1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_FIXMAP_H
3 #define _ASM_FIXMAP_H
4
5 #define FIXADDR_START 0xffc00000UL
6 #define FIXADDR_END 0xfff00000UL
7 #define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
8
9 #include <linux/pgtable.h>
10 #include <asm/kmap_types.h>
11
12 enum fixed_addresses {
13 FIX_EARLYCON_MEM_BASE,
14 __end_of_permanent_fixed_addresses,
15
16 FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses,
17 FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
18
19 /* Support writing RO kernel text via kprobes, jump labels, etc. */
20 FIX_TEXT_POKE0,
21 FIX_TEXT_POKE1,
22
23 __end_of_fixmap_region,
24
25 /*
26 * Share the kmap() region with early_ioremap(): this is guaranteed
27 * not to clash since early_ioremap() is only available before
28 * paging_init(), and kmap() only after.
29 */
30 #define NR_FIX_BTMAPS 32
31 #define FIX_BTMAPS_SLOTS 7
32 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
33
34 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
35 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
36 __end_of_early_ioremap_region
37 };
38
39 static const enum fixed_addresses __end_of_fixed_addresses =
40 __end_of_fixmap_region > __end_of_early_ioremap_region ?
41 __end_of_fixmap_region : __end_of_early_ioremap_region;
42
43 #define FIXMAP_PAGE_COMMON (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY)
44
45 #define FIXMAP_PAGE_NORMAL (pgprot_kernel | L_PTE_XN)
46 #define FIXMAP_PAGE_RO (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY)
47
48 /* Used by set_fixmap_(io|nocache), both meant for mapping a device */
49 #define FIXMAP_PAGE_IO (FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED | L_PTE_SHARED)
50 #define FIXMAP_PAGE_NOCACHE FIXMAP_PAGE_IO
51
52 #define __early_set_fixmap __set_fixmap
53
54 #ifdef CONFIG_MMU
55
56 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
57 void __init early_fixmap_init(void);
58
59 #include <asm-generic/fixmap.h>
60
61 #else
62
early_fixmap_init(void)63 static inline void early_fixmap_init(void) { }
64
65 #endif
66 #endif
67
