arch/x86_64/kernel/acpi/wakeup.S

   1 .text
   2 #include <linux/linkage.h>
   3 #include <asm/segment.h>
   4 #include <asm/page.h>
   5 #include <asm/msr.h>
   6
   7 # Copyright 2003 Pavel Machek <pavel@suse.cz>, distribute under GPLv2
   8 #
   9 # wakeup_code runs in real mode, and at unknown address (determined at run-time).
  10 # Therefore it must only use relative jumps/calls.
  11 #
  12 # Do we need to deal with A20? It is okay: ACPI specs says A20 must be enabled
  13 #
  14 # If physical address of wakeup_code is 0x12345, BIOS should call us with
  15 # cs = 0x1234, eip = 0x05
  16 #
  17
  18
  19 ALIGN
  20         .align  16
  21 ENTRY(wakeup_start)
  22 wakeup_code:
  23         wakeup_code_start = .
  24         .code16
  25
  26 # Running in *copy* of this code, somewhere in low 1MB.
  27
  28         movb    $0xa1, %al      ;  outb %al, $0x80
  29         cli
  30         cld
  31         # setup data segment
  32         movw    %cs, %ax
  33         movw    %ax, %ds                                        # Make ds:0 point to wakeup_start
  34         movw    %ax, %ss
  35         mov     $(wakeup_stack - wakeup_code), %sp              # Private stack is needed for ASUS board
  36
  37         pushl   $0                                              # Kill any dangerous flags
  38         popfl
  39
  40         movl    real_magic - wakeup_code, %eax
  41         cmpl    $0x12345678, %eax
  42         jne     bogus_real_magic
  43
  44         testl   $1, video_flags - wakeup_code
  45         jz      1f
  46         lcall   $0xc000,$3
  47         movw    %cs, %ax
  48         movw    %ax, %ds                                        # Bios might have played with that
  49         movw    %ax, %ss
  50 1:
  51
  52         testl   $2, video_flags - wakeup_code
  53         jz      1f
  54         mov     video_mode - wakeup_code, %ax
  55         call    mode_seta
  56 1:
  57
  58         movw    $0xb800, %ax
  59         movw    %ax,%fs
  60         movw    $0x0e00 + 'L', %fs:(0x10)
  61
  62         movb    $0xa2, %al      ;  outb %al, $0x80
  63
  64         lidt    %ds:idt_48a - wakeup_code
  65         xorl    %eax, %eax
  66         movw    %ds, %ax                        # (Convert %ds:gdt to a linear ptr)
  67         shll    $4, %eax
  68         addl    $(gdta - wakeup_code), %eax
  69         movl    %eax, gdt_48a +2 - wakeup_code
  70         lgdt    %ds:gdt_48a - wakeup_code               # load gdt with whatever is
  71                                                 # appropriate
  72
  73         movl    $1, %eax                        # protected mode (PE) bit
  74         lmsw    %ax                             # This is it!
  75         jmp     1f
  76 1:
  77
  78         .byte 0x66, 0xea                        # prefix + jmpi-opcode
  79         .long   wakeup_32 - __START_KERNEL_map
  80         .word   __KERNEL_CS
  81
  82         .code32
  83 wakeup_32:
  84 # Running in this code, but at low address; paging is not yet turned on.
