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 <uapi/asm/mtrr.h> 27 28 /* 29 * The following functions are for use by other drivers that cannot use 30 * arch_phys_wc_add and arch_phys_wc_del. 31 */ 32 # ifdef CONFIG_MTRR 33 void mtrr_bp_init(void); 34 extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform); 35 extern void mtrr_save_fixed_ranges(void *); 36 extern void mtrr_save_state(void); 37 extern int mtrr_add(unsigned long base, unsigned long size, 38 unsigned int type, bool increment); 39 extern int mtrr_add_page(unsigned long base, unsigned long size, 40 unsigned int type, bool increment); 41 extern int mtrr_del(int reg, unsigned long base, unsigned long size); 42 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 43 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 44 extern void mtrr_bp_restore(void); 45 extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 46 extern int amd_special_default_mtrr(void); 47 void mtrr_disable(void); 48 void mtrr_enable(void); 49 void mtrr_generic_set_state(void); 50 # else 51 static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform) 52 { 53 /* 54 * Return no-MTRRs: 55 */ 56 return MTRR_TYPE_INVALID; 57 } 58 #define mtrr_save_fixed_ranges(arg) do {} while (0) 59 #define mtrr_save_state() do {} while (0) 60 static inline int mtrr_add(unsigned long base, unsigned long size, 61 unsigned int type, bool increment) 62 { 63 return -ENODEV; 64 } 65 static inline int mtrr_add_page(unsigned long base, unsigned long size, 66 unsigned int type, bool increment) 67 { 68 return -ENODEV; 69 } 70 static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 71 { 72 return -ENODEV; 73 } 74 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 75 { 76 return -ENODEV; 77 } 78 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 79 { 80 return 0; 81 } 82 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) 83 { 84 } 85 #define mtrr_bp_init() do {} while (0) 86 #define mtrr_bp_restore() do {} while (0) 87 #define mtrr_disable() do {} while (0) 88 #define mtrr_enable() do {} while (0) 89 #define mtrr_generic_set_state() do {} while (0) 90 # endif 91 92 #ifdef CONFIG_COMPAT 93 #include <linux/compat.h> 94 95 struct mtrr_sentry32 { 96 compat_ulong_t base; /* Base address */ 97 compat_uint_t size; /* Size of region */ 98 compat_uint_t type; /* Type of region */ 99 }; 100 101 struct mtrr_gentry32 { 102 compat_ulong_t regnum; /* Register number */ 103 compat_uint_t base; /* Base address */ 104 compat_uint_t size; /* Size of region */ 105 compat_uint_t type; /* Type of region */ 106 }; 107 108 #define MTRR_IOCTL_BASE 'M' 109 110 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32) 111 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32) 112 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32) 113 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32) 114 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32) 115 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32) 116 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32) 117 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32) 118 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32) 119 #define MTRRIOC32_KILL_PAGE_ENTRY \ 120 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32) 121 #endif /* CONFIG_COMPAT */ 122 123 /* Bit fields for enabled in struct mtrr_state_type */ 124 #define MTRR_STATE_MTRR_FIXED_ENABLED 0x01 125 #define MTRR_STATE_MTRR_ENABLED 0x02 126 127 #endif /* _ASM_X86_MTRR_H */ 128