apm.h (1768B)
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 27static 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 49static 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 */