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TOMOYO Linux Cross Reference
Linux/arch/x86/include/asm/apm.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *  Machine specific APM BIOS functions for generic.
  4  *  Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
  5  */
  6 
  7 #ifndef _ASM_X86_MACH_DEFAULT_APM_H
  8 #define _ASM_X86_MACH_DEFAULT_APM_H
  9 
 10 #ifdef APM_ZERO_SEGS
 11 #       define APM_DO_ZERO_SEGS \
 12                 "pushl %%ds\n\t" \
 13                 "pushl %%es\n\t" \
 14                 "xorl %%edx, %%edx\n\t" \
 15                 "mov %%dx, %%ds\n\t" \
 16                 "mov %%dx, %%es\n\t" \
 17                 "mov %%dx, %%fs\n\t" \
 18                 "mov %%dx, %%gs\n\t"
 19 #       define APM_DO_POP_SEGS \
 20                 "popl %%es\n\t" \
 21                 "popl %%ds\n\t"
 22 #else
 23 #       define APM_DO_ZERO_SEGS
 24 #       define APM_DO_POP_SEGS
 25 #endif
 26 
 27 static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
 28                                         u32 *eax, u32 *ebx, u32 *ecx,
 29                                         u32 *edx, u32 *esi)
 30 {
 31         /*
 32          * N.B. We do NOT need a cld after the BIOS call
 33          * because we always save and restore the flags.
 34          */
 35         __asm__ __volatile__(APM_DO_ZERO_SEGS
 36                 "pushl %%edi\n\t"
 37                 "pushl %%ebp\n\t"
 38                 "lcall *%%cs:apm_bios_entry\n\t"
 39                 "setc %%al\n\t"
 40                 "popl %%ebp\n\t"
 41                 "popl %%edi\n\t"
 42                 APM_DO_POP_SEGS
 43                 : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
 44                   "=S" (*esi)
 45                 : "a" (func), "b" (ebx_in), "c" (ecx_in)
 46                 : "memory", "cc");
 47 }
 48 
 49 static inline bool apm_bios_call_simple_asm(u32 func, u32 ebx_in,
 50                                             u32 ecx_in, u32 *eax)
 51 {
 52         int     cx, dx, si;
 53         bool    error;
 54 
 55         /*
 56          * N.B. We do NOT need a cld after the BIOS call
 57          * because we always save and restore the flags.
 58          */
 59         __asm__ __volatile__(APM_DO_ZERO_SEGS
 60                 "pushl %%edi\n\t"
 61                 "pushl %%ebp\n\t"
 62                 "lcall *%%cs:apm_bios_entry\n\t"
 63                 "setc %%bl\n\t"
 64                 "popl %%ebp\n\t"
 65                 "popl %%edi\n\t"
 66                 APM_DO_POP_SEGS
 67                 : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
 68                   "=S" (si)
 69                 : "a" (func), "b" (ebx_in), "c" (ecx_in)
 70                 : "memory", "cc");
 71         return error;
 72 }
 73 
 74 #endif /* _ASM_X86_MACH_DEFAULT_APM_H */
 75 

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