1 /* Generic MTRR (Memory Type Range Register) ioctls. 2 3 Copyright (C) 1997-1999 Richard Gooch 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Library General Public 7 License as published by the Free Software Foundation; either 8 version 2 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Library General Public License for more details. 14 15 You should have received a copy of the GNU Library General Public 16 License along with this library; if not, write to the Free 17 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 19 Richard Gooch may be reached by email at rgooch@atnf.csiro.au 20 The postal address is: 21 Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia. 22 */ 23 #ifndef _ASM_X86_MTRR_H 24 #define _ASM_X86_MTRR_H 25 26 #include <linux/types.h> 27 #include <linux/ioctl.h> 28 #include <linux/errno.h> 29 30 #define MTRR_IOCTL_BASE 'M' 31 32 /* Warning: this structure has a different order from i386 33 on x86-64. The 32bit emulation code takes care of that. 34 But you need to use this for 64bit, otherwise your X server 35 will break. */ 36 37 #ifdef __i386__ 38 struct mtrr_sentry { 39 unsigned long base; /* Base address */ 40 unsigned int size; /* Size of region */ 41 unsigned int type; /* Type of region */ 42 }; 43 44 struct mtrr_gentry { 45 unsigned int regnum; /* Register number */ 46 unsigned long base; /* Base address */ 47 unsigned int size; /* Size of region */ 48 unsigned int type; /* Type of region */ 49 }; 50 51 #else /* __i386__ */ 52 53 struct mtrr_sentry { 54 __u64 base; /* Base address */ 55 __u32 size; /* Size of region */ 56 __u32 type; /* Type of region */ 57 }; 58 59 struct mtrr_gentry { 60 __u64 base; /* Base address */ 61 __u32 size; /* Size of region */ 62 __u32 regnum; /* Register number */ 63 __u32 type; /* Type of region */ 64 __u32 _pad; /* Unused */ 65 }; 66 67 #endif /* !__i386__ */ 68 69 struct mtrr_var_range { 70 __u32 base_lo; 71 __u32 base_hi; 72 __u32 mask_lo; 73 __u32 mask_hi; 74 }; 75 76 /* In the Intel processor's MTRR interface, the MTRR type is always held in 77 an 8 bit field: */ 78 typedef __u8 mtrr_type; 79 80 #define MTRR_NUM_FIXED_RANGES 88 81 #define MTRR_MAX_VAR_RANGES 256 82 83 struct mtrr_state_type { 84 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES]; 85 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES]; 86 unsigned char enabled; 87 unsigned char have_fixed; 88 mtrr_type def_type; 89 }; 90 91 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) 92 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) 93 94 /* These are the various ioctls */ 95 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry) 96 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry) 97 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry) 98 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry) 99 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry) 100 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry) 101 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry) 102 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry) 103 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry) 104 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry) 105 106 /* These are the region types */ 107 #define MTRR_TYPE_UNCACHABLE 0 108 #define MTRR_TYPE_WRCOMB 1 109 /*#define MTRR_TYPE_ 2*/ 110 /*#define MTRR_TYPE_ 3*/ 111 #define MTRR_TYPE_WRTHROUGH 4 112 #define MTRR_TYPE_WRPROT 5 113 #define MTRR_TYPE_WRBACK 6 114 #define MTRR_NUM_TYPES 7 115 116 #ifdef __KERNEL__ 117 118 /* The following functions are for use by other drivers */ 119 # ifdef CONFIG_MTRR 120 extern u8 mtrr_type_lookup(u64 addr, u64 end); 121 extern void mtrr_save_fixed_ranges(void *); 122 extern void mtrr_save_state(void); 123 extern int mtrr_add(unsigned long base, unsigned long size, 124 unsigned int type, bool increment); 125 extern int mtrr_add_page(unsigned long base, unsigned long size, 126 unsigned int type, bool increment); 127 extern int mtrr_del(int reg, unsigned long base, unsigned long size); 128 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 129 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 130 extern void mtrr_ap_init(void); 131 extern void mtrr_bp_init(void); 132 extern void set_mtrr_aps_delayed_init(void); 133 extern void mtrr_aps_init(void); 134 extern void mtrr_bp_restore(void); 135 extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 136 extern int amd_special_default_mtrr(void); 137 # else 138 static inline u8 mtrr_type_lookup(u64 addr, u64 end) 139 { 140 /* 141 * Return no-MTRRs: 142 */ 143 return 0xff; 144 } 145 #define mtrr_save_fixed_ranges(arg) do {} while (0) 146 #define mtrr_save_state() do {} while (0) 147 static inline int mtrr_add(unsigned long base, unsigned long size, 148 unsigned int type, bool increment) 149 { 150 return -ENODEV; 151 } 152 static inline int mtrr_add_page(unsigned long base, unsigned long size, 153 unsigned int type, bool increment) 154 { 155 return -ENODEV; 156 } 157 static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 158 { 159 return -ENODEV; 160 } 161 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 162 { 163 return -ENODEV; 164 } 165 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 166 { 167 return 0; 168 } 169 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) 170 { 171 } 172 173 #define mtrr_ap_init() do {} while (0) 174 #define mtrr_bp_init() do {} while (0) 175 #define set_mtrr_aps_delayed_init() do {} while (0) 176 #define mtrr_aps_init() do {} while (0) 177 #define mtrr_bp_restore() do {} while (0) 178 # endif 179 180 #ifdef CONFIG_COMPAT 181 #include <linux/compat.h> 182 183 struct mtrr_sentry32 { 184 compat_ulong_t base; /* Base address */ 185 compat_uint_t size; /* Size of region */ 186 compat_uint_t type; /* Type of region */ 187 }; 188 189 struct mtrr_gentry32 { 190 compat_ulong_t regnum; /* Register number */ 191 compat_uint_t base; /* Base address */ 192 compat_uint_t size; /* Size of region */ 193 compat_uint_t type; /* Type of region */ 194 }; 195 196 #define MTRR_IOCTL_BASE 'M' 197 198 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32) 199 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32) 200 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32) 201 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32) 202 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32) 203 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32) 204 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32) 205 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32) 206 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32) 207 #define MTRRIOC32_KILL_PAGE_ENTRY \ 208 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32) 209 #endif /* CONFIG_COMPAT */ 210 211 #endif /* __KERNEL__ */ 212 213 #endif /* _ASM_X86_MTRR_H */ 214