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         /*
  26          * The fdt fixmap mapping must be PMD aligned and will be mapped
  27          * using PMD entries in fixmap_pmd in 64-bit and a PGD entry in 32-bit.
  28          */
  29         FIX_FDT_END,
  30         FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
  31
  32         /* Below fixmaps will be mapped using fixmap_pte */
  33         FIX_PTE,
  34         FIX_PMD,
  35         FIX_PUD,
  36         FIX_P4D,
  37         FIX_TEXT_POKE1,
  38         FIX_TEXT_POKE0,
  39         FIX_EARLYCON_MEM_BASE,
  40
  41         __end_of_permanent_fixed_addresses,
  42         /*
  43          * Temporary boot-time mappings, used by early_ioremap(),
  44          * before ioremap() is functional.
  45          */
  46 #define NR_FIX_BTMAPS           (SZ_256K / PAGE_SIZE)
  47 #define FIX_BTMAPS_SLOTS        7
  48 #define TOTAL_FIX_BTMAPS        (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
  49
  50         FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
  51         FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
  52
  53         __end_of_fixed_addresses
  54 };
  55
  56 #define __early_set_fixmap      __set_fixmap
  57
  58 #define __late_set_fixmap       __set_fixmap
  59 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
  60
  61 extern void __set_fixmap(enum fixed_addresses idx,
  62                          phys_addr_t phys, pgprot_t prot);
  63
  64 #include <asm-generic/fixmap.h>
  65
  66 #endif /* CONFIG_MMU */
  67 #endif /* _ASM_RISCV_FIXMAP_H */