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/bits.h> 27 #include <uapi/asm/mtrr.h> 28 29 /* Defines for hardware MTRR registers. */ 30 #define MTRR_CAP_VCNT GENMASK(7, 0) 31 #define MTRR_CAP_FIX BIT_MASK(8) 32 #define MTRR_CAP_WC BIT_MASK(10) 33 34 #define MTRR_DEF_TYPE_TYPE GENMASK(7, 0) 35 #define MTRR_DEF_TYPE_FE BIT_MASK(10) 36 #define MTRR_DEF_TYPE_E BIT_MASK(11) 37 38 #define MTRR_DEF_TYPE_ENABLE (MTRR_DEF_TYPE_FE | MTRR_DEF_TYPE_E) 39 #define MTRR_DEF_TYPE_DISABLE ~(MTRR_DEF_TYPE_TYPE | MTRR_DEF_TYPE_ENABLE) 40 41 #define MTRR_PHYSBASE_TYPE GENMASK(7, 0) 42 #define MTRR_PHYSBASE_RSVD GENMASK(11, 8) 43 44 #define MTRR_PHYSMASK_RSVD GENMASK(10, 0) 45 #define MTRR_PHYSMASK_V BIT_MASK(11) 46 47 struct mtrr_state_type { 48 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES]; 49 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES]; 50 unsigned char enabled; 51 bool have_fixed; 52 mtrr_type def_type; 53 }; 54 55 /* 56 * The following functions are for use by other drivers that cannot use 57 * arch_phys_wc_add and arch_phys_wc_del. 58 */ 59 # ifdef CONFIG_MTRR 60 void mtrr_bp_init(void); 61 void mtrr_overwrite_state(struct mtrr_var_range *var, unsigned int num_var, 62 mtrr_type def_type); 63 extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform); 64 extern void mtrr_save_fixed_ranges(void *); 65 extern void mtrr_save_state(void); 66 extern int mtrr_add(unsigned long base, unsigned long size, 67 unsigned int type, bool increment); 68 extern int mtrr_add_page(unsigned long base, unsigned long size, 69 unsigned int type, bool increment); 70 extern int mtrr_del(int reg, unsigned long base, unsigned long size); 71 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 72 extern void mtrr_bp_restore(void); 73 extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 74 extern int amd_special_default_mtrr(void); 75 void mtrr_disable(void); 76 void mtrr_enable(void); 77 void mtrr_generic_set_state(void); 78 # else 79 static inline void mtrr_overwrite_state(struct mtrr_var_range *var, 80 unsigned int num_var, 81 mtrr_type def_type) 82 { 83 } 84 85 static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform) 86 { 87 /* 88 * Return the default MTRR type, without any known other types in 89 * that range. 90 */ 91 *uniform = 1; 92 93 return MTRR_TYPE_UNCACHABLE; 94 } 95 #define mtrr_save_fixed_ranges(arg) do {} while (0) 96 #define mtrr_save_state() do {} while (0) 97 static inline int mtrr_add(unsigned long base, unsigned long size, 98 unsigned int type, bool increment) 99 { 100 return -ENODEV; 101 } 102 static inline int mtrr_add_page(unsigned long base, unsigned long size, 103 unsigned int type, bool increment) 104 { 105 return -ENODEV; 106 } 107 static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 108 { 109 return -ENODEV; 110 } 111 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 112 { 113 return -ENODEV; 114 } 115 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 116 { 117 return 0; 118 } 119 #define mtrr_bp_init() do {} while (0) 120 #define mtrr_bp_restore() do {} while (0) 121 #define mtrr_disable() do {} while (0) 122 #define mtrr_enable() do {} while (0) 123 #define mtrr_generic_set_state() do {} while (0) 124 # endif 125 126 #ifdef CONFIG_COMPAT 127 #include <linux/compat.h> 128 129 struct mtrr_sentry32 { 130 compat_ulong_t base; /* Base address */ 131 compat_uint_t size; /* Size of region */ 132 compat_uint_t type; /* Type of region */ 133 }; 134 135 struct mtrr_gentry32 { 136 compat_ulong_t regnum; /* Register number */ 137 compat_uint_t base; /* Base address */ 138 compat_uint_t size; /* Size of region */ 139 compat_uint_t type; /* Type of region */ 140 }; 141 142 #define MTRR_IOCTL_BASE 'M' 143 144 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32) 145 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32) 146 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32) 147 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32) 148 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32) 149 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32) 150 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32) 151 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32) 152 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32) 153 #define MTRRIOC32_KILL_PAGE_ENTRY \ 154 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32) 155 #endif /* CONFIG_COMPAT */ 156 157 /* Bit fields for enabled in struct mtrr_state_type */ 158 #define MTRR_STATE_SHIFT 10 159 #define MTRR_STATE_MTRR_FIXED_ENABLED (MTRR_DEF_TYPE_FE >> MTRR_STATE_SHIFT) 160 #define MTRR_STATE_MTRR_ENABLED (MTRR_DEF_TYPE_E >> MTRR_STATE_SHIFT) 161 162 #endif /* _ASM_X86_MTRR_H */ 163