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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*/
#ifndef __ASM_OPENRISC_FIXMAP_H
#define __ASM_OPENRISC_FIXMAP_H
/* Why exactly do we need 2 empty pages between the top of the fixed
* addresses and the top of virtual memory? Something is using that
* memory space but not sure what right now... If you find it, leave
* a comment here.
*/
#define FIXADDR_TOP ((unsigned long) (-2*PAGE_SIZE))
#include <linux/kernel.h>
#include <linux/bug.h>
#include <asm/page.h>
/*
* On OpenRISC we use these special fixed_addresses for doing ioremap
* early in the boot process before memory initialization is complete.
* This is used, in particular, by the early serial console code.
*
* It's not really 'fixmap', per se, but fits loosely into the same
* paradigm.
*/
enum fixed_addresses {
/*
* FIX_IOREMAP entries are useful for mapping physical address
* space before ioremap() is useable, e.g. really early in boot
* before kmalloc() is working.
*/
#define FIX_N_IOREMAPS 32
FIX_IOREMAP_BEGIN,
FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1,
__end_of_fixed_addresses
};
#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
/* FIXADDR_BOTTOM might be a better name here... */
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
#include <asm-generic/fixmap.h>
#endif
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