blob: 989f34c37d321249f838efe86d4e9c2086b42233 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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_APM_H
7#define _ASM_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_APM_H */