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/* 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" ANNOTATE_RETPOLINE_SAFE /* FRBS */ "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" ANNOTATE_RETPOLINE_SAFE /* FRBS */ "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 */
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