1 /* 2 * Generic MTRR (Memory Type Range Register) ioctls. 3 * Taken from the Linux kernel 4 * 5 * (C) Copyright 2012 6 * Graeme Russ, <graeme.russ@gmail.com> 7 * 8 * Copyright (C) 1997-1999 Richard Gooch <rgooch@atnf.csiro.au> 9 * 10 * SPDX-License-Identifier: GPL-2.0+ 11 */ 12 13 #ifndef _ASM_X86_MTRR_H 14 #define _ASM_X86_MTRR_H 15 16 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) 17 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) 18 19 #ifndef __ASSEMBLY__ 20 21 #include <linux/types.h> 22 #include <linux/ioctl.h> 23 #include <errno.h> 24 25 #define MTRR_IOCTL_BASE 'M' 26 27 struct mtrr_sentry { 28 unsigned long base; /* Base address */ 29 unsigned int size; /* Size of region */ 30 unsigned int type; /* Type of region */ 31 }; 32 33 /* 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 37 * will break. 38 */ 39 40 #ifdef __i386__ 41 struct mtrr_gentry { 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 */ 46 }; 47 48 #else /* __i386__ */ 49 50 struct mtrr_gentry { 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 */ 55 }; 56 #endif /* !__i386__ */ 57 58 struct mtrr_var_range { 59 __u32 base_lo; 60 __u32 base_hi; 61 __u32 mask_lo; 62 __u32 mask_hi; 63 }; 64 65 /* 66 * In the Intel processor's MTRR interface, the MTRR type is always held in 67 * an 8 bit field: 68 */ 69 typedef __u8 mtrr_type; 70 71 #define MTRR_NUM_FIXED_RANGES 88 72 #define MTRR_MAX_VAR_RANGES 256 73 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; 79 mtrr_type def_type; 80 }; 81 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) 93 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 7 103 104 #ifdef __KERNEL__ 105 106 /* The following functions are for use by other drivers */ 107 # ifdef CONFIG_MTRR 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); 125 # else 126 static inline u8 mtrr_type_lookup(u64 addr, u64 end) 127 { 128 /* 129 * Return no-MTRRs: 130 */ 131 return 0xff; 132 } 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) 136 { 137 return -ENODEV; 138 } 139 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 140 { 141 return -ENODEV; 142 } 143 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 144 { 145 return 0; 146 } 147 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) 148 { 149 } 150 151 #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) 156 # endif 157 158 #ifdef CONFIG_COMPAT 159 #include <linux/compat.h> 160 161 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 */ 165 }; 166 167 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 */ 172 }; 173 174 #define MTRR_IOCTL_BASE 'M' 175 176 #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 */ 188 189 #endif /* __KERNEL__ */ 190 191 #endif /* __ASSEMBLY__ */ 192 193 #endif /* _ASM_X86_MTRR_H */ 194