124 lines
3.4 KiB
ArmAsm
124 lines
3.4 KiB
ArmAsm
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Based on the code from FreeBSD originally distributed under the
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following terms: */
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/*-
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* Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#define MSR_EFER 0xc0000080
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#define EFER_LME 0x00000100
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#define CR4_PAE 0x00000020
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#define CR4_PSE 0x00000010
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#define CR0_PG 0x80000000
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#include <grub/symbol.h>
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.p2align 2
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.code32
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VARIABLE(grub_bsd64_trampoline_start)
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/* Discard `grub_unix_real_boot' return address. */
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popl %eax
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/* entry */
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popl %edi
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/* entry_hi */
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popl %esi
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cli
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/* Turn on EFER.LME. */
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movl $MSR_EFER, %ecx
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rdmsr
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orl $EFER_LME, %eax
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wrmsr
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/* Turn on PAE. */
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movl %cr4, %eax
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orl $(CR4_PAE | CR4_PSE), %eax
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movl %eax, %cr4
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/* Set %cr3 for PT4. */
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popl %eax
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movl %eax, %cr3
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/* Push a dummy return address. */
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pushl %eax
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/* Turn on paging (implicitly sets EFER.LMA). */
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movl %cr0, %eax
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orl $CR0_PG, %eax
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movl %eax, %cr0
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/* Now we're in compatibility mode. set %cs for long mode. */
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/* lgdt */
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.byte 0x0f
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.byte 0x01
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.byte 0x15
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VARIABLE (grub_bsd64_trampoline_gdt)
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.long 0x0
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/* ljmp */
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.byte 0xea
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VARIABLE (grub_bsd64_trampoline_selfjump)
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.long 0x0
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.word 0x08
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.code64
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bsd64_longmode:
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/* We're still running V=P, jump to entry point. */
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movl %esi, %eax
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salq $32, %rax
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orq %rdi, %rax
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pushq %rax
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ret
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VARIABLE(grub_bsd64_trampoline_end)
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