home *** CD-ROM | disk | FTP | other *** search
- /* $Id: vaddrs.h,v 1.21 1996/10/07 03:03:02 davem Exp $ */
- #ifndef _SPARC_VADDRS_H
- #define _SPARC_VADDRS_H
-
- #include <asm/head.h>
-
- /* asm-sparc/vaddrs.h: Here will be define the virtual addresses at
- * which important I/O addresses will be mapped.
- * For instance the timer register virtual address
- * is defined here.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- */
-
- /* I can see only one reason why we should have statically defined
- * mappings for devices and is the speedup improvements of not loading
- * a pointer and then the value in the assembly code
- */
- #define IOBASE_VADDR 0xfe000000 /* Base for mapping pages */
- #define IOBASE_LEN 0x00300000 /* Length of the IO area */
- #define IOBASE_END 0xfe300000
- #define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */
- #define DVMA_LEN 0x00040000 /* Size of the DVMA address space */
- #define DVMA_END 0xfff40000
-
- /* IOMMU Mapping area, must be on a 16MB boundary! Note this
- * doesn't count the DVMA areas, the prom lives between the
- * iommu mapping area (for scsi transfer buffers) and the
- * dvma upper range (for lance packet ring buffers).
- */
- #define IOMMU_VADDR 0xff000000
- #define IOMMU_LEN 0x00c00000
- #define IOMMU_END 0xffc00000 /* KADB debugger vm starts here */
-
- /* On the sun4/4c we don't need an IOMMU area, but 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_LEN 0x00c00000
- #define SUN4C_LOCK_END 0xffc00000
-
- /* On sun4m machines we need per-cpu virtual areas */
- #define PERCPU_VADDR 0xffc00000 /* Base for per-cpu virtual mappings */
- #define PERCPU_ENTSIZE 0x00100000
- #define PERCPU_LEN ((PERCPU_ENTSIZE*NCPUS))
-
- /* per-cpu offsets */
- #define PERCPU_TBR_OFFSET 0x00000 /* %tbr, mainly used for identification. */
- #define PERCPU_KSTACK_OFFSET 0x01000 /* Beginning of kernel stack for this cpu */
- #define PERCPU_MBOX_OFFSET 0x03000 /* Prom SMP Mailbox */
- #define PERCPU_CPUID_OFFSET 0x04000 /* Per-cpu ID number. */
- #define PERCPU_ISALIVE_OFFSET 0x04004 /* Has CPU been initted yet? */
- #define PERCPU_ISIDLING_OFFSET 0x04008 /* Is CPU in idle loop spinning? */
-
- #endif /* !(_SPARC_VADDRS_H) */
-
-