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, 25*ef69d255SAlexandre Ghiti /* 26*ef69d255SAlexandre Ghiti * The fdt fixmap mapping must be PMD aligned and will be mapped 27*ef69d255SAlexandre Ghiti * using PMD entries in fixmap_pmd in 64-bit and a PGD entry in 32-bit. 28*ef69d255SAlexandre Ghiti */ 29*ef69d255SAlexandre Ghiti FIX_FDT_END, 30*ef69d255SAlexandre Ghiti FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1, 31*ef69d255SAlexandre Ghiti 32*ef69d255SAlexandre Ghiti /* Below fixmaps will be mapped using fixmap_pte */ 33671f9a3eSAnup Patel FIX_PTE, 34671f9a3eSAnup Patel FIX_PMD, 35e8a62cc2SAlexandre Ghiti FIX_PUD, 36677b9eb8SQinglin Pan FIX_P4D, 37043cb41aSZong Li FIX_TEXT_POKE1, 38043cb41aSZong Li FIX_TEXT_POKE0, 39f2c17aabSAnup Patel FIX_EARLYCON_MEM_BASE, 406262f661SAtish Patra 416262f661SAtish Patra __end_of_permanent_fixed_addresses, 426262f661SAtish Patra /* 436262f661SAtish Patra * Temporary boot-time mappings, used by early_ioremap(), 446262f661SAtish Patra * before ioremap() is functional. 456262f661SAtish Patra */ 466262f661SAtish Patra #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) 476262f661SAtish Patra #define FIX_BTMAPS_SLOTS 7 486262f661SAtish Patra #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 496262f661SAtish Patra 506262f661SAtish Patra FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 516262f661SAtish Patra FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 526262f661SAtish Patra 53f2c17aabSAnup Patel __end_of_fixed_addresses 54f2c17aabSAnup Patel }; 55f2c17aabSAnup Patel 56f2c17aabSAnup Patel #define __early_set_fixmap __set_fixmap 57f2c17aabSAnup Patel 58f2c17aabSAnup Patel #define __late_set_fixmap __set_fixmap 59f2c17aabSAnup Patel #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 60f2c17aabSAnup Patel 61f2c17aabSAnup Patel extern void __set_fixmap(enum fixed_addresses idx, 62f2c17aabSAnup Patel phys_addr_t phys, pgprot_t prot); 63f2c17aabSAnup Patel 64f2c17aabSAnup Patel #include <asm-generic/fixmap.h> 65f2c17aabSAnup Patel 666bd33e1eSChristoph Hellwig #endif /* CONFIG_MMU */ 67f2c17aabSAnup Patel #endif /* _ASM_RISCV_FIXMAP_H */ 68