acpi_wakecode.S revision 210777
1189903Sjkim/*- 2189903Sjkim * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> 3189903Sjkim * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> 4189903Sjkim * Copyright (c) 2003 Peter Wemm 5210777Sjkim * Copyright (c) 2008-2010 Jung-uk Kim <jkim@FreeBSD.org> 6189903Sjkim * All rights reserved. 7189903Sjkim * 8189903Sjkim * Redistribution and use in source and binary forms, with or without 9189903Sjkim * modification, are permitted provided that the following conditions 10189903Sjkim * are met: 11189903Sjkim * 1. Redistributions of source code must retain the above copyright 12189903Sjkim * notice, this list of conditions and the following disclaimer. 13189903Sjkim * 2. Redistributions in binary form must reproduce the above copyright 14189903Sjkim * notice, this list of conditions and the following disclaimer in the 15189903Sjkim * documentation and/or other materials provided with the distribution. 16189903Sjkim * 17189903Sjkim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18189903Sjkim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19189903Sjkim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20189903Sjkim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21189903Sjkim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22189903Sjkim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23189903Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24189903Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25189903Sjkim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26189903Sjkim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27189903Sjkim * SUCH DAMAGE. 28189903Sjkim * 29189903Sjkim * $FreeBSD: head/sys/amd64/acpica/acpi_wakecode.S 210777 2010-08-02 17:35:00Z jkim $ 30189903Sjkim */ 31189903Sjkim 32189903Sjkim#include <machine/asmacros.h> 33189903Sjkim#include <machine/specialreg.h> 34189903Sjkim 35189903Sjkim#include "assym.s" 36189903Sjkim 37189903Sjkim/* 38189903Sjkim * Resume entry point for real mode. 39189903Sjkim * 40189903Sjkim * If XFirmwareWakingVector is zero and FirmwareWakingVector is non-zero 41189903Sjkim * in FACS, the BIOS enters here in real mode after POST with CS set to 42189903Sjkim * (FirmwareWakingVector >> 4) and IP set to (FirmwareWakingVector & 0xf). 43189903Sjkim * Depending on the previous sleep state, we may need to initialize more 44189903Sjkim * of the system (i.e., S3 suspend-to-RAM vs. S4 suspend-to-disk). 45189903Sjkim * 46189903Sjkim * Note: If XFirmwareWakingVector is non-zero, it should disable address 47189903Sjkim * translation/paging and interrupts, load all segment registers with 48189903Sjkim * a flat 4 GB address space, and set EFLAGS.IF to zero. Currently 49189903Sjkim * this mode is not supported by this code. 50189903Sjkim */ 51189903Sjkim 52189903Sjkim .data /* So we can modify it */ 53189903Sjkim 54189903Sjkim ALIGN_TEXT 55197863Sjkim .code16 56189903Sjkimwakeup_start: 57189903Sjkim /* 58189903Sjkim * Set up segment registers for real mode, a small stack for 59189903Sjkim * any calls we make, and clear any flags. 60189903Sjkim */ 61189903Sjkim cli /* make sure no interrupts */ 62189903Sjkim mov %cs, %ax /* copy %cs to %ds. Remember these */ 63189903Sjkim mov %ax, %ds /* are offsets rather than selectors */ 64189903Sjkim mov %ax, %ss 65197863Sjkim movw $PAGE_SIZE, %sp 66190341Sjkim xorw %ax, %ax 67190341Sjkim pushw %ax 68189903Sjkim popfw 69189903Sjkim 70189903Sjkim /* To debug resume hangs, beep the speaker if the user requested. */ 71190341Sjkim testb $~0, resume_beep - wakeup_start 72190341Sjkim jz 1f 73190341Sjkim movb $0, resume_beep - wakeup_start 74189903Sjkim movb $0xc0, %al 75189903Sjkim outb %al, $0x42 76189903Sjkim movb $0x04, %al 77189903Sjkim outb %al, $0x42 78189903Sjkim inb $0x61, %al 79189903Sjkim orb $0x3, %al 80189903Sjkim outb %al, $0x61 81189903Sjkim1: 82189903Sjkim 83189903Sjkim /* Re-initialize video BIOS if the reset_video tunable is