xref: /openbmc/linux/arch/x86/kernel/cpu/mtrr/mtrr.h (revision 9ac8d3fb)
1 /*
2  * local mtrr defines.
3  */
4 
5 #include <linux/types.h>
6 #include <linux/stddef.h>
7 
8 #define MTRRcap_MSR     0x0fe
9 #define MTRRdefType_MSR 0x2ff
10 
11 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
12 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
13 
14 #define NUM_FIXED_RANGES 88
15 #define MAX_VAR_RANGES 256
16 #define MTRRfix64K_00000_MSR 0x250
17 #define MTRRfix16K_80000_MSR 0x258
18 #define MTRRfix16K_A0000_MSR 0x259
19 #define MTRRfix4K_C0000_MSR 0x268
20 #define MTRRfix4K_C8000_MSR 0x269
21 #define MTRRfix4K_D0000_MSR 0x26a
22 #define MTRRfix4K_D8000_MSR 0x26b
23 #define MTRRfix4K_E0000_MSR 0x26c
24 #define MTRRfix4K_E8000_MSR 0x26d
25 #define MTRRfix4K_F0000_MSR 0x26e
26 #define MTRRfix4K_F8000_MSR 0x26f
27 
28 #define MTRR_CHANGE_MASK_FIXED     0x01
29 #define MTRR_CHANGE_MASK_VARIABLE  0x02
30 #define MTRR_CHANGE_MASK_DEFTYPE   0x04
31 
32 /* In the Intel processor's MTRR interface, the MTRR type is always held in
33    an 8 bit field: */
34 typedef u8 mtrr_type;
35 
36 extern unsigned int mtrr_usage_table[MAX_VAR_RANGES];
37 
38 struct mtrr_ops {
39 	u32	vendor;
40 	u32	use_intel_if;
41 //	void	(*init)(void);
42 	void	(*set)(unsigned int reg, unsigned long base,
43 		       unsigned long size, mtrr_type type);
44 	void	(*set_all)(void);
45 
46 	void	(*get)(unsigned int reg, unsigned long *base,
47 		       unsigned long *size, mtrr_type * type);
48 	int	(*get_free_region)(unsigned long base, unsigned long size,
49 				   int replace_reg);
50 	int	(*validate_add_page)(unsigned long base, unsigned long size,
51 				     unsigned int type);
52 	int	(*have_wrcomb)(void);
53 };
54 
55 extern int generic_get_free_region(unsigned long base, unsigned long size,
56 				   int replace_reg);
57 extern int generic_validate_add_page(unsigned long base, unsigned long size,
58 				     unsigned int type);
59 
60 extern struct mtrr_ops generic_mtrr_ops;
61 
62 extern int positive_have_wrcomb(void);
63 
64 /* library functions for processor-specific routines */
65 struct set_mtrr_context {
66 	unsigned long flags;
67 	unsigned long cr4val;
68 	u32 deftype_lo;
69 	u32 deftype_hi;
70 	u32 ccr3;
71 };
72 
73 struct mtrr_var_range {
74 	u32 base_lo;
75 	u32 base_hi;
76 	u32 mask_lo;
77 	u32 mask_hi;
78 };
79 
80 void set_mtrr_done(struct set_mtrr_context *ctxt);
81 void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
82 void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);
83 
84 void fill_mtrr_var_range(unsigned int index,
85 		u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
86 void get_mtrr_state(void);
87 
88 extern void set_mtrr_ops(struct mtrr_ops * ops);
89 
90 extern u64 size_or_mask, size_and_mask;
91 extern struct mtrr_ops * mtrr_if;
92 
93 #define is_cpu(vnd)	(mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
94 #define use_intel()	(mtrr_if && mtrr_if->use_intel_if == 1)
95 
96 extern unsigned int num_var_ranges;
97 extern u64 mtrr_tom2;
98 
99 void mtrr_state_warn(void);
100 const char *mtrr_attrib_to_str(int x);
101 void mtrr_wrmsr(unsigned, unsigned, unsigned);
102 
103 /* CPU specific mtrr init functions */
104 int amd_init_mtrr(void);
105 int cyrix_init_mtrr(void);
106 int centaur_init_mtrr(void);
107