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 bool mtrr_debug;
  14 #define Dprintk(x...) do { if (mtrr_debug) pr_info(x); } while (0)
  15
  16 extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
  17
  18 struct mtrr_ops {
  19         u32     var_regs;
  20         void    (*set)(unsigned int reg, unsigned long base,
  21                        unsigned long size, mtrr_type type);
  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
  57 extern const struct mtrr_ops *mtrr_if;
  58 extern struct mutex mtrr_mutex;
  59
  60 extern unsigned int num_var_ranges;
  61 extern u64 mtrr_tom2;
  62 extern struct mtrr_state_type mtrr_state;
  63 extern u32 phys_hi_rsvd;
  64
  65 void mtrr_state_warn(void);
  66 const char *mtrr_attrib_to_str(int x);
  67 void mtrr_wrmsr(unsigned, unsigned, unsigned);
  68 #ifdef CONFIG_X86_32
  69 void mtrr_set_if(void);
  70 void mtrr_register_syscore(void);
  71 #else
  72 static inline void mtrr_set_if(void) { }
  73 static inline void mtrr_register_syscore(void) { }
  74 #endif
  75 void mtrr_build_map(void);
  76 void mtrr_copy_map(void);
  77
  78 /* CPU specific mtrr_ops vectors. */
  79 extern const struct mtrr_ops amd_mtrr_ops;
  80 extern const struct mtrr_ops cyrix_mtrr_ops;
  81 extern const struct mtrr_ops centaur_mtrr_ops;
  82
  83 extern int changed_by_mtrr_cleanup;
  84 extern int mtrr_cleanup(void);
  85
  86 /*
  87  * Must be used by code which uses mtrr_if to call platform-specific
  88  * MTRR manipulation functions.
  89  */
  90 static inline bool mtrr_enabled(void)
  91 {
  92         return !!mtrr_if;
  93 }
  94 void generic_rebuild_map(void);