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 #include <asm/pat.h> 28 29 30 /* 31 * The following functions are for use by other drivers that cannot use 32 * arch_phys_wc_add and arch_phys_wc_del. 33 */ 34 # ifdef CONFIG_MTRR 35 extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform); 36 extern void mtrr_save_fixed_ranges(void *); 37 extern void mtrr_save_state(void); 38 extern int mtrr_add(unsigned long base, unsigned long size, 39 unsigned int type, bool increment); 40 extern int mtrr_add_page(unsigned long base, unsigned long size, 41 unsigned int type, bool increment); 42 extern int mtrr_del(int reg, unsigned long base, unsigned long size); 43 extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 44 extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 45 extern void mtrr_ap_init(void); 46 extern void mtrr_bp_init(void); 47 extern void set_mtrr_aps_delayed_init(void); 48 extern void mtrr_aps_init(void); 49 extern void mtrr_bp_restore(void); 50 extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 51 extern int amd_special_default_mtrr(void); 52 # else 53 static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform) 54 { 55 /* 56 * Return no-MTRRs: 57 */ 58 return MTRR_TYPE_INVALID; 59 } 60 #define mtrr_save_fixed_ranges(arg) do {} while (0) 61 #define mtrr_save_state() do {} while (0) 62 static inline int mtrr_add(unsigned long base, unsigned long size, 63 unsigned int type, bool increment) 64 { 65 return -ENODEV; 66 } 67 static inline int mtrr_add_page(unsigned long base, unsigned long size, 68 unsigned int type, bool increment) 69 { 70 return -ENODEV; 71 } 72 static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 73 { 74 return -ENODEV; 75 } 76 static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 77 { 78 return -ENODEV; 79 } 80 static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 81 { 82 return 0; 83 } 84 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) 85 { 86 } 87 static inline void mtrr_bp_init(void) 88 { 89 pat_disable("MTRRs disabled, skipping PAT initialization too."); 90 } 91 92 #define mtrr_ap_init() do {} while (0) 93 #define set_mtrr_aps_delayed_init() do {} while (0) 94 #define mtrr_aps_init() do {} while (0) 95 #define mtrr_bp_restore() do {} while (0) 96 # endif 97 98 #ifdef CONFIG_COMPAT 99 #include <linux/compat.h> 100 101 struct mtrr_sentry32 { 102 compat_ulong_t base; /* Base address */ 103 compat_uint_t size; /* Size of region */ 104 compat_uint_t type; /* Type of region */ 105 }; 106 107 struct mtrr_gentry32 { 108 compat_ulong_t regnum; /* Register number */ 109 compat_uint_t base; /* Base address */ 110 compat_uint_t size; /* Size of region */ 111 compat_uint_t type; /* Type of region */ 112 }; 113 114 #define MTRR_IOCTL_BASE 'M' 115 116 #define MTRRIOC32_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry32) 117 #define MTRRIOC32_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry32) 118 #define MTRRIOC32_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry32) 119 #define MTRRIOC32_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry32) 120 #define MTRRIOC32_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry32) 121 #define MTRRIOC32_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry32) 122 #define MTRRIOC32_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry32) 123 #define MTRRIOC32_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry32) 124 #define MTRRIOC32_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry32) 125 #define MTRRIOC32_KILL_PAGE_ENTRY \ 126 _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry32) 127 #endif /* CONFIG_COMPAT */ 128 129 /* Bit fields for enabled in struct mtrr_state_type */ 130 #define MTRR_STATE_MTRR_FIXED_ENABLED 0x01 131 #define MTRR_STATE_MTRR_ENABLED 0x02 132 133 #endif /* _ASM_X86_MTRR_H */ 134