2 * fixmap.h: compile-time virtual memory allocation
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
8 * Copyright (C) 1998 Ingo Molnar
9 * Copyright (C) 2013 Mark Salter <msalter@redhat.com>
11 * Adapted from arch/x86_64 version.
15 #ifndef _ASM_ARM64_FIXMAP_H
16 #define _ASM_ARM64_FIXMAP_H
19 #include <linux/kernel.h>
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.
28 * These 'compile-time allocated' memory buffers are
29 * page-sized. Use set_fixmap(idx,phys) to associate
30 * physical memory with fixmap indices.
33 enum fixed_addresses {
35 FIX_EARLYCON_MEM_BASE,
37 __end_of_permanent_fixed_addresses,
40 * Temporary boot-time mappings, used by early_ioremap(),
41 * before ioremap() is functional.
43 #ifdef CONFIG_ARM64_64K_PAGES
44 #define NR_FIX_BTMAPS 4
46 #define NR_FIX_BTMAPS 64
48 #define FIX_BTMAPS_SLOTS 7
49 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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
56 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
57 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
59 #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
61 void __init early_fixmap_init(void);
63 #define __early_set_fixmap __set_fixmap
65 extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
67 #include <asm-generic/fixmap.h>
69 #endif /* !__ASSEMBLY__ */
70 #endif /* _ASM_ARM64_FIXMAP_H */