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-rw-r--r--arch/x86/include/asm/apm.h74
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 */