LXR linux/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 */
  23enum 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
  53extern 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 */
  60