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