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

INCLUDED FROM

DEFINITIONS

1. apm_bios_call_asm
2. apm_bios_call_simple_asm

/*
 *  Machine specific APM BIOS functions for generic.
 *  Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
 */

#ifndef ASM_X86__MACH_DEFAULT__APM_H
#define ASM_X86__MACH_DEFAULT__APM_H

#ifdef APM_ZERO_SEGS
#       define APM_DO_ZERO_SEGS \
                "pushl %%ds\n\t" \
                "pushl %%es\n\t" \
                "xorl %%edx, %%edx\n\t" \
                "mov %%dx, %%ds\n\t" \
                "mov %%dx, %%es\n\t" \
                "mov %%dx, %%fs\n\t" \
                "mov %%dx, %%gs\n\t"
#       define APM_DO_POP_SEGS \
                "popl %%es\n\t" \
                "popl %%ds\n\t"
#else
#       define APM_DO_ZERO_SEGS
#       define APM_DO_POP_SEGS
#endif

static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
                                        u32 *eax, u32 *ebx, u32 *ecx,
                                        u32 *edx, u32 *esi)
{
        /*
         * N.B. We do NOT need a cld after the BIOS call
         * because we always save and restore the flags.
         */
        __asm__ __volatile__(APM_DO_ZERO_SEGS
                "pushl %%edi\n\t"
                "pushl %%ebp\n\t"
                "lcall *%%cs:apm_bios_entry\n\t"
                "setc %%al\n\t"
                "popl %%ebp\n\t"
                "popl %%edi\n\t"
                APM_DO_POP_SEGS
                : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
                  "=S" (*esi)
                : "a" (func), "b" (ebx_in), "c" (ecx_in)
                : "memory", "cc");
}

static inline u8 apm_bios_call_simple_asm(u32 func, u32 ebx_in,
                                                u32 ecx_in, u32 *eax)
{
        int     cx, dx, si;
        u8      error;

        /*
         * N.B. We do NOT need a cld after the BIOS call
         * because we always save and restore the flags.
         */
        __asm__ __volatile__(APM_DO_ZERO_SEGS
                "pushl %%edi\n\t"
                "pushl %%ebp\n\t"
                "lcall *%%cs:apm_bios_entry\n\t"
                "setc %%bl\n\t"
                "popl %%ebp\n\t"
                "popl %%edi\n\t"
                APM_DO_POP_SEGS
                : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
                  "=S" (si)
                : "a" (func), "b" (ebx_in), "c" (ecx_in)
                : "memory", "cc");
        return error;
}

#endif /* ASM_X86__MACH_DEFAULT__APM_H */