arch/x86/include/asm/apm.h

   1 /*
   2  *  Machine specific APM BIOS functions for generic.
   3  *  Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
   4  */
   5
   6 #ifndef _ASM_X86_MACH_DEFAULT_APM_H
   7 #define _ASM_X86_MACH_DEFAULT_APM_H
   8
   9 #ifdef APM_ZERO_SEGS
  10 #       define APM_DO_ZERO_SEGS \
  11                 "pushl %%ds\n\t" \
  12                 "pushl %%es\n\t" \
  13                 "xorl %%edx, %%edx\n\t" \
  14                 "mov %%dx, %%ds\n\t" \
  15                 "mov %%dx, %%es\n\t" \
  16                 "mov %%dx, %%fs\n\t" \
  17                 "mov %%dx, %%gs\n\t"
  18 #       define APM_DO_POP_SEGS \
  19                 "popl %%es\n\t" \
  20                 "popl %%ds\n\t"
  21 #else
  22 #       define APM_DO_ZERO_SEGS
  23 #       define APM_DO_POP_SEGS
  24 #endif
  25
  26 static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
  27                                         u32 *eax, u32 *ebx, u32 *ecx,
  28                                         u32 *edx, u32 *esi)
  29 {
  30         /*
  31          * N.B. We do NOT need a cld after the BIOS call
  32          * because we always save and restore the flags.
  33          */
  34         __asm__ __volatile__(APM_DO_ZERO_SEGS
  35                 "pushl %%edi\n\t"
  36                 "pushl %%ebp\n\t"
  37                 "lcall *%%cs:apm_bios_entry\n\t"
  38                 "setc %%al\n\t"
  39                 "popl %%ebp\n\t"
  40                 "popl %%edi\n\t"
  41                 APM_DO_POP_SEGS
  42                 : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
  43                   "=S" (*esi)
  44                 : "a" (func), "b" (ebx_in), "c" (ecx_in)
  45                 : "memory", "cc");
  46 }
  47
  48 static inline bool apm_bios_call_simple_asm(u32 func, u32 ebx_in,
  49                                             u32 ecx_in, u32 *eax)
  50 {
  51         int     cx, dx, si;
  52         bool    error;
  53
  54         /*
  55          * N.B. We do NOT need a cld after the BIOS call
  56          * because we always save and restore the flags.
  57          */
  58         __asm__ __volatile__(APM_DO_ZERO_SEGS
  59                 "pushl %%edi\n\t"
  60                 "pushl %%ebp\n\t"
  61                 "lcall *%%cs:apm_bios_entry\n\t"
  62                 "setc %%bl\n\t"
  63                 "popl %%ebp\n\t"
  64                 "popl %%edi\n\t"
  65                 APM_DO_POP_SEGS
  66                 : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
  67                   "=S" (si)
  68                 : "a" (func), "b" (ebx_in), "c" (ecx_in)
  69                 : "memory", "cc");
  70         return error;
  71 }
  72
  73 #endif /* _ASM_X86_MACH_DEFAULT_APM_H */