1118616Snjl/* SPDX-License-Identifier: GPL-2.0-or-later */ 2118616Snjl/* 3118616Snjl * OpenRISC Linux 4118616Snjl * 5118616Snjl * Linux architectural port borrowing liberally from similar works of 6118616Snjl * others. All original copyrights apply as per the original source 7118616Snjl * declaration. 8118616Snjl * 9118616Snjl * OpenRISC implementation: 10118616Snjl * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 11118616Snjl * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 12118616Snjl * et al. 13118616Snjl */ 14118616Snjl 15118616Snjl#ifndef __ASM_OPENRISC_FIXMAP_H 16118616Snjl#define __ASM_OPENRISC_FIXMAP_H 17118616Snjl 18118616Snjl/* Why exactly do we need 2 empty pages between the top of the fixed 19118616Snjl * addresses and the top of virtual memory? Something is using that 20118616Snjl * memory space but not sure what right now... If you find it, leave 21118616Snjl * a comment here. 22118616Snjl */ 23118616Snjl#define FIXADDR_TOP ((unsigned long) (-2*PAGE_SIZE)) 24118616Snjl 25118616Snjl#include <linux/kernel.h> 26118616Snjl#include <linux/bug.h> 27118616Snjl#include <asm/page.h> 28118616Snjl 29118616Snjl/* 30118616Snjl * On OpenRISC we use these special fixed_addresses for doing ioremap 31118616Snjl * early in the boot process before memory initialization is complete. 32118616Snjl * This is used, in particular, by the early serial console code. 33118616Snjl * 34118616Snjl * It's not really 'fixmap', per se, but fits loosely into the same 35118616Snjl * paradigm. 36118616Snjl */ 37118616Snjlenum fixed_addresses { 38118616Snjl /* 39118616Snjl * FIX_IOREMAP entries are useful for mapping physical address 40118616Snjl * space before ioremap() is useable, e.g. really early in boot 41118616Snjl * before kmalloc() is working. 42118616Snjl */ 43118616Snjl#define FIX_N_IOREMAPS 32 44118616Snjl FIX_IOREMAP_BEGIN, 45118616Snjl FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1, 46118616Snjl __end_of_fixed_addresses 47118616Snjl}; 48118616Snjl 49118616Snjl#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 50118616Snjl/* FIXADDR_BOTTOM might be a better name here... */ 51118616Snjl#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 52118616Snjl 53118616Snjl#include <asm-generic/fixmap.h> 54118616Snjl 55118616Snjl#endif 56118616Snjl