| 1 | |
| 2 | * fixmap.h: compile-time virtual memory allocation
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| 3 | *
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| 4 | * This file is subject to the terms and conditions of the GNU General Public
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| 5 | * License. See the file "COPYING" in the main directory of this archive
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| 6 | * for more details.
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| 7 | *
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| 8 | * Copyright (C) 1998 Ingo Molnar
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| 9 | *
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| 10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
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| 11 | * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
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| 12 |
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| 13 |
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| 14 | #ifndef _ASM_X86_FIXMAP_H
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| 15 | #define _ASM_X86_FIXMAP_H
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| 16 |
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| 17 | #include <asm/kmap_size.h>
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| 18 |
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| 19 | |
| 20 | * Exposed to assembly code for setting up initial page tables. Cannot be
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| 21 | * calculated in assembly code (fixmap entries are an enum), but is sanity
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| 22 | * checked in the actual fixmap C code to make sure that the fixmap is
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| 23 | * covered fully.
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| 24 |
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| 25 | #ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP
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| 26 | # define FIXMAP_PMD_NUM 2
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| 27 | #else
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| 28 | # define KM_PMDS (KM_MAX_IDX * ((CONFIG_NR_CPUS + 511) / 512))
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| 29 | # define FIXMAP_PMD_NUM (KM_PMDS + 2)
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| 30 | #endif
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| 31 |
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| 32 | #define FIXMAP_PMD_TOP 507
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| 33 |
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| 34 | #ifndef __ASSEMBLER__
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| 35 | #include <linux/kernel.h>
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| 36 | #include <asm/apicdef.h>
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| 37 | #include <asm/page.h>
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| 38 | #include <asm/pgtable_types.h>
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| 39 | #ifdef CONFIG_X86_32
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| 40 | #include <linux/threads.h>
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| 41 | #else
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| 42 | #include <uapi/asm/vsyscall.h>
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| 43 | #endif
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| 44 |
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| 45 | |
| 46 | * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
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| 47 | * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
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| 48 | * Because of this, FIXADDR_TOP x86 integration was left as later work.
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| 49 |
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| 50 | #ifdef CONFIG_X86_32
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| 51 | |
| 52 | * Leave one empty page between vmalloc'ed areas and
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| 53 | * the start of the fixmap.
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| 54 |
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| 55 | extern unsigned long __FIXADDR_TOP;
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| 56 | #define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
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| 57 | #else
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| 58 | #define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
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| 59 | PAGE_SIZE)
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| 60 | #endif
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| 61 |
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| 62 | |
| 63 | * Here we define all the compile-time 'special' virtual
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| 64 | * addresses. The point is to have a constant address at
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| 65 | * compile time, but to set the physical address only
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| 66 | * in the boot process.
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| 67 | * for x86_32: We allocate these special addresses
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| 68 | * from the end of virtual memory (0xfffff000) backwards.
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| 69 | * Also this lets us do fail-safe vmalloc(), we
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| 70 | * can guarantee that these special addresses and
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| 71 | * vmalloc()-ed addresses never overlap.
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| 72 | *
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| 73 | * These 'compile-time allocated' memory buffers are
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| 74 | * fixed-size 4k pages (or larger if used with an increment
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| 75 | * higher than 1). Use set_fixmap(idx,phys) to associate
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| 76 | * physical memory with fixmap indices.
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| 77 | *
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| 78 | * TLB entries of such buffers will not be flushed across
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| 79 | * task switches.
