Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1999 by Kaz Kojima
7 *
8 * Defitions for the address spaces of the SH CPUs.
9 */
10#ifndef __ASM_SH_ADDRSPACE_H
11#define __ASM_SH_ADDRSPACE_H
12
13#ifdef __KERNEL__
14
15#include <asm/cpu/addrspace.h>
16
17/* If this CPU supports segmentation, hook up the helpers */
18#ifdef P1SEG
19
20/*
21 [ P0/U0 (virtual) ] 0x00000000 <------ User space
22 [ P1 (fixed) cached ] 0x80000000 <------ Kernel space
23 [ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
24 [ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
25 [ P4 control ] 0xE0000000
26 */
27
28/* Returns the privileged segment base of a given address */
29#define PXSEG(a) (((unsigned long)(a)) & 0xe0000000)
30
31/* Returns the physical address of a PnSEG (n=1,2) address */
32#define PHYSADDR(a) (((unsigned long)(a)) & 0x1fffffff)
33
34#ifdef CONFIG_29BIT
35/*
36 * Map an address to a certain privileged segment
37 */
38#define P1SEGADDR(a) \
39 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P1SEG))
40#define P2SEGADDR(a) \
41 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P2SEG))
42#define P3SEGADDR(a) \
43 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P3SEG))
44#define P4SEGADDR(a) \
45 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P4SEG))
46#endif /* 29BIT */
47#endif /* P1SEG */
48
49/* Check if an address can be reached in 29 bits */
50#define IS_29BIT(a) (((unsigned long)(a)) < 0x20000000)
51
52#endif /* __KERNEL__ */
53#endif /* __ASM_SH_ADDRSPACE_H */