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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 */
35enum 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
103void __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
110extern 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 */