apm_setup.s

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    1 /*
    2  * Copyright (C) 1994 by HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
    3  * Copyright (C) 1997 by Poul-Henning Kamp <phk@FreeBSD.org>
    4  *
    5  * This software may be used, modified, copied, distributed, and sold,
    6  * in both source and binary form provided that the above copyright and
    7  * these terms are retained. Under no circumstances is the author 
    8  * responsible for the proper functioning of this software, nor does 
    9  * the author assume any responsibility for damages incurred with its 
   10  * use.
   11  *
   12  * Sep., 1994   Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
   13  *
   14  * $FreeBSD$
   15  */
   16 
   17 #include "apm.h"
   18   
   19 #if NAPM > 0
   20 
   21 #define ASSEMBLER
   22 #include "assym.s"                    /* system definitions */
   23 #include <machine/asmacros.h>         /* miscellaneous asm macros */
   24 #include <machine/apm_bios.h>
   25 #include <machine/apm_segments.h>
   26 #define PADDR(addr)        addr-KERNBASE
   27   
   28         .file   "apm_setup.s"
   29 
   30         .data
   31 _apm_init_image:
   32         .globl  _apm_init_image
   33 
   34 1:
   35 #include "i386/apm/apm_init/apm_init.inc"
   36 2:
   37 
   38 _apm_init_image_size:
   39         .globl  _apm_init_image_size
   40         .long   2b - 1b
   41 
   42 _apm_version:
   43         .globl  _apm_version
   44         .long   0
   45 
   46 _apm_cs_entry:
   47         .globl  _apm_cs_entry
   48         .long   0
   49 
   50 _apm_cs16_base:
   51         .globl  _apm_cs16_base
   52         .word   0
   53 
   54 _apm_cs32_base:
   55         .globl  _apm_cs32_base
   56         .word   0
   57 
   58 _apm_ds_base:
   59         .globl  _apm_ds_base
   60         .word   0
   61 
   62 _apm_cs32_limit:
   63         .globl  _apm_cs32_limit
   64         .word   0
   65 
   66 _apm_cs16_limit:
   67         .globl  _apm_cs16_limit
   68         .word   0
   69 
   70 _apm_ds_limit:
   71         .globl  _apm_ds_limit
   72         .word   0
   73 
   74 _apm_flags:
   75         .globl  _apm_flags
   76         .word   0
   77         .globl  _apm_current_gdt_pdesc          /* current GDT pseudo desc. */
   78 _apm_current_gdt_pdesc:
   79         .word   0, 0, 0
   80 
   81         .globl  _bootstrap_gdt
   82 _bootstrap_gdt:
   83         .space  SIZEOF_GDT*BOOTSTRAP_GDT_NUM 
   84 
   85         .text
   86 _apm_setup:
   87         .globl  _apm_setup
   88 
   89         /*
   90          * Setup APM BIOS:
   91          *
   92          * APM BIOS initialization should be done from real mode or V86 mode.
   93          *
   94          * (by HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>)
   95          */
   96 
   97         /*
   98          * Don't trust the value of %fs and %gs (some AT-compatible BIOS 
   99          * implementations leave junk values in these segment registers
  100          * on bootstrap)
  101          */
  102         xorl    %eax, %eax      /* null selector */
  103         movw    %ax, %fs
  104         movw    %ax, %gs
  105 
  106         /* 
  107          * Copy APM initializer under 1MB boundary:
  108          *
  109          * APM initializer program must switch the CPU to real mode.
  110          * But FreeBSD kernel runs above 1MB boundary. So we must 
  111          * copy the initializer code to conventional memory.
  112          */
  113         movl    PADDR(_apm_init_image_size), %ecx       /* size */
  114         lea     PADDR(_apm_init_image), %esi            /* source */
  115         movl    $ APM_OURADDR, %edi                     /* destination */
  116         cld