  85         movb    $0xa5, %al      ;  outb %al, $0x80
  86
  87         /* Check if extended functions are implemented */
  88         movl    $0x80000000, %eax
  89         cpuid
  90         cmpl    $0x80000000, %eax
  91         jbe     bogus_cpu
  92         wbinvd
  93         mov     $0x80000001, %eax
  94         cpuid
  95         btl     $29, %edx
  96         jnc     bogus_cpu
  97         movl    %edx,%edi
  98
  99         movw    $__KERNEL_DS, %ax
 100         movw    %ax, %ds
 101         movw    %ax, %es
 102         movw    %ax, %fs
 103         movw    %ax, %gs
 104
 105         movw    $__KERNEL_DS, %ax
 106         movw    %ax, %ss
 107
 108         mov     $(wakeup_stack - __START_KERNEL_map), %esp
 109         movl    saved_magic - __START_KERNEL_map, %eax
 110         cmpl    $0x9abcdef0, %eax
 111         jne     bogus_32_magic
 112
 113         /*
 114          * Prepare for entering 64bits mode
 115          */
 116
 117         /* Enable PAE mode and PGE */
 118         xorl    %eax, %eax
 119         btsl    $5, %eax
 120         btsl    $7, %eax
 121         movl    %eax, %cr4
 122
 123         /* Setup early boot stage 4 level pagetables */
 124         movl    $(wakeup_level4_pgt - __START_KERNEL_map), %eax
 125         movl    %eax, %cr3
 126
 127         /* Setup EFER (Extended Feature Enable Register) */
 128         movl    $MSR_EFER, %ecx
 129         rdmsr
 130         /* Fool rdmsr and reset %eax to avoid dependences */
 131         xorl    %eax, %eax
 132         /* Enable Long Mode */
 133         btsl    $_EFER_LME, %eax
 134         /* Enable System Call */
 135         btsl    $_EFER_SCE, %eax
 136
 137         /* No Execute supported? */
 138         btl     $20,%edi
 139         jnc     1f
 140         btsl    $_EFER_NX, %eax
 141 1:
 142
 143         /* Make changes effective */
 144         wrmsr
 145         wbinvd
 146
 147         xorl    %eax, %eax
 148         btsl    $31, %eax                       /* Enable paging and in turn activate Long Mode */
 149         btsl    $0, %eax                        /* Enable protected mode */
 150         btsl    $1, %eax                        /* Enable MP */
 151         btsl    $4, %eax                        /* Enable ET */
 152         btsl    $5, %eax                        /* Enable NE */
 153         btsl    $16, %eax                       /* Enable WP */
 154         btsl    $18, %eax                       /* Enable AM */
 155
 156         /* Make changes effective */
 157         movl    %eax, %cr0
 158         /* At this point:
 159                 CR4.PAE must be 1
 160                 CS.L must be 0
 161                 CR3 must point to PML4
 162                 Next instruction must be a branch
 163                 This must be on identity-mapped page
 164         */
 165         jmp     reach_compatibility_mode
 166 reach_compatibility_mode:
 167         movw    $0x0e00 + 'i', %ds:(0xb8012)
 168         movb    $0xa8, %al      ;  outb %al, $0x80;
 169
 170         /*
 171          * At this point we're in long mode but in 32bit compatibility mode
 172          * with EFER.LME = 1, CS.L = 0, CS.D = 1 (and in turn
 173          * EFER.LMA = 1). Now we want to jump in 64bit mode, to do that we load
 174          * the new gdt/idt that has __KERNEL_CS with CS.L = 1.
 175          */
 176
 177         movw    $0x0e00 + 'n', %ds:(0xb8014)
 178         movb    $0xa9, %al      ;  outb %al, $0x80
 179
 180         /* Load new GDT with the 64bit segment using 32bit descriptor */
 181         movl    $(pGDT32 - __START_KERNEL_map), %eax
 182         lgdt    (%eax)
 183
 184         movl    $(wakeup_jumpvector - __START_KERNEL_map), %eax
 185         /* Finally jump in 64bit mode */
 186         ljmp    *(%eax)
 187
 188 wakeup_jumpvector:
 189         .long   wakeup_long64 - __START_KERNEL_map
 190         .word   __KERNEL_CS
 191
 192 .code64
 193
 194         /*      Hooray, we are in Long 64-bit mode (but still running in low memory) */
 195 wakeup_long64:
 196         /*
 197          * We must switch to a new descriptor in kernel space for the GDT
 198          * because soon the kernel won't have access anymore to the userspace
 199          * addresses where we're currently running on. We have to do that here
 200          * because in 32bit we couldn't load a 64bit linear address.
