xref: /freebsd/sys/powerpc/include/sr.h (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*-
2  * Copyright (C) 2002 Benno Rice.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  *
25  * $FreeBSD$
26  */
27 
28 #ifndef _MACHINE_SR_H_
29 #define	_MACHINE_SR_H_
30 
31 /*
32  * Bit definitions for segment registers.
33  *
34  * PowerPC Microprocessor Family: The Programming Environments for 32-bit
35  * Microprocessors, section 2.3.5
36  */
37 
38 #define	SR_TYPE		0x80000000	/* Type selector */
39 #define	SR_KS		0x40000000	/* Supervisor-state protection key */
40 #define	SR_KP		0x20000000	/* User-state protection key */
41 #define	SR_N		0x10000000	/* No-execute protection */
42 #define	SR_VSID_MASK	0x00ffffff	/* Virtual Segment ID mask */
43 
44 /* Kernel segment register usage */
45 #define	USER_SR		12
46 #define	KERNEL_SR	13
47 #define	KERNEL2_SR	14
48 #define	KERNEL_VSIDBITS	0xfffff
49 #define	KERNEL_SEGMENT	(0xfffff0 + KERNEL_SR)
50 #define	KERNEL2_SEGMENT	(0xfffff0 + KERNEL2_SR)
51 #define	EMPTY_SEGMENT	0xfffff0
52 #define	USER_ADDR	((void *)(USER_SR << ADDR_SR_SHFT))
53 #define	SEGMENT_LENGTH	0x10000000
54 #define	SEGMENT_MASK	0xf0000000
55 
56 #endif /* !_MACHINE_SR_H_ */
57