tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/include/asm-arm/arch-ebsa285/memory.h
3 *
4 * Copyright (C) 1996-1999 Russell King.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Changelog:
11 * 20-Oct-1996 RMK Created
12 * 31-Dec-1997 RMK Fixed definitions to reduce warnings.
13 * 17-May-1998 DAG Added __virt_to_bus and __bus_to_virt functions.
14 * 21-Nov-1998 RMK Changed __virt_to_bus and __bus_to_virt to macros.
15 * 21-Mar-1999 RMK Added PAGE_OFFSET for co285 architecture.
16 * Renamed to memory.h
17 * Moved PAGE_OFFSET and TASK_SIZE here
18 */
19#ifndef __ASM_ARCH_MEMORY_H
20#define __ASM_ARCH_MEMORY_H
21
22#include <linux/config.h>
23
24#if defined(CONFIG_FOOTBRIDGE_ADDIN)
25/*
26 * If we may be using add-in footbridge mode, then we must
27 * use the out-of-line translation that makes use of the
28 * PCI BAR
29 */
30#ifndef __ASSEMBLY__
31extern unsigned long __virt_to_bus(unsigned long);
32extern unsigned long __bus_to_virt(unsigned long);
33#endif
34
35#elif defined(CONFIG_FOOTBRIDGE_HOST)
36
37#define __virt_to_bus(x) ((x) - 0xe0000000)
38#define __bus_to_virt(x) ((x) + 0xe0000000)
39
40#else
41
42#error "Undefined footbridge mode"
43
44#endif
45
46#if defined(CONFIG_ARCH_FOOTBRIDGE)
47
48/* Task size and page offset at 3GB */
49#define TASK_SIZE (0xbf000000UL)
50#define PAGE_OFFSET (0xc0000000UL)
51
52#elif defined(CONFIG_ARCH_CO285)
53
54/* Task size and page offset at 1.5GB */
55#define TASK_SIZE (0x5f000000UL)
56#define PAGE_OFFSET (0x60000000UL)
57
58#else
59
60#error "Undefined footbridge architecture"
61
62#endif
63
64/*
65 * Physical DRAM offset.
66 */
67#define PHYS_OFFSET (0x00000000UL)
68
69/*
70 * This decides where the kernel will search for a free chunk of vm
71 * space during mmap's.
72 */
73#define TASK_UNMAPPED_BASE ((TASK_SIZE + 0x01000000) / 3)
74
75#endif