arch/sparc/include/asm/vaddrs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _SPARC_VADDRS_H
   3 #define _SPARC_VADDRS_H
   4
   5 #include <asm/head.h>
   6
   7 /*
   8  * asm/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 #ifndef __ASSEMBLY__
  35 #include <asm/kmap_size.h>
  36
  37 enum fixed_addresses {
  38         FIX_HOLE,
  39 #ifdef CONFIG_HIGHMEM
  40         FIX_KMAP_BEGIN,
  41         FIX_KMAP_END = (KM_MAX_IDX * NR_CPUS),
  42 #endif
  43         __end_of_fixed_addresses
  44 };
  45 #endif
  46
  47 /* Leave one empty page between IO pages at 0xfd000000 and
  48  * the top of the fixmap.
  49  */
  50 #define FIXADDR_TOP             (0xfcfff000UL)
  51 #define FIXADDR_SIZE            ((FIX_KMAP_END + 1) << PAGE_SHIFT)
  52 #define FIXADDR_START           (FIXADDR_TOP - FIXADDR_SIZE)
  53
  54 #define __fix_to_virt(x)        (FIXADDR_TOP - ((x) << PAGE_SHIFT))
  55
  56 #define SUN4M_IOBASE_VADDR      0xfd000000 /* Base for mapping pages */
  57 #define IOBASE_VADDR            0xfe000000
  58 #define IOBASE_END              0xfe600000
  59
  60 #define KADB_DEBUGGER_BEGVM     0xffc00000 /* Where kern debugger is in virt-mem */
  61 #define KADB_DEBUGGER_ENDVM     0xffd00000
  62 #define DEBUG_FIRSTVADDR        KADB_DEBUGGER_BEGVM
  63 #define DEBUG_LASTVADDR         KADB_DEBUGGER_ENDVM
  64
  65 #define LINUX_OPPROM_BEGVM      0xffd00000
  66 #define LINUX_OPPROM_ENDVM      0xfff00000
  67
  68 #define DVMA_VADDR              0xfff00000 /* Base area of the DVMA on suns */
  69 #define DVMA_END                0xfffc0000
  70
  71 #endif /* !(_SPARC_VADDRS_H) */