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/bios/smapi_bios.S

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    1 #include <machine/asm.h>
    2 __FBSDID("$FreeBSD: releng/6.0/sys/i386/bios/smapi_bios.S 116275 2003-06-13 00:36:03Z mdodd $");
    3 
    4 #include <machine/asmacros.h>
    5 
    6 /*
    7  * This is cribbed from the Linux thinkpad-4.1 driver by
    8  * Thomas Hood.
    9  */
   10 
   11         .align
   12 smapi32_entry:                                  /* far pointer to SMAPI entry */
   13         .globl  smapi32_offset
   14 smapi32_offset:         .long   0x00000000      /* set by caller */
   15 smapi32_segment:        .word   0x0000          /* %cs stored here */
   16 
   17         .text
   18 /*
   19  * smapi32(input_param, output_param)
   20  *      struct smapi_bios_parameter *input_parm;
   21  *      struct smapi_bios_parameter *output_parm;
   22  *
   23  *      stack frame:
   24  *              0x00 : saved ebp
   25  *              0x04 : return EIP
   26  *              0x08 : input_parm
   27  *              0x0c : output_parm
   28  */
   29 ENTRY(smapi32)
   30         pushl   %ebp                    /* Save frame */
   31         movl    %esp,%ebp
   32 
   33         pushl   %ds
   34         pushl   0x0c(%ebp)              /* Output Param */
   35         pushl   %ds
   36         pushl   0x08(%ebp)              /* Input Param */
   37 
   38         movl    $0,%eax                 /* Clear EAX (return 0) */
   39         movw    %cs,smapi32_segment     /* Save CS */
   40         lcall   *(smapi32_offset)
   41 
   42         leave
   43         ret

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