include/asm-x86/mach-default/apm.h

   1 /*
   2  *  include/asm-i386/mach-default/apm.h
   3  *
   4  *  Machine specific APM BIOS functions for generic.
   5  *  Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
   6  */
   7
   8 #ifndef _ASM_APM_H
   9 #define _ASM_APM_H
  10
  11 #ifdef APM_ZERO_SEGS
  12 #       define APM_DO_ZERO_SEGS \
  13                 "pushl %%ds\n\t" \
  14                 "pushl %%es\n\t" \
  15                 "xorl %%edx, %%edx\n\t" \
  16                 "mov %%dx, %%ds\n\t" \
  17                 "mov %%dx, %%es\n\t" \
  18                 "mov %%dx, %%fs\n\t" \
  19                 "mov %%dx, %%gs\n\t"
  20 #       define APM_DO_POP_SEGS \
  21                 "popl %%es\n\t" \
  22                 "popl %%ds\n\t"
  23 #else
  24 #       define APM_DO_ZERO_SEGS
  25 #       define APM_DO_POP_SEGS
  26 #endif
  27
  28 static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
  29                                         u32 *eax, u32 *ebx, u32 *ecx,
  30                                         u32 *edx, u32 *esi)
  31 {
  32         /*
  33          * N.B. We do NOT need a cld after the BIOS call
  34          * because we always save and restore the flags.
  35          */
  36         __asm__ __volatile__(APM_DO_ZERO_SEGS
  37                 "pushl %%edi\n\t"
  38                 "pushl %%ebp\n\t"
  39                 "lcall *%%cs:apm_bios_entry\n\t"
  40                 "setc %%al\n\t"
  41                 "popl %%ebp\n\t"
  42                 "popl %%edi\n\t"
  43                 APM_DO_POP_SEGS
  44                 : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
  45                   "=S" (*esi)
  46                 : "a" (func), "b" (ebx_in), "c" (ecx_in)
  47                 : "memory", "cc");
  48 }
  49
  50 static inline u8 apm_bios_call_simple_asm(u32 func, u32 ebx_in,
  51                                                 u32 ecx_in, u32 *eax)
  52 {
  53         int     cx, dx, si;
  54         u8      error;
  55
  56         /*
  57          * N.B. We do NOT need a cld after the BIOS call
  58          * because we always save and restore the flags.
  59          */
  60         __asm__ __volatile__(APM_DO_ZERO_SEGS
  61                 "pushl %%edi\n\t"
  62                 "pushl %%ebp\n\t"
  63                 "lcall *%%cs:apm_bios_entry\n\t"
  64                 "setc %%bl\n\t"
  65                 "popl %%ebp\n\t"
  66                 "popl %%edi\n\t"
  67                 APM_DO_POP_SEGS
  68                 : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
  69                   "=S" (si)
  70                 : "a" (func), "b" (ebx_in), "c" (ecx_in)
  71                 : "memory", "cc");
  72         return error;
  73 }
  74
  75 #endif /* _ASM_APM_H */