1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * Machine specific APM BIOS functions for ge
4 * Split out from apm.c by Osamu Tomita <tomi
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,
28 u32 *e
29 u32 *e
30 {
31 /*
32 * N.B. We do NOT need a cld after the
33 * because we always save and restore
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\
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), "=
44 "=S" (*esi)
45 : "a" (func), "b" (ebx_in), "c
46 : "memory", "cc");
47 }
48
49 static inline bool apm_bios_call_simple_asm(u3
50 u3
51 {
52 int cx, dx, si;
53 bool error;
54
55 /*
56 * N.B. We do NOT need a cld after the
57 * because we always save and restore
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\
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), "
68 "=S" (si)
69 : "a" (func), "b" (ebx_in), "c
70 : "memory", "cc");
71 return error;
72 }
73
74 #endif /* _ASM_X86_MACH_DEFAULT_APM_H */
75
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