sys/i386/bios/smapi_bios.S

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