tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef _SPARC_VADDRS_H
2#define _SPARC_VADDRS_H
3
4#include <asm/head.h>
5
6/*
7 * asm/vaddrs.h: Here we define the virtual addresses at
8 * which important things will be mapped.
9 *
10 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
11 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
12 */
13
14#define SRMMU_MAXMEM 0x0c000000
15
16#define SRMMU_NOCACHE_VADDR (KERNBASE + SRMMU_MAXMEM)
17 /* = 0x0fc000000 */
18/* XXX Empiricals - this needs to go away - KMW */
19#define SRMMU_MIN_NOCACHE_PAGES (550)
20#define SRMMU_MAX_NOCACHE_PAGES (1280)
21
22/* The following constant is used in mm/srmmu.c::srmmu_nocache_calcsize()
23 * to determine the amount of memory that will be reserved as nocache:
24 *
25 * 256 pages will be taken as nocache per each
26 * SRMMU_NOCACHE_ALCRATIO MB of system memory.
27 *
28 * limits enforced: nocache minimum = 256 pages
29 * nocache maximum = 1280 pages
30 */
31#define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */
32
33#define SUN4M_IOBASE_VADDR 0xfd000000 /* Base for mapping pages */
34#define IOBASE_VADDR 0xfe000000
35#define IOBASE_END 0xfe600000
36
37/*
38 * On the sun4/4c we need a place
39 * to reliably map locked down kernel data. This includes the
40 * task_struct and kernel stack pages of each process plus the
41 * scsi buffers during dvma IO transfers, also the floppy buffers
42 * during pseudo dma which runs with traps off (no faults allowed).
43 * Some quick calculations yield:
44 * NR_TASKS <512> * (3 * PAGE_SIZE) == 0x600000
45 * Subtract this from 0xc00000 and you get 0x927C0 of vm left
46 * over to map SCSI dvma + floppy pseudo-dma buffers. So be
47 * careful if you change NR_TASKS or else there won't be enough
48 * room for it all.
49 */
50#define SUN4C_LOCK_VADDR 0xff000000
51#define SUN4C_LOCK_END 0xffc00000
52
53#define KADB_DEBUGGER_BEGVM 0xffc00000 /* Where kern debugger is in virt-mem */
54#define KADB_DEBUGGER_ENDVM 0xffd00000
55#define DEBUG_FIRSTVADDR KADB_DEBUGGER_BEGVM
56#define DEBUG_LASTVADDR KADB_DEBUGGER_ENDVM
57
58#define LINUX_OPPROM_BEGVM 0xffd00000
59#define LINUX_OPPROM_ENDVM 0xfff00000
60
61#define DVMA_VADDR 0xfff00000 /* Base area of the DVMA on suns */
62#define DVMA_END 0xfffc0000
63
64#endif /* !(_SPARC_VADDRS_H) */