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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 version.
12 *
13 */
14
15#ifndef _ASM_ARM64_FIXMAP_H
16#define _ASM_ARM64_FIXMAP_H
17
18#ifndef __ASSEMBLER__
19#include <linux/kernel.h>
20#include <linux/math.h>
21#include <linux/sizes.h>
22#include <asm/boot.h>
23#include <asm/page.h>
24#include <asm/pgtable-prot.h>
25
26/*
27 * Here we define all the compile-time 'special' virtual
28 * addresses. The point is to have a constant address at
29 * compile time, but to set the physical address only
30 * in the boot process.
31 *
32 * Each enum increment in these 'compile-time allocated'
33 * memory buffers is page-sized. Use set_fixmap(idx,phys)
34 * to associate physical memory with a fixmap index.
35 */
36enum fixed_addresses {
37 FIX_HOLE,
38
39 /*
40 * Reserve a virtual window for the FDT that is a page bigger than the
41 * maximum supported size. The additional space ensures that any FDT
42 * that does not exceed MAX_FDT_SIZE can be mapped regardless of
43 * whether it crosses any page boundary.
44 */
45 FIX_FDT_END,
46 FIX_FDT = FIX_FDT_END + DIV_ROUND_UP(MAX_FDT_SIZE, PAGE_SIZE) + 1,
47
48 FIX_EARLYCON_MEM_BASE,
49 FIX_TEXT_POKE0,
50
51#ifdef CONFIG_KVM
52 /* One slot per CPU, mapping the guest's VNCR page at EL2. */
53 FIX_VNCR_END,
54 FIX_VNCR = FIX_VNCR_END + NR_CPUS,
55#endif
56
57#ifdef CONFIG_ACPI_APEI_GHES
58 /* Used for GHES mapping from assorted contexts */
59 FIX_APEI_GHES_IRQ,
60 FIX_APEI_GHES_SEA,
61#ifdef CONFIG_ARM_SDE_INTERFACE
62 FIX_APEI_GHES_SDEI_NORMAL,
63 FIX_APEI_GHES_SDEI_CRITICAL,
64#endif
65#endif /* CONFIG_ACPI_APEI_GHES */
66
67#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
68#ifdef CONFIG_RELOCATABLE
69 FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */
70#endif
71 FIX_ENTRY_TRAMP_TEXT3,
72 FIX_ENTRY_TRAMP_TEXT2,
73 FIX_ENTRY_TRAMP_TEXT1,
74#define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1))
75#endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
76 __end_of_permanent_fixed_addresses,
77
78 /*
79 * Temporary boot-time mappings, used by early_ioremap(),
80 * before ioremap() is functional.
81 */
82#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
83#define FIX_BTMAPS_SLOTS 7
84#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
85
86 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
87 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
88
89 /*
90 * Used for kernel page table creation, so unmapped memory may be used
91 * for tables.
92 */
93 FIX_PTE,
94 FIX_PMD,
95 FIX_PUD,
96 FIX_P4D,
97 FIX_PGD,
98
99 __end_of_fixed_addresses
100};
101
102#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
103#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
104#define FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
105#define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
106
107#define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
108
109void __init early_fixmap_init(void);
110
111#define __early_set_fixmap __set_fixmap
112
113#define __late_set_fixmap __set_fixmap
114#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
115
116extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
117
118#include <asm-generic/fixmap.h>
119
120#endif /* !__ASSEMBLER__ */
121#endif /* _ASM_ARM64_FIXMAP_H */