blob: db26a2f2b7a7486ffb690d234aae647b5295189e [file] [log] [blame]
Mark Salterbf4b5582014-04-07 15:39:52 -07001/*
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>
20#include <asm/page.h>
21
22/*
23 * Here we define all the compile-time 'special' virtual
24 * addresses. The point is to have a constant address at
25 * compile time, but to set the physical address only
26 * in the boot process.
27 *
28 * These 'compile-time allocated' memory buffers are
29 * page-sized. Use set_fixmap(idx,phys) to associate
30 * physical memory with fixmap indices.
31 *
32 */
33enum fixed_addresses {
34 FIX_EARLYCON_MEM_BASE,
35 __end_of_permanent_fixed_addresses,
36
37 /*
38 * Temporary boot-time mappings, used by early_ioremap(),
39 * before ioremap() is functional.
40 */
41#ifdef CONFIG_ARM64_64K_PAGES
42#define NR_FIX_BTMAPS 4
43#else
44#define NR_FIX_BTMAPS 64
45#endif
46#define FIX_BTMAPS_SLOTS 7
47#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
48
49 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
50 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
51 __end_of_fixed_addresses
52};
53
54#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
55#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
56
57#define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
58
Laura Abbottaf86e592014-11-21 21:50:42 +000059void __init early_fixmap_init(void);
Mark Salterbf4b5582014-04-07 15:39:52 -070060
Laura Abbottaf86e592014-11-21 21:50:42 +000061#define __early_set_fixmap __set_fixmap
62
63extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
Mark Salterbf4b5582014-04-07 15:39:52 -070064
65#include <asm-generic/fixmap.h>
66
67#endif /* !__ASSEMBLY__ */
68#endif /* _ASM_ARM64_FIXMAP_H */