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@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