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 /* All currently supported user features */
  25 #define XFEATURE_MASK_USER_SUPPORTED (XFEATURE_MASK_FP | \
  26                                       XFEATURE_MASK_SSE | \
  27                                       XFEATURE_MASK_YMM | \
  28                                       XFEATURE_MASK_OPMASK | \
  29                                       XFEATURE_MASK_ZMM_Hi256 | \
  30                                       XFEATURE_MASK_Hi16_ZMM     | \
  31                                       XFEATURE_MASK_PKRU | \
  32                                       XFEATURE_MASK_BNDREGS | \
  33                                       XFEATURE_MASK_BNDCSR)
  34
  35 /* All currently supported supervisor features */
  36 #define XFEATURE_MASK_SUPERVISOR_SUPPORTED (0)
  37
  38 /*
  39  * Unsupported supervisor features. When a supervisor feature in this mask is
  40  * supported in the future, move it to the supported supervisor feature mask.
  41  */
  42 #define XFEATURE_MASK_SUPERVISOR_UNSUPPORTED (XFEATURE_MASK_PT)
  43
  44 /* All supervisor states including supported and unsupported states. */
  45 #define XFEATURE_MASK_SUPERVISOR_ALL (XFEATURE_MASK_SUPERVISOR_SUPPORTED | \
  46                                       XFEATURE_MASK_SUPERVISOR_UNSUPPORTED)
  47
  48 #ifdef CONFIG_X86_64
  49 #define REX_PREFIX      "0x48, "
  50 #else
  51 #define REX_PREFIX
  52 #endif
  53
  54 extern u64 xfeatures_mask_all;
  55
  56 static inline u64 xfeatures_mask_supervisor(void)
  57 {
  58         return xfeatures_mask_all & XFEATURE_MASK_SUPERVISOR_SUPPORTED;
  59 }
  60
  61 static inline u64 xfeatures_mask_user(void)
  62 {
  63         return xfeatures_mask_all & XFEATURE_MASK_USER_SUPPORTED;
  64 }
  65
  66 extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
  67
  68 extern void __init update_regset_xstate_info(unsigned int size,
  69                                              u64 xstate_mask);
  70
  71 void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr);
  72 const void *get_xsave_field_ptr(int xfeature_nr);
  73 int using_compacted_format(void);
  74 struct membuf;
  75 void copy_xstate_to_kernel(struct membuf to, struct xregs_state *xsave);
  76 int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
  77 int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
  78 void copy_supervisor_to_kernel(struct xregs_state *xsave);
  79
  80 /* Validate an xstate header supplied by userspace (ptrace or sigreturn) */
  81 int validate_user_xstate_header(const struct xstate_header *hdr);
  82
  83 #endif