Linux v2.6.16-rc1
[linux-2.6/next.git] / include / asm-sparc / vaddrs.h
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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
5 #include <asm/head.h>
7 /*
8 * asm-sparc/vaddrs.h: Here we define the virtual addresses at
9 * which important things will be mapped.
11 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
12 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
15 #define SRMMU_MAXMEM 0x0c000000
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)
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:
26 * 256 pages will be taken as nocache per each
27 * SRMMU_NOCACHE_ALCRATIO MB of system memory.
29 * limits enforced: nocache minimum = 256 pages
30 * nocache maximum = 1280 pages
32 #define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */
34 #define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */
35 #define IOBASE_VADDR 0xfe000000
36 #define IOBASE_END 0xfe600000
38 #define VMALLOC_START 0xfe600000
40 /* XXX Alter this when I get around to fixing sun4c - Anton */
41 #define VMALLOC_END 0xffc00000
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.
56 #define SUN4C_LOCK_VADDR 0xff000000
57 #define SUN4C_LOCK_END 0xffc00000
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
64 #define LINUX_OPPROM_BEGVM 0xffd00000
65 #define LINUX_OPPROM_ENDVM 0xfff00000
67 #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */
68 #define DVMA_END 0xfffc0000
70 #endif /* !(_SPARC_VADDRS_H) */