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
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)
20 /* The following constant is used in mm/srmmu.c::srmmu_nocache_calcsize()
21 * to determine the amount of memory that will be reserved as nocache:
23 * 256 pages will be taken as nocache per each
24 * SRMMU_NOCACHE_ALCRATIO MB of system memory.
26 * limits enforced: nocache minimum = 256 pages
27 * nocache maximum = 1280 pages
29 #define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */
31 #define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */
32 #define IOBASE_VADDR 0xfe000000
33 #define IOBASE_END 0xfe300000
35 #define VMALLOC_START 0xfe300000
37 /* XXX Alter this when I get around to fixing sun4c - Anton */
38 #define VMALLOC_END 0xffc00000
41 * On the sun4/4c we need a place
42 * to reliably map locked down kernel data. This includes the
43 * task_struct and kernel stack pages of each process plus the
44 * scsi buffers during dvma IO transfers, also the floppy buffers
45 * during pseudo dma which runs with traps off (no faults allowed).
46 * Some quick calculations yield:
47 * NR_TASKS <512> * (3 * PAGE_SIZE) == 0x600000
48 * Subtract this from 0xc00000 and you get 0x927C0 of vm left
49 * over to map SCSI dvma + floppy pseudo-dma buffers. So be
50 * careful if you change NR_TASKS or else there won't be enough
53 #define SUN4C_LOCK_VADDR 0xff000000
54 #define SUN4C_LOCK_END 0xffc00000
56 #define KADB_DEBUGGER_BEGVM 0xffc00000 /* Where kern debugger is in virt-mem */
57 #define KADB_DEBUGGER_ENDVM 0xffd00000
58 #define DEBUG_FIRSTVADDR KADB_DEBUGGER_BEGVM
59 #define DEBUG_LASTVADDR KADB_DEBUGGER_ENDVM
61 #define LINUX_OPPROM_BEGVM 0xffd00000
62 #define LINUX_OPPROM_ENDVM 0xfff00000
64 #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */
65 #define DVMA_END 0xfffc0000
67 #endif /* !(_SPARC_VADDRS_H) */