fixmap.h

 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	FIX_TEXT_POKE0,
32	__end_of_fixed_addresses
33};
34
35#define FIXADDR_SIZE		(__end_of_fixed_addresses << PAGE_SHIFT)
36/* FIXADDR_BOTTOM might be a better name here... */
37#define FIXADDR_START		(FIXADDR_TOP - FIXADDR_SIZE)
38#define FIXMAP_PAGE_IO		PAGE_KERNEL_NOCACHE
39
40extern void __set_fixmap(enum fixed_addresses idx,
41			 phys_addr_t phys, pgprot_t flags);
42
43#include <asm-generic/fixmap.h>
44
45#endif