1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SPARC_VADDRS_H
3 #define _SPARC_VADDRS_H
4
5 #include <asm/head.h>
6
7 /*
8 * asm/vaddrs.h: Here we define the virtual addresses at
9 * which important things will be mapped.
10 *
11 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
12 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
13 */
14
15 #define SRMMU_MAXMEM 0x0c000000
16
17 #define SRMMU_NOCACHE_VADDR (KERNBASE + SRMMU_MAXMEM)
18 /* = 0x0fc000000 */
19 /* XXX Empiricals - this needs to go away - KMW */
20 #define SRMMU_MIN_NOCACHE_PAGES (550)
21 #define SRMMU_MAX_NOCACHE_PAGES (1280)
22
23 /* The following constant is used in mm/srmmu.c::srmmu_nocache_calcsize()
24 * to determine the amount of memory that will be reserved as nocache:
25 *
26 * 256 pages will be taken as nocache per each
27 * SRMMU_NOCACHE_ALCRATIO MB of system memory.
28 *
29 * limits enforced: nocache minimum = 256 pages
30 * nocache maximum = 1280 pages
31 */
32 #define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */
33
34 #ifndef __ASSEMBLY__
35 #include <asm/kmap_size.h>
36
37 enum fixed_addresses {
38 FIX_HOLE,
39 #ifdef CONFIG_HIGHMEM
40 FIX_KMAP_BEGIN,
41 FIX_KMAP_END = (KM_MAX_IDX * NR_CPUS),
42 #endif
43 __end_of_fixed_addresses
44 };
45 #endif
46
47 /* Leave one empty page between IO pages at 0xfd000000 and
48 * the top of the fixmap.
49 */
50 #define FIXADDR_TOP (0xfcfff000UL)
51 #define FIXADDR_SIZE ((FIX_KMAP_END + 1) << PAGE_SHIFT)
52 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
53
54 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
55
56 #define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */
57 #define IOBASE_VADDR 0xfe000000
58 #define IOBASE_END 0xfe600000
59
60 #define KADB_DEBUGGER_BEGVM 0xffc00000 /* Where kern debugger is in virt-mem */
61 #define KADB_DEBUGGER_ENDVM 0xffd00000
62 #define DEBUG_FIRSTVADDR KADB_DEBUGGER_BEGVM
63 #define DEBUG_LASTVADDR KADB_DEBUGGER_ENDVM
64
65 #define LINUX_OPPROM_BEGVM 0xffd00000
66 #define LINUX_OPPROM_ENDVM 0xfff00000
67
68 #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */
69 #define DVMA_END 0xfffc0000
70
71 #endif /* !(_SPARC_VADDRS_H) */
72
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