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_PUD, 28 FIX_P4D, 29 FIX_TEXT_POKE1, 30 FIX_TEXT_POKE0, 31 FIX_EARLYCON_MEM_BASE, 32 33 __end_of_permanent_fixed_addresses, 34 /* 35 * Temporary boot-time mappings, used by early_ioremap(), 36 * before ioremap() is functional. 37 */ 38 #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) 39 #define FIX_BTMAPS_SLOTS 7 40 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 41 42 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 43 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 44 45 __end_of_fixed_addresses 46 }; 47 48 #define FIXMAP_PAGE_IO PAGE_KERNEL 49 50 #define __early_set_fixmap __set_fixmap 51 52 #define __late_set_fixmap __set_fixmap 53 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 54 55 extern void __set_fixmap(enum fixed_addresses idx, 56 phys_addr_t phys, pgprot_t prot); 57 58 #include <asm-generic/fixmap.h> 59 60 #endif /* CONFIG_MMU */ 61 #endif /* _ASM_RISCV_FIXMAP_H */ 62