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 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 */ 25 26 #ifndef _ASM_X86_MTRR_H 27 #define _ASM_X86_MTRR_H 28 29 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) 30 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) 31 32 #ifndef __ASSEMBLY__ 33 34 #include <linux/types.h> 35 #include <linux/ioctl.h> 36 #include <errno.h> 37 38 #define MTRR_IOCTL_BASE 'M' 39 40 struct mtrr_sentry { 41 unsigned long base; /* Base address */ 42 unsigned int size; /* Size of region */ 43 unsigned int type; /* Type of region */ 44 }; 45 46 /* 47 * Warning: this structure has a different order from i386 48 * on x86-64. The 32bit emulation code takes care of that. 49 * But you need to use this for 64bit, otherwise your X server 50 * will break. 51 */ 52 53 #ifdef __i386__ 54 struct mtrr_gentry { 55 unsigned int regnum; /* Register number */ 56 unsigned long base; /* Base address */ 57 unsigned int size; /* Size of region */ 58 unsigned int type; /* Type of region */ 59 }; 60 61 #else /* __i386__ */ 62 63 struct mtrr_gentry { 64 unsigned long base; /* Base address */ 65 unsigned int size; /* Size of region */ 66 unsigned int regnum; /* Register number */ 67 unsigned int type; /* Type of region */ 68 }; 69 #endif /* !__i386__ */ 70 71 struct mtrr_var_range { 72 __u32 base_lo; 73 __u32 base_hi; 74 __u32 mask_lo; 75 __u32 mask_hi; 76 }; 77 78 /* 79 * In the Intel processor's MTRR interface, the MTRR type is always held in 80 * an 8 bit field: 81 */ 82 typedef __u8 mtrr_type; 83 84 #define MTRR_NUM_FIXED_RANGES 88 85 #define MTRR_MAX_VAR_RANGES 256 86 87 struct mtrr_state_type { 88 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES]; 89 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES]; 90 unsigned char enabled; 91 unsigned char have_fixed; 92 mtrr_type def_type; 93 }; 94 95 /* These are the various ioctls */ 96 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry) 97 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry) 98 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry) 99 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry) 100 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry) 101 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry) 102 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry) 103 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry) 104 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry) 105 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry) 106 107 /* These are the region types */ 108 #define MTRR_TYPE_UNCACHABLE 0 109 #define MTRR_TYPE_WRCOMB 1 110 /*#define MTRR_TYPE_ 2*/ 111 /*#define MTRR_TYPE_ 3*/ 112 #define MTRR_TYPE_WRTHROUGH 4 113 #define MTRR_TYPE_WRPROT 5 114 #define MTRR_TYPE_WRBACK 6 115 #define MTRR_NUM_TYPES 7 116 117 #ifdef __KERNEL__ 118 119 /* The following functions are for use by other drivers */ 120 # ifdef CONFIG_MTRR 121 extern u8 mtrr_type_lookup(u64 addr, u64 end); 122 extern void mtrr_save_fixed_ranges(void *); 123 extern void mtrr_save_state(void); 124 extern int mtrr_add(unsigned long base, unsigned long size, 125 unsigned int type, bool increment); 126 extern int mtrr_add_page(unsigned long base, unsigned long size, 127 unsigned int type, bool increment); 128 extern int mtrr_del(int reg, unsigned long base, unsigned long size); 129 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 130 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 131 extern void mtrr_ap_init(void); 132 extern void mtrr_bp_init(void); 133 extern void set_mtrr_aps_delayed_init(void); 134 extern void mtrr_aps_init(void); 135 extern void mtrr_bp_restore(void); 136 extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 137 extern int amd_special_default_mtrr(void); 138 # else 139 static inline u8 mtrr_type_lookup(u64 addr, u64 end) 140 { 141 /* 142 * Return no-MTRRs: 143 */ 144 return 0xff; 145 } 146 #define mtrr_save_fixed_ranges(arg) do {} while (0) 147 #define mtrr_save_state() do {} while (0) 148 static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 149 { 150 return -ENODEV; 151 } 152 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 153 { 154 return -ENODEV; 155 } 156 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 157 { 158 return 0; 159 } 160 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) 161 { 162 } 163 164 #define mtrr_ap_init() do {} while (0) 165 #define mtrr_bp_init() do {} while (0) 166 #define set_mtrr_aps_delayed_init() do {} while (0) 167 #define mtrr_aps_init() do {} while (0) 168 #define mtrr_bp_restore() do {} while (0) 169 # endif 170 171 #ifdef CONFIG_COMPAT 172 #include <linux/compat.h> 173 174 struct mtrr_sentry32 { 175 compat_ulong_t base; /* Base address */ 176 compat_uint_t size; /* Size of region */ 177 compat_uint_t type; /* Type of region */ 178 }; 179 180 struct mtrr_gentry32 { 181 compat_ulong_t regnum; /* Register number */ 182 compat_uint_t base; /* Base address */ 183 compat_uint_t size; /* Size of region */ 184 compat_uint_t type; /* Type of region */ 185 }; 186 187 #define MTRR_IOCTL_BASE 'M' 188 189 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32) 190 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32) 191 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32) 192 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32) 193 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32) 194 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32) 195 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32) 196 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32) 197 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32) 198 #define MTRRIOC32_KILL_PAGE_ENTRY \ 199 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32) 200 #endif /* CONFIG_COMPAT */ 201 202 #endif /* __KERNEL__ */ 203 204 #endif /* __ASSEMBLY__ */ 205 206 #endif /* _ASM_X86_MTRR_H */ 207