 201          */
 202         lgdt    cpu_gdt_descr - __START_KERNEL_map
 203
 204         movw    $0x0e00 + 'u', %ds:(0xb8016)
 205
 206         nop
 207         nop
 208         movw    $__KERNEL_DS, %ax
 209         movw    %ax, %ss
 210         movw    %ax, %ds
 211         movw    %ax, %es
 212         movw    %ax, %fs
 213         movw    %ax, %gs
 214         movq    saved_esp, %rsp
 215
 216         movw    $0x0e00 + 'x', %ds:(0xb8018)
 217         movq    saved_ebx, %rbx
 218         movq    saved_edi, %rdi
 219         movq    saved_esi, %rsi
 220         movq    saved_ebp, %rbp
 221
 222         movw    $0x0e00 + '!', %ds:(0xb801a)
 223         movq    saved_eip, %rax
 224         jmp     *%rax
 225
 226 .code32
 227
 228         .align  64
 229 gdta:
 230         .word   0, 0, 0, 0                      # dummy
 231
 232         .word   0, 0, 0, 0                      # unused
 233
 234         .word   0xFFFF                          # 4Gb - (0x100000*0x1000 = 4Gb)
 235         .word   0                               # base address = 0
 236         .word   0x9B00                          # code read/exec. ??? Why I need 0x9B00 (as opposed to 0x9A00 in order for this to work?)
 237         .word   0x00CF                          # granularity = 4096, 386
 238                                                 #  (+5th nibble of limit)
 239
 240         .word   0xFFFF                          # 4Gb - (0x100000*0x1000 = 4Gb)
 241         .word   0                               # base address = 0
 242         .word   0x9200                          # data read/write
 243         .word   0x00CF                          # granularity = 4096, 386
 244                                                 #  (+5th nibble of limit)
 245 # this is 64bit descriptor for code
 246         .word   0xFFFF
 247         .word   0
 248         .word   0x9A00                          # code read/exec
 249         .word   0x00AF                          # as above, but it is long mode and with D=0
 250
 251 idt_48a:
 252         .word   0                               # idt limit = 0
 253         .word   0, 0                            # idt base = 0L
 254
 255 gdt_48a:
 256         .word   0x8000                          # gdt limit=2048,
 257                                                 #  256 GDT entries
 258         .word   0, 0                            # gdt base (filled in later)
 259
 260
 261 real_save_gdt:  .word 0
 262                 .quad 0
 263 real_magic:     .quad 0
 264 video_mode:     .quad 0
 265 video_flags:    .quad 0
 266
 267 bogus_real_magic:
 268         movb    $0xba,%al       ;  outb %al,$0x80
 269         jmp bogus_real_magic
 270
 271 bogus_32_magic:
 272         movb    $0xb3,%al       ;  outb %al,$0x80
 273         jmp bogus_32_magic
 274
 275 bogus_31_magic:
 276         movb    $0xb1,%al       ;  outb %al,$0x80
 277         jmp bogus_31_magic
 278
 279 bogus_cpu:
 280         movb    $0xbc,%al       ;  outb %al,$0x80
 281         jmp bogus_cpu
 282
 283
 284 /* This code uses an extended set of video mode numbers. These include:
 285  * Aliases for standard modes
 286  *      NORMAL_VGA (-1)
 287  *      EXTENDED_VGA (-2)
 288  *      ASK_VGA (-3)
 289  * Video modes numbered by menu position -- NOT RECOMMENDED because of lack
 290  * of compatibility when extending the table. These are between 0x00 and 0xff.
