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1da177e4 LT |
1 | /* $Id: vaddrs.h,v 1.27 2001/07/04 00:18:18 davem Exp $ */ |
2 | #ifndef _SPARC_VADDRS_H | |
3 | #define _SPARC_VADDRS_H | |
4 | ||
5 | #include <asm/head.h> | |
6 | ||
7 | /* | |
8 | * asm-sparc/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 | #define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */ | |
35 | #define IOBASE_VADDR 0xfe000000 | |
36 | #define IOBASE_END 0xfe600000 | |
37 | ||
38 | #define VMALLOC_START 0xfe600000 | |
39 | ||
40 | /* XXX Alter this when I get around to fixing sun4c - Anton */ | |
41 | #define VMALLOC_END 0xffc00000 | |
42 | ||
43 | /* | |
44 | * On the sun4/4c we need a place | |
45 | * to reliably map locked down kernel data. This includes the | |
46 | * task_struct and kernel stack pages of each process plus the | |
47 | * scsi buffers during dvma IO transfers, also the floppy buffers | |
48 | * during pseudo dma which runs with traps off (no faults allowed). | |
49 | * Some quick calculations yield: | |
50 | * NR_TASKS <512> * (3 * PAGE_SIZE) == 0x600000 | |
51 | * Subtract this from 0xc00000 and you get 0x927C0 of vm left | |
52 | * over to map SCSI dvma + floppy pseudo-dma buffers. So be | |
53 | * careful if you change NR_TASKS or else there won't be enough | |
54 | * room for it all. | |
55 | */ | |
56 | #define SUN4C_LOCK_VADDR 0xff000000 | |
57 | #define SUN4C_LOCK_END 0xffc00000 | |
58 | ||
59 | #define KADB_DEBUGGER_BEGVM 0xffc00000 /* Where kern debugger is in virt-mem */ | |
60 | #define KADB_DEBUGGER_ENDVM 0xffd00000 | |
61 | #define DEBUG_FIRSTVADDR KADB_DEBUGGER_BEGVM | |
62 | #define DEBUG_LASTVADDR KADB_DEBUGGER_ENDVM | |
63 | ||
64 | #define LINUX_OPPROM_BEGVM 0xffd00000 | |
65 | #define LINUX_OPPROM_ENDVM 0xfff00000 | |
66 | ||
67 | #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */ | |
68 | #define DVMA_END 0xfffc0000 | |
69 | ||
70 | #endif /* !(_SPARC_VADDRS_H) */ |