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