 291  */
 292 #define VIDEO_FIRST_MENU 0x0000
 293
 294 /* Standard BIOS video modes (BIOS number + 0x0100) */
 295 #define VIDEO_FIRST_BIOS 0x0100
 296
 297 /* VESA BIOS video modes (VESA number + 0x0200) */
 298 #define VIDEO_FIRST_VESA 0x0200
 299
 300 /* Video7 special modes (BIOS number + 0x0900) */
 301 #define VIDEO_FIRST_V7 0x0900
 302
 303 # Setting of user mode (AX=mode ID) => CF=success
 304 mode_seta:
 305         movw    %ax, %bx
 306 #if 0
 307         cmpb    $0xff, %ah
 308         jz      setalias
 309
 310         testb   $VIDEO_RECALC>>8, %ah
 311         jnz     _setrec
 312
 313         cmpb    $VIDEO_FIRST_RESOLUTION>>8, %ah
 314         jnc     setres
 315
 316         cmpb    $VIDEO_FIRST_SPECIAL>>8, %ah
 317         jz      setspc
 318
 319         cmpb    $VIDEO_FIRST_V7>>8, %ah
 320         jz      setv7
 321 #endif
 322
 323         cmpb    $VIDEO_FIRST_VESA>>8, %ah
 324         jnc     check_vesaa
 325 #if 0
 326         orb     %ah, %ah
 327         jz      setmenu
 328 #endif
 329
 330         decb    %ah
 331 #       jz      setbios                           Add bios modes later
 332
 333 setbada:        clc
 334         ret
 335
 336 check_vesaa:
 337         subb    $VIDEO_FIRST_VESA>>8, %bh
 338         orw     $0x4000, %bx                    # Use linear frame buffer
 339         movw    $0x4f02, %ax                    # VESA BIOS mode set call
 340         int     $0x10
 341         cmpw    $0x004f, %ax                    # AL=4f if implemented
 342         jnz     _setbada                                # AH=0 if OK
 343
 344         stc
 345         ret
 346
 347 _setbada: jmp setbada
 348
 349         .code64
 350 bogus_magic:
 351         movw    $0x0e00 + 'B', %ds:(0xb8018)
 352         jmp bogus_magic
 353
 354 bogus_magic2:
 355         movw    $0x0e00 + '2', %ds:(0xb8018)
 356         jmp bogus_magic2
 357
 358
 359 wakeup_stack_begin:     # Stack grows down
 360
 361 .org    0xff0
 362 wakeup_stack:           # Just below end of page
 363
 364 ENTRY(wakeup_end)
 365
 366 ##
 367 # acpi_copy_wakeup_routine
 368 #
 369 # Copy the above routine to low memory.
 370 #
 371 # Parameters:
 372 # %rdi: place to copy wakeup routine to
 373 #
 374 # Returned address is location of code in low memory (past data and stack)
 375 #
 376 ENTRY(acpi_copy_wakeup_routine)
 377         pushq   %rax
 378         pushq   %rcx
 379         pushq   %rdx
 380
 381         sgdt    saved_gdt
 382         sidt    saved_idt
 383         sldt    saved_ldt
 384         str     saved_tss
 385
 386         movq    %cr3, %rdx
 387         movq    %rdx, saved_cr3
 388         movq    %cr4, %rdx
 389         movq    %rdx, saved_cr4
 390         movq    %cr0, %rdx
 391         movq    %rdx, saved_cr0
 392         sgdt    real_save_gdt - wakeup_start (,%rdi)
 393         movl    $MSR_EFER, %ecx
 394         rdmsr
 395         movl    %eax, saved_efer
 396         movl    %edx, saved_efer2
 397
 398         movl    saved_video_mode, %edx
 399         movl    %edx, video_mode - wakeup_start (,%rdi)
 400         movl    acpi_video_flags, %edx
 401         movl    %edx, video_flags - wakeup_start (,%rdi)
 402         movq    $0x12345678, real_magic - wakeup_start (,%rdi)
 403         movq    $0x123456789abcdef0, %rdx
 404         movq    %rdx, saved_magic
 405
 406         movl    saved_magic - __START_KERNEL_map, %eax
 407         cmpl    $0x9abcdef0, %eax
 408         jne     bogus_32_magic
 409
 410         # make sure %cr4 is set correctly (features, etc)
 411         movl    saved_cr4 - __START_KERNEL_map, %eax
 412         movq    %rax, %cr4
 413
 414         movl    saved_cr0 - __START_KERNEL_map, %eax
 415         movq    %rax, %cr0
 416         jmp     1f              # Flush pipelines
