1f2c17aabSAnup Patel /* SPDX-License-Identifier: GPL-2.0 */ 2f2c17aabSAnup Patel /* 3f2c17aabSAnup Patel * Copyright (C) 2019 Western Digital Corporation or its affiliates. 4f2c17aabSAnup Patel */ 5f2c17aabSAnup Patel 6f2c17aabSAnup Patel #ifndef _ASM_RISCV_FIXMAP_H 7f2c17aabSAnup Patel #define _ASM_RISCV_FIXMAP_H 8f2c17aabSAnup Patel 9f2c17aabSAnup Patel #include <linux/kernel.h> 10f2c17aabSAnup Patel #include <linux/sizes.h> 11f2c17aabSAnup Patel #include <asm/page.h> 12f2c17aabSAnup Patel #include <asm/pgtable.h> 13f2c17aabSAnup Patel 14f2c17aabSAnup Patel /* 15f2c17aabSAnup Patel * Here we define all the compile-time 'special' virtual addresses. 16f2c17aabSAnup Patel * The point is to have a constant address at compile time, but to 17f2c17aabSAnup Patel * set the physical address only in the boot process. 18f2c17aabSAnup Patel * 19f2c17aabSAnup Patel * These 'compile-time allocated' memory buffers are page-sized. Use 20f2c17aabSAnup Patel * set_fixmap(idx,phys) to associate physical memory with fixmap indices. 21f2c17aabSAnup Patel */ 22f2c17aabSAnup Patel enum fixed_addresses { 23f2c17aabSAnup Patel FIX_HOLE, 24f2c17aabSAnup Patel FIX_EARLYCON_MEM_BASE, 25f2c17aabSAnup Patel __end_of_fixed_addresses 26f2c17aabSAnup Patel }; 27f2c17aabSAnup Patel 28f2c17aabSAnup Patel #define FIXADDR_SIZE (__end_of_fixed_addresses * PAGE_SIZE) 29f2c17aabSAnup Patel #define FIXADDR_TOP (PAGE_OFFSET) 30f2c17aabSAnup Patel #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 31f2c17aabSAnup Patel 32f2c17aabSAnup Patel #define FIXMAP_PAGE_IO PAGE_KERNEL 33f2c17aabSAnup Patel 34f2c17aabSAnup Patel #define __early_set_fixmap __set_fixmap 35f2c17aabSAnup Patel 36f2c17aabSAnup Patel #define __late_set_fixmap __set_fixmap 37f2c17aabSAnup Patel #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 38f2c17aabSAnup Patel 39f2c17aabSAnup Patel extern void __set_fixmap(enum fixed_addresses idx, 40f2c17aabSAnup Patel phys_addr_t phys, pgprot_t prot); 41f2c17aabSAnup Patel 42f2c17aabSAnup Patel #include <asm-generic/fixmap.h> 43f2c17aabSAnup Patel 44f2c17aabSAnup Patel #endif /* _ASM_RISCV_FIXMAP_H */ 45