arch/x86/kernel/cpu/mtrr/mtrr.h

/*
 * local mtrr defines.
 */

#include <linux/types.h>
#include <linux/stddef.h>

#define MTRRcap_MSR     0x0fe
#define MTRRdefType_MSR 0x2ff

#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)

#define NUM_FIXED_RANGES 88
#define MAX_VAR_RANGES 256
#define MTRRfix64K_00000_MSR 0x250
#define MTRRfix16K_80000_MSR 0x258
#define MTRRfix16K_A0000_MSR 0x259
#define MTRRfix4K_C0000_MSR 0x268
#define MTRRfix4K_C8000_MSR 0x269
#define MTRRfix4K_D0000_MSR 0x26a
#define MTRRfix4K_D8000_MSR 0x26b
#define MTRRfix4K_E0000_MSR 0x26c
#define MTRRfix4K_E8000_MSR 0x26d
#define MTRRfix4K_F0000_MSR 0x26e
#define MTRRfix4K_F8000_MSR 0x26f

#define MTRR_CHANGE_MASK_FIXED     0x01
#define MTRR_CHANGE_MASK_VARIABLE  0x02
#define MTRR_CHANGE_MASK_DEFTYPE   0x04

/* In the Intel processor's MTRR interface, the MTRR type is always held in
   an 8 bit field: */
typedef u8 mtrr_type;

extern unsigned int mtrr_usage_table[MAX_VAR_RANGES];

struct mtrr_ops {
	u32	vendor;
	u32	use_intel_if;
//	void	(*init)(void);
	void	(*set)(unsigned int reg, unsigned long base,
		       unsigned long size, mtrr_type type);
	void	(*set_all)(void);

	void	(*get)(unsigned int reg, unsigned long *base,
		       unsigned long *size, mtrr_type * type);
	int	(*get_free_region)(unsigned long base, unsigned long size,
				   int replace_reg);
	int	(*validate_add_page)(unsigned long base, unsigned long size,
				     unsigned int type);
	int	(*have_wrcomb)(void);
};

extern int generic_get_free_region(unsigned long base, unsigned long size,
				   int replace_reg);
extern int generic_validate_add_page(unsigned long base, unsigned long size,
				     unsigned int type);

extern struct mtrr_ops generic_mtrr_ops;

extern int positive_have_wrcomb(void);

/* library functions for processor-specific routines */
struct set_mtrr_context {
	unsigned long flags;
	unsigned long cr4val;
	u32 deftype_lo;
	u32 deftype_hi;
	u32 ccr3;
};

struct mtrr_var_range {
	u32 base_lo;
	u32 base_hi;
	u32 mask_lo;
	u32 mask_hi;
};

void set_mtrr_done(struct set_mtrr_context *ctxt);
void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);

void get_mtrr_state(void);

extern void set_mtrr_ops(struct mtrr_ops * ops);

extern u64 size_or_mask, size_and_mask;
extern struct mtrr_ops * mtrr_if;

#define is_cpu(vnd)	(mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
#define use_intel()	(mtrr_if && mtrr_if->use_intel_if == 1)

extern unsigned int num_var_ranges;

void mtrr_state_warn(void);
const char *mtrr_attrib_to_str(int x);
void mtrr_wrmsr(unsigned, unsigned, unsigned);

/* CPU specific mtrr init functions */
int amd_init_mtrr(void);
int cyrix_init_mtrr(void);
int centaur_init_mtrr(void);