3b9cfc0a99
This is part of the ops structure constification effort started by Arjan van de Ven et al. Benefits of this constification: * prevents modification of data that is shared (referenced) by many other structure instances at runtime * detects/prevents accidental (but not intentional) modification attempts on archs that enforce read-only kernel data at runtime * potentially better optimized code as the compiler can assume that the const data cannot be changed * the compiler/linker move const data into .rodata and therefore exclude them from false sharing Signed-off-by: Emese Revfy <re.emese@gmail.com> LKML-Reference: <4B65D712.3080804@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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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 unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
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struct mtrr_ops {
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u32 vendor;
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u32 use_intel_if;
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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 (*set_all)(void);
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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 set_mtrr_done(struct set_mtrr_context *ctxt);
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void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
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void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);
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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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void get_mtrr_state(void);
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extern void set_mtrr_ops(const struct mtrr_ops *ops);
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extern u64 size_or_mask, size_and_mask;
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extern const struct mtrr_ops *mtrr_if;
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#define is_cpu(vnd) (mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
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#define use_intel() (mtrr_if && mtrr_if->use_intel_if == 1)
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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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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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/* CPU specific mtrr init functions */
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int amd_init_mtrr(void);
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int cyrix_init_mtrr(void);
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int centaur_init_mtrr(void);
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extern int changed_by_mtrr_cleanup;
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extern int mtrr_cleanup(unsigned address_bits);
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