 417 1:
 418         # restore the regs we used
 419         popq    %rdx
 420         popq    %rcx
 421         popq    %rax
 422 ENTRY(do_suspend_lowlevel_s4bios)
 423         ret
 424
 425         .align 2
 426         .p2align 4,,15
 427 .globl do_suspend_lowlevel
 428         .type   do_suspend_lowlevel,@function
 429 do_suspend_lowlevel:
 430 .LFB5:
 431         subq    $8, %rsp
 432         xorl    %eax, %eax
 433         call    save_processor_state
 434
 435         movq %rsp, saved_context_esp(%rip)
 436         movq %rax, saved_context_eax(%rip)
 437         movq %rbx, saved_context_ebx(%rip)
 438         movq %rcx, saved_context_ecx(%rip)
 439         movq %rdx, saved_context_edx(%rip)
 440         movq %rbp, saved_context_ebp(%rip)
 441         movq %rsi, saved_context_esi(%rip)
 442         movq %rdi, saved_context_edi(%rip)
 443         movq %r8,  saved_context_r08(%rip)
 444         movq %r9,  saved_context_r09(%rip)
 445         movq %r10, saved_context_r10(%rip)
 446         movq %r11, saved_context_r11(%rip)
 447         movq %r12, saved_context_r12(%rip)
 448         movq %r13, saved_context_r13(%rip)
 449         movq %r14, saved_context_r14(%rip)
 450         movq %r15, saved_context_r15(%rip)
 451         pushfq ; popq saved_context_eflags(%rip)
 452
 453         movq    $.L97, saved_eip(%rip)
 454
 455         movq %rsp,saved_esp
 456         movq %rbp,saved_ebp
 457         movq %rbx,saved_ebx
 458         movq %rdi,saved_edi
 459         movq %rsi,saved_esi
 460
 461         addq    $8, %rsp
 462         movl    $3, %edi
 463         xorl    %eax, %eax
 464         jmp     acpi_enter_sleep_state
 465 .L97:
 466         .p2align 4,,7
 467 .L99:
 468         .align 4
 469         movl    $24, %eax
 470         movw %ax, %ds
 471         movq    saved_context+58(%rip), %rax
 472         movq %rax, %cr4
 473         movq    saved_context+50(%rip), %rax
 474         movq %rax, %cr3
 475         movq    saved_context+42(%rip), %rax
 476         movq %rax, %cr2
 477         movq    saved_context+34(%rip), %rax
 478         movq %rax, %cr0
 479         pushq saved_context_eflags(%rip) ; popfq
 480         movq saved_context_esp(%rip), %rsp
 481         movq saved_context_ebp(%rip), %rbp
 482         movq saved_context_eax(%rip), %rax
 483         movq saved_context_ebx(%rip), %rbx
 484         movq saved_context_ecx(%rip), %rcx
 485         movq saved_context_edx(%rip), %rdx
 486         movq saved_context_esi(%rip), %rsi
 487         movq saved_context_edi(%rip), %rdi
 488         movq saved_context_r08(%rip), %r8
 489         movq saved_context_r09(%rip), %r9
 490         movq saved_context_r10(%rip), %r10
 491         movq saved_context_r11(%rip), %r11
 492         movq saved_context_r12(%rip), %r12
 493         movq saved_context_r13(%rip), %r13
 494         movq saved_context_r14(%rip), %r14
 495         movq saved_context_r15(%rip), %r15
 496
 497         xorl    %eax, %eax
 498         addq    $8, %rsp
 499         jmp     restore_processor_state
 500 .LFE5:
 501 .Lfe5:
 502         .size   do_suspend_lowlevel,.Lfe5-do_suspend_lowlevel
 503
 504 .data
 505 ALIGN
 506 ENTRY(saved_ebp)        .quad   0
 507 ENTRY(saved_esi)        .quad   0
 508 ENTRY(saved_edi)        .quad   0
 509 ENTRY(saved_ebx)        .quad   0
 510
 511 ENTRY(saved_eip)        .quad   0
 512 ENTRY(saved_esp)        .quad   0
 513
 514 ENTRY(saved_magic)      .quad   0
 515
 516 ALIGN
 517 # saved registers
 518 saved_gdt:      .quad   0,0
 519 saved_idt:      .quad   0,0
 520 saved_ldt:      .quad   0
 521 saved_tss:      .quad   0
 522
 523 saved_cr0:      .quad 0
 524 saved_cr3:      .quad 0
 525 saved_cr4:      .quad 0
 526 saved_efer:     .quad 0
 527 saved_efer2:    .quad 0