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/sizes.h> 21 #include <asm/boot.h> 22 #include <asm/page.h> 23 #include <asm/pgtable-prot.h> 24 25 /* 26 * Here we define all the compile-time 'special' virtual 27 * addresses. The point is to have a constant address at 28 * compile time, but to set the physical address only 29 * in the boot process. 30 * 31 * Each enum increment in these 'compile-time allocated' 32 * memory buffers is page-sized. Use set_fixmap(idx,phys) 33 * to associate physical memory with a fixmap index. 34 */ 35 enum fixed_addresses { 36 FIX_HOLE, 37 38 /* 39 * Reserve a virtual window for the FDT that is 2 MB larger than the 40 * maximum supported size, and put it at the top of the fixmap region. 41 * The additional space ensures that any FDT that does not exceed 42 * MAX_FDT_SIZE can be mapped regardless of whether it crosses any 43 * 2 MB alignment boundaries. 44 * 45 * Keep this at the top so it remains 2 MB aligned. 46 */ 47 #define FIX_FDT_SIZE (MAX_FDT_SIZE + SZ_2M) 48 FIX_FDT_END, 49 FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1, 50 51 FIX_EARLYCON_MEM_BASE, 52 FIX_TEXT_POKE0, 53 54 #ifdef CONFIG_ACPI_APEI_GHES 55 /* Used for GHES mapping from assorted contexts */ 56 FIX_APEI_GHES_IRQ, 57 FIX_APEI_GHES_SEA, 58 #ifdef CONFIG_ARM_SDE_INTERFACE 59 FIX_APEI_GHES_SDEI_NORMAL, 60 FIX_APEI_GHES_SDEI_CRITICAL, 61 #endif 62 #endif /* CONFIG_ACPI_APEI_GHES */ 63 64 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 65 #ifdef CONFIG_RELOCATABLE 66 FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */ 67 #endif 68 FIX_ENTRY_TRAMP_TEXT3, 69 FIX_ENTRY_TRAMP_TEXT2, 70 FIX_ENTRY_TRAMP_TEXT1, 71 #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1)) 72 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ 73 __end_of_permanent_fixed_addresses, 74 75 /* 76 * Temporary boot-time mappings, used by early_ioremap(), 77 * before ioremap() is functional. 78 */ 79 #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) 80 #define FIX_BTMAPS_SLOTS 7 81 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 82 83 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 84 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 85 86 /* 87 * Used for kernel page table creation, so unmapped memory may be used 88 * for tables. 89 */ 90 FIX_PTE, 91 FIX_PMD, 92 FIX_PUD, 93 FIX_PGD, 94 95 __end_of_fixed_addresses 96 }; 97 98 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 99 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_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