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  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/9.0/sys/i386/acpica/acpi_wakecode.S 215200 2010-11-12 20:55:14Z jkim $
   28  */
   29 
   30 #include <machine/asmacros.h>
   31 #include <machine/specialreg.h>
   32 
   33 #include "assym.s"
   34 
   35 /*
   36  * Resume entry point.  The BIOS enters here in real mode after POST with
   37  * CS set to the page where we stored this code.  It should configure the
   38  * segment registers with a flat 4 GB address space and EFLAGS.IF = 0.
   39  * Depending on the previous sleep state, we may need to initialize more
   40  * of the system (i.e., S3 suspend-to-RAM vs. S4 suspend-to-disk).
   41  */
   42         .align 4
   43         .code16
   44 wakeup_16:
   45         nop
   46         cli
   47         cld
   48 
   49         /*
   50          * Set up segment registers for real mode, a small stack for
   51          * any calls we make, and clear any flags.
   52          */
   53         movw    %cs,%ax
   54         movw    %ax,%ds
   55         movw    %ax,%ss
   56         movw    $PAGE_SIZE,%sp
   57         pushl   $0
   58         popfl
   59 
   60         /* To debug resume hangs, beep the speaker if the user requested. */
   61         cmpl    $1,resume_beep
   62         jne     nobeep
   63         movb    $0xc0,%al
   64         outb    %al,$0x42
   65         movb    $0x04,%al
   66         outb    %al,$0x42
   67         inb     $0x61,%al
   68         orb     $0x3,%al
   69         outb    %al,$0x61
   70 nobeep:
   71 
   72         /* Re-initialize video BIOS if the reset_video tunable is set. */
   73         cmpl    $1,reset_video
   74         jne     nobiosreset
   75         lcall   $0xc000,$3
   76 
   77         /*
   78          * Set up segment registers for real mode again in case the
   79          * previous BIOS call clobbers them.
   80          */
   81         movw    %cs,%ax
   82         movw    %ax,%ds
   83         movw    %ax,%ss
   84 nobiosreset:
   85 
   86         /* Load GDT for real mode.  Use 32 bit prefix for addresses >16 MB. */
   87         lgdtl   physical_gdt
   88 
   89         /* Restore CR2, CR3 and CR4 */
   90         movl    previous_cr2,%eax
   91         movl    %eax,%cr2
   92         movl    previous_cr3,%eax
   93         movl    %eax,%cr3
   94         movl    previous_cr4,%eax
   95         movl    %eax,%cr4
   96 
   97         /* Transfer some values to protected mode with an inline stack */
   98 #define NVALUES 9
   99 #define TRANSFER_STACK32(val, idx)      \
  100         movl    val,%eax;               \
  101         movl    %eax,wakeup_32stack+(idx+1)+(idx*4)
  102 
  103         TRANSFER_STACK32(previous_ss,           (NVALUES - 9))
  104         TRANSFER_STACK32(previous_fs,           (NVALUES - 8))
  105         TRANSFER_STACK32(previous_ds,           (NVALUES - 7))
  106         TRANSFER_STACK32(physical_gdt+2,        (NVALUES - 6))
  107         TRANSFER_STACK32(where_to_recover,      (NVALUES - 5))
  108         TRANSFER_STACK32(previous_idt+2,        (NVALUES - 4))
  109         TRANSFER_STACK32(previous_ldt,          (NVALUES - 3))
  110         TRANSFER_STACK32(previous_gdt+2,        (NVALUES - 2))
  111         TRANSFER_STACK32(previous_tr,           (NVALUES - 1))
  112         TRANSFER_STACK32(previous_cr0,          (NVALUES - 0))
  113 
  114         mov     physical_esp,%esi       /* to be used in 32bit code */
  115 
  116         /* Enable protected mode */
  117         movl    %cr0,%eax
  118         orl     $(CR0_PE),%eax
  119         movl    %eax,%cr0
  120 
  121 wakeup_sw32:
  122         /* Switch to protected mode by intersegmental jump */
  123         ljmpl   $KCSEL,$0x12345678      /* Code location, to be replaced */
  124 
  125         /*
  126          * Now switched to protected mode without paging enabled.
  127          *      %esi: KERNEL stack pointer (physical address)
  128          */
  129         .code32
  130 wakeup_32:
  131         nop
  132 
  133         /* Set up segment registers for protected mode */
  134         movw    $KDSEL,%ax              /* KDSEL to segment registers */
  135         movw    %ax,%ds
  136         movw    %ax,%es
  137         movw    %ax,%gs
  138         movw    %ax,%ss
  139         movw    $KPSEL,%ax              /* KPSEL to %fs */
  140         movw    %ax,%fs
  141         movl    %esi,%esp               /* physical address stack pointer */
  142 
  143 wakeup_32stack:
  144         /* Operands are overwritten in 16 bit code by TRANSFER_STACK32 macro */
  145         pushl   $0xabcdef09             /* ss + dummy */
  146         pushl   $0xabcdef08             /* fs + gs */
