acpi_wakecode.S

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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  * $FreeBSD$
   28  */
   29 
   30 #define LOCORE
   31 
   32 #include <machine/asmacros.h>
   33 #include <machine/param.h>
   34 #include <machine/specialreg.h>
   35 
   36         .align 4
   37         .code16
   38 wakeup_16:
   39         nop
   40         cli
   41 
   42         /*
   43          * Set up segment registers for real mode and a small stack for
   44          * any calls we make.
   45          */
   46         movw    %cs,%ax
   47         movw    %ax,%ds
   48         movw    %ax,%ss
   49         movw    $PAGE_SIZE,%sp
   50 
   51         /* Re-initialize video BIOS if the reset_video tunable is set. */
   52         cmp     $0,reset_video
   53         je      wakeup_16_gdt
   54         lcall   $0xc000,$3
   55 
   56         /*
   57          * Set up segment registers for real mode again in case the
   58          * previous BIOS call clobbers them.
   59          */
   60         movw    %cs,%ax
   61         movw    %ax,%ds
   62         movw    %ax,%ss
   63 
   64 wakeup_16_gdt:
   65         /* Load GDT for real mode */
   66         lgdt    physical_gdt
   67 
   68         /* Restore CR2, CR3 and CR4 */
   69         mov     previous_cr2,%eax
   70         mov     %eax,%cr2
   71         mov     previous_cr3,%eax
   72         mov     %eax,%cr3
   73         mov     previous_cr4,%eax
   74         mov     %eax,%cr4
   75 
   76         /* Transfer some values to protected mode */
   77 #define NVALUES 9
   78 #define TRANSFER_STACK32(val, idx)      \
   79         mov     val,%eax;               \
   80         mov     %eax,wakeup_32stack+(idx+1)+(idx*4);
   81 
   82         TRANSFER_STACK32(previous_ss,           (NVALUES - 9))
   83         TRANSFER_STACK32(previous_fs,           (NVALUES - 8))
   84         TRANSFER_STACK32(previous_ds,           (NVALUES - 7))
   85         TRANSFER_STACK32(physical_gdt+2,        (NVALUES - 6))
   86         TRANSFER_STACK32(where_to_recover,      (NVALUES - 5))
   87         TRANSFER_STACK32(previous_idt+2,        (NVALUES - 4))
   88         TRANSFER_STACK32(previous_ldt,          (NVALUES - 3))
   89         TRANSFER_STACK32(previous_gdt+2,        (NVALUES - 2))
   90         TRANSFER_STACK32(previous_tr,           (NVALUES - 1))
   91         TRANSFER_STACK32(previous_cr0,          (NVALUES - 0))
   92 
   93         mov     physical_esp,%esi       /* to be used in 32bit code */
   94 
   95         /* Enable protected mode */
   96         mov     %cr0,%eax
   97         orl     $(CR0_PE),%eax
   98         mov     %eax,%cr0
   99 
  100 wakeup_sw32:
  101         /* Switch to protected mode by intersegmental jump */
  102         ljmpl   $0x8,$0x12345678        /* Code location, to be replaced */
  103 
  104         .code32
  105 wakeup_32:
  106         /*
  107          * Switched to protected mode w/o paging
  108          *      %esi:   KERNEL stack pointer (physical address)
  109          */
  110 
  111         nop
  112 
  113         /* Set up segment registers for protected mode */
  114         movw    $0x10,%ax               /* KDSEL to segment registers */
  115         movw    %ax,%ds
  116         movw    %ax,%es
  117         movw    %ax,%gs
  118         movw    %ax,%ss
  119         movw    $0x18,%ax               /* KPSEL to %fs */
  120         movw    %ax,%fs
  121         movl    %esi,%esp               /* physical address stack pointer */
  122 
  123 wakeup_32stack:
  124         /* Operands are overwritten in 16bit code */
  125         pushl   $0xabcdef09             /* ss + dummy */
  126         pushl   $0xabcdef08             /* fs + gs */
  127         pushl   $0xabcdef07             /* ds + es */
  128         pushl   $0xabcdef06             /* gdt:base (physical address) */
  129         pushl   $0xabcdef05             /* recover address */ 
  130         pushl   $0xabcdef04             /* idt:base */ 
  131         pushl   $0xabcdef03             /* ldt + idt:limit */
