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[linux/fpc-iii.git] / arch / arm64 / include / asm / fixmap.h
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1 /*
2 * fixmap.h: compile-time virtual memory allocation
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.
8 * Copyright (C) 1998 Ingo Molnar
9 * Copyright (C) 2013 Mark Salter <msalter@redhat.com>
11 * Adapted from arch/x86 version.
15 #ifndef _ASM_ARM64_FIXMAP_H
16 #define _ASM_ARM64_FIXMAP_H
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>
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.
31 * These 'compile-time allocated' memory buffers are
32 * page-sized. Use set_fixmap(idx,phys) to associate
33 * physical memory with fixmap indices.
36 enum fixed_addresses {
37 FIX_HOLE,
40 * Reserve a virtual window for the FDT that is 2 MB larger than the
41 * maximum supported size, and put it at the top of the fixmap region.
42 * The additional space ensures that any FDT that does not exceed
43 * MAX_FDT_SIZE can be mapped regardless of whether it crosses any
44 * 2 MB alignment boundaries.
46 * Keep this at the top so it remains 2 MB aligned.
48 #define FIX_FDT_SIZE (MAX_FDT_SIZE + SZ_2M)
49 FIX_FDT_END,
50 FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
52 FIX_EARLYCON_MEM_BASE,
53 FIX_TEXT_POKE0,
55 #ifdef CONFIG_ACPI_APEI_GHES
56 /* Used for GHES mapping from assorted contexts */
57 FIX_APEI_GHES_IRQ,
58 FIX_APEI_GHES_NMI,
59 #endif /* CONFIG_ACPI_APEI_GHES */
61 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
62 FIX_ENTRY_TRAMP_DATA,
63 FIX_ENTRY_TRAMP_TEXT,
64 #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT))
65 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
66 __end_of_permanent_fixed_addresses,
69 * Temporary boot-time mappings, used by early_ioremap(),
70 * before ioremap() is functional.
72 #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
73 #define FIX_BTMAPS_SLOTS 7
74 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
76 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
77 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
80 * Used for kernel page table creation, so unmapped memory may be used
81 * for tables.
83 FIX_PTE,
84 FIX_PMD,
85 FIX_PUD,
86 FIX_PGD,
88 __end_of_fixed_addresses
91 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
92 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
94 #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
96 void __init early_fixmap_init(void);
98 #define __early_set_fixmap __set_fixmap
100 #define __late_set_fixmap __set_fixmap
101 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
103 extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
105 #include <asm-generic/fixmap.h>
107 #endif /* !__ASSEMBLY__ */
108 #endif /* _ASM_ARM64_FIXMAP_H */