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
  13 extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
  14
  15 struct 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
  31 extern int generic_get_free_region(unsigned long base, unsigned long size,
  32                                    int replace_reg);
  33 extern int generic_validate_add_page(unsigned long base, unsigned long size,
  34                                      unsigned int type);
  35
  36 extern const struct mtrr_ops generic_mtrr_ops;
  37
  38 extern int positive_have_wrcomb(void);
  39
  40 /* library functions for processor-specific routines */
  41 struct set_mtrr_context {
  42         unsigned long   flags;
  43         unsigned long   cr4val;
  44         u32             deftype_lo;
  45         u32             deftype_hi;
  46         u32             ccr3;
  47 };
  48
  49 void set_mtrr_done(struct set_mtrr_context *ctxt);
  50 void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
  51 void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);
  52
  53 void fill_mtrr_var_range(unsigned int index,
  54                 u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
  55 bool get_mtrr_state(void);
  56 void mtrr_bp_pat_init(void);
  57
  58 extern void __init set_mtrr_ops(const struct mtrr_ops *ops);
  59
  60 extern u64 size_or_mask, size_and_mask;
  61 extern 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
  66 extern unsigned int num_var_ranges;
  67 extern u64 mtrr_tom2;
  68 extern struct mtrr_state_type mtrr_state;
  69
  70 void mtrr_state_warn(void);
  71 const char *mtrr_attrib_to_str(int x);
  72 void mtrr_wrmsr(unsigned, unsigned, unsigned);
  73
  74 /* CPU specific mtrr init functions */
  75 int amd_init_mtrr(void);
  76 int cyrix_init_mtrr(void);
  77 int centaur_init_mtrr(void);
  78
  79 extern int changed_by_mtrr_cleanup;
  80 extern int mtrr_cleanup(unsigned address_bits);