[PATCH v7 26/72] x86/fpu: Move xgetbv()/xsetbv() into separate header

Joerg Roedel
2020-09-07T13:15:27Z

The xgetbv() function is needed in pre-decompression boot code, but
asm/fpu/internal.h can't be included there directly. Doing so opens
the door to include-hell due to various include-magic in
boot/compressed/misc.h.

Avoid that by moving xgetbv()/xsetbv() to a separate header file and
include this instead.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 arch/x86/include/asm/fpu/internal.h | 30 +------------------------
 arch/x86/include/asm/fpu/xcr.h      | 34 +++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 29 deletions(-)
 create mode 100644 arch/x86/include/asm/fpu/xcr.h

diff --git a/arch/x86/include/asm/fpu/internal.h
b/arch/x86/include/asm/fpu/internal.h
index 21a8b5259477..ceeba9f63172 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -19,6 +19,7 @@
 #include <asm/user.h>
 #include <asm/fpu/api.h>
 #include <asm/fpu/xstate.h>
+#include <asm/fpu/xcr.h>
 #include <asm/cpufeature.h>
 #include <asm/trace/fpu.h>

@@ -585,33 +586,4 @@ static inline void switch_fpu_finish(struct fpu *new_fpu)
 	__write_pkru(pkru_val);
 }

-/*
- * MXCSR and XCR definitions:
- */
-
-static inline void ldmxcsr(u32 mxcsr)
-{
-	asm volatile("ldmxcsr %0" :: "m" (mxcsr));
-}
-
-extern unsigned int mxcsr_feature_mask;
-
-#define XCR_XFEATURE_ENABLED_MASK	0x00000000
-
-static inline u64 xgetbv(u32 index)
-{
-	u32 eax, edx;
-
-	asm volatile("xgetbv" : "=a" (eax), "=d" (edx) :
"c" (index));
-	return eax + ((u64)edx << 32);
-}
-
-static inline void xsetbv(u32 index, u64 value)
-{
-	u32 eax = value;
-	u32 edx = value >> 32;
-
-	asm volatile("xsetbv" :: "a" (eax), "d" (edx),
"c" (index));
-}
-
 #endif /* _ASM_X86_FPU_INTERNAL_H */
diff --git a/arch/x86/include/asm/fpu/xcr.h b/arch/x86/include/asm/fpu/xcr.h
new file mode 100644
index 000000000000..1c7ab8d95da5
--- /dev/null
+++ b/arch/x86/include/asm/fpu/xcr.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_FPU_XCR_H
+#define _ASM_X86_FPU_XCR_H
+
+/*
+ * MXCSR and XCR definitions:
+ */
+
+static inline void ldmxcsr(u32 mxcsr)
+{
+	asm volatile("ldmxcsr %0" :: "m" (mxcsr));
+}
+
+extern unsigned int mxcsr_feature_mask;
+
+#define XCR_XFEATURE_ENABLED_MASK	0x00000000
+
+static inline u64 xgetbv(u32 index)
+{
+	u32 eax, edx;
+
+	asm volatile("xgetbv" : "=a" (eax), "=d" (edx) :
"c" (index));
+	return eax + ((u64)edx << 32);
+}
+
+static inline void xsetbv(u32 index, u64 value)
+{
+	u32 eax = value;
+	u32 edx = value >> 32;
+
+	asm volatile("xsetbv" :: "a" (eax), "d" (edx),
"c" (index));
+}
+
+#endif /* _ASM_X86_FPU_XCR_H */
--
2.28.0