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 /* 15 * Here we define all the compile-time 'special' virtual addresses. 16 * The point is to have a constant address at compile time, but to 17 * set the physical address only in the boot process. 18 * 19 * These 'compile-time allocated' memory buffers are page-sized. Use 20 * set_fixmap(idx,phys) to associate physical memory with fixmap indices. 21 */ 22 enum fixed_addresses { 23 FIX_HOLE, 24 #define FIX_FDT_SIZE SZ_1M 25 FIX_FDT_END, 26 FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1, 27 FIX_PTE, 28 FIX_PMD, 29 FIX_EARLYCON_MEM_BASE, 30 __end_of_fixed_addresses 31 }; 32 33 #define FIXADDR_SIZE (__end_of_fixed_addresses * PAGE_SIZE) 34 #define FIXADDR_TOP (VMALLOC_START) 35 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 36 37 #define FIXMAP_PAGE_IO PAGE_KERNEL 38 39 #define __early_set_fixmap __set_fixmap 40 41 #define __late_set_fixmap __set_fixmap 42 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 43 44 extern void __set_fixmap(enum fixed_addresses idx, 45 phys_addr_t phys, pgprot_t prot); 46 47 #include <asm-generic/fixmap.h> 48 49 #endif /* _ASM_RISCV_FIXMAP_H */ 50