LXR linux/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
  26static 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
  48static inline u8 apm_bios_call_simple_asm(u32 func, u32 ebx_in,
  49                                                u32 ecx_in, u32 *eax)
  50{
  51        int     cx, dx, si;
  52        u8      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 */
  74