projects / mirror_ubuntu-disco-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1da177e4 | 2 | /* |
| 1da177e4 LT |
3 | * Machine specific APM BIOS functions for generic. |
| 4 | * Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp> | |
| 5 | */ | |
| 6 | ||
| 05e4d316 PA |
7 | #ifndef _ASM_X86_MACH_DEFAULT_APM_H |
| 8 | #define _ASM_X86_MACH_DEFAULT_APM_H | |
| 1da177e4 LT |
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" | |
| 88a1ff0f | 38 | ANNOTATE_RETPOLINE_SAFE /* FRBS */ |
| 1da177e4 LT |
39 | "lcall *%%cs:apm_bios_entry\n\t" |
| 40 | "setc %%al\n\t" | |
| 41 | "popl %%ebp\n\t" | |
| 42 | "popl %%edi\n\t" | |
| 43 | APM_DO_POP_SEGS | |
| 44 | : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx), | |
| 45 | "=S" (*esi) | |
| 46 | : "a" (func), "b" (ebx_in), "c" (ecx_in) | |
| 47 | : "memory", "cc"); | |
| 48 | } | |
| 49 | ||
| 117780ee PA |
50 | static inline bool apm_bios_call_simple_asm(u32 func, u32 ebx_in, |
| 51 | u32 ecx_in, u32 *eax) | |
| 1da177e4 LT |
52 | { |
| 53 | int cx, dx, si; | |
| 117780ee | 54 | bool error; |
| 1da177e4 LT |
55 | |
| 56 | /* | |
| 57 | * N.B. We do NOT need a cld after the BIOS call | |
| 58 | * because we always save and restore the flags. | |
| 59 | */ | |
| 60 | __asm__ __volatile__(APM_DO_ZERO_SEGS | |
| 61 | "pushl %%edi\n\t" | |
| 62 | "pushl %%ebp\n\t" | |
| 88a1ff0f | 63 | ANNOTATE_RETPOLINE_SAFE /* FRBS */ |
| 1da177e4 LT |
64 | "lcall *%%cs:apm_bios_entry\n\t" |
| 65 | "setc %%bl\n\t" | |
| 66 | "popl %%ebp\n\t" | |
| 67 | "popl %%edi\n\t" | |
| 68 | APM_DO_POP_SEGS | |
| 69 | : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx), | |
| 70 | "=S" (si) | |
| 71 | : "a" (func), "b" (ebx_in), "c" (ecx_in) | |
| 72 | : "memory", "cc"); | |
| 73 | return error; | |
| 74 | } | |
| 75 | ||
| 05e4d316 | 76 | #endif /* _ASM_X86_MACH_DEFAULT_APM_H */ |