arch/sparc/include/asm/vaddrs.h

   1 #ifndef _SPARC_VADDRS_H
   2 #define _SPARC_VADDRS_H
   3
   4 #include <asm/head.h>
   5
   6 /*
   7  * asm/vaddrs.h:  Here we define the virtual addresses at
   8  *                      which important things will be mapped.
   9  *
  10  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
  11  * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
  12  */
  13
  14 #define SRMMU_MAXMEM            0x0c000000
  15
  16 #define SRMMU_NOCACHE_VADDR     (KERNBASE + SRMMU_MAXMEM)
  17                                 /* = 0x0fc000000 */
  18 /* XXX Empiricals - this needs to go away - KMW */
  19 #define SRMMU_MIN_NOCACHE_PAGES (550)
  20 #define SRMMU_MAX_NOCACHE_PAGES (1280)
  21
  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:
  24  *
  25  * 256 pages will be taken as nocache per each
  26  * SRMMU_NOCACHE_ALCRATIO MB of system memory.
  27  *
  28  * limits enforced:     nocache minimum = 256 pages
  29  *                      nocache maximum = 1280 pages
  30  */
  31 #define SRMMU_NOCACHE_ALCRATIO  64      /* 256 pages per 64MB of system RAM */
  32
  33 #define SUN4M_IOBASE_VADDR      0xfd000000 /* Base for mapping pages */
  34 #define IOBASE_VADDR            0xfe000000
  35 #define IOBASE_END              0xfe600000
  36
  37 /*
  38  * On the sun4/4c we need a place
  39  * to reliably map locked down kernel data.  This includes the
  40  * task_struct and kernel stack pages of each process plus the
  41  * scsi buffers during dvma IO transfers, also the floppy buffers
  42  * during pseudo dma which runs with traps off (no faults allowed).
  43  * Some quick calculations yield:
  44  *       NR_TASKS <512> * (3 * PAGE_SIZE) == 0x600000
  45  * Subtract this from 0xc00000 and you get 0x927C0 of vm left
  46  * over to map SCSI dvma + floppy pseudo-dma buffers.  So be
  47  * careful if you change NR_TASKS or else there won't be enough
  48  * room for it all.
  49  */
  50 #define SUN4C_LOCK_VADDR        0xff000000
  51 #define SUN4C_LOCK_END          0xffc00000
  52
  53 #define KADB_DEBUGGER_BEGVM     0xffc00000 /* Where kern debugger is in virt-mem */
  54 #define KADB_DEBUGGER_ENDVM     0xffd00000
  55 #define DEBUG_FIRSTVADDR        KADB_DEBUGGER_BEGVM
  56 #define DEBUG_LASTVADDR         KADB_DEBUGGER_ENDVM
  57
  58 #define LINUX_OPPROM_BEGVM      0xffd00000
  59 #define LINUX_OPPROM_ENDVM      0xfff00000
  60
  61 #define DVMA_VADDR              0xfff00000 /* Base area of the DVMA on suns */
  62 #define DVMA_END                0xfffc0000
  63
  64 #endif /* !(_SPARC_VADDRS_H) */