2 * Generic MTRR (Memory Type Range Register) ioctls.
3 * Taken from the Linux kernel
6 * Graeme Russ, <graeme.russ@gmail.com>
8 * Copyright (C) 1997-1999 Richard Gooch <rgooch@atnf.csiro.au>
10 * SPDX-License-Identifier: GPL-2.0+
13 #ifndef _ASM_X86_MTRR_H
14 #define _ASM_X86_MTRR_H
16 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
17 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
21 #include <linux/types.h>
22 #include <linux/ioctl.h>
25 #define MTRR_IOCTL_BASE 'M'
28 unsigned long base; /* Base address */
29 unsigned int size; /* Size of region */
30 unsigned int type; /* Type of region */
34 * Warning: this structure has a different order from i386
35 * on x86-64. The 32bit emulation code takes care of that.
36 * But you need to use this for 64bit, otherwise your X server
42 unsigned int regnum; /* Register number */
43 unsigned long base; /* Base address */
44 unsigned int size; /* Size of region */
45 unsigned int type; /* Type of region */
51 unsigned long base; /* Base address */
52 unsigned int size; /* Size of region */
53 unsigned int regnum; /* Register number */
54 unsigned int type; /* Type of region */
56 #endif /* !__i386__ */
58 struct mtrr_var_range {
66 * In the Intel processor's MTRR interface, the MTRR type is always held in
69 typedef __u8 mtrr_type;
71 #define MTRR_NUM_FIXED_RANGES 88
72 #define MTRR_MAX_VAR_RANGES 256
74 struct mtrr_state_type {
75 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
76 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
77 unsigned char enabled;
78 unsigned char have_fixed;
82 /* These are the various ioctls */
83 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
84 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry)
85 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry)
86 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry)
87 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry)
88 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry)
89 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry)
90 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry)
91 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry)
92 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry)
94 /* These are the region types */
95 #define MTRR_TYPE_UNCACHABLE 0
96 #define MTRR_TYPE_WRCOMB 1
97 /*#define MTRR_TYPE_ 2*/
98 /*#define MTRR_TYPE_ 3*/
99 #define MTRR_TYPE_WRTHROUGH 4
100 #define MTRR_TYPE_WRPROT 5
101 #define MTRR_TYPE_WRBACK 6
102 #define MTRR_NUM_TYPES 7
106 /* The following functions are for use by other drivers */
108 extern u8 mtrr_type_lookup(u64 addr, u64 end);
109 extern void mtrr_save_fixed_ranges(void *);
110 extern void mtrr_save_state(void);
111 extern int mtrr_add(unsigned long base, unsigned long size,
112 unsigned int type, bool increment);
113 extern int mtrr_add_page(unsigned long base, unsigned long size,
114 unsigned int type, bool increment);
115 extern int mtrr_del(int reg, unsigned long base, unsigned long size);
116 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
117 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
118 extern void mtrr_ap_init(void);
119 extern void mtrr_bp_init(void);
120 extern void set_mtrr_aps_delayed_init(void);
121 extern void mtrr_aps_init(void);
122 extern void mtrr_bp_restore(void);
123 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
124 extern int amd_special_default_mtrr(void);
126 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
133 #define mtrr_save_fixed_ranges(arg) do {} while (0)
134 #define mtrr_save_state() do {} while (0)
135 static inline int mtrr_del(int reg, unsigned long base, unsigned long size)
139 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size)
143 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
147 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
151 #define mtrr_ap_init() do {} while (0)
152 #define mtrr_bp_init() do {} while (0)
153 #define set_mtrr_aps_delayed_init() do {} while (0)
154 #define mtrr_aps_init() do {} while (0)
155 #define mtrr_bp_restore() do {} while (0)
159 #include <linux/compat.h>
161 struct mtrr_sentry32 {
162 compat_ulong_t base; /* Base address */
163 compat_uint_t size; /* Size of region */
164 compat_uint_t type; /* Type of region */
167 struct mtrr_gentry32 {
168 compat_ulong_t regnum; /* Register number */
169 compat_uint_t base; /* Base address */
170 compat_uint_t size; /* Size of region */
171 compat_uint_t type; /* Type of region */
174 #define MTRR_IOCTL_BASE 'M'
176 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32)
177 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32)
178 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32)
179 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32)
180 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32)
181 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32)
182 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32)
183 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32)
184 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32)
185 #define MTRRIOC32_KILL_PAGE_ENTRY \
186 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32)
187 #endif /* CONFIG_COMPAT */
189 #endif /* __KERNEL__ */
191 #endif /* __ASSEMBLY__ */
193 #endif /* _ASM_X86_MTRR_H */