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 #ifdef CONFIG_MMU
  15 /*
  16  * Here we define all the compile-time 'special' virtual addresses.
  17  * The point is to have a constant address at compile time, but to
  18  * set the physical address only in the boot process.
  19  *
  20  * These 'compile-time allocated' memory buffers are page-sized. Use
  21  * set_fixmap(idx,phys) to associate physical memory with fixmap indices.
  22  */
  23 enum fixed_addresses {
  24         FIX_HOLE,
  25 #define FIX_FDT_SIZE    SZ_1M
  26         FIX_FDT_END,
  27         FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
  28         FIX_PTE,
  29         FIX_PMD,
  30         FIX_EARLYCON_MEM_BASE,
  31         __end_of_fixed_addresses
  32 };
  33
  34 #define FIXMAP_PAGE_IO          PAGE_KERNEL
  35
  36 #define __early_set_fixmap      __set_fixmap
  37
  38 #define __late_set_fixmap       __set_fixmap
  39 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
  40
  41 extern void __set_fixmap(enum fixed_addresses idx,
  42                          phys_addr_t phys, pgprot_t prot);
  43
  44 #include <asm-generic/fixmap.h>
  45
  46 #endif /* CONFIG_MMU */
  47 #endif /* _ASM_RISCV_FIXMAP_H */