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 47struct 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 60void mtrr_bp_init(void); 61void mtrr_overwrite_state(struct mtrr_var_range *var, unsigned int num_var, 62 mtrr_type def_type); 63extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform); 64extern void mtrr_save_fixed_ranges(void *); 65extern void mtrr_save_state(void); 66extern int mtrr_add(unsigned long base, unsigned long size, 67 unsigned int type, bool increment); 68extern int mtrr_add_page(unsigned long base, unsigned long size, 69 unsigned int type, bool increment); 70extern int mtrr_del(int reg, unsigned long base, unsigned long size); 71extern int mtrr_del_page(int reg, unsigned long base, unsigned long size); 72extern void mtrr_bp_restore(void); 73extern int mtrr_trim_uncached_memory(unsigned long end_pfn); 74extern int amd_special_default_mtrr(void); 75void mtrr_disable(void); 76void mtrr_enable(void); 77void mtrr_generic_set_state(void); 78# else 79static inline void mtrr_overwrite_state(struct mtrr_var_range *var, 80 unsigned int num_var, 81 mtrr_type def_type) 82{ 83} 84 85static 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) 97static inline int mtrr_add(unsigned long base, unsigned long size, 98 unsigned int type, bool increment) 99{ 100 return -ENODEV; 101} 102static inline int mtrr_add_page(unsigned long base, unsigned long size, 103 unsigned int type, bool increment) 104{ 105 return -ENODEV; 106} 107static inline int mtrr_del(int reg, unsigned long base, unsigned long size) 108{ 109 return -ENODEV; 110} 111static inline int mtrr_del_page(int reg, unsigned long base, unsigned long size) 112{ 113 return -ENODEV; 114} 115static 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 129struct 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 135struct 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