V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / include / asm-x86 / mach-default / apm.h
blob1f730b8bd1fd463af3d02d714812b7933703e261
1 /*
2 * include/asm-i386/mach-default/apm.h
4 * Machine specific APM BIOS functions for generic.
5 * Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
6 */
8 #ifndef _ASM_APM_H
9 #define _ASM_APM_H
11 #ifdef APM_ZERO_SEGS
12 # define APM_DO_ZERO_SEGS \
13 "pushl %%ds\n\t" \
14 "pushl %%es\n\t" \
15 "xorl %%edx, %%edx\n\t" \
16 "mov %%dx, %%ds\n\t" \
17 "mov %%dx, %%es\n\t" \
18 "mov %%dx, %%fs\n\t" \
19 "mov %%dx, %%gs\n\t"
20 # define APM_DO_POP_SEGS \
21 "popl %%es\n\t" \
22 "popl %%ds\n\t"
23 #else
24 # define APM_DO_ZERO_SEGS
25 # define APM_DO_POP_SEGS
26 #endif
28 static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
29 u32 *eax, u32 *ebx, u32 *ecx,
30 u32 *edx, u32 *esi)
33 * N.B. We do NOT need a cld after the BIOS call
34 * because we always save and restore the flags.
36 __asm__ __volatile__(APM_DO_ZERO_SEGS
37 "pushl %%edi\n\t"
38 "pushl %%ebp\n\t"
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");
50 static inline u8 apm_bios_call_simple_asm(u32 func, u32 ebx_in,
51 u32 ecx_in, u32 *eax)
53 int cx, dx, si;
54 u8 error;
57 * N.B. We do NOT need a cld after the BIOS call
58 * because we always save and restore the flags.
60 __asm__ __volatile__(APM_DO_ZERO_SEGS
61 "pushl %%edi\n\t"
62 "pushl %%ebp\n\t"
63 "lcall *%%cs:apm_bios_entry\n\t"
64 "setc %%bl\n\t"
65 "popl %%ebp\n\t"
66 "popl %%edi\n\t"
67 APM_DO_POP_SEGS
68 : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
69 "=S" (si)
70 : "a" (func), "b" (ebx_in), "c" (ecx_in)
71 : "memory", "cc");
72 return error;
75 #endif /* _ASM_APM_H */