LXR linux/arch/x86/include/asm/microcode

   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
   7struct 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
  20struct microcode_intel {
  21        struct microcode_header_intel hdr;
  22        unsigned int            bits[0];
  23};
  24
  25/* microcode format is extended from prescott processors */
  26struct extended_signature {
  27        unsigned int            sig;
  28        unsigned int            pf;
  29        unsigned int            cksum;
  30};
  31
  32struct 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
  56static 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
  72extern void __init load_ucode_intel_bsp(void);
  73extern void load_ucode_intel_ap(void);
  74extern void show_ucode_info_early(void);
  75extern int __init save_microcode_in_initrd_intel(void);
  76void reload_ucode_intel(void);
  77#else
  78static inline __init void load_ucode_intel_bsp(void) {}
  79static inline void load_ucode_intel_ap(void) {}
  80static inline void show_ucode_info_early(void) {}
  81static inline int __init save_microcode_in_initrd_intel(void) { return -EINVAL; }
  82static inline void reload_ucode_intel(void) {}
  83#endif
  84
  85#endif /* _ASM_X86_MICROCODE_INTEL_H */
  86