Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/acpica/acpi_wakecode.S
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1 /*- 2 * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> 3 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> 4 * Copyright (c) 2003 Peter Wemm 5 * Copyright (c) 2008-2010 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 * $FreeBSD: releng/8.4/sys/amd64/acpica/acpi_wakecode.S 237009 2012-06-13 15:25:52Z jhb $ 30 */ 31 32 #include <machine/asmacros.h> 33 #include <machine/specialreg.h> 34 35 #include "assym.s" 36 37 /* 38 * Resume entry point for real mode. 39 * 40 * If XFirmwareWakingVector is zero and FirmwareWakingVector is non-zero 41 * in FACS, the BIOS enters here in real mode after POST with CS set to 42 * (FirmwareWakingVector >> 4) and IP set to (FirmwareWakingVector & 0xf). 43 * Depending on the previous sleep state, we may need to initialize more 44 * of the system (i.e., S3 suspend-to-RAM vs. S4 suspend-to-disk). 45 * 46 * Note: If XFirmwareWakingVector is non-zero, it should disable address 47 * translation/paging and interrupts, load all segment registers with 48 * a flat 4 GB address space, and set EFLAGS.IF to zero. Currently 49 * this mode is not supported by this code. 50 */ 51 52 .data /* So we can modify it */ 53 54 ALIGN_TEXT 55 .code16 56 wakeup_start: 57 /* 58 * Set up segment registers for real mode, a small stack for 59 * any calls we make, and clear any flags. 60 */ 61 cli /* make sure no interrupts */ 62 mov %cs, %ax /* copy %cs to %ds. Remember these */ 63 mov %ax, %ds /* are offsets rather than selectors */ 64 mov %ax, %ss 65 movw $PAGE_SIZE, %sp 66 xorw %ax, %ax 67 pushw %ax 68 popfw 69 70 /* To debug resume hangs, beep the speaker if the user requested. */ 71 testb $~0, resume_beep - wakeup_start 72 jz 1f 73 movb $0, resume_beep - wakeup_start 74 movb $0xc0, %al 75 outb %al, $0x42 76 movb $0x04, %al 77 outb %al, $0x42 78 inb $0x61, %al 79 orb $0x3, %al 80 outb %al, $0x61 81 1: 82 83 /* Re-initialize video BIOS if the reset_video tunable is set. */ 84 testb $~0, reset_video - wakeup_start 85 jz 1f 86 movb $0, reset_video - wakeup_start 87 lcall $0xc000, $3 88 89 /* When we reach here, int 0x10 should be ready. Hide cursor. */ 90 movb $0x01, %ah 91 movb $0x20, %ch 92 int $0x10 93 94 /* Re-start in case the previous BIOS call clobbers them. */ 95 jmp wakeup_start 96 1: 97 98 /* 99 * Find relocation base and patch the gdt descript and ljmp targets 100 */ 101 xorl %ebx, %ebx 102 mov %cs, %bx 103 sall $4, %ebx /* %ebx is now our relocation base */ 104 105 /* 106 * Load the descriptor table pointer. We'll need it when running 107 * in 16-bit protected mode. 108 */ 109 lgdtl bootgdtdesc - wakeup_start 110 111 /* Enable protected mode */ 112 movl $CR0_PE, %eax 113 mov %eax, %cr0 114 115 /* 116 * Now execute a far jump to turn on protected mode. This 117 * causes the segment registers to turn into selectors and causes 118 * %cs to be loaded from the gdt. 119 * 120 * The following instruction is: 121 * ljmpl $bootcode32 - bootgdt, $wakeup_32 - wakeup_start 122 * but gas cannot assemble that. And besides, we patch the targets 123 * in early startup and its a little clearer what we are patching. 124 */ 125 wakeup_sw32: 126 .byte 0x66 /* size override to 32 bits */ 127 .byte 0xea /* opcode for far jump */ 128 .long wakeup_32 - wakeup_start /* offset in segment */ 129 .word bootcode32 - bootgdt /* index in gdt for 32 bit code */ 130 131 /* 132 * At this point, we are running in 32 bit legacy protected mode. 133 */ 134 ALIGN_TEXT 135 .code32 136 wakeup_32: 137 138 mov $bootdata32 - bootgdt, %eax 139 mov %ax, %ds 140 141 /* Turn on the PAE and PSE bits for when paging is enabled */ 142 mov %cr4, %eax 143 orl $(CR4_PAE | CR4_PSE), %eax 144 mov %eax, %cr4 145 146 /* 147 * Enable EFER.LME so that we get long mode when all the prereqs are 148 * in place. In this case, it turns on when CR0_PG is finally enabled. 