1 files changed, 74 insertions, 0 deletions
diff --git a/arch/x86/include/asm/apm.h b/arch/x86/include/asm/apm.h
new file mode 100644
index 000000000..4d4015ddc
--- /dev/null
+++ b/arch/x86/include/asm/apm.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Machine specific APM BIOS functions for generic.
+ *  Split out from apm.c by Osamu Tomita <tomita@cinet.co.jp>
+ */
+
+#ifndef _ASM_X86_MACH_DEFAULT_APM_H
+#define _ASM_X86_MACH_DEFAULT_APM_H
+
+#ifdef APM_ZERO_SEGS
+#	define APM_DO_ZERO_SEGS \
+		"pushl %%ds\n\t" \
+		"pushl %%es\n\t" \
+		"xorl %%edx, %%edx\n\t" \
+		"mov %%dx, %%ds\n\t" \
+		"mov %%dx, %%es\n\t" \
+		"mov %%dx, %%fs\n\t" \
+		"mov %%dx, %%gs\n\t"
+#	define APM_DO_POP_SEGS \
+		"popl %%es\n\t" \
+		"popl %%ds\n\t"
+#else
+#	define APM_DO_ZERO_SEGS
+#	define APM_DO_POP_SEGS
+#endif
+
+static inline void apm_bios_call_asm(u32 func, u32 ebx_in, u32 ecx_in,
+					u32 *eax, u32 *ebx, u32 *ecx,
+					u32 *edx, u32 *esi)
+{
+	/*
+	 * N.B. We do NOT need a cld after the BIOS call
+	 * because we always save and restore the flags.
+	 */
+	__asm__ __volatile__(APM_DO_ZERO_SEGS
+		"pushl %%edi\n\t"
+		"pushl %%ebp\n\t"
+		"lcall *%%cs:apm_bios_entry\n\t"
+		"setc %%al\n\t"
+		"popl %%ebp\n\t"
+		"popl %%edi\n\t"
+		APM_DO_POP_SEGS
+		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
+		  "=S" (*esi)
+		: "a" (func), "b" (ebx_in), "c" (ecx_in)
+		: "memory", "cc");
+}
+
+static inline bool apm_bios_call_simple_asm(u32 func, u32 ebx_in,
+					    u32 ecx_in, u32 *eax)
+{
+	int	cx, dx, si;
+	bool	error;
+
+	/*
+	 * N.B. We do NOT need a cld after the BIOS call
+	 * because we always save and restore the flags.
+	 */
+	__asm__ __volatile__(APM_DO_ZERO_SEGS
+		"pushl %%edi\n\t"
+		"pushl %%ebp\n\t"
+		"lcall *%%cs:apm_bios_entry\n\t"
+		"setc %%bl\n\t"
+		"popl %%ebp\n\t"
+		"popl %%edi\n\t"
+		APM_DO_POP_SEGS
+		: "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
+		  "=S" (si)
+		: "a" (func), "b" (ebx_in), "c" (ecx_in)
+		: "memory", "cc");
+	return error;
+}
+
+#endif /* _ASM_X86_MACH_DEFAULT_APM_H */