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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
5f0fbf9e NP |
2 | #ifndef _ASM_FIXMAP_H |
3 | #define _ASM_FIXMAP_H | |
4 | ||
a05e54c1 | 5 | #define FIXADDR_START 0xffc00000UL |
836a2418 | 6 | #define FIXADDR_END 0xfff00000UL |
b615bbbf | 7 | #define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE) |
5f0fbf9e | 8 | |
b615bbbf | 9 | #include <asm/kmap_types.h> |
a5f4c561 | 10 | #include <asm/pgtable.h> |
5f0fbf9e | 11 | |
b615bbbf | 12 | enum fixed_addresses { |
a5f4c561 SA |
13 | FIX_EARLYCON_MEM_BASE, |
14 | __end_of_permanent_fixed_addresses, | |
15 | ||
16 | FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses, | |
b615bbbf | 17 | FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, |
5f0fbf9e | 18 | |
ab0615e2 RV |
19 | /* Support writing RO kernel text via kprobes, jump labels, etc. */ |
20 | FIX_TEXT_POKE0, | |
21 | FIX_TEXT_POKE1, | |
22 | ||
2937367b AB |
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 | |
b615bbbf | 37 | }; |
5f0fbf9e | 38 | |
2937367b AB |
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 | ||
a5f4c561 SA |
43 | #define FIXMAP_PAGE_COMMON (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY) |
44 | ||
b089c31c | 45 | #define FIXMAP_PAGE_NORMAL (pgprot_kernel | L_PTE_XN) |
2937367b | 46 | #define FIXMAP_PAGE_RO (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY) |
a5f4c561 SA |
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 | ||
2937367b AB |
52 | #define __early_set_fixmap __set_fixmap |
53 | ||
54 | #ifdef CONFIG_MMU | |
55 | ||
99b4ac9a | 56 | void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); |
a5f4c561 | 57 | void __init early_fixmap_init(void); |
99b4ac9a | 58 | |
b615bbbf | 59 | #include <asm-generic/fixmap.h> |
5f0fbf9e | 60 | |
2937367b AB |
61 | #else |
62 | ||
63 | static inline void early_fixmap_init(void) { } | |
64 | ||
65 | #endif | |
5f0fbf9e | 66 | #endif |