1 /* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */ 2 /* Generic MTRR (Memory Type Range Register) ioctls. 3 4 Copyright (C) 1997-1999 Richard Gooch 5 6 This library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Library General Public 8 License as published by the Free Software Foundation; either 9 version 2 of the License, or (at your option) any later version. 10 11 This library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Library General Public License for more details. 15 16 You should have received a copy of the GNU Library General Public 17 License along with this library; if not, write to the Free 18 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 20 Richard Gooch may be reached by email at rgooch (at) atnf.csiro.au 21 The postal address is: 22 Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia. 23 */ 24 #ifndef _UAPI_ASM_X86_MTRR_H 25 #define _UAPI_ASM_X86_MTRR_H 26 27 #include <linux/types.h> 28 #include <linux/ioctl.h> 29 #include <linux/errno.h> 30 31 #define MTRR_IOCTL_BASE 'M' 32 33 /* Warning: this structure has a different order from i386 34 on x86-64. The 32bit emulation code takes care of that. 35 But you need to use this for 64bit, otherwise your X server 36 will break. */ 37 38 #ifdef __i386__ 39 struct mtrr_sentry { 40 unsigned long base; /* Base address */ 41 unsigned int size; /* Size of region */ 42 unsigned int type; /* Type of region */ 43 }; 44 45 struct mtrr_gentry { 46 unsigned int regnum; /* Register number */ 47 unsigned long base; /* Base address */ 48 unsigned int size; /* Size of region */ 49 unsigned int type; /* Type of region */ 50 }; 51 52 #else /* __i386__ */ 53 54 struct mtrr_sentry { 55 __u64 base; /* Base address */ 56 __u32 size; /* Size of region */ 57 __u32 type; /* Type of region */ 58 }; 59 60 struct mtrr_gentry { 61 __u64 base; /* Base address */ 62 __u32 size; /* Size of region */ 63 __u32 regnum; /* Register number */ 64 __u32 type; /* Type of region */ 65 __u32 _pad; /* Unused */ 66 }; 67 68 #endif /* !__i386__ */ 69 70 struct mtrr_var_range { 71 __u32 base_lo; 72 __u32 base_hi; 73 __u32 mask_lo; 74 __u32 mask_hi; 75 }; 76 77 /* In the Intel processor's MTRR interface, the MTRR type is always held in 78 an 8 bit field: */ 79 typedef __u8 mtrr_type; 80 81 #define MTRR_NUM_FIXED_RANGES 88 82 #define MTRR_MAX_VAR_RANGES 256 83 84 struct mtrr_state_type { 85 struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES]; 86 mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES]; 87 unsigned char enabled; 88 unsigned char have_fixed; 89 mtrr_type def_type; 90 }; 91 92 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) 93 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) 94 95 /* These are the various ioctls */ 96 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry) 97 #define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry) 98 #define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry) 99 #define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry) 100 #define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry) 101 #define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry) 102 #define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry) 103 #define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry) 104 #define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry) 105 #define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry) 106 107 /* MTRR memory types, which are defined in SDM */ 108 #define MTRR_TYPE_UNCACHABLE 0 109 #define MTRR_TYPE_WRCOMB 1 110 /*#define MTRR_TYPE_ 2*/ 111 /*#define MTRR_TYPE_ 3*/ 112 #define MTRR_TYPE_WRTHROUGH 4 113 #define MTRR_TYPE_WRPROT 5 114 #define MTRR_TYPE_WRBACK 6 115 #define MTRR_NUM_TYPES 7 116 117 /* 118 * Invalid MTRR memory type. mtrr_type_lookup() returns this value when 119 * MTRRs are disabled. Note, this value is allocated from the reserved 120 * values (0x7-0xff) of the MTRR memory types. 121 */ 122 #define MTRR_TYPE_INVALID 0xff 123 124 #endif /* _UAPI_ASM_X86_MTRR_H */ 125
