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 29 enum 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 39 extern 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 45