75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* 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 bool apm_bios_call_simple_asm(u32 func, u32 ebx_in,
|
|
u32 ecx_in, u32 *eax)
|
|
{
|
|
int cx, dx, si;
|
|
bool 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 */
|