1*479ab7f0SSascha Wildner/*- 2*479ab7f0SSascha Wildner * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org> 3*479ab7f0SSascha Wildner * All rights reserved. 4*479ab7f0SSascha Wildner * 5*479ab7f0SSascha Wildner * Redistribution and use in source and binary forms, with or without 6*479ab7f0SSascha Wildner * modification, are permitted provided that the following conditions 7*479ab7f0SSascha Wildner * are met: 8*479ab7f0SSascha Wildner * 1. Redistributions of source code must retain the above copyright 9*479ab7f0SSascha Wildner * notice, this list of conditions and the following disclaimer. 10*479ab7f0SSascha Wildner * 2. Redistributions in binary form must reproduce the above copyright 11*479ab7f0SSascha Wildner * notice, this list of conditions and the following disclaimer in the 12*479ab7f0SSascha Wildner * documentation and/or other materials provided with the distribution. 13*479ab7f0SSascha Wildner * 14*479ab7f0SSascha Wildner * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15*479ab7f0SSascha Wildner * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16*479ab7f0SSascha Wildner * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17*479ab7f0SSascha Wildner * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18*479ab7f0SSascha Wildner * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19*479ab7f0SSascha Wildner * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20*479ab7f0SSascha Wildner * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21*479ab7f0SSascha Wildner * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22*479ab7f0SSascha Wildner * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23*479ab7f0SSascha Wildner * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24*479ab7f0SSascha Wildner * SUCH DAMAGE. 25*479ab7f0SSascha Wildner * 26*479ab7f0SSascha Wildner * $FreeBSD: src/sys/boot/i386/libi386/amd64_tramp.S,v 1.2 2003/05/17 00:30:51 peter Exp $ 27*479ab7f0SSascha Wildner */ 28*479ab7f0SSascha Wildner 29*479ab7f0SSascha Wildner#include "../bootasm.h" 30*479ab7f0SSascha Wildner 31*479ab7f0SSascha Wildner/* 32*479ab7f0SSascha Wildner * Quick and dirty trampoline to get into 64 bit (long) mode and running 33*479ab7f0SSascha Wildner * with paging enabled so that we enter the kernel at its linked address. 34*479ab7f0SSascha Wildner */ 35*479ab7f0SSascha Wildner#define MSR_EFER 0xc0000080 36*479ab7f0SSascha Wildner#define EFER_LME 0x00000100 37*479ab7f0SSascha Wildner#define CR4_PAE 0x00000020 38*479ab7f0SSascha Wildner#define CR4_PSE 0x00000010 39*479ab7f0SSascha Wildner#define CR0_PG 0x80000000 40*479ab7f0SSascha Wildner 41*479ab7f0SSascha Wildner/* GRRR. Deal with BTX that links us for a non-zero location */ 42*479ab7f0SSascha Wildner#define VTOP(x) ((x) + MEM_BTX_USR) 43*479ab7f0SSascha Wildner 44*479ab7f0SSascha Wildner .data 45*479ab7f0SSascha Wildner 46*479ab7f0SSascha Wildner .p2align 12,0x40 47*479ab7f0SSascha Wildner 48*479ab7f0SSascha Wildner .globl PT4 49*479ab7f0SSascha WildnerPT4: 50*479ab7f0SSascha Wildner .space 0x1000 51*479ab7f0SSascha Wildner .globl PT3 52*479ab7f0SSascha WildnerPT3: 53*479ab7f0SSascha Wildner .space 0x1000 54*479ab7f0SSascha Wildner .globl PT2 55*479ab7f0SSascha WildnerPT2: 56*479ab7f0SSascha Wildner .space 0x1000 57*479ab7f0SSascha Wildner 58*479ab7f0SSascha Wildnergdtdesc: 59*479ab7f0SSascha Wildner .word gdtend - gdt 60*479ab7f0SSascha Wildner .long VTOP(gdt) # low 61*479ab7f0SSascha Wildner .long 0 # high 62*479ab7f0SSascha Wildner 63*479ab7f0SSascha Wildnergdt: 64*479ab7f0SSascha Wildner .long 0 # null descriptor 65*479ab7f0SSascha Wildner .long 0 66*479ab7f0SSascha Wildner .long 0x00000000 # %cs 67*479ab7f0SSascha Wildner .long 0x00209800 68*479ab7f0SSascha Wildner .long 0x00000000 # %ds 69*479ab7f0SSascha Wildner .long 0x00008000 70*479ab7f0SSascha Wildnergdtend: 71*479ab7f0SSascha Wildner 72*479ab7f0SSascha Wildner .text 73*479ab7f0SSascha Wildner .code32 74*479ab7f0SSascha Wildner 75*479ab7f0SSascha Wildner .globl x86_64_tramp 76*479ab7f0SSascha Wildnerx86_64_tramp: 77*479ab7f0SSascha Wildner /* Be sure that interrupts are disabled */ 78*479ab7f0SSascha Wildner cli 79*479ab7f0SSascha Wildner 80*479ab7f0SSascha Wildner /* Turn on EFER.LME */ 81*479ab7f0SSascha Wildner movl $MSR_EFER, %ecx 82*479ab7f0SSascha Wildner rdmsr 83*479ab7f0SSascha Wildner orl $EFER_LME, %eax 84*479ab7f0SSascha Wildner wrmsr 85*479ab7f0SSascha Wildner 86*479ab7f0SSascha Wildner /* Turn on PAE */ 87*479ab7f0SSascha Wildner movl %cr4, %eax 88*479ab7f0SSascha Wildner orl $(CR4_PAE | CR4_PSE), %eax 89*479ab7f0SSascha Wildner movl %eax, %cr4 90*479ab7f0SSascha Wildner 91*479ab7f0SSascha Wildner /* Set %cr3 for PT4 */ 92*479ab7f0SSascha Wildner movl $VTOP(PT4), %eax 93*479ab7f0SSascha Wildner movl %eax, %cr3 94*479ab7f0SSascha Wildner 95*479ab7f0SSascha Wildner /* Turn on paging (implicitly sets EFER.LMA) */ 96*479ab7f0SSascha Wildner movl %cr0, %eax 97*479ab7f0SSascha Wildner orl $CR0_PG, %eax 98*479ab7f0SSascha Wildner movl %eax, %cr0 99*479ab7f0SSascha Wildner 100*479ab7f0SSascha Wildner /* Now we're in compatibility mode. set %cs for long mode */ 101*479ab7f0SSascha Wildner movl $VTOP(gdtdesc), %eax 102*479ab7f0SSascha Wildner movl VTOP(entry_hi), %esi 103*479ab7f0SSascha Wildner movl VTOP(entry_lo), %edi 104*479ab7f0SSascha Wildner lgdt (%eax) 105*479ab7f0SSascha Wildner ljmp $0x8, $VTOP(longmode) 106*479ab7f0SSascha Wildner 107*479ab7f0SSascha Wildner .code64 108*479ab7f0SSascha Wildnerlongmode: 109*479ab7f0SSascha Wildner /* We're still running V=P, jump to entry point */ 110*479ab7f0SSascha Wildner movl %esi, %eax 111*479ab7f0SSascha Wildner salq $32, %rax 112*479ab7f0SSascha Wildner orq %rdi, %rax 113*479ab7f0SSascha Wildner pushq %rax 114*479ab7f0SSascha Wildner ret 115