xref: /openbmc/linux/arch/sparc/include/asm/vaddrs.h (revision 3293efa9)
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