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 <linux/pgtable.h>
  12 #include <asm/page.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         FIX_PTE,
  26         FIX_PMD,
  27         FIX_TEXT_POKE1,
  28         FIX_TEXT_POKE0,
  29         FIX_EARLYCON_MEM_BASE,
  30
  31         __end_of_permanent_fixed_addresses,
  32         /*
  33          * Temporary boot-time mappings, used by early_ioremap(),
  34          * before ioremap() is functional.
  35          */
  36 #define NR_FIX_BTMAPS           (SZ_256K / PAGE_SIZE)
  37 #define FIX_BTMAPS_SLOTS        7
  38 #define TOTAL_FIX_BTMAPS        (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
  39
  40         FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
  41         FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
  42
  43         __end_of_fixed_addresses
  44 };
  45
  46 #define FIXMAP_PAGE_IO          PAGE_KERNEL
  47
  48 #define __early_set_fixmap      __set_fixmap
  49
  50 #define __late_set_fixmap       __set_fixmap
  51 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
  52
  53 extern void __set_fixmap(enum fixed_addresses idx,
  54                          phys_addr_t phys, pgprot_t prot);
  55
  56 #include <asm-generic/fixmap.h>
  57
  58 #endif /* CONFIG_MMU */
  59 #endif /* _ASM_RISCV_FIXMAP_H */