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 <asm/page.h> 12 #include <asm/pgtable.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 #define FIX_FDT_SIZE SZ_1M 26 FIX_FDT_END, 27 FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1, 28 FIX_PTE, 29 FIX_PMD, 30 FIX_EARLYCON_MEM_BASE, 31 __end_of_fixed_addresses 32 }; 33 34 #define FIXMAP_PAGE_IO PAGE_KERNEL 35 36 #define __early_set_fixmap __set_fixmap 37 38 #define __late_set_fixmap __set_fixmap 39 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 40 41 extern void __set_fixmap(enum fixed_addresses idx, 42 phys_addr_t phys, pgprot_t prot); 43 44 #include <asm-generic/fixmap.h> 45 46 #endif /* CONFIG_MMU */ 47 #endif /* _ASM_RISCV_FIXMAP_H */ 48