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/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_ACPI_APEI_GHES
52 /* Used for GHES mapping from assorted contexts */
53 FIX_APEI_GHES_IRQ,
54 FIX_APEI_GHES_SEA,
55 #ifdef CONFIG_ARM_SDE_INTERFACE
56 FIX_APEI_GHES_SDEI_NORMAL,
57 FIX_APEI_GHES_SDEI_CRITICAL,
58 #endif
59 #endif /* CONFIG_ACPI_APEI_GHES */
60
61 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
62 #ifdef CONFIG_RELOCATABLE
63 FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */
64 #endif
65 FIX_ENTRY_TRAMP_TEXT3,
66 FIX_ENTRY_TRAMP_TEXT2,
67 FIX_ENTRY_TRAMP_TEXT1,
68 #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1))
69 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
70 __end_of_permanent_fixed_addresses,
71
72 /*
73 * Temporary boot-time mappings, used by early_ioremap(),
74 * before ioremap() is functional.
75 */
76 #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
77 #define FIX_BTMAPS_SLOTS 7
78 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
79
80 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
81 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
82
83 /*
84 * Used for kernel page table creation, so unmapped memory may be used
85 * for tables.
86 */
87 FIX_PTE,
88 FIX_PMD,
89 FIX_PUD,
90 FIX_P4D,
91 FIX_PGD,
92
93 __end_of_fixed_addresses
94 };
95
96 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
97 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
98 #define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
99 #define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_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
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