| /* $Id: vaddrs.h,v 1.27 2001/07/04 00:18:18 davem Exp $ */ | |
| #ifndef _SPARC_VADDRS_H | |
| #define _SPARC_VADDRS_H | |
| #include <asm/head.h> | |
| /* | |
| * asm-sparc/vaddrs.h: Here we define the virtual addresses at | |
| * which important things will be mapped. | |
| * | |
| * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
| * Copyright (C) 2000 Anton Blanchard (anton@samba.org) | |
| */ | |
| #define SRMMU_MAXMEM 0x0c000000 | |
| #define SRMMU_NOCACHE_VADDR (KERNBASE + SRMMU_MAXMEM) | |
| /* = 0x0fc000000 */ | |
| /* XXX Empiricals - this needs to go away - KMW */ | |
| #define SRMMU_MIN_NOCACHE_PAGES (550) | |
| #define SRMMU_MAX_NOCACHE_PAGES (1280) | |
| /* The following constant is used in mm/srmmu.c::srmmu_nocache_calcsize() | |
| * to determine the amount of memory that will be reserved as nocache: | |
| * | |
| * 256 pages will be taken as nocache per each | |
| * SRMMU_NOCACHE_ALCRATIO MB of system memory. | |
| * | |
| * limits enforced: nocache minimum = 256 pages | |
| * nocache maximum = 1280 pages | |
| */ | |
| #define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */ | |
| #define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */ | |
| #define IOBASE_VADDR 0xfe000000 | |
| #define IOBASE_END 0xfe600000 | |
| #define VMALLOC_START 0xfe600000 | |
| /* XXX Alter this when I get around to fixing sun4c - Anton */ | |
| #define VMALLOC_END 0xffc00000 | |
| /* | |
| * On the sun4/4c we need a place | |
| * to reliably map locked down kernel data. This includes the | |
| * task_struct and kernel stack pages of each process plus the | |
| * scsi buffers during dvma IO transfers, also the floppy buffers | |
| * during pseudo dma which runs with traps off (no faults allowed). | |
| * Some quick calculations yield: | |
| * NR_TASKS <512> * (3 * PAGE_SIZE) == 0x600000 | |
| * Subtract this from 0xc00000 and you get 0x927C0 of vm left | |
| * over to map SCSI dvma + floppy pseudo-dma buffers. So be | |
| * careful if you change NR_TASKS or else there won't be enough | |
| * room for it all. | |
| */ | |
| #define SUN4C_LOCK_VADDR 0xff000000 | |
| #define SUN4C_LOCK_END 0xffc00000 | |
| #define KADB_DEBUGGER_BEGVM 0xffc00000 /* Where kern debugger is in virt-mem */ | |
| #define KADB_DEBUGGER_ENDVM 0xffd00000 | |
| #define DEBUG_FIRSTVADDR KADB_DEBUGGER_BEGVM | |
| #define DEBUG_LASTVADDR KADB_DEBUGGER_ENDVM | |
| #define LINUX_OPPROM_BEGVM 0xffd00000 | |
| #define LINUX_OPPROM_ENDVM 0xfff00000 | |
| #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */ | |
| #define DVMA_END 0xfffc0000 | |
| #endif /* !(_SPARC_VADDRS_H) */ |