1 #ifndef _SPARC_VADDRS_H
2 #define _SPARC_VADDRS_H
7 * asm-sparc/vaddrs.h: Here we define the virtual addresses at
8 * which important things will be mapped.
10 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
11 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
14 #define SRMMU_MAXMEM 0x0c000000
16 #define SRMMU_NOCACHE_VADDR (KERNBASE + SRMMU_MAXMEM)
18 /* XXX Empiricals - this needs to go away - KMW */
19 #define SRMMU_MIN_NOCACHE_PAGES (550)
20 #define SRMMU_MAX_NOCACHE_PAGES (1280)
22 /* The following constant is used in mm/srmmu.c::srmmu_nocache_calcsize()
23 * to determine the amount of memory that will be reserved as nocache:
25 * 256 pages will be taken as nocache per each
26 * SRMMU_NOCACHE_ALCRATIO MB of system memory.
28 * limits enforced: nocache minimum = 256 pages
29 * nocache maximum = 1280 pages
31 #define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */
33 #define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */
34 #define IOBASE_VADDR 0xfe000000
35 #define IOBASE_END 0xfe600000
37 #define VMALLOC_START 0xfe600000
39 /* XXX Alter this when I get around to fixing sun4c - Anton */
40 #define VMALLOC_END 0xffc00000
43 * On the sun4/4c we need a place
44 * to reliably map locked down kernel data. This includes the
45 * task_struct and kernel stack pages of each process plus the
46 * scsi buffers during dvma IO transfers, also the floppy buffers
47 * during pseudo dma which runs with traps off (no faults allowed).
48 * Some quick calculations yield:
49 * NR_TASKS <512> * (3 * PAGE_SIZE) == 0x600000
50 * Subtract this from 0xc00000 and you get 0x927C0 of vm left
51 * over to map SCSI dvma + floppy pseudo-dma buffers. So be
52 * careful if you change NR_TASKS or else there won't be enough
55 #define SUN4C_LOCK_VADDR 0xff000000
56 #define SUN4C_LOCK_END 0xffc00000
58 #define KADB_DEBUGGER_BEGVM 0xffc00000 /* Where kern debugger is in virt-mem */
59 #define KADB_DEBUGGER_ENDVM 0xffd00000
60 #define DEBUG_FIRSTVADDR KADB_DEBUGGER_BEGVM
61 #define DEBUG_LASTVADDR KADB_DEBUGGER_ENDVM
63 #define LINUX_OPPROM_BEGVM 0xffd00000
64 #define LINUX_OPPROM_ENDVM 0xfff00000
66 #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */
67 #define DVMA_END 0xfffc0000
69 #endif /* !(_SPARC_VADDRS_H) */