Commit 7f274e60 authored by Sandipan Das's avatar Sandipan Das Committed by Ingo Molnar
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x86/cpufeatures: Add new word for scattered features 



Add a new word for scattered features because all free bits among the
existing Linux-defined auxiliary flags have been exhausted.

Signed-off-by: default avatarSandipan Das <sandipan.das@amd.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/8380d2a0da469a1f0ad75b8954a79fb689599ff6.1711091584.git.sandipan.das@amd.com
parent 4cece764

arch/x86/include/asm/cpufeature.h

+4 −2
Original line number Diff line number Diff line
@@ -91,8 +91,9 @@ extern const char * const x86_bug_flags[NBUGINTS*32]; 
	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) ||	\

	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 19, feature_bit) ||	\

	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 20, feature_bit) ||	\

	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 21, feature_bit) ||	\

	   REQUIRED_MASK_CHECK					  ||	\

	   BUILD_BUG_ON_ZERO(NCAPINTS != 21))

	   BUILD_BUG_ON_ZERO(NCAPINTS != 22))



#define DISABLED_MASK_BIT_SET(feature_bit)				\

	 ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  0, feature_bit) ||	\
@@ -116,8 +117,9 @@ extern const char * const x86_bug_flags[NBUGINTS*32]; 
	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) ||	\

	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 19, feature_bit) ||	\

	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 20, feature_bit) ||	\

	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 21, feature_bit) ||	\

	   DISABLED_MASK_CHECK					  ||	\

	   BUILD_BUG_ON_ZERO(NCAPINTS != 21))

	   BUILD_BUG_ON_ZERO(NCAPINTS != 22))



#define cpu_has(c, bit)							\

	(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :	\

arch/x86/include/asm/cpufeatures.h

+1 −1
Original line number Diff line number Diff line
@@ -13,7 +13,7 @@ 
/*

 * Defines x86 CPU feature bits

 */

#define NCAPINTS			21	   /* N 32-bit words worth of info */

#define NCAPINTS			22	   /* N 32-bit words worth of info */

#define NBUGINTS			2	   /* N 32-bit bug flags */



/*

arch/x86/include/asm/disabled-features.h

+2 −1
Original line number Diff line number Diff line
@@ -155,6 +155,7 @@ 
#define DISABLED_MASK18	(DISABLE_IBT)

#define DISABLED_MASK19	(DISABLE_SEV_SNP)

#define DISABLED_MASK20	0

#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 21)

#define DISABLED_MASK21	0

#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 22)



#endif /* _ASM_X86_DISABLED_FEATURES_H */

arch/x86/include/asm/required-features.h

+2 −1
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ 
#define REQUIRED_MASK18	0

#define REQUIRED_MASK19	0

#define REQUIRED_MASK20	0

#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 21)

#define REQUIRED_MASK21	0

#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 22)



#endif /* _ASM_X86_REQUIRED_FEATURES_H */