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 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: 22 * 23 * 256 pages will be taken as nocache per each 24 * SRMMU_NOCACHE_ALCRATIO MB of system memory. 25 * 26 * limits enforced: nocache minimum = 256 pages 27 * nocache maximum = 1280 pages 28 */ 29 #define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */ 30 31 #define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */ 32 #define IOBASE_VADDR 0xfe000000 33 #define IOBASE_END 0xfe300000 34 35 #define VMALLOC_START 0xfe300000 36 37 /* XXX Alter this when I get around to fixing sun4c - Anton */ 38 #define VMALLOC_END 0xffc00000 39 40 /* 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 51 * room for it all. 52 */ 53 #define SUN4C_LOCK_VADDR 0xff000000 54 #define SUN4C_LOCK_END 0xffc00000 55 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 60 61 #define LINUX_OPPROM_BEGVM 0xffd00000 62 #define LINUX_OPPROM_ENDVM 0xfff00000 63 64 #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */ 65 #define DVMA_END 0xfffc0000 66 67 #endif /* !(_SPARC_VADDRS_H) */ 68