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); 95