1 files changed, 73 insertions, 0 deletions

diff --git a/arch/x86/include/asm/apm.h b/arch/x86/include/asm/apm.h
new file mode 100644
index 000000000000..20370c6db74b
--- /dev/null
+++ b/arch/x86/include/asm/apm.h
@@ -0,0 +1,73 @@
+/*
+ *  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 u8 apm_bios_call_simple_asm(u32 func, u32 ebx_in,
+                                                u32 ecx_in, u32 *eax)
+{
+        int     cx, dx, si;
+        u8      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 */