1 /* SPDX-License-Identifier: GPL-2.0
2 *
3 * Copyright (C) 1999 by Kaz Kojima
4 *
5 * Defitions for the address spaces of the SH CPUs.
6 */
7 #ifndef __ASM_SH_ADDRSPACE_H
8 #define __ASM_SH_ADDRSPACE_H
9
10 #ifdef __KERNEL__
11
12 #include <cpu/addrspace.h>
13
14 /* If this CPU supports segmentation, hook up the helpers */
15 #ifdef P1SEG
16
17 /*
18 [ P0/U0 (virtual) ] 0x00000000 <------ User space
19 [ P1 (fixed) cached ] 0x80000000 <------ Kernel space
20 [ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
21 [ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
22 [ P4 control ] 0xE0000000
23 */
24
25 /* Returns the privileged segment base of a given address */
26 #define PXSEG(a) (((unsigned long)(a)) & 0xe0000000)
27
28 #ifdef CONFIG_29BIT
29 /*
30 * Map an address to a certain privileged segment
31 */
32 #define P1SEGADDR(a) \
33 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P1SEG))
34 #define P2SEGADDR(a) \
35 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P2SEG))
36 #define P3SEGADDR(a) \
37 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P3SEG))
38 #define P4SEGADDR(a) \
39 ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P4SEG))
40 #else
41 /*
42 * These will never work in 32-bit, don't even bother.
43 */
44 #define P1SEGADDR(a) ({ (void)(a); BUG(); NULL; })
45 #define P2SEGADDR(a) ({ (void)(a); BUG(); NULL; })
46 #define P3SEGADDR(a) ({ (void)(a); BUG(); NULL; })
47 #define P4SEGADDR(a) ({ (void)(a); BUG(); NULL; })
48 #endif
49 #endif /* P1SEG */
50
51 /* Check if an address can be reached in 29 bits */
52 #define IS_29BIT(a) (((unsigned long)(a)) < 0x20000000)
53
54 #ifdef CONFIG_SH_STORE_QUEUES
55 /*
56 * This is a special case for the SH-4 store queues, as pages for this
57 * space still need to be faulted in before it's possible to flush the
58 * store queue cache for writeout to the remapped region.
59 */
60 #define P3_ADDR_MAX (P4SEG_STORE_QUE + 0x04000000)
61 #else
62 #define P3_ADDR_MAX P4SEG
63 #endif
64
65 #endif /* __KERNEL__ */
66 #endif /* __ASM_SH_ADDRSPACE_H */