1/*- 2 * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> 3 * Copyright (c) 2001-2012 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> 4 * Copyright (c) 2003 Peter Wemm 5 * Copyright (c) 2008-2012 Jung-uk Kim <jkim@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#include <machine/asmacros.h> 31#include <machine/specialreg.h> 32#include <x86/ppireg.h> 33#include <x86/timerreg.h> 34 35#include "assym.inc" 36 37/* 38 * Resume entry point. The BIOS enters here in real mode after POST with 39 * CS set to the page where we stored this code. It should configure the 40 * segment registers with a flat 4 GB address space and EFLAGS.IF = 0. 41 * Depending on the previous sleep state, we may need to initialize more 42 * of the system (i.e., S3 suspend-to-RAM vs. S4 suspend-to-disk). 43 */ 44 45 .data /* So we can modify it */ 46 47 ALIGN_TEXT 48 .code16 49wakeup_start: 50 /* 51 * Set up segment registers for real mode and a small stack for 52 * any calls we make. Set up full 32-bit bootstrap kernel flags 53 * since resumectx() doesn't restore flags. PSL_KERNEL gives 54 * bootstrap kernel flags (with interrupts disabled), not normal 55 * kernel flags. 56 */ 57 cli /* make sure no interrupts */ 58 mov %cs, %ax /* copy %cs to %ds. Remember these */ 59 mov %ax, %ds /* are offsets rather than selectors */ 60 mov %ax, %ss 61 movw $PAGE_SIZE, %sp 62 pushl $PSL_KERNEL 63 popfl 64 65 /* To debug resume hangs, beep the speaker if the user requested. */ 66 testb $~0, resume_beep - wakeup_start 67 jz 1f 68 movb $0, resume_beep - wakeup_start 69 70 /* Set PIC timer2 to beep. */ 71 movb $(TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT), %al 72 outb %al, $TIMER_MODE 73 74 /* Turn on speaker. */ 75 inb $IO_PPI, %al 76 orb $PIT_SPKR, %al 77 outb %al, $IO_PPI 78 79 /* Set frequency. */ 80 movw $0x4c0, %ax 81 outb %al, $TIMER_CNTR2 82 shrw $8, %ax 83 outb %al, $TIMER_CNTR2 841: 85 86 /* Re-initialize video BIOS if the reset_video tunable is set. */ 87 testb $~0, reset_video - wakeup_start 88 jz 1f 89 movb $0, reset_video - wakeup_start 90 lcall $0xc000, $3 91 92 /* When we reach here, int 0x10 should be ready. Hide cursor. */ 93 movb $0x01, %ah 94 movb $0x20, %ch 95 int $0x10 96 97 /* Re-start in case the previous BIOS call clobbers them. */ 98 jmp wakeup_start 991: 100 101 /* 102 * Find relocation base and patch the gdt descript and ljmp targets 103 */ 104 xorl %ebx, %ebx 105 mov %cs, %bx 106 sall $4, %ebx /* %ebx is now our relocation base */ 107 108 /* 109 * Load the descriptor table pointer. We'll need it when running 110 * in 16-bit protected mode. 111 */ 112 lgdtl bootgdtdesc - wakeup_start 113 114 /* Enable protected mode */ 115 movl $CR0_PE, %eax 116 mov %eax, %cr0 117 118 /* 119 * Now execute a far jump to turn on protected mode. This 120 * causes the segment registers to turn into selectors and causes 121 * %cs to be loaded from the gdt. 122 * 123 * The following instruction is: 124 * ljmpl $bootcode32 - bootgdt, $wakeup_32 - wakeup_start 125 * but gas cannot assemble that. And besides, we patch the targets 126 * in early startup and its a little clearer what we are patching. 127 */ 128wakeup_sw32: 129 .byte 0x66 /* size override to 32 bits */ 130 .byte 0xea /* opcode for far jump */ 131 .long wakeup_32 - wakeup_start /* offset in segment */ 132 .word bootcode32 - bootgdt /* index in gdt for 32 bit code */ 133 134 /* 135 * At this point, we are running in 32 bit legacy protected mode. 136 */ 137 ALIGN_TEXT 138 .code32 139wakeup_32: 140 141 mov $bootdata32 - bootgdt, %eax 142 mov %ax, %ds 143 144 /* Restore EFER, CR4 and CR3. */ 145 movl wakeup_efer - wakeup_start(%ebx), %eax 146 movl wakeup_efer - wakeup_start + 4(%ebx), %edx 147 cmpl $0, %eax 148 jne 1f 149 cmpl $0, %edx 150 je 2f 1511: movl $MSR_EFER, %ecx 152 wrmsr 1532: movl wakeup_cr4 - wakeup_start(%ebx), %eax 154 cmpl $0, %eax 155 je 3f 156 mov %eax, %cr4 1573: movl wakeup_cr3 - wakeup_start(%ebx), %eax 158 mov %eax, %cr3 159 160 /* Get PCB and return address. */ 161 movl wakeup_ret - wakeup_start(%ebx), %edx 162 movl wakeup_pcb - wakeup_start(%ebx), %ecx 163 164 /* Enable paging. */ 165 mov %cr0, %eax 166 orl $CR0_PG, %eax 167 mov %eax, %cr0 168 169 /* Jump to return address. */ 170 jmp *%edx 171 172 .data 173 174resume_beep: 175 .byte 0 176reset_video: 177 .byte 0 178 179 ALIGN_DATA 180bootgdt: 181 .long 0x00000000 182 .long 0x00000000 183 184bootcode32: 185 .long 0x0000ffff 186 .long 0x00cf9b00 187 188bootdata32: 189 .long 0x0000ffff 190 .long 0x00cf9300 191bootgdtend: 192 193bootgdtdesc: 194 .word bootgdtend - bootgdt /* Length */ 195 .long bootgdt - wakeup_start /* Offset plus %ds << 4 */ 196 197 ALIGN_DATA 198wakeup_efer: 199 .long 0 200 .long 0 201wakeup_cr4: 202 .long 0 203wakeup_cr3: 204 .long 0 205wakeup_pcb: 206 .long 0 207wakeup_ret: 208 .long 0 209wakeup_gdt: /* not used */ 210 .word 0 211 .long 0 212dummy: 213