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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/kernel/cpu/mtrr/mtrr.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * local MTRR defines.

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 */

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#include <linux/types.h>

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#include <linux/stddef.h>

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#define MTRR_CHANGE_MASK_FIXED     0x01

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#define MTRR_CHANGE_MASK_VARIABLE  0x02

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#define MTRR_CHANGE_MASK_DEFTYPE   0x04

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extern bool mtrr_debug;

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#define Dprintk(x...) do { if (mtrr_debug) pr_info(x); } while (0)

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extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];

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struct mtrr_ops {

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	u32	var_regs;

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	void	(*set)(unsigned int reg, unsigned long base,

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		       unsigned long size, mtrr_type type);

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	void	(*get)(unsigned int reg, unsigned long *base,

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		       unsigned long *size, mtrr_type *type);

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	int	(*get_free_region)(unsigned long base, unsigned long size,

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				   int replace_reg);

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	int	(*validate_add_page)(unsigned long base, unsigned long size,

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				     unsigned int type);

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	int	(*have_wrcomb)(void);

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};

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extern int generic_get_free_region(unsigned long base, unsigned long size,

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				   int replace_reg);

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extern int generic_validate_add_page(unsigned long base, unsigned long size,

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				     unsigned int type);

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extern const struct mtrr_ops generic_mtrr_ops;

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extern int positive_have_wrcomb(void);

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/* library functions for processor-specific routines */

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struct set_mtrr_context {

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	unsigned long	flags;

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	unsigned long	cr4val;

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	u32		deftype_lo;

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	u32		deftype_hi;

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	u32		ccr3;

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};

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void fill_mtrr_var_range(unsigned int index,

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		u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);

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bool get_mtrr_state(void);

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extern const struct mtrr_ops *mtrr_if;

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extern struct mutex mtrr_mutex;

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extern unsigned int num_var_ranges;

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extern u64 mtrr_tom2;

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extern struct mtrr_state_type mtrr_state;

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extern u32 phys_hi_rsvd;

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void mtrr_state_warn(void);

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const char *mtrr_attrib_to_str(int x);

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void mtrr_wrmsr(unsigned, unsigned, unsigned);

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#ifdef CONFIG_X86_32

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void mtrr_set_if(void);

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void mtrr_register_syscore(void);

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#else

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static inline void mtrr_set_if(void) { }

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static inline void mtrr_register_syscore(void) { }

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#endif

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void mtrr_build_map(void);

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void mtrr_copy_map(void);

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/* CPU specific mtrr_ops vectors. */

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extern const struct mtrr_ops amd_mtrr_ops;

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extern const struct mtrr_ops cyrix_mtrr_ops;

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extern const struct mtrr_ops centaur_mtrr_ops;

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extern int changed_by_mtrr_cleanup;

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extern int mtrr_cleanup(void);

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/*

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 * Must be used by code which uses mtrr_if to call platform-specific

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 * MTRR manipulation functions.

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 */

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static inline bool mtrr_enabled(void)

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{

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	return !!mtrr_if;

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}

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void generic_rebuild_map(void);

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