arch/riscv/include/asm/fixmap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2019 Western Digital Corporation or its affiliates.
   4  */
   5
   6 #ifndef _ASM_RISCV_FIXMAP_H
   7 #define _ASM_RISCV_FIXMAP_H
   8
   9 #include <linux/kernel.h>
  10 #include <linux/sizes.h>
  11 #include <asm/page.h>
  12 #include <asm/pgtable.h>
  13
  14 /*
  15  * Here we define all the compile-time 'special' virtual addresses.
  16  * The point is to have a constant address at compile time, but to
  17  * set the physical address only in the boot process.
  18  *
  19  * These 'compile-time allocated' memory buffers are page-sized. Use
  20  * set_fixmap(idx,phys) to associate physical memory with fixmap indices.
  21  */
  22 enum fixed_addresses {
  23         FIX_HOLE,
  24         FIX_EARLYCON_MEM_BASE,
  25         __end_of_fixed_addresses
  26 };
  27
  28 #define FIXADDR_SIZE            (__end_of_fixed_addresses * PAGE_SIZE)
  29 #define FIXADDR_TOP             (PAGE_OFFSET)
  30 #define FIXADDR_START           (FIXADDR_TOP - FIXADDR_SIZE)
  31
  32 #define FIXMAP_PAGE_IO          PAGE_KERNEL
  33
  34 #define __early_set_fixmap      __set_fixmap
  35
  36 #define __late_set_fixmap       __set_fixmap
  37 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
  38
  39 extern void __set_fixmap(enum fixed_addresses idx,
  40                          phys_addr_t phys, pgprot_t prot);
  41
  42 #include <asm-generic/fixmap.h>
  43
  44 #endif /* _ASM_RISCV_FIXMAP_H */