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6657fca06e
All pieces of the puzzle are in place and we can now allow to boot with CONFIG_X86_5LEVEL=y on a machine without LA57 support. Kernel will detect that LA57 is missing and fold p4d at runtime. Update the documentation and the Kconfig option description to reflect the change. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Woodhouse <dwmw2@infradead.org> 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> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180214182542.69302-10-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
107 lines
2.7 KiB
C
107 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_MASK18 0
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#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 19)
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#endif /* _ASM_X86_REQUIRED_FEATURES_H */
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