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
mtrr_set_if(void)72 static inline void mtrr_set_if(void) { }
mtrr_register_syscore(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 */
mtrr_enabled(void)90 static inline bool mtrr_enabled(void)
91 {
92 return !!mtrr_if;
93 }
94 void generic_rebuild_map(void);
95