Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * OpenRISC Linux
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * OpenRISC implementation:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * et al.
13 */
14
15#ifndef __ASM_OPENRISC_FIXMAP_H
16#define __ASM_OPENRISC_FIXMAP_H
17
18/* Why exactly do we need 2 empty pages between the top of the fixed
19 * addresses and the top of virtual memory? Something is using that
20 * memory space but not sure what right now... If you find it, leave
21 * a comment here.
22 */
23#define FIXADDR_TOP ((unsigned long) (-2*PAGE_SIZE))
24
25#include <linux/kernel.h>
26#include <linux/bug.h>
27#include <asm/page.h>
28
29enum fixed_addresses {
30 FIX_EARLYCON_MEM_BASE,
31 __end_of_fixed_addresses
32};
33
34#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
35/* FIXADDR_BOTTOM might be a better name here... */
36#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
37#define FIXMAP_PAGE_IO PAGE_KERNEL_NOCACHE
38
39extern void __set_fixmap(enum fixed_addresses idx,
40 phys_addr_t phys, pgprot_t flags);
41
42#include <asm-generic/fixmap.h>
43
44#endif