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 __ASSEMBLER__ 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_KVM 52 /* One slot per CPU, mapping the guest's VNCR page at EL2. */ 53 FIX_VNCR_END, 54 FIX_VNCR = FIX_VNCR_END + NR_CPUS, 55 #endif 56 57 #ifdef CONFIG_ACPI_APEI_GHES 58 /* Used for GHES mapping from assorted contexts */ 59 FIX_APEI_GHES_IRQ, 60 FIX_APEI_GHES_SEA, 61 #ifdef CONFIG_ARM_SDE_INTERFACE 62 FIX_APEI_GHES_SDEI_NORMAL, 63 FIX_APEI_GHES_SDEI_CRITICAL, 64 #endif 65 #endif /* CONFIG_ACPI_APEI_GHES */ 66 67 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 68 #ifdef CONFIG_RELOCATABLE 69 FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */ 70 #endif 71 FIX_ENTRY_TRAMP_TEXT3, 72 FIX_ENTRY_TRAMP_TEXT2, 73 FIX_ENTRY_TRAMP_TEXT1, 74 #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1)) 75 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ 76 __end_of_permanent_fixed_addresses, 77 78 /* 79 * Temporary boot-time mappings, used by early_ioremap(), 80 * before ioremap() is functional. 81 * 82 * Reserve one extra page so a 256K mapping may start at any 83 * offset within a page. early_ioremap() maps the page-aligned 84 * physical range, so the initial offset can consume an extra page. 85 */ 86 #define NR_FIX_BTMAPS ((SZ_256K / PAGE_SIZE) + 1) 87 #define FIX_BTMAPS_SLOTS 7 88 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 89 90 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 91 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 92 93 /* 94 * Used for kernel page table creation, so unmapped memory may be used 95 * for tables. 96 */ 97 FIX_PTE, 98 FIX_PMD, 99 FIX_PUD, 100 FIX_P4D, 101 FIX_PGD, 102 103 __end_of_fixed_addresses 104 }; 105 106 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 107 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 108 #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 109 #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE) 110 111 #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) 112 113 void __init early_fixmap_init(void); 114 115 #define __early_set_fixmap __set_fixmap 116 117 #define __late_set_fixmap __set_fixmap 118 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 119 120 extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 121 122 #include <asm-generic/fixmap.h> 123 124 #endif /* !__ASSEMBLER__ */ 125 #endif /* _ASM_ARM64_FIXMAP_H */ 126