arch/x86/include/asm/microcode_intel.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_MICROCODE_INTEL_H
   3 #define _ASM_X86_MICROCODE_INTEL_H
   4
   5 #include <asm/microcode.h>
   6
   7 struct microcode_header_intel {
   8         unsigned int            hdrver;
   9         unsigned int            rev;
  10         unsigned int            date;
  11         unsigned int            sig;
  12         unsigned int            cksum;
  13         unsigned int            ldrver;
  14         unsigned int            pf;
  15         unsigned int            datasize;
  16         unsigned int            totalsize;
  17         unsigned int            reserved[3];
  18 };
  19
  20 struct microcode_intel {
  21         struct microcode_header_intel hdr;
  22         unsigned int            bits[0];
  23 };
  24
  25 /* microcode format is extended from prescott processors */
  26 struct extended_signature {
  27         unsigned int            sig;
  28         unsigned int            pf;
  29         unsigned int            cksum;
  30 };
  31
  32 struct extended_sigtable {
  33         unsigned int            count;
  34         unsigned int            cksum;
  35         unsigned int            reserved[3];
  36         struct extended_signature sigs[0];
  37 };
  38
  39 #define DEFAULT_UCODE_DATASIZE  (2000)
  40 #define MC_HEADER_SIZE          (sizeof(struct microcode_header_intel))
  41 #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
  42 #define EXT_HEADER_SIZE         (sizeof(struct extended_sigtable))
  43 #define EXT_SIGNATURE_SIZE      (sizeof(struct extended_signature))
  44
  45 #define get_totalsize(mc) \
  46         (((struct microcode_intel *)mc)->hdr.datasize ? \
  47          ((struct microcode_intel *)mc)->hdr.totalsize : \
  48          DEFAULT_UCODE_TOTALSIZE)
  49
  50 #define get_datasize(mc) \
  51         (((struct microcode_intel *)mc)->hdr.datasize ? \
  52          ((struct microcode_intel *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
  53
  54 #define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
  55
  56 static inline u32 intel_get_microcode_revision(void)
  57 {
  58         u32 rev, dummy;
  59
  60         native_wrmsrl(MSR_IA32_UCODE_REV, 0);
  61
  62         /* As documented in the SDM: Do a CPUID 1 here */
  63         native_cpuid_eax(1);
  64
  65         /* get the current revision from MSR 0x8B */
  66         native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev);
  67
  68         return rev;
  69 }
  70
  71 #ifdef CONFIG_MICROCODE_INTEL
  72 extern void __init load_ucode_intel_bsp(void);
  73 extern void load_ucode_intel_ap(void);
  74 extern void show_ucode_info_early(void);
  75 extern int __init save_microcode_in_initrd_intel(void);
  76 void reload_ucode_intel(void);
  77 #else
  78 static inline __init void load_ucode_intel_bsp(void) {}
  79 static inline void load_ucode_intel_ap(void) {}
  80 static inline void show_ucode_info_early(void) {}
  81 static inline int __init save_microcode_in_initrd_intel(void) { return -EINVAL; }
  82 static inline void reload_ucode_intel(void) {}
  83 #endif
  84
  85 #endif /* _ASM_X86_MICROCODE_INTEL_H */