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