]>
Commit | Line | Data |
---|---|---|
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 | * | |
11 | * Adapted from arch/x86_64 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> | |
61bd93ce | 20 | #include <asm/boot.h> |
bf4b558e MS |
21 | #include <asm/page.h> |
22 | ||
23 | /* | |
24 | * Here we define all the compile-time 'special' virtual | |
25 | * addresses. The point is to have a constant address at | |
26 | * compile time, but to set the physical address only | |
27 | * in the boot process. | |
28 | * | |
29 | * These 'compile-time allocated' memory buffers are | |
30 | * page-sized. Use set_fixmap(idx,phys) to associate | |
31 | * physical memory with fixmap indices. | |
32 | * | |
33 | */ | |
34 | enum fixed_addresses { | |
dab78b6d | 35 | FIX_HOLE, |
61bd93ce AB |
36 | |
37 | /* | |
38 | * Reserve a virtual window for the FDT that is 2 MB larger than the | |
39 | * maximum supported size, and put it at the top of the fixmap region. | |
40 | * The additional space ensures that any FDT that does not exceed | |
41 | * MAX_FDT_SIZE can be mapped regardless of whether it crosses any | |
42 | * 2 MB alignment boundaries. | |
43 | * | |
44 | * Keep this at the top so it remains 2 MB aligned. | |
45 | */ | |
46 | #define FIX_FDT_SIZE (MAX_FDT_SIZE + SZ_2M) | |
47 | FIX_FDT_END, | |
48 | FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1, | |
49 | ||
bf4b558e | 50 | FIX_EARLYCON_MEM_BASE, |
19fc5775 | 51 | FIX_TEXT_POKE0, |
bf4b558e MS |
52 | __end_of_permanent_fixed_addresses, |
53 | ||
54 | /* | |
55 | * Temporary boot-time mappings, used by early_ioremap(), | |
56 | * before ioremap() is functional. | |
57 | */ | |
58 | #ifdef CONFIG_ARM64_64K_PAGES | |
59 | #define NR_FIX_BTMAPS 4 | |
60 | #else | |
61 | #define NR_FIX_BTMAPS 64 | |
62 | #endif | |
63 | #define FIX_BTMAPS_SLOTS 7 | |
64 | #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) | |
65 | ||
66 | FIX_BTMAP_END = __end_of_permanent_fixed_addresses, | |
67 | FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, | |
68 | __end_of_fixed_addresses | |
69 | }; | |
70 | ||
71 | #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) | |
72 | #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) | |
73 | ||
74 | #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) | |
75 | ||
af86e597 | 76 | void __init early_fixmap_init(void); |
bf4b558e | 77 | |
af86e597 LA |
78 | #define __early_set_fixmap __set_fixmap |
79 | ||
b2cedba0 MS |
80 | #define __late_set_fixmap __set_fixmap |
81 | #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) | |
82 | ||
af86e597 | 83 | extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); |
bf4b558e MS |
84 | |
85 | #include <asm-generic/fixmap.h> | |
86 | ||
87 | #endif /* !__ASSEMBLY__ */ | |
88 | #endif /* _ASM_ARM64_FIXMAP_H */ |