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bf4b558e MS |
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 | * | |
5d3c2c35 | 11 | * Adapted from arch/x86 version. |
bf4b558e MS |
12 | * |
13 | */ | |
14 | ||
15 | #ifndef _ASM_ARM64_FIXMAP_H | |
16 | #define _ASM_ARM64_FIXMAP_H | |
17 | ||
18 | #ifndef __ASSEMBLY__ | |
19 | #include <linux/kernel.h> | |
e25781e3 | 20 | #include <linux/sizes.h> |
61bd93ce | 21 | #include <asm/boot.h> |
bf4b558e | 22 | #include <asm/page.h> |
3eca86e7 | 23 | #include <asm/pgtable-prot.h> |
bf4b558e MS |
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 | * These 'compile-time allocated' memory buffers are | |
32 | * page-sized. Use set_fixmap(idx,phys) to associate | |
33 | * physical memory with fixmap indices. | |
34 | * | |
35 | */ | |
36 | enum fixed_addresses { | |
dab78b6d | 37 | FIX_HOLE, |
61bd93ce AB |
38 | |
39 | /* | |
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. | |
45 | * | |
46 | * Keep this at the top so it remains 2 MB aligned. | |
47 | */ | |
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, | |
51 | ||
bf4b558e | 52 | FIX_EARLYCON_MEM_BASE, |
19fc5775 | 53 | FIX_TEXT_POKE0, |
eda363b2 JM |
54 | |
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 */ | |
60 | ||
90223cb6 | 61 | #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 |
16c88796 | 62 | FIX_ENTRY_TRAMP_DATA, |
90223cb6 WD |
63 | FIX_ENTRY_TRAMP_TEXT, |
64 | #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT)) | |
65 | #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ | |
bf4b558e MS |
66 | __end_of_permanent_fixed_addresses, |
67 | ||
68 | /* | |
69 | * Temporary boot-time mappings, used by early_ioremap(), | |
70 | * before ioremap() is functional. | |
71 | */ | |
e25781e3 | 72 | #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) |
bf4b558e MS |
73 | #define FIX_BTMAPS_SLOTS 7 |
74 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) | |
75 | ||
76 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses, | |
77 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, | |
961faac1 MR |
78 | |
79 | /* | |
80 | * Used for kernel page table creation, so unmapped memory may be used | |
81 | * for tables. | |
82 | */ | |
83 | FIX_PTE, | |
84 | FIX_PMD, | |
85 | FIX_PUD, | |
86 | FIX_PGD, | |
87 | ||
bf4b558e MS |
88 | __end_of_fixed_addresses |
89 | }; | |
90 | ||
91 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) | |
92 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | |
93 | ||
94 | #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) | |
95 | ||
af86e597 | 96 | void __init early_fixmap_init(void); |
bf4b558e | 97 | |
af86e597 LA |
98 | #define __early_set_fixmap __set_fixmap |
99 | ||
b2cedba0 MS |
100 | #define __late_set_fixmap __set_fixmap |
101 | #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) | |
102 | ||
af86e597 | 103 | extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); |
bf4b558e MS |
104 | |
105 | #include <asm-generic/fixmap.h> | |
106 | ||
107 | #endif /* !__ASSEMBLY__ */ | |
108 | #endif /* _ASM_ARM64_FIXMAP_H */ |