1106184Smarcel/* SPDX-License-Identifier: GPL-2.0 */
2106184Smarcel/*
3106184Smarcel *  Machine specific APM BIOS functions for generic.
4106184Smarcel *  Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
5106184Smarcel */
6106184Smarcel
7106184Smarcel#ifndef _ASM_X86_MACH_DEFAULT_APM_H
8106184Smarcel#define _ASM_X86_MACH_DEFAULT_APM_H
9106184Smarcel
10106184Smarcel#ifdef APM_ZERO_SEGS
11106184Smarcel#	define APM_DO_ZERO_SEGS \
12106184Smarcel		"pushl %%ds\n\t" \
13106184Smarcel		"pushl %%es\n\t" \
14106184Smarcel		"xorl %%edx, %%edx\n\t" \
15106184Smarcel		"mov %%dx, %%ds\n\t" \
16106184Smarcel		"mov %%dx, %%es\n\t" \
17106184Smarcel		"mov %%dx, %%fs\n\t" \
18106184Smarcel		"mov %%dx, %%gs\n\t"
19106184Smarcel#	define APM_DO_POP_SEGS \
20106184Smarcel		"popl %%es\n\t" \
21106184Smarcel		"popl %%ds\n\t"
22106184Smarcel#else
23106184Smarcel#	define APM_DO_ZERO_SEGS
24106184Smarcel#	define APM_DO_POP_SEGS
25106184Smarcel#endif
26106184Smarcel
27106184Smarcelstatic inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
28106184Smarcel					u32 *eax, u32 *ebx, u32 *ecx,
29106184Smarcel					u32 *edx, u32 *esi)
30106184Smarcel{
31106184Smarcel	/*
32106184Smarcel	 * N.B. We do NOT need a cld after the BIOS call
33106184Smarcel	 * because we always save and restore the flags.
34106184Smarcel	 */
35106184Smarcel	__asm__ __volatile__(APM_DO_ZERO_SEGS
36106184Smarcel		"pushl %%edi\n\t"
37106184Smarcel		"pushl %%ebp\n\t"
38106184Smarcel		"lcall *%%cs:apm_bios_entry\n\t"
39106184Smarcel		"setc %%al\n\t"
40106184Smarcel		"popl %%ebp\n\t"
41106184Smarcel		"popl %%edi\n\t"
42106184Smarcel		APM_DO_POP_SEGS
43106184Smarcel		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
44106184Smarcel		  "=S" (*esi)
45106184Smarcel		: "a" (func), "b" (ebx_in), "c" (ecx_in)
46106184Smarcel		: "memory", "cc");
47106184Smarcel}
48106452Sjmallett
49106184Smarcelstatic inline bool apm_bios_call_simple_asm(u32 func, u32 ebx_in,
50106184Smarcel					    u32 ecx_in, u32 *eax)
51106184Smarcel{
52106184Smarcel	int	cx, dx, si;
53106184Smarcel	bool	error;
54106184Smarcel
55106184Smarcel	/*
56106184Smarcel	 * N.B. We do NOT need a cld after the BIOS call
57106452Sjmallett	 * because we always save and restore the flags.
58106184Smarcel	 */
59106184Smarcel	__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