The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/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  * 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/5.0/sys/i386/acpica/acpi_wakecode.S 80028 2001-07-20 06:07:34Z takawata $
   28  */
   29 
   30 #define LOCORE
   31 
   32 #include <machine/specialreg.h>
   33 
   34         .align 4
   35         .code16
   36 wakeup_16:
   37         nop
   38         cli
   39 
   40         /* Set up segment registers for real mode */
   41         movw    %cs,%ax
   42         movw    %ax,%ds
   43         movw    %ax,%ss
   44 
   45         /* Load GDT for real mode */
   46         lgdt    physical_gdt
   47 
   48         /* Restore CR2, CR3 and CR4 */
   49         mov     previous_cr2,%eax
   50         mov     %eax,%cr2
   51         mov     previous_cr3,%eax
   52         mov     %eax,%cr3
   53         mov     previous_cr4,%eax
   54         mov     %eax,%cr4
   55 
   56         /* Transfer some values to protected mode */
   57 #define NVALUES 9
   58 #define TRANSFER_STACK32(val, idx)      \
   59         mov     val,%eax;               \
   60         mov     %eax,wakeup_32stack+(idx+1)+(idx*4);
   61 
   62         TRANSFER_STACK32(previous_ss,           (NVALUES - 9))
   63         TRANSFER_STACK32(previous_fs,           (NVALUES - 8))
   64         TRANSFER_STACK32(previous_ds,           (NVALUES - 7))
   65         TRANSFER_STACK32(physical_gdt+2,        (NVALUES - 6))
   66         TRANSFER_STACK32(where_to_recover,      (NVALUES - 5))
   67         TRANSFER_STACK32(previous_idt+2,        (NVALUES - 4))
   68         TRANSFER_STACK32(previous_ldt,          (NVALUES - 3))
   69         TRANSFER_STACK32(previous_gdt+2,        (NVALUES - 2))
   70         TRANSFER_STACK32(previous_tr,           (NVALUES - 1))
   71         TRANSFER_STACK32(previous_cr0,          (NVALUES - 0))
   72 
   73         mov     physical_esp,%esi       /* to be used in 32bit code */
   74 
   75         /* Enable protected mode */
   76         mov     %cr0,%eax
   77         orl     $(CR0_PE),%eax
   78         mov     %eax,%cr0
   79 
   80 wakeup_sw32:
   81         /* Switch to protected mode by intersegmental jump */
   82         ljmpl   $0x8,$0x12345678        /* Code location, to be replaced */
   83 
   84         .code32
   85 wakeup_32:
   86         /*
   87          * Switched to protected mode w/o paging
   88          *      %esi:   KERNEL stack pointer (physical address)
   89          */
   90 
   91         nop
   92 
   93         /* Set up segment registers for protected mode */
   94         movw    $0x10,%ax               /* KDSEL to segment registers */
   95         movw    %ax,%ds
   96         movw    %ax,%es
   97         movw    %ax,%gs
   98         movw    %ax,%ss
   99         movw    $0x18,%ax               /* KPSEL to %fs */
  100         movw    %ax,%fs
  101         movl    %esi,%esp               /* physical address stack pointer */
  102 
  103 wakeup_32stack:
  104         /* Operands are overwritten in 16bit code */
  105         pushl   $0xabcdef09             /* ss + dummy */
  106         pushl   $0xabcdef08             /* fs + gs */
  107         pushl   $0xabcdef07             /* ds + es */
  108         pushl   $0xabcdef06             /* gdt:base (physical address) */
  109         pushl   $0xabcdef05             /* recover address */ 
  110         pushl   $0xabcdef04             /* idt:base */ 
  111         pushl   $0xabcdef03             /* ldt + idt:limit */
  112         pushl   $0xabcdef02             /* gdt:base */
  113         pushl   $0xabcdef01             /* TR + gdt:limit */
  114         pushl   $0xabcdef00             /* CR0 */
  115 
  116         movl    %esp,%ebp
  117 #define CR0_REGISTER            0(%ebp)
