0a26537502
When we want to _completely_ disable XSAVE support as far as the kernel is concerned, we have a big set of feature flags to clear. We currently only do this in cases where the user asks for it to be disabled, but we are about to expand the places where we do it to handle errors too. Move the code in to xstate.c, and put it in the xstate.h header. We will use it in the next patch too. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: dave@sr71.net Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/20150902233124.EA9A70E5@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
#ifndef __ASM_X86_XSAVE_H
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#define __ASM_X86_XSAVE_H
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#include <linux/types.h>
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#include <asm/processor.h>
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#include <linux/uaccess.h>
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/* Bit 63 of XCR0 is reserved for future expansion */
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#define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63)))
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#define XSTATE_CPUID 0x0000000d
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#define FXSAVE_SIZE 512
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#define XSAVE_HDR_SIZE 64
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#define XSAVE_HDR_OFFSET FXSAVE_SIZE
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#define XSAVE_YMM_SIZE 256
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#define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
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/* Supported features which support lazy state saving */
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#define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
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| XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
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/* Supported features which require eager state saving */
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#define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
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/* All currently supported features */
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#define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER)
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#ifdef CONFIG_X86_64
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#define REX_PREFIX "0x48, "
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#else
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#define REX_PREFIX
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#endif
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extern unsigned int xstate_size;
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extern u64 xfeatures_mask;
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extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
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extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
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void fpu__xstate_clear_all_cpu_caps(void);
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void *get_xsave_addr(struct xregs_state *xsave, int xstate);
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const void *get_xsave_field_ptr(int xstate_field);
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#endif
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