arch/x86/include/asm/fpu/xstate.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_X86_XSAVE_H
   3 #define __ASM_X86_XSAVE_H
   4
   5 #include <linux/types.h>
   6 #include <asm/processor.h>
   7 #include <linux/uaccess.h>
   8
   9 /* Bit 63 of XCR0 is reserved for future expansion */
  10 #define XFEATURE_MASK_EXTEND    (~(XFEATURE_MASK_FPSSE | (1ULL << 63)))
  11
  12 #define XSTATE_CPUID            0x0000000d
  13
  14 #define FXSAVE_SIZE     512
  15
  16 #define XSAVE_HDR_SIZE      64
  17 #define XSAVE_HDR_OFFSET    FXSAVE_SIZE
  18
  19 #define XSAVE_YMM_SIZE      256
  20 #define XSAVE_YMM_OFFSET    (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
  21
  22 /* Supervisor features */
  23 #define XFEATURE_MASK_SUPERVISOR (XFEATURE_MASK_PT)
  24
  25 /* All currently supported features */
  26 #define XCNTXT_MASK             (XFEATURE_MASK_FP | \
  27                                  XFEATURE_MASK_SSE | \
  28                                  XFEATURE_MASK_YMM | \
  29                                  XFEATURE_MASK_OPMASK | \
  30                                  XFEATURE_MASK_ZMM_Hi256 | \
  31                                  XFEATURE_MASK_Hi16_ZMM  | \
  32                                  XFEATURE_MASK_PKRU | \
  33                                  XFEATURE_MASK_BNDREGS | \
  34                                  XFEATURE_MASK_BNDCSR)
  35
  36 #ifdef CONFIG_X86_64
  37 #define REX_PREFIX      "0x48, "
  38 #else
  39 #define REX_PREFIX
  40 #endif
  41
  42 extern u64 xfeatures_mask;
  43 extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
  44
  45 extern void __init update_regset_xstate_info(unsigned int size,
  46                                              u64 xstate_mask);
  47
  48 void fpu__xstate_clear_all_cpu_caps(void);
  49 void *get_xsave_addr(struct xregs_state *xsave, int xstate);
  50 const void *get_xsave_field_ptr(int xstate_field);
  51 int using_compacted_format(void);
  52 int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
  53 int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
  54 int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
  55 int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
  56
  57 /* Validate an xstate header supplied by userspace (ptrace or sigreturn) */
  58 extern int validate_xstate_header(const struct xstate_header *hdr);
  59
  60 #endif