1 /* 2 * fixmap.h: compile-time virtual memory allocation 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1998 Ingo Molnar 9 * Copyright (C) 2013 Mark Salter <msalter@redhat.com> 10 * 11 * Adapted from arch/x86 version. 12 * 13 */ 14 15 #ifndef _ASM_ARM64_FIXMAP_H 16 #define _ASM_ARM64_FIXMAP_H 17 18 #ifndef __ASSEMBLY__ 19 #include <linux/kernel.h> 20 #include <linux/math.h> 21 #include <linux/sizes.h> 22 #include <asm/boot.h> 23 #include <asm/page.h> 24 #include <asm/pgtable-prot.h> 25 26 /* 27 * Here we define all the compile-time 'special' virtual 28 * addresses. The point is to have a constant address at 29 * compile time, but to set the physical address only 30 * in the boot process. 31 * 32 * Each enum increment in these 'compile-time allocated' 33 * memory buffers is page-sized. Use set_fixmap(idx,phys) 34 * to associate physical memory with a fixmap index. 35 */ 36 enum fixed_addresses { 37 FIX_HOLE, 38 39 /* 40 * Reserve a virtual window for the FDT that is a page bigger than the 41 * maximum supported size. The additional space ensures that any FDT 42 * that does not exceed MAX_FDT_SIZE can be mapped regardless of 43 * whether it crosses any page boundary. 44 */ 45 FIX_FDT_END, 46 FIX_FDT = FIX_FDT_END + DIV_ROUND_UP(MAX_FDT_SIZE, PAGE_SIZE) + 1, 47 48 FIX_EARLYCON_MEM_BASE, 49 FIX_TEXT_POKE0, 50 51 #ifdef CONFIG_ACPI_APEI_GHES 52 /* Used for GHES mapping from assorted contexts */ 53 FIX_APEI_GHES_IRQ, 54 FIX_APEI_GHES_SEA, 55 #ifdef CONFIG_ARM_SDE_INTERFACE 56 FIX_APEI_GHES_SDEI_NORMAL, 57 FIX_APEI_GHES_SDEI_CRITICAL, 58 #endif 59 #endif /* CONFIG_ACPI_APEI_GHES */ 60 61 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 62 #ifdef CONFIG_RELOCATABLE 63 FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */ 64 #endif 65 FIX_ENTRY_TRAMP_TEXT3, 66 FIX_ENTRY_TRAMP_TEXT2, 67 FIX_ENTRY_TRAMP_TEXT1, 68 #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1)) 69 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ 70 __end_of_permanent_fixed_addresses, 71 72 /* 73 * Temporary boot-time mappings, used by early_ioremap(), 74 * before ioremap() is functional. 75 */ 76 #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) 77 #define FIX_BTMAPS_SLOTS 7 78 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 79 80 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 81 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 82 83 /* 84 * Used for kernel page table creation, so unmapped memory may be used 85 * for tables. 86 */ 87 FIX_PTE, 88 FIX_PMD, 89 FIX_PUD, 90 FIX_P4D, 91 FIX_PGD, 92 93 __end_of_fixed_addresses 94 }; 95 96 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 97 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 98 #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 99 #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) 100 101 #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) 102 103 void __init early_fixmap_init(void); 104 105 #define __early_set_fixmap __set_fixmap 106 107 #define __late_set_fixmap __set_fixmap 108 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 109 110 extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 111 112 #include <asm-generic/fixmap.h> 113 114 #endif /* !__ASSEMBLY__ */ 115 #endif /* _ASM_ARM64_FIXMAP_H */ 116