|
movl %eax, %cr3
|
|
|
|
/* Push a dummy return address. */
|
|
pushl %eax
|
|
|
|
/* Turn on paging (implicitly sets EFER.LMA). */
|
|
movl %cr0, %eax
|
|
orl $CR0_PG, %eax
|
|
movl %eax, %cr0
|
|
|
|
/* Now we're in compatability mode. set %cs for long mode. */
|
|
/* lgdt */
|
|
.byte 0x0f
|
|
.byte 0x01
|
|
.byte 0x15
|
|
VARIABLE (grub_bsd64_trampoline_gdt)
|
|
.long 0x0
|
|
|
|
/* ljmp */
|
|
.byte 0xea
|
|
VARIABLE (grub_bsd64_trampoline_selfjump)
|
|
.long 0x0
|
|
.word 0x08
|
|
|
|
.code64
|
|
|
|
bsd64_longmode:
|
|
/* We're still running V=P, jump to entry point. */
|
|
movl %esi, %eax
|
|
salq $32, %rax
|
|
orq %rdi, %rax
|
|
pushq %rax
|
|
ret
|
|
VARIABLE(grub_bsd64_trampoline_end)
|