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 32struct 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__ 44struct 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 53struct 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 61struct 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: */ 70typedef __u8 mtrr_type; 71 72#define MTRR_NUM_FIXED_RANGES 88 73#define MTRR_MAX_VAR_RANGES 256 74 75struct 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 112extern u8 mtrr_type_lookup(u64 addr, u64 end); 113extern void mtrr_save_fixed_ranges(void *); 114extern void mtrr_save_state(void); 115extern int mtrr_add(unsigned long base, unsigned long size, 116 unsigned int type, bool increment); 117extern int mtrr_add_page(unsigned long base, unsigned long size, 118 unsigned int type, bool increment); 119extern int mtrr_del(int reg, unsigned long base, unsigned long size); 120extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 121extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 122extern void mtrr_ap_init(void); 123extern void mtrr_bp_init(void); 124extern void set_mtrr_aps_delayed_init(void); 125extern void mtrr_aps_init(void); 126extern void mtrr_bp_restore(void); 127extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 128extern int amd_special_default_mtrr(void); 129# else 130static 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) 139static inline int mtrr_add(unsigned long base, unsigned long size, 140 unsigned int type, bool increment) 141{ 142 return -ENODEV; 143} 144static inline int mtrr_add_page(unsigned long base, unsigned long size, 145 unsigned int type, bool increment) 146{ 147 return -ENODEV; 148} 149static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 150{ 151 return -ENODEV; 152} 153static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 154{ 155 return -ENODEV; 156} 157static inline int mtrr_trim_uncached_memory(unsigned long end_pfn) 158{ 159 return 0; 160} 161static 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 175struct 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 181struct 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