root/arch/riscv/include/asm/fixmap.h

INCLUDED FROM

   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 #define FIX_FDT_SIZE    SZ_1M
  25         FIX_FDT_END,
  26         FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
  27         FIX_PTE,
  28         FIX_PMD,
  29         FIX_EARLYCON_MEM_BASE,
  30         __end_of_fixed_addresses
  31 };
  32 
  33 #define FIXMAP_PAGE_IO          PAGE_KERNEL
  34 
  35 #define __early_set_fixmap      __set_fixmap
  36 
  37 #define __late_set_fixmap       __set_fixmap
  38 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
  39 
  40 extern void __set_fixmap(enum fixed_addresses idx,
  41                          phys_addr_t phys, pgprot_t prot);
  42 
  43 #include <asm-generic/fixmap.h>
  44 
  45 #endif /* _ASM_RISCV_FIXMAP_H */