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 struct mtrr_sentry { 33 unsigned long base; /* Base address */ 34 unsigned int size; /* Size of region */ 35 unsigned int type; /* Type of region */ 36 }; 37 38 /* Warning: this structure has a different order from i386 39 on x86-64. The 32bit emulation code takes care of that. 40 But you need to use this for 64bit, otherwise your X server 41 will break. */ 42 43 #ifdef __i386__ 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_gentry { 54 unsigned long base; /* Base address */ 55 unsigned int size; /* Size of region */ 56 unsigned int regnum; /* Register number */ 57 unsigned int type; /* Type of region */ 58 }; 59 #endif /* !__i386__ */ 60 61 struct mtrr_var_range { 62 __u32 base_lo; 63 __u32 base_hi; 64 __u32 mask_lo; 65 __u32 mask_hi; 66 }; 67 68 /* In the Intel processor's MTRR interface, the MTRR type is always held in 69 an 8 bit field: */ 70 typedef __u8 mtrr_type; 71 72 #define MTRR_NUM_FIXED_RANGES 88 73 #define MTRR_MAX_VAR_RANGES 256 74 75 struct mtrr_state_type { 76 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES]; 77 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES]; 78 unsigned char enabled; 79 unsigned char have_fixed; 80 mtrr_type def_type; 81 }; 82 83 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) 84 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) 85 86 /* These are the various ioctls */ 87 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry) 88 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry) 89 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry) 90 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry) 91 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry) 92 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry) 93 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry) 94 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry) 95 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry) 96 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry) 97 98 /* These are the region types */ 99 #define MTRR_TYPE_UNCACHABLE 0 100 #define MTRR_TYPE_WRCOMB 1 101 /*#define MTRR_TYPE_ 2*/ 102 /*#define MTRR_TYPE_ 3*/ 103 #define MTRR_TYPE_WRTHROUGH 4 104 #define MTRR_TYPE_WRPROT 5 105 #define MTRR_TYPE_WRBACK 6 106 #define MTRR_NUM_TYPES 7 107 108 #ifdef __KERNEL__ 109 110 /* The following functions are for use by other drivers */ 111 # ifdef CONFIG_MTRR 112 extern u8 mtrr_type_lookup(u64 addr, u64 end); 113 extern void mtrr_save_fixed_ranges(void *); 114 extern void mtrr_save_state(void); 115 extern int mtrr_add(unsigned long base, unsigned long size, 116 unsigned int type, bool increment); 117 extern int mtrr_add_page(unsigned long base, unsigned long size, 118 unsigned int type, bool increment); 119 extern int mtrr_del(int reg, unsigned long base, unsigned long size); 120 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 121 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 122 extern void mtrr_ap_init(void); 123 extern void mtrr_bp_init(void); 124 extern void set_mtrr_aps_delayed_init(void); 125 extern void mtrr_aps_init(void); 126 extern void mtrr_bp_restore(void); 127 extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 128 extern int amd_special_default_mtrr(void); 129 # else 130 static inline u8 mtrr_type_lookup(u64 addr, u64 end) 131 { 132 /* 133 * Return no-MTRRs: 134 */ 135 return 0xff; 136 } 137 #define mtrr_save_fixed_ranges(arg) do {} while (0) 138 #define mtrr_save_state() do {} while (0) 139 static inline int mtrr_add(unsigned long base, unsigned long size, 140 unsigned int type, bool increment) 141 { 142 return -ENODEV; 143 } 144 static inline int mtrr_add_page(unsigned long base, unsigned long size, 145 unsigned int type, bool increment) 146 { 147 return -ENODEV; 148 } 149 static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 150 { 151 return -ENODEV; 152 } 153 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 154 { 155 return -ENODEV; 156 } 157 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 158 { 159 return 0; 160 } 161 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) 162 { 163 } 164 165 #define mtrr_ap_init() do {} while (0) 166 #define mtrr_bp_init() do {} while (0) 167 #define set_mtrr_aps_delayed_init() do {} while (0) 168 #define mtrr_aps_init() do {} while (0) 169 #define mtrr_bp_restore() do {} while (0) 170 # endif 171 172 #ifdef CONFIG_COMPAT 173 #include <linux/compat.h> 174 175 struct mtrr_sentry32 { 176 compat_ulong_t base; /* Base address */ 177 compat_uint_t size; /* Size of region */ 178 compat_uint_t type; /* Type of region */ 179 }; 180 181 struct mtrr_gentry32 { 182 compat_ulong_t regnum; /* Register number */ 183 compat_uint_t base; /* Base address */ 184 compat_uint_t size; /* Size of region */ 185 compat_uint_t type; /* Type of region */ 186 }; 187 188 #define MTRR_IOCTL_BASE 'M' 189 190 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32) 191 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32) 192 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32) 193 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32) 194 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32) 195 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32) 196 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32) 197 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32) 198 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32) 199 #define MTRRIOC32_KILL_PAGE_ENTRY \ 200 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32) 201 #endif /* CONFIG_COMPAT */ 202 203 #endif /* __KERNEL__ */ 204 205 #endif /* _ASM_X86_MTRR_H */ 206