/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
 */

#ifndef _ASM_RISCV_FIXMAP_H
#define _ASM_RISCV_FIXMAP_H

#include <linux/kernel.h>
#include <linux/sizes.h>
#include <linux/pgtable.h>
#include <asm/page.h>

#ifdef CONFIG_MMU
/*
 * Here we define all the compile-time 'special' virtual addresses.
 * The point is to have a constant address at compile time, but to
 * set the physical address only in the boot process.
 *
 * These 'compile-time allocated' memory buffers are page-sized. Use
 * set_fixmap(idx,phys) to associate physical memory with fixmap indices.
 */
enum fixed_addresses {
        FIX_HOLE,
        /*
         * The fdt fixmap mapping must be PMD aligned and will be mapped
         * using PMD entries in fixmap_pmd in 64-bit and a PGD entry in 32-bit.
         */
        FIX_FDT_END,
        FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,

        /* Below fixmaps will be mapped using fixmap_pte */
        FIX_PTE,
        FIX_PMD,
        FIX_PUD,
        FIX_P4D,
        FIX_TEXT_POKE1,
        FIX_TEXT_POKE0,
        FIX_EARLYCON_MEM_BASE,

        __end_of_permanent_fixed_addresses,
        /*
         * Temporary boot-time mappings, used by early_ioremap(),
         * before ioremap() is functional.
         */
#define NR_FIX_BTMAPS           (SZ_256K / PAGE_SIZE)
#define FIX_BTMAPS_SLOTS        7
#define TOTAL_FIX_BTMAPS        (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)

        FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
        FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,

        __end_of_fixed_addresses
};

#define __early_set_fixmap      __set_fixmap

#define __late_set_fixmap       __set_fixmap
#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)

extern void __set_fixmap(enum fixed_addresses idx,
                         phys_addr_t phys, pgprot_t prot);

#include <asm-generic/fixmap.h>

#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_FIXMAP_H */