set. */ 84190341Sjkim testb $~0, reset_video - wakeup_start 85190341Sjkim jz 1f 86190341Sjkim movb $0, reset_video - wakeup_start 87189903Sjkim lcall $0xc000, $3 88189903Sjkim 89198422Sjkim /* When we reach here, int 0x10 should be ready. Hide cursor. */ 90198422Sjkim movb $0x01, %ah 91198422Sjkim movb $0x20, %ch 92198422Sjkim int $0x10 93198422Sjkim 94190341Sjkim /* Re-start in case the previous BIOS call clobbers them. */ 95190341Sjkim jmp wakeup_start 96189903Sjkim1: 97189903Sjkim 98189903Sjkim /* 99189903Sjkim * Find relocation base and patch the gdt descript and ljmp targets 100189903Sjkim */ 101189903Sjkim xorl %ebx, %ebx 102189903Sjkim mov %cs, %bx 103189903Sjkim sall $4, %ebx /* %ebx is now our relocation base */ 104189903Sjkim 105189903Sjkim /* 106189903Sjkim * Load the descriptor table pointer. We'll need it when running 107189903Sjkim * in 16-bit protected mode. 108189903Sjkim */ 109189903Sjkim lgdtl bootgdtdesc - wakeup_start 110189903Sjkim 111189903Sjkim /* Enable protected mode */ 112189903Sjkim movl $CR0_PE, %eax 113189903Sjkim mov %eax, %cr0 114189903Sjkim 115189903Sjkim /* 116189903Sjkim * Now execute a far jump to turn on protected mode. This 117189903Sjkim * causes the segment registers to turn into selectors and causes 118189903Sjkim * %cs to be loaded from the gdt. 119189903Sjkim * 120189903Sjkim * The following instruction is: 121189903Sjkim * ljmpl $bootcode32 - bootgdt, $wakeup_32 - wakeup_start 122189903Sjkim * but gas cannot assemble that. And besides, we patch the targets 123189903Sjkim * in early startup and its a little clearer what we are patching. 124189903Sjkim */ 125189903Sjkimwakeup_sw32: 126189903Sjkim .byte 0x66 /* size override to 32 bits */ 127189903Sjkim .byte 0xea /* opcode for far jump */ 128189903Sjkim .long wakeup_32 - wakeup_start /* offset in segment */ 129189903Sjkim .word bootcode32 - bootgdt /* index in gdt for 32 bit code */ 130189903Sjkim 131189903Sjkim /* 132189903Sjkim * At this point, we are running in 32 bit legacy protected mode. 133189903Sjkim */ 134197863Sjkim ALIGN_TEXT 135189903Sjkim .code32 136189903Sjkimwakeup_32: 137189903Sjkim 138189903Sjkim mov $bootdata32 - bootgdt, %eax 139189903Sjkim mov %ax, %ds 140189903Sjkim 141189903Sjkim /* Turn on the PAE and PSE bits for when paging is enabled */ 142189903Sjkim mov %cr4, %eax 143189903Sjkim orl $(CR4_PAE | CR4_PSE), %eax 144189903Sjkim mov %eax, %cr4 145189903Sjkim 146189903Sjkim /* 147189903Sjkim * Enable EFER.LME so that we get long mode when all the prereqs are 148189903Sjkim * in place. In this case, it turns on when CR0_PG is finally enabled. 149189903Sjkim * Pick up a few other EFER bits that we'll use need we're here. 150189903Sjkim */ 151189903Sjkim movl $MSR_EFER, %ecx 152189903Sjkim rdmsr 153189903Sjkim orl $EFER_LME | EFER_SCE, %eax 154189903Sjkim wrmsr 155189903Sjkim 156189903Sjkim /* 157189903Sjkim * Point to the embedded page tables for startup. Note that this 158189903Sjkim * only gets accessed after we're actually in 64 bit mode, however 159189903Sjkim * we can only set the bottom 32 bits of %cr3 in this state. This 160189903Sjkim * means we are required to use a temporary page table that is below 161189903Sjkim * the 4GB limit. %ebx is still our relocation base. We could just 162189903Sjkim * subtract 3 * PAGE_SIZE, but that would be too easy. 163189903Sjkim */ 164189903Sjkim leal wakeup_pagetables - wakeup_start(%ebx), %eax 165189903Sjkim movl (%eax), %eax 166189903Sjkim mov %eax, %cr3 167189903Sjkim 168189903Sjkim /* 169189903Sjkim * Finally, switch to long bit mode by enabling paging. We have 170189903Sjkim * to be very careful here because all the segmentation disappears 171189903Sjkim * out from underneath us. The spec says we can depend on the 172189903Sjkim * subsequent pipelined branch to execute, but *only if* everthing 173189903Sjkim * is still identity mapped. If any mappings change, the pipeline 174189903Sjkim * will flush. 