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1e61f78baf
x86 has two macros which allow us to evaluate some CPUID-based
features at compile time:
REQUIRED_MASK_BIT_SET()
DISABLED_MASK_BIT_SET()
They're both defined by having the compiler check the bit
argument against some constant masks of features.
But, when adding new CPUID leaves, we need to check new words
for these macros. So make sure that those macros and the
REQUIRED_MASK* and DISABLED_MASK* get updated when necessary.
This looks kinda silly to have an open-coded value ("18" in
this case) open-coded in 5 places in the code. But, we really do
need 5 places updated when NCAPINTS gets bumped, so now we just
force the issue.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160629200108.92466F6F@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
#ifndef _ASM_X86_REQUIRED_FEATURES_H
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#define _ASM_X86_REQUIRED_FEATURES_H
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/* Define minimum CPUID feature set for kernel These bits are checked
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really early to actually display a visible error message before the
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kernel dies. Make sure to assign features to the proper mask!
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Some requirements that are not in CPUID yet are also in the
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CONFIG_X86_MINIMUM_CPU_FAMILY which is checked too.
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The real information is in arch/x86/Kconfig.cpu, this just converts
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the CONFIGs into a bitmask */
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#ifndef CONFIG_MATH_EMULATION
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# define NEED_FPU (1<<(X86_FEATURE_FPU & 31))
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#else
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# define NEED_FPU 0
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#endif
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#if defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
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# define NEED_PAE (1<<(X86_FEATURE_PAE & 31))
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#else
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# define NEED_PAE 0
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#endif
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#ifdef CONFIG_X86_CMPXCHG64
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# define NEED_CX8 (1<<(X86_FEATURE_CX8 & 31))
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#else
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# define NEED_CX8 0
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#endif
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#if defined(CONFIG_X86_CMOV) || defined(CONFIG_X86_64)
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# define NEED_CMOV (1<<(X86_FEATURE_CMOV & 31))
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#else
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# define NEED_CMOV 0
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#endif
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#ifdef CONFIG_X86_USE_3DNOW
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# define NEED_3DNOW (1<<(X86_FEATURE_3DNOW & 31))
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#else
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# define NEED_3DNOW 0
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#endif
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#if defined(CONFIG_X86_P6_NOP) || defined(CONFIG_X86_64)
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# define NEED_NOPL (1<<(X86_FEATURE_NOPL & 31))
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#else
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# define NEED_NOPL 0
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#endif
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#ifdef CONFIG_MATOM
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# define NEED_MOVBE (1<<(X86_FEATURE_MOVBE & 31))
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#else
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# define NEED_MOVBE 0
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#endif
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#ifdef CONFIG_X86_64
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#ifdef CONFIG_PARAVIRT
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/* Paravirtualized systems may not have PSE or PGE available */
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#define NEED_PSE 0
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#define NEED_PGE 0
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#else
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#define NEED_PSE (1<<(X86_FEATURE_PSE) & 31)
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#define NEED_PGE (1<<(X86_FEATURE_PGE) & 31)
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#endif
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#define NEED_MSR (1<<(X86_FEATURE_MSR & 31))
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#define NEED_FXSR (1<<(X86_FEATURE_FXSR & 31))
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#define NEED_XMM (1<<(X86_FEATURE_XMM & 31))
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#define NEED_XMM2 (1<<(X86_FEATURE_XMM2 & 31))
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#define NEED_LM (1<<(X86_FEATURE_LM & 31))
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#else
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#define NEED_PSE 0
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#define NEED_MSR 0
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#define NEED_PGE 0
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#define NEED_FXSR 0
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#define NEED_XMM 0
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#define NEED_XMM2 0
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#define NEED_LM 0
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#endif
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#define REQUIRED_MASK0 (NEED_FPU|NEED_PSE|NEED_MSR|NEED_PAE|\
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NEED_CX8|NEED_PGE|NEED_FXSR|NEED_CMOV|\
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NEED_XMM|NEED_XMM2)
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#define SSE_MASK (NEED_XMM|NEED_XMM2)
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#define REQUIRED_MASK1 (NEED_LM|NEED_3DNOW)
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#define REQUIRED_MASK2 0
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#define REQUIRED_MASK3 (NEED_NOPL)
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#define REQUIRED_MASK4 (NEED_MOVBE)
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#define REQUIRED_MASK5 0
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#define REQUIRED_MASK6 0
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#define REQUIRED_MASK7 0
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#define REQUIRED_MASK8 0
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#define REQUIRED_MASK9 0
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#define REQUIRED_MASK10 0
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#define REQUIRED_MASK11 0
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#define REQUIRED_MASK12 0
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#define REQUIRED_MASK13 0
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#define REQUIRED_MASK14 0
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#define REQUIRED_MASK15 0
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#define REQUIRED_MASK16 0
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#define REQUIRED_MASK17 0
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#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 18)
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#endif /* _ASM_X86_REQUIRED_FEATURES_H */
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