  132         pushl   $0xabcdef02             /* gdt:base */
  133         pushl   $0xabcdef01             /* TR + gdt:limit */
  134         pushl   $0xabcdef00             /* CR0 */
  135 
  136         movl    %esp,%ebp
  137 #define CR0_REGISTER            0(%ebp)
  138 #define TASK_REGISTER           4(%ebp)
  139 #define PREVIOUS_GDT            6(%ebp)
  140 #define PREVIOUS_LDT            12(%ebp)
  141 #define PREVIOUS_IDT            14(%ebp)
  142 #define RECOVER_ADDR            20(%ebp)
  143 #define PHYSICAL_GDT_BASE       24(%ebp)
  144 #define PREVIOUS_DS             28(%ebp)
  145 #define PREVIOUS_ES             30(%ebp)
  146 #define PREVIOUS_FS             32(%ebp)
  147 #define PREVIOUS_GS             34(%ebp)
  148 #define PREVIOUS_SS             36(%ebp)
  149 
  150         /* Fixup TSS type field */
  151 #define TSS_TYPEFIX_MASK        0xf9
  152         xorl    %esi,%esi
  153         movl    PHYSICAL_GDT_BASE,%ebx
  154         movw    TASK_REGISTER,%si
  155         leal    (%ebx,%esi),%eax        /* get TSS segment descriptor */
  156         andb    $TSS_TYPEFIX_MASK,5(%eax)
  157 
  158         /* Prepare to return to sleep/wakeup code point */
  159         lgdt    PREVIOUS_GDT
  160         lidt    PREVIOUS_IDT
  161 
  162         xorl    %eax,%eax
  163         movl    %eax,%ebx
  164         movl    %eax,%ecx
  165         movl    %eax,%edx
  166         movl    %eax,%esi
  167         movl    %eax,%edi
  168         movl    PREVIOUS_DS,%ebx
  169         movl    PREVIOUS_FS,%ecx
  170         movl    PREVIOUS_SS,%edx
  171         movw    TASK_REGISTER,%si
  172         shll    $16,%esi
  173         movw    PREVIOUS_LDT,%si
  174         movl    RECOVER_ADDR,%edi
  175 
  176         /* Enable paging and etc. */
  177         movl    CR0_REGISTER,%eax
  178         movl    %eax,%cr0
  179 
  180         /* Flush the prefetch queue */
  181         jmp     1f
  182 1:      jmp     1f
  183 1:
  184         /*
  185          * Now that we are in kernel virtual memory addressing
  186          *      %ebx:   ds + es
  187          *      %ecx:   fs + gs
  188          *      %edx:   ss + dummy
  189          *      %esi:   LDTR + TR
  190          *      %edi:   recover address
  191          */
  192 
  193         nop
  194 
  195         movl    %esi,%eax               /* LDTR + TR */
  196         lldt    %ax                     /* load LDT register */
  197         shrl    $16,%eax
  198         ltr     %ax                     /* load task register */
  199 
  200         /* Restore segment registers */
  201         movl    %ebx,%eax               /* ds + es */
  202         movw    %ax,%ds
  203         shrl    $16,%eax
  204         movw    %ax,%es
  205         movl    %ecx,%eax               /* fs + gs */
  206         movw    %ax,%fs
  207         shrl    $16,%eax
  208         movw    %ax,%gs
  209         movl    %edx,%eax               /* ss */
  210         movw    %ax,%ss
  211 
  212         /* Jump to acpi_restorecpu() */
  213         jmp     *%edi
  214 
  215 /* used in real mode */
  216 physical_gdt:           .word 0
  217                         .long 0
  218 physical_esp:           .long 0
  219 previous_cr2:           .long 0
  220 previous_cr3:           .long 0
  221 previous_cr4:           .long 0
  222 reset_video:            .long 0
  223 
  224 /* transfer from real mode to protected mode */
  225 previous_cr0:           .long 0
  226 previous_tr:            .word 0
  227 previous_gdt:           .word 0
  228                         .long 0
  229 previous_ldt:           .word 0
  230 previous_idt:           .word 0
  231                         .long 0
  232 where_to_recover:       .long 0
  233 previous_ds:            .word 0
  234 previous_es:            .word 0
  235 previous_fs:            .word 0
  236 previous_gs:            .word 0
  237 previous_ss:            .word 0
  238 dummy:                  .word 0

Cache object: 2477a2e63fc90201aafe7cb782e70c48

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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