include/asm-sparc/vaddrs.h

   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) */