  118 #define TASK_REGISTER           4(%ebp)
  119 #define PREVIOUS_GDT            6(%ebp)
  120 #define PREVIOUS_LDT            12(%ebp)
  121 #define PREVIOUS_IDT            14(%ebp)
  122 #define RECOVER_ADDR            20(%ebp)
  123 #define PHYSICAL_GDT_BASE       24(%ebp)
  124 #define PREVIOUS_DS             28(%ebp)
  125 #define PREVIOUS_ES             30(%ebp)
  126 #define PREVIOUS_FS             32(%ebp)
  127 #define PREVIOUS_GS             34(%ebp)
  128 #define PREVIOUS_SS             36(%ebp)
  129 
  130         /* Fixup TSS type field */
  131 #define TSS_TYPEFIX_MASK        0xf9
  132         xorl    %esi,%esi
  133         movl    PHYSICAL_GDT_BASE,%ebx
  134         movw    TASK_REGISTER,%si
  135         leal    (%ebx,%esi),%eax        /* get TSS segment descriptor */
  136         andb    $TSS_TYPEFIX_MASK,5(%eax)
  137 
  138         /* Prepare to return to sleep/wakeup code point */
  139         lgdt    PREVIOUS_GDT
  140         lidt    PREVIOUS_IDT
  141 
  142         xorl    %eax,%eax
  143         movl    %eax,%ebx
  144         movl    %eax,%ecx
  145         movl    %eax,%edx
  146         movl    %eax,%esi
  147         movl    %eax,%edi
  148         movl    PREVIOUS_DS,%ebx
  149         movl    PREVIOUS_FS,%ecx
  150         movl    PREVIOUS_SS,%edx
  151         movw    TASK_REGISTER,%si
  152         shll    $16,%esi
  153         movw    PREVIOUS_LDT,%si
  154         movl    RECOVER_ADDR,%edi
  155 
  156         /* Enable paging and etc. */
  157         movl    CR0_REGISTER,%eax
  158         movl    %eax,%cr0
  159 
  160         /* Flush the prefetch queue */
  161         jmp     1f
  162 1:      jmp     1f
  163 1:
  164         /*
  165          * Now that we are in kernel virtual memory addressing
  166          *      %ebx:   ds + es
  167          *      %ecx:   fs + gs
  168          *      %edx:   ss + dummy
  169          *      %esi:   LDTR + TR
  170          *      %edi:   recover address
  171          */
  172 
  173         nop
  174 
  175         movl    %esi,%eax               /* LDTR + TR */
  176         lldt    %ax                     /* load LDT register */
  177         shrl    $16,%eax
  178         ltr     %ax                     /* load task register */
  179 
  180         /* Restore segment registers */
  181         movl    %ebx,%eax               /* ds + es */
  182         movw    %ax,%ds
  183         shrl    $16,%eax
  184         movw    %ax,%es
  185         movl    %ecx,%eax               /* fs + gs */
  186         movw    %ax,%fs
  187         shrl    $16,%eax
  188         movw    %ax,%gs
  189         movl    %edx,%eax               /* ss */
  190         movw    %ax,%ss
  191 
  192         /* Jump to acpi_restorecpu() */
  193         jmp     *%edi
  194 
  195 /* used in real mode */
  196 physical_gdt:           .word 0
  197                         .long 0
  198 physical_esp:           .long 0
  199 previous_cr2:           .long 0
  200 previous_cr3:           .long 0
  201 previous_cr4:           .long 0
  202 
  203 /* transfer from real mode to protected mode */
  204 previous_cr0:           .long 0
  205 previous_tr:            .word 0
  206 previous_gdt:           .word 0
  207                         .long 0
  208 previous_ldt:           .word 0
  209 previous_idt:           .word 0
  210                         .long 0
  211 where_to_recover:       .long 0
  212 previous_ds:            .word 0
  213 previous_es:            .word 0
  214 previous_fs:            .word 0
  215 previous_gs:            .word 0
  216 previous_ss:            .word 0
  217 dummy:                  .word 0
  218 

Cache object: 19970e7e5a6085ef60c4d4d442d2b8cd


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