LXR linux/arch/x86/kernel/cpu/mtrr/mtrr.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * local MTRR defines.
   4 */
   5
   6#include <linux/types.h>
   7#include <linux/stddef.h>
   8
   9#define MTRR_CHANGE_MASK_FIXED     0x01
  10#define MTRR_CHANGE_MASK_VARIABLE  0x02
  11#define MTRR_CHANGE_MASK_DEFTYPE   0x04
  12
  13extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
  14
  15struct mtrr_ops {
  16        u32     vendor;
  17        u32     use_intel_if;
  18        void    (*set)(unsigned int reg, unsigned long base,
  19                       unsigned long size, mtrr_type type);
  20        void    (*set_all)(void);
  21
  22        void    (*get)(unsigned int reg, unsigned long *base,
  23                       unsigned long *size, mtrr_type *type);
  24        int     (*get_free_region)(unsigned long base, unsigned long size,
  25                                   int replace_reg);
  26        int     (*validate_add_page)(unsigned long base, unsigned long size,
  27                                     unsigned int type);
  28        int     (*have_wrcomb)(void);
  29};
  30
  31extern int generic_get_free_region(unsigned long base, unsigned long size,
  32                                   int replace_reg);
  33extern int generic_validate_add_page(unsigned long base, unsigned long size,
  34                                     unsigned int type);
  35
  36extern const struct mtrr_ops generic_mtrr_ops;
  37
  38extern int positive_have_wrcomb(void);
  39
  40/* library functions for processor-specific routines */
  41struct set_mtrr_context {
  42        unsigned long   flags;
  43        unsigned long   cr4val;
  44        u32             deftype_lo;
  45        u32             deftype_hi;
  46        u32             ccr3;
  47};
  48
  49void set_mtrr_done(struct set_mtrr_context *ctxt);
  50void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
  51void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);
  52
  53void fill_mtrr_var_range(unsigned int index,
  54                u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
  55bool get_mtrr_state(void);
  56void mtrr_bp_pat_init(void);
  57
  58extern void __init set_mtrr_ops(const struct mtrr_ops *ops);
  59
  60extern u64 size_or_mask, size_and_mask;
  61extern const struct mtrr_ops *mtrr_if;
  62
  63#define is_cpu(vnd)     (mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
  64#define use_intel()     (mtrr_if && mtrr_if->use_intel_if == 1)
  65
  66extern unsigned int num_var_ranges;
  67extern u64 mtrr_tom2;
  68extern struct mtrr_state_type mtrr_state;
  69
  70void mtrr_state_warn(void);
  71const char *mtrr_attrib_to_str(int x);
  72void mtrr_wrmsr(unsigned, unsigned, unsigned);
  73
  74/* CPU specific mtrr init functions */
  75int amd_init_mtrr(void);
  76int cyrix_init_mtrr(void);
  77int centaur_init_mtrr(void);
  78
  79extern int changed_by_mtrr_cleanup;
  80extern int mtrr_cleanup(unsigned address_bits);
  81