175189903Sjkim */ 176189903Sjkim mov %cr0, %eax 177189903Sjkim orl $CR0_PG, %eax 178189903Sjkim mov %eax, %cr0 179189903Sjkim 180189903Sjkim /* 181189903Sjkim * At this point paging is enabled, and we are in "compatability" mode. 182189903Sjkim * We do another far jump to reload %cs with the 64 bit selector. 183189903Sjkim * %cr3 points to a 4-level page table page. 184189903Sjkim * We cannot yet jump all the way to the kernel because we can only 185189903Sjkim * specify a 32 bit linear address. So, yet another trampoline. 186189903Sjkim * 187189903Sjkim * The following instruction is: 188189903Sjkim * ljmp $bootcode64 - bootgdt, $wakeup_64 - wakeup_start 189189903Sjkim * but gas cannot assemble that. And besides, we patch the targets 190189903Sjkim * in early startup and its a little clearer what we are patching. 191189903Sjkim */ 192189903Sjkimwakeup_sw64: 193189903Sjkim .byte 0xea /* opcode for far jump */ 194189903Sjkim .long wakeup_64 - wakeup_start /* offset in segment */ 195189903Sjkim .word bootcode64 - bootgdt /* index in gdt for 64 bit code */ 196189903Sjkim 197189903Sjkim /* 198189903Sjkim * Yeehar! We're running in 64-bit mode! We can mostly ignore our 199189903Sjkim * segment registers, and get on with it. 200189903Sjkim * Note that we are running at the correct virtual address, but with 201189903Sjkim * a 1:1 1GB mirrored mapping over entire address space. We had better 202189903Sjkim * switch to a real %cr3 promptly so that we can get to the direct map 203189903Sjkim * space. Remember that jmp is relative and that we've been relocated, 204189903Sjkim * so use an indirect jump. 205189903Sjkim */ 206190341Sjkim ALIGN_TEXT 207189903Sjkim .code64 208189903Sjkimwakeup_64: 209189903Sjkim mov $bootdata64 - bootgdt, %eax 210189903Sjkim mov %ax, %ds 211189903Sjkim 212189903Sjkim /* Restore arguments and return. */ 213189903Sjkim movq wakeup_ctx - wakeup_start(%rbx), %rdi 214189903Sjkim movq wakeup_kpml4 - wakeup_start(%rbx), %rsi 215189903Sjkim movq wakeup_retaddr - wakeup_start(%rbx), %rax 216189903Sjkim jmp *%rax 217189903Sjkim 218190341Sjkim .data 219190341Sjkim 220190341Sjkimresume_beep: 221190341Sjkim .byte 0 222190341Sjkimreset_video: 223190341Sjkim .byte 0 224190341Sjkim 225189903Sjkim ALIGN_DATA 226189903Sjkimbootgdt: 227189903Sjkim .long 0x00000000 228189903Sjkim .long 0x00000000 229190635Sjkim .long 0x00000000 230190635Sjkim .long 0x00000000 231190635Sjkim .long 0x00000000 232190635Sjkim .long 0x00000000 233190635Sjkim .long 0x00000000 234190635Sjkim .long 0x00000000 235189903Sjkim 236189903Sjkimbootcode64: 237189903Sjkim .long 0x0000ffff 238189903Sjkim .long 0x00af9b00 239189903Sjkim 240189903Sjkimbootdata64: 241189903Sjkim .long 0x0000ffff 242189903Sjkim .long 0x00af9300 243189903Sjkim 244189903Sjkimbootcode32: 245189903Sjkim .long 0x0000ffff 246189903Sjkim .long 0x00cf9b00 247189903Sjkim 248189903Sjkimbootdata32: 249189903Sjkim .long 0x0000ffff 250189903Sjkim .long 0x00cf9300 251189903Sjkimbootgdtend: 252189903Sjkim 253189903Sjkimwakeup_pagetables: 254189903Sjkim .long 0 255189903Sjkim 256189903Sjkimbootgdtdesc: 257189903Sjkim .word bootgdtend - bootgdt /* Length */ 258189903Sjkim .long bootgdt - wakeup_start /* Offset plus %ds << 4 */ 259189903Sjkim 260189903Sjkim ALIGN_DATA 261189903Sjkimwakeup_retaddr: 262189903Sjkim .quad 0 263189903Sjkimwakeup_kpml4: 264189903Sjkim .quad 0 265189903Sjkim 266189903Sjkimwakeup_ctx: 267189903Sjkim .quad 0 268210777Sjkimwakeup_pcb: 269189903Sjkim .quad 0 270189903Sjkimwakeup_gdt: 271189903Sjkim .word 0 272189903Sjkim .quad 0 273190635Sjkim 274190635Sjkim ALIGN_DATA 275189903Sjkimwakeup_efer: 276189903Sjkim .quad 0 277189903Sjkimwakeup_pat: 278189903Sjkim .quad 0 279189903Sjkimwakeup_star: 280189903Sjkim .quad 0 281189903Sjkimwakeup_lstar: 282189903Sjkim .quad 0 283189903Sjkimwakeup_cstar: 284189903Sjkim .quad 0 285189903Sjkimwakeup_sfmask: 286189903Sjkim .quad 0 287189903Sjkimwakeup_cpu: 288189903Sjkim .long 0 289189903Sjkimdummy: 290