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 | |