Unify the CPU features vectors between i386 and x86-64

Unify the handling of the CPU features vectors between i386 and x86-64.
This also adopts the collapsing of features which are required at
compile-time into constant tests from x86-64 to i386.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/include/asm-x86_64/required-features.h b/include/asm-x86_64/required-features.h
new file mode 100644
index 000000000000..262f3159d032
--- /dev/null
+++ b/include/asm-x86_64/required-features.h
@@ -0,0 +1,45 @@
+#ifndef _ASM_REQUIRED_FEATURES_H
+#define _ASM_REQUIRED_FEATURES_H 1
+
+/* Define minimum CPUID feature set for kernel These bits are checked
+   really early to actually display a visible error message before the
+   kernel dies.  Make sure to assign features to the proper mask!
+
+   The real information is in arch/x86_64/Kconfig.cpu, this just converts
+   the CONFIGs into a bitmask */
+
+/* x86-64 baseline features */
+#define NEED_FPU        (1<<(X86_FEATURE_FPU & 31))
+#define NEED_PSE        (1<<(X86_FEATURE_PSE & 31))
+#define NEED_MSR        (1<<(X86_FEATURE_MSR & 31))
+#define NEED_PAE        (1<<(X86_FEATURE_PAE & 31))
+#define NEED_CX8        (1<<(X86_FEATURE_CX8 & 31))
+#define NEED_PGE        (1<<(X86_FEATURE_PGE & 31))
+#define NEED_FXSR       (1<<(X86_FEATURE_FXSR & 31))
+#define NEED_CMOV       (1<<(X86_FEATURE_CMOV & 31))
+#define NEED_XMM        (1<<(X86_FEATURE_XMM & 31))
+#define NEED_XMM2       (1<<(X86_FEATURE_XMM2 & 31))
+
+#define REQUIRED_MASK0  (NEED_FPU|NEED_PSE|NEED_MSR|NEED_PAE|\
+                         NEED_CX8|NEED_PGE|NEED_FXSR|NEED_CMOV|\
+                         NEED_XMM|NEED_XMM2)
+#define SSE_MASK        (NEED_XMM|NEED_XMM2)
+
+/* x86-64 baseline features */
+#define NEED_LM         (1<<(X86_FEATURE_LM & 31))
+
+#ifdef CONFIG_X86_USE_3DNOW
+# define NEED_3DNOW     (1<<(X86_FEATURE_3DNOW & 31))
+#else
+# define NEED_3DNOW     0
+#endif
+
+#define REQUIRED_MASK1  (NEED_LM|NEED_3DNOW)
+
+#define REQUIRED_MASK2  0
+#define REQUIRED_MASK3  0
+#define REQUIRED_MASK4  0
+#define REQUIRED_MASK5  0
+#define REQUIRED_MASK6  0
+
+#endif