  117         rep
  118         movsb
  119 
  120         /* get GDT base */
  121         sgdt    PADDR(_apm_current_gdt_pdesc)
  122 
  123         /* copy GDT to _bootstrap_gdt */
  124         xorl    %ecx, %ecx
  125         movw    PADDR(_apm_current_gdt_pdesc), %cx
  126         movl    PADDR(_apm_current_gdt_pdesc + 2), %esi
  127         lea     PADDR(_bootstrap_gdt), %edi
  128         cld
  129         rep
  130         movsb
  131 
  132         /* setup GDT pseudo descriptor */
  133         movw    $(SIZEOF_GDT*BOOTSTRAP_GDT_NUM), %ax
  134         movw    %ax, PADDR(_apm_current_gdt_pdesc)
  135         leal    PADDR(_bootstrap_gdt), %eax
  136         movl    %eax, PADDR(_apm_current_gdt_pdesc + 2)
  137 
  138         /* load new GDTR */
  139         lgdt    PADDR(_apm_current_gdt_pdesc)
  140 
  141         /* setup GDT for APM initializer */
  142         lea     PADDR(_bootstrap_gdt), %ecx
  143         movl    $(APM_OURADDR), %eax    /* use %ax for 15..0 */
  144         movl    %eax, %ebx
  145         shrl    $16, %ebx               /* use %bl for 23..16 */
  146                                         /* use %bh for 31..24 */
  147 #define APM_SETUP_GDT(index, attrib) \
  148         movl    $(index), %si ; \
  149         lea     0(%ecx,%esi,8), %edx ; \
  150         movw    $0xffff, (%edx) ; \
  151         movw    %ax, 2(%edx) ; \
  152         movb    %bl, 4(%edx) ; \
  153         movw    $(attrib), 5(%edx) ; \
  154         movb    %bh, 7(%edx)
  155 
  156         APM_SETUP_GDT(APM_INIT_CS_INDEX  , CS32_ATTRIB)
  157         APM_SETUP_GDT(APM_INIT_DS_INDEX  , DS32_ATTRIB)
  158         APM_SETUP_GDT(APM_INIT_CS16_INDEX, CS16_ATTRIB)
  159         APM_SETUP_GDT(APM_INIT_DS16_INDEX, DS16_ATTRIB)
  160 
  161         /*
  162          * Call the initializer:
  163          *
  164          * direct intersegment call to conventional memory code
  165          */
  166         .byte   0x9a            /* actually, lcall $APM_INIT_CS_SEL, $0 */
  167         .long   0
  168         .word   APM_INIT_CS_SEL
  169 
  170         movl    %eax, PADDR(_apm_version)
  171         movl    %ebx, PADDR(_apm_cs_entry)
  172         movw    %cx, PADDR(_apm_cs16_base)
  173         shrl    $16, %ecx
  174         movw    %cx, PADDR(_apm_cs32_base)
  175         movw    %dx, PADDR(_apm_ds_base)
  176         movw    %si, PADDR(_apm_cs32_limit)
  177         shrl    $16, %esi
  178         movw    %si, PADDR(_apm_ds_limit)
  179         movw    %di, PADDR(_apm_flags)
  180 
  181         ret
  182 
  183 .text
  184         .align 2
  185         .globl  _apm_bios_call
  186 _apm_bios_call:
  187         pushl   %ebp
  188         movl    8(%esp),%ebp
  189         pushl   %esi
  190         pushl   %edi
  191         pushl   %ebx
  192         movl    20(%ebp),%edi
  193         movl    16(%ebp),%esi
  194         movl    12(%ebp),%edx
  195         movl    8(%ebp),%ecx
  196         movl    4(%ebp),%ebx
  197         movl    0(%ebp),%eax
  198         pushl   %ebp
  199         lcall   _apm_addr
  200         popl    %ebp
  201         movl    %eax,0(%ebp)
  202         jc      1f
  203         xorl    %eax,%eax
  204         jz      2f
  205 1:      movl    $1, %eax
  206 2:      movl    %ebx,4(%ebp)
  207         movl    %ecx,8(%ebp)
  208         movl    %edx,12(%ebp)
  209         movl    %esi,16(%ebp)
  210         movl    %edi,20(%ebp)
  211         popl    %ebx
  212         popl    %edi
  213         popl    %esi
  214         popl    %ebp
  215         ret
  216 #endif NAPM > 0

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FreeBSD/Linux Kernel Cross Reference sys/i386/apm/apm_setup.s

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sys/i386/apm/apm_setup.s