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 _LINUX_MTRR_H 24#define _LINUX_MTRR_H 25 26#include <linux/config.h> 27#include <linux/ioctl.h> 28 29#define MTRR_IOCTL_BASE 'M' 30 31struct mtrr_sentry 32{ 33 unsigned long base; /* Base address */ 34 unsigned long size; /* Size of region */ 35 unsigned int type; /* Type of region */ 36}; 37 38struct mtrr_gentry 39{ 40 unsigned int regnum; /* Register number */ 41 unsigned long base; /* Base address */ 42 unsigned long size; /* Size of region */ 43 unsigned int type; /* Type of region */ 44}; 45 46/* These are the various ioctls */ 47#define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry) 48#define MTRRIOC_SET_ENTRY _IOW(MTRR_IOCTL_BASE, 1, struct mtrr_sentry) 49#define MTRRIOC_DEL_ENTRY _IOW(MTRR_IOCTL_BASE, 2, struct mtrr_sentry) 50#define MTRRIOC_GET_ENTRY _IOWR(MTRR_IOCTL_BASE, 3, struct mtrr_gentry) 51#define MTRRIOC_KILL_ENTRY _IOW(MTRR_IOCTL_BASE, 4, struct mtrr_sentry) 52#define MTRRIOC_ADD_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 5, struct mtrr_sentry) 53#define MTRRIOC_SET_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 6, struct mtrr_sentry) 54#define MTRRIOC_DEL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 7, struct mtrr_sentry) 55#define MTRRIOC_GET_PAGE_ENTRY _IOWR(MTRR_IOCTL_BASE, 8, struct mtrr_gentry) 56#define MTRRIOC_KILL_PAGE_ENTRY _IOW(MTRR_IOCTL_BASE, 9, struct mtrr_sentry) 57 58/* These are the region types */ 59#define MTRR_TYPE_UNCACHABLE 0 60#define MTRR_TYPE_WRCOMB 1 61/*#define MTRR_TYPE_ 2*/ 62/*#define MTRR_TYPE_ 3*/ 63#define MTRR_TYPE_WRTHROUGH 4 64#define MTRR_TYPE_WRPROT 5 65#define MTRR_TYPE_WRBACK 6 66#define MTRR_NUM_TYPES 7 67 68#ifdef MTRR_NEED_STRINGS 69static char *mtrr_strings[MTRR_NUM_TYPES] = 70{ 71 "uncachable", /* 0 */ 72 "write-combining", /* 1 */ 73 "?", /* 2 */ 74 "?", /* 3 */ 75 "write-through", /* 4 */ 76 "write-protect", /* 5 */ 77 "write-back", /* 6 */ 78}; 79#endif 80 81#ifdef __KERNEL__ 82 83/* The following functions are for use by other drivers */ 84# ifdef CONFIG_MTRR 85extern int mtrr_add (unsigned long base, unsigned long size, 86 unsigned int type, char increment); 87extern int mtrr_add_page (unsigned long base, unsigned long size, 88 unsigned int type, char increment); 89extern int mtrr_del (int reg, unsigned long base, unsigned long size); 90extern int mtrr_del_page (int reg, unsigned long base, unsigned long size); 91extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 92# else 93static __inline__ int mtrr_add (unsigned long base, unsigned long size, 94 unsigned int type, char increment) 95{ 96 return -ENODEV; 97} 98static __inline__ int mtrr_add_page (unsigned long base, unsigned long size, 99 unsigned int type, char increment) 100{ 101 return -ENODEV; 102} 103static __inline__ int mtrr_del (int reg, unsigned long base, 104 unsigned long size) 105{ 106 return -ENODEV; 107} 108static __inline__ int mtrr_del_page (int reg, unsigned long base, 109 unsigned long size) 110{ 111 return -ENODEV; 112} 113 114static __inline__ void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) {;} 115 116# endif 117 118/* The following functions are for initialisation: don't use them! */ 119extern int mtrr_init (void); 120# if defined(CONFIG_SMP) && defined(CONFIG_MTRR) 121extern void mtrr_init_boot_cpu (void); 122extern void mtrr_init_secondary_cpu (void); 123# endif 124 125#endif 126 127#endif /* _LINUX_MTRR_H */ 128