75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Machine specific APM BIOS functions for generic.
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* Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
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*/
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#ifndef _ASM_X86_MACH_DEFAULT_APM_H
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#define _ASM_X86_MACH_DEFAULT_APM_H
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#ifdef APM_ZERO_SEGS
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# define APM_DO_ZERO_SEGS \
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"pushl %%ds\n\t" \
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"pushl %%es\n\t" \
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"xorl %%edx, %%edx\n\t" \
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"mov %%dx, %%ds\n\t" \
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"mov %%dx, %%es\n\t" \
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"mov %%dx, %%fs\n\t" \
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"mov %%dx, %%gs\n\t"
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# define APM_DO_POP_SEGS \
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"popl %%es\n\t" \
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"popl %%ds\n\t"
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#else
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# define APM_DO_ZERO_SEGS
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# define APM_DO_POP_SEGS
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#endif
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static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
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u32 *eax, u32 *ebx, u32 *ecx,
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u32 *edx, u32 *esi)
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{
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/*
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* N.B. We do NOT need a cld after the BIOS call
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* because we always save and restore the flags.
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*/
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__asm__ __volatile__(APM_DO_ZERO_SEGS
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"pushl %%edi\n\t"
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"pushl %%ebp\n\t"
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"lcall *%%cs:apm_bios_entry\n\t"
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"setc %%al\n\t"
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"popl %%ebp\n\t"
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"popl %%edi\n\t"
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APM_DO_POP_SEGS
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: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
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"=S" (*esi)
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: "a" (func), "b" (ebx_in), "c" (ecx_in)
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: "memory", "cc");
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}
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static inline bool apm_bios_call_simple_asm(u32 func, u32 ebx_in,
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u32 ecx_in, u32 *eax)
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{
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int cx, dx, si;
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bool error;
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/*
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* N.B. We do NOT need a cld after the BIOS call
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* because we always save and restore the flags.
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*/
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__asm__ __volatile__(APM_DO_ZERO_SEGS
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"pushl %%edi\n\t"
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"pushl %%ebp\n\t"
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"lcall *%%cs:apm_bios_entry\n\t"
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"setc %%bl\n\t"
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"popl %%ebp\n\t"
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"popl %%edi\n\t"
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APM_DO_POP_SEGS
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: "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
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"=S" (si)
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: "a" (func), "b" (ebx_in), "c" (ecx_in)
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: "memory", "cc");
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return error;
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}
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#endif /* _ASM_X86_MACH_DEFAULT_APM_H */
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