arch/openrisc/include/asm/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
  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