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Linux kernel mirror (for testing)
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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) */