  147         pushl   $0xabcdef07             /* ds + es */
  148         pushl   $0xabcdef06             /* gdt:base (physical address) */
  149         pushl   $0xabcdef05             /* recover address */
  150         pushl   $0xabcdef04             /* idt:base */
  151         pushl   $0xabcdef03             /* ldt + idt:limit */
  152         pushl   $0xabcdef02             /* gdt:base */
  153         pushl   $0xabcdef01             /* TR + gdt:limit */
  154         pushl   $0xabcdef00             /* CR0 */
  155 
  156         movl    %esp,%ebp
  157 #define CR0_REGISTER            0(%ebp)
  158 #define TASK_REGISTER           4(%ebp)
  159 #define PREVIOUS_GDT            6(%ebp)
  160 #define PREVIOUS_LDT            12(%ebp)
  161 #define PREVIOUS_IDT            14(%ebp)
  162 #define RECOVER_ADDR            20(%ebp)
  163 #define PHYSICAL_GDT_BASE       24(%ebp)
  164 #define PREVIOUS_DS             28(%ebp)
  165 #define PREVIOUS_ES             30(%ebp)
  166 #define PREVIOUS_FS             32(%ebp)
  167 #define PREVIOUS_GS             34(%ebp)
  168 #define PREVIOUS_SS             36(%ebp)
  169 
  170         /* Fixup TSS type field */
  171 #define TSS_TYPEFIX_MASK        0xf9
  172         xorl    %esi,%esi
  173         movl    PHYSICAL_GDT_BASE,%ebx
  174         movw    TASK_REGISTER,%si
  175         leal    (%ebx,%esi),%eax        /* get TSS segment descriptor */
  176         andb    $TSS_TYPEFIX_MASK,5(%eax)
  177 
  178         /* Prepare to return to sleep/wakeup code point */
  179         lgdtl   PREVIOUS_GDT
  180         lidtl   PREVIOUS_IDT
  181 
  182         /* Pack values from the GDT to be loaded into segment registers. */
  183         movl    PREVIOUS_DS,%ebx
  184         movl    PREVIOUS_FS,%ecx
  185         movl    PREVIOUS_SS,%edx
  186         movw    TASK_REGISTER,%si
  187         shll    $16,%esi
  188         movw    PREVIOUS_LDT,%si
  189         movl    RECOVER_ADDR,%edi
  190 
  191         /* Enable paging and etc. */
  192         movl    CR0_REGISTER,%eax
  193         movl    %eax,%cr0
  194 
  195         /* Flush the prefetch queue */
  196         jmp     1f
  197 1:      jmp     1f
  198 1:
  199 
  200         /*
  201          * Now we are in kernel virtual memory addressing with the following
  202          * original register values:
  203          *      %ebx: ds + es
  204          *      %ecx: fs + gs
  205          *      %edx: ss + dummy
  206          *      %esi: LDTR + TR
  207          *      %edi: recover address
  208          * We'll load these back into the segment registers now.
  209          */
  210         nop
  211 
  212         movl    %esi,%eax               /* LDTR + TR */
  213         lldt    %ax                     /* load LDT register */
  214         shrl    $16,%eax
  215         ltr     %ax                     /* load task register */
  216 
  217         /* Restore segment registers */
  218         movl    %ebx,%eax               /* ds + es */
  219         movw    %ax,%ds
  220         shrl    $16,%eax
  221         movw    %ax,%es
  222         movl    %ecx,%eax               /* fs + gs */
  223         movw    %ax,%fs
  224         shrl    $16,%eax
  225         movw    %ax,%gs
  226         movl    %edx,%eax               /* ss */
  227         movw    %ax,%ss
  228 
  229         /* Jump to acpi_restorecpu() */
  230         jmp     *%edi
  231 
  232 /* used in real mode */
  233 physical_gdt:           .word 0
  234                         .long 0
  235 physical_esp:           .long 0
  236 previous_cr2:           .long 0
  237 previous_cr3:           .long 0
  238 previous_cr4:           .long 0
  239 resume_beep:            .long 0
  240 reset_video:            .long 0
  241 
  242 /*
  243  * Transfer from real mode to protected mode.  The order of these variables
  244  * is very important, DO NOT INSERT OR CHANGE unless you know why.
  245  */
  246 previous_cr0:           .long 0
  247 previous_tr:            .word 0
  248 previous_gdt:           .word 0
  249                         .long 0
  250 previous_ldt:           .word 0
  251 previous_idt:           .word 0
  252                         .long 0
  253 where_to_recover:       .long 0
  254 previous_ds:            .word 0
  255 previous_es:            .word 0
  256 previous_fs:            .word 0
  257 previous_gs:            .word 0
  258 previous_ss:            .word 0
  259 dummy:                  .word 0

Cache object: 21958e8e3e595481cb5ddcd2d14071f7

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FreeBSD/Linux Kernel Cross Reference sys/i386/acpica/acpi_wakecode.S

FreeBSD/Linux Kernel Cross Reference
sys/i386/acpica/acpi_wakecode.S