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| 80 |
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| 81 | enum fixed_addresses {
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| 82 | #ifdef CONFIG_X86_32
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| 83 | FIX_HOLE,
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| 84 | #else
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| 85 | #ifdef CONFIG_X86_VSYSCALL_EMULATION
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| 86 | VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
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| 87 | #endif
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| 88 | #endif
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| 89 | FIX_DBGP_BASE,
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| 90 | FIX_EARLYCON_MEM_BASE,
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| 91 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
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| 92 | FIX_OHCI1394_BASE,
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| 93 | #endif
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| 94 | #ifdef CONFIG_X86_LOCAL_APIC
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| 95 | FIX_APIC_BASE,
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| 96 | #endif
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| 97 | #ifdef CONFIG_X86_IO_APIC
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| 98 | FIX_IO_APIC_BASE_0,
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| 99 | FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
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| 100 | #endif
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| 101 | #ifdef CONFIG_KMAP_LOCAL
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| 102 | FIX_KMAP_BEGIN,
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| 103 | FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
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| 104 | #ifdef CONFIG_PCI_MMCONFIG
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| 105 | FIX_PCIE_MCFG,
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| 106 | #endif
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| 107 | #endif
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| 108 | #ifdef CONFIG_PARAVIRT_XXL
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| 109 | FIX_PARAVIRT_BOOTMAP,
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| 110 | #endif
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| 111 |
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| 112 | #ifdef CONFIG_ACPI_APEI_GHES
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| 113 |
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| 114 | FIX_APEI_GHES_IRQ,
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| 115 | FIX_APEI_GHES_NMI,
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| 116 | #endif
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| 117 |
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| 118 | __end_of_permanent_fixed_addresses,
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| 119 |
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| 120 | |
| 121 | * 512 temporary boot-time mappings, used by early_ioremap(),
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| 122 | * before ioremap() is functional.
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| 123 | *
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| 124 | * If necessary we round it up to the next 512 pages boundary so
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| 125 | * that we can have a single pmd entry and a single pte table:
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| 126 |
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| 127 | #define NR_FIX_BTMAPS 64
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| 128 | #define FIX_BTMAPS_SLOTS 8
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| 129 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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| 130 | FIX_BTMAP_END =
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| 131 | (__end_of_permanent_fixed_addresses ^
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| 132 | (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
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| 133 | -PTRS_PER_PTE
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| 134 | ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
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| 135 | (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
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| 136 | : __end_of_permanent_fixed_addresses,
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| 137 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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| 138 | #ifdef CONFIG_X86_32
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| 139 | FIX_WP_TEST,
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| 140 | #endif
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| 141 | #ifdef CONFIG_INTEL_TXT
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| 142 | FIX_TBOOT_BASE,
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| 143 | #endif
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| 144 | __end_of_fixed_addresses
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| 145 | };
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| 146 |
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| 147 |
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| 148 | extern void reserve_top_address(unsigned long reserve);
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| 149 |
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| 150 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
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| 151 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
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| 152 | #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
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| 153 | #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
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| 154 |
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| 155 | extern int fixmaps_set;
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| 156 |
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| 157 | extern pte_t *pkmap_page_table;
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| 158 |
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| 159 | void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
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| 160 | void native_set_fixmap(unsigned idx,
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| 161 | phys_addr_t phys, pgprot_t flags);
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| 162 |
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| 163 | #ifndef CONFIG_PARAVIRT_XXL
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| 164 | static inline void __set_fixmap(enum fixed_addresses idx,
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| 165 | phys_addr_t phys, pgprot_t flags)
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| 166 | {
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| 167 | native_set_fixmap(idx, phys, flags);
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| 168 | }
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| 169 | #endif
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| 170 |
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| 171 | |
| 172 | * FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
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| 173 | * supported for MMIO addresses, so make sure that the memory encryption
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| 174 | * mask is not part of the page attributes.
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| 175 |
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| 176 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
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| 177 |
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| 178 | |
| 179 | * Early memremap routines used for in-place encryption. The mappings created
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| 180 | * by these routines are intended to be used as temporary mappings.
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| 181 |
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| 182 | void __init *early_memremap_encrypted(resource_size_t phys_addr,
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| 183 | unsigned long size);
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| 184 | void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
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| 185 | unsigned long size);
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| 186 | void __init *early_memremap_decrypted(resource_size_t phys_addr,
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| 187 | unsigned long size);
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| 188 | void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
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| 189 | unsigned long size);
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| 190 |
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| 191 | #include <asm-generic/fixmap.h>
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| 192 |
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| 193 | #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
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| 194 | #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
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| 195 |
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| 196 | void __early_set_fixmap(enum fixed_addresses idx,
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| 197 | phys_addr_t phys, pgprot_t flags);
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| 198 |
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| 199 | #endif
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| 200 | #endif
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