cpu/mtrr/mtrr.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * local MTRR defines.
0004  */
0005
0006 #include <linux/types.h>
0007 #include <linux/stddef.h>
0008
0009 #define MTRR_CHANGE_MASK_FIXED     0x01
0010 #define MTRR_CHANGE_MASK_VARIABLE  0x02
0011 #define MTRR_CHANGE_MASK_DEFTYPE   0x04
0012
0013 extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
0014
0015 struct mtrr_ops {
0016     u32 vendor;
0017     u32 use_intel_if;
0018     void    (*set)(unsigned int reg, unsigned long base,
0019                unsigned long size, mtrr_type type);
0020     void    (*set_all)(void);
0021
0022     void    (*get)(unsigned int reg, unsigned long *base,
0023                unsigned long *size, mtrr_type *type);
0024     int (*get_free_region)(unsigned long base, unsigned long size,
0025                    int replace_reg);
0026     int (*validate_add_page)(unsigned long base, unsigned long size,
0027                      unsigned int type);
0028     int (*have_wrcomb)(void);
0029 };
0030
0031 extern int generic_get_free_region(unsigned long base, unsigned long size,
0032                    int replace_reg);
0033 extern int generic_validate_add_page(unsigned long base, unsigned long size,
0034                      unsigned int type);
0035
0036 extern const struct mtrr_ops generic_mtrr_ops;
0037
0038 extern int positive_have_wrcomb(void);
0039
0040 /* library functions for processor-specific routines */
0041 struct set_mtrr_context {
0042     unsigned long   flags;
0043     unsigned long   cr4val;
0044     u32     deftype_lo;
0045     u32     deftype_hi;
0046     u32     ccr3;
0047 };
0048
0049 void set_mtrr_done(struct set_mtrr_context *ctxt);
0050 void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
0051 void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);
0052
0053 void fill_mtrr_var_range(unsigned int index,
0054         u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
0055 bool get_mtrr_state(void);
0056 void mtrr_bp_pat_init(void);
0057
0058 extern void __init set_mtrr_ops(const struct mtrr_ops *ops);
0059
0060 extern u64 size_or_mask, size_and_mask;
0061 extern const struct mtrr_ops *mtrr_if;
0062
0063 #define is_cpu(vnd) (mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
0064 #define use_intel() (mtrr_if && mtrr_if->use_intel_if == 1)
0065
0066 extern unsigned int num_var_ranges;
0067 extern u64 mtrr_tom2;
0068 extern struct mtrr_state_type mtrr_state;
0069
0070 void mtrr_state_warn(void);
0071 const char *mtrr_attrib_to_str(int x);
0072 void mtrr_wrmsr(unsigned, unsigned, unsigned);
0073
0074 /* CPU specific mtrr init functions */
0075 int amd_init_mtrr(void);
0076 int cyrix_init_mtrr(void);
0077 int centaur_init_mtrr(void);
0078
0079 extern int changed_by_mtrr_cleanup;
0080 extern int mtrr_cleanup(unsigned address_bits);