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> 11ca5999fdSMike Rapoport #include <linux/pgtable.h> 1265fddcfcSMike Rapoport #include <asm/page.h> 13f2c17aabSAnup Patel 146bd33e1eSChristoph Hellwig #ifdef CONFIG_MMU 15f2c17aabSAnup Patel /* 16f2c17aabSAnup Patel * Here we define all the compile-time 'special' virtual addresses. 17f2c17aabSAnup Patel * The point is to have a constant address at compile time, but to 18f2c17aabSAnup Patel * set the physical address only in the boot process. 19f2c17aabSAnup Patel * 20f2c17aabSAnup Patel * These 'compile-time allocated' memory buffers are page-sized. Use 21f2c17aabSAnup Patel * set_fixmap(idx,phys) to associate physical memory with fixmap indices. 22f2c17aabSAnup Patel */ 23f2c17aabSAnup Patel enum fixed_addresses { 24f2c17aabSAnup Patel FIX_HOLE, 25671f9a3eSAnup Patel FIX_PTE, 26671f9a3eSAnup Patel FIX_PMD, 27043cb41aSZong Li FIX_TEXT_POKE1, 28043cb41aSZong Li FIX_TEXT_POKE0, 29f2c17aabSAnup Patel FIX_EARLYCON_MEM_BASE, 30*6262f661SAtish Patra 31*6262f661SAtish Patra __end_of_permanent_fixed_addresses, 32*6262f661SAtish Patra /* 33*6262f661SAtish Patra * Temporary boot-time mappings, used by early_ioremap(), 34*6262f661SAtish Patra * before ioremap() is functional. 35*6262f661SAtish Patra */ 36*6262f661SAtish Patra #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) 37*6262f661SAtish Patra #define FIX_BTMAPS_SLOTS 7 38*6262f661SAtish Patra #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 39*6262f661SAtish Patra 40*6262f661SAtish Patra FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 41*6262f661SAtish Patra FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 42*6262f661SAtish Patra 43f2c17aabSAnup Patel __end_of_fixed_addresses 44f2c17aabSAnup Patel }; 45f2c17aabSAnup Patel 46f2c17aabSAnup Patel #define FIXMAP_PAGE_IO PAGE_KERNEL 47f2c17aabSAnup Patel 48f2c17aabSAnup Patel #define __early_set_fixmap __set_fixmap 49f2c17aabSAnup Patel 50f2c17aabSAnup Patel #define __late_set_fixmap __set_fixmap 51f2c17aabSAnup Patel #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 52f2c17aabSAnup Patel 53f2c17aabSAnup Patel extern void __set_fixmap(enum fixed_addresses idx, 54f2c17aabSAnup Patel phys_addr_t phys, pgprot_t prot); 55f2c17aabSAnup Patel 56f2c17aabSAnup Patel #include <asm-generic/fixmap.h> 57f2c17aabSAnup Patel 586bd33e1eSChristoph Hellwig #endif /* CONFIG_MMU */ 59f2c17aabSAnup Patel #endif /* _ASM_RISCV_FIXMAP_H */ 60