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>
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_HOLE,
35	FIX_EARLYCON_MEM_BASE,
36	FIX_TEXT_POKE0,
37	__end_of_permanent_fixed_addresses,
38
39	/*
40	 * Temporary boot-time mappings, used by early_ioremap(),
41	 * before ioremap() is functional.
42	 */
43#ifdef CONFIG_ARM64_64K_PAGES
44#define NR_FIX_BTMAPS		4
45#else
46#define NR_FIX_BTMAPS		64
47#endif
48#define FIX_BTMAPS_SLOTS	7
49#define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
50
51	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
52	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
53	__end_of_fixed_addresses
54};
55
56#define FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)
57#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)
58
59#define FIXMAP_PAGE_IO     __pgprot(PROT_DEVICE_nGnRE)
60
61void __init early_fixmap_init(void);
62
63#define __early_set_fixmap __set_fixmap
64
65#define __late_set_fixmap __set_fixmap
66#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
67
68extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
69
70#include <asm-generic/fixmap.h>
71
72#endif /* !__ASSEMBLY__ */
73#endif /* _ASM_ARM64_FIXMAP_H */
74