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/ioctl.h> 27 #include <linux/errno.h> 28 29 #define MTRR_IOCTL_BASE 'M' 30 31 struct mtrr_sentry { 32 unsigned long base; /* Base address */ 33 unsigned int size; /* Size of region */ 34 unsigned int type; /* Type of region */ 35 }; 36 37 /* Warning: this structure has a different order from i386 38 on x86-64. The 32bit emulation code takes care of that. 39 But you need to use this for 64bit, otherwise your X server 40 will break. */ 41 42 #ifdef __i386__ 43 struct mtrr_gentry { 44 unsigned int regnum; /* Register number */ 45 unsigned long base; /* Base address */ 46 unsigned int size; /* Size of region */ 47 unsigned int type; /* Type of region */ 48 }; 49 50 #else /* __i386__ */ 51 52 struct mtrr_gentry { 53 unsigned long base; /* Base address */ 54 unsigned int size; /* Size of region */ 55 unsigned int regnum; /* Register number */ 56 unsigned int type; /* Type of region */ 57 }; 58 #endif /* !__i386__ */ 59 60 /* These are the various ioctls */ 61 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry) 62 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry) 63 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry) 64 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry) 65 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry) 66 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry) 67 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry) 68 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry) 69 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry) 70 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry) 71 72 /* These are the region types */ 73 #define MTRR_TYPE_UNCACHABLE 0 74 #define MTRR_TYPE_WRCOMB 1 75 /*#define MTRR_TYPE_ 2*/ 76 /*#define MTRR_TYPE_ 3*/ 77 #define MTRR_TYPE_WRTHROUGH 4 78 #define MTRR_TYPE_WRPROT 5 79 #define MTRR_TYPE_WRBACK 6 80 #define MTRR_NUM_TYPES 7 81 82 #ifdef __KERNEL__ 83 84 /* The following functions are for use by other drivers */ 85 # ifdef CONFIG_MTRR 86 extern u8 mtrr_type_lookup(u64 addr, u64 end); 87 extern void mtrr_save_fixed_ranges(void *); 88 extern void mtrr_save_state(void); 89 extern int mtrr_add(unsigned long base, unsigned long size, 90 unsigned int type, bool increment); 91 extern int mtrr_add_page(unsigned long base, unsigned long size, 92 unsigned int type, bool increment); 93 extern int mtrr_del(int reg, unsigned long base, unsigned long size); 94 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 95 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 96 extern void mtrr_ap_init(void); 97 extern void mtrr_bp_init(void); 98 extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 99 extern int amd_special_default_mtrr(void); 100 # else 101 static inline u8 mtrr_type_lookup(u64 addr, u64 end) 102 { 103 /* 104 * Return no-MTRRs: 105 */ 106 return 0xff; 107 } 108 #define mtrr_save_fixed_ranges(arg) do {} while (0) 109 #define mtrr_save_state() do {} while (0) 110 static inline int mtrr_add(unsigned long base, unsigned long size, 111 unsigned int type, bool increment) 112 { 113 return -ENODEV; 114 } 115 static inline int mtrr_add_page(unsigned long base, unsigned long size, 116 unsigned int type, bool increment) 117 { 118 return -ENODEV; 119 } 120 static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 121 { 122 return -ENODEV; 123 } 124 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 125 { 126 return -ENODEV; 127 } 128 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 129 { 130 return 0; 131 } 132 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) 133 { 134 } 135 136 #define mtrr_ap_init() do {} while (0) 137 #define mtrr_bp_init() do {} while (0) 138 # endif 139 140 #ifdef CONFIG_COMPAT 141 #include <linux/compat.h> 142 143 struct mtrr_sentry32 { 144 compat_ulong_t base; /* Base address */ 145 compat_uint_t size; /* Size of region */ 146 compat_uint_t type; /* Type of region */ 147 }; 148 149 struct mtrr_gentry32 { 150 compat_ulong_t regnum; /* Register number */ 151 compat_uint_t base; /* Base address */ 152 compat_uint_t size; /* Size of region */ 153 compat_uint_t type; /* Type of region */ 154 }; 155 156 #define MTRR_IOCTL_BASE 'M' 157 158 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32) 159 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32) 160 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32) 161 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32) 162 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32) 163 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32) 164 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32) 165 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32) 166 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32) 167 #define MTRRIOC32_KILL_PAGE_ENTRY \ 168 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32) 169 #endif /* CONFIG_COMPAT */ 170 171 #endif /* __KERNEL__ */ 172 173 #endif /* _ASM_X86_MTRR_H */ 174