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
13extern bool mtrr_debug;
14#define Dprintk(x...) do { if (mtrr_debug) pr_info(x); } while (0)
15
16extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
17
18struct 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
31extern int generic_get_free_region(unsigned long base, unsigned long size,
32 int replace_reg);
33extern int generic_validate_add_page(unsigned long base, unsigned long size,
34 unsigned int type);
35
36extern const struct mtrr_ops generic_mtrr_ops;
37
38extern int positive_have_wrcomb(void);
39
40/* library functions for processor-specific routines */
41struct set_mtrr_context {
42 unsigned long flags;
43 unsigned long cr4val;
44 u32 deftype_lo;
45 u32 deftype_hi;
46 u32 ccr3;
47};
48
49void set_mtrr_done(struct set_mtrr_context *ctxt);
50void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
51void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);
52
53void fill_mtrr_var_range(unsigned int index,
54 u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
55bool get_mtrr_state(void);
56
57extern const struct mtrr_ops *mtrr_if;
58extern struct mutex mtrr_mutex;
59
60extern unsigned int num_var_ranges;
61extern u64 mtrr_tom2;
62extern struct mtrr_state_type mtrr_state;
63extern u32 phys_hi_rsvd;
64
65void mtrr_state_warn(void);
66const char *mtrr_attrib_to_str(int x);
67void mtrr_wrmsr(unsigned, unsigned, unsigned);
68#ifdef CONFIG_X86_32
69void mtrr_set_if(void);
70void mtrr_register_syscore(void);
71#else
72static inline void mtrr_set_if(void) { }
73static inline void mtrr_register_syscore(void) { }
74#endif
75void mtrr_build_map(void);
76void mtrr_copy_map(void);
77
78/* CPU specific mtrr_ops vectors. */
79extern const struct mtrr_ops amd_mtrr_ops;
80extern const struct mtrr_ops cyrix_mtrr_ops;
81extern const struct mtrr_ops centaur_mtrr_ops;
82
83extern int changed_by_mtrr_cleanup;
84extern 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 */
90static inline bool mtrr_enabled(void)
91{
92 return !!mtrr_if;
93}
94void generic_rebuild_map(void);
95