149 * Pick up a few other EFER bits that we'll use need we're here. 150 */ 151 movl $MSR_EFER, %ecx 152 rdmsr 153 orl $EFER_LME | EFER_SCE, %eax 154 wrmsr 155 156 /* 157 * Point to the embedded page tables for startup. Note that this 158 * only gets accessed after we're actually in 64 bit mode, however 159 * we can only set the bottom 32 bits of %cr3 in this state. This 160 * means we are required to use a temporary page table that is below 161 * the 4GB limit. %ebx is still our relocation base. We could just 162 * subtract 3 * PAGE_SIZE, but that would be too easy. 163 */ 164 leal wakeup_pagetables - wakeup_start(%ebx), %eax 165 movl (%eax), %eax 166 mov %eax, %cr3 167 168 /* 169 * Finally, switch to long bit mode by enabling paging. We have 170 * to be very careful here because all the segmentation disappears 171 * out from underneath us. The spec says we can depend on the 172 * subsequent pipelined branch to execute, but *only if* everthing 173 * is still identity mapped. If any mappings change, the pipeline 174 * will flush. 175 */ 176 mov %cr0, %eax 177 orl $CR0_PG, %eax 178 mov %eax, %cr0 179 180 /* 181 * At this point paging is enabled, and we are in "compatability" mode. 182 * We do another far jump to reload %cs with the 64 bit selector. 183 * %cr3 points to a 4-level page table page. 184 * We cannot yet jump all the way to the kernel because we can only 185 * specify a 32 bit linear address. So, yet another trampoline. 186 * 187 * The following instruction is: 188 * ljmp $bootcode64 - bootgdt, $wakeup_64 - wakeup_start 189 * but gas cannot assemble that. And besides, we patch the targets 190 * in early startup and its a little clearer what we are patching. 191 */ 192 wakeup_sw64: 193 .byte 0xea /* opcode for far jump */ 194 .long wakeup_64 - wakeup_start /* offset in segment */ 195 .word bootcode64 - bootgdt /* index in gdt for 64 bit code */ 196 197 /* 198 * Yeehar! We're running in 64-bit mode! We can mostly ignore our 199 * segment registers, and get on with it. 200 * Note that we are running at the correct virtual address, but with 201 * a 1:1 1GB mirrored mapping over entire address space. We had better 202 * switch to a real %cr3 promptly so that we can get to the direct map 203 * space. Remember that jmp is relative and that we've been relocated, 204 * so use an indirect jump. 205 */ 206 ALIGN_TEXT 207 .code64 208 wakeup_64: 209 mov $bootdata64 - bootgdt, %eax 210 mov %ax, %ds 211 212 /* Restore arguments and return. */ 213 movq wakeup_kpml4 - wakeup_start(%rbx), %rdi 214 movq wakeup_ctx - wakeup_start(%rbx), %rsi 215 movq wakeup_retaddr - wakeup_start(%rbx), %rax 216 jmp *%rax 217 218 .data 219 220 resume_beep: 221 .byte 0 222 reset_video: 223 .byte 0 224 225 ALIGN_DATA 226 bootgdt: 227 .long 0x00000000 228 .long 0x00000000 229 .long 0x00000000 230 .long 0x00000000 231 .long 0x00000000 232 .long 0x00000000 233 .long 0x00000000 234 .long 0x00000000 235 236 bootcode64: 237 .long 0x0000ffff 238 .long 0x00af9b00 239 240 bootdata64: 241 .long 0x0000ffff 242 .long 0x00af9300 243 244 bootcode32: 245 .long 0x0000ffff 246 .long 0x00cf9b00 247 248 bootdata32: 249 .long 0x0000ffff 250 .long 0x00cf9300 251 bootgdtend: 252 253 wakeup_pagetables: 254 .long 0 255 256 bootgdtdesc: 257 .word bootgdtend - bootgdt /* Length */ 258 .long bootgdt - wakeup_start /* Offset plus %ds << 4 */ 259 260 ALIGN_DATA 261 wakeup_retaddr: 262 .quad 0 263 wakeup_kpml4: 264 .quad 0 265 266 wakeup_ctx: 267 .quad 0 268 wakeup_pcb: 269 .quad 0 270 wakeup_gdt: 271 .word 0 272 .quad 0 273 wakeup_fpusave: 274 .quad 0 275 276 ALIGN_DATA 277 wakeup_efer: 278 .quad 0 279 wakeup_star: 280 .quad 0 281 wakeup_lstar: 282 .quad 0 283 wakeup_cstar: 284 .quad 0 285 wakeup_sfmask: 286 .quad 0 287 wakeup_cpu: 288 .long 0 289 dummy:
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