1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ASM_FIXMAP_H
3*4882a593Smuzhiyun #define _ASM_FIXMAP_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #define FIXADDR_START 0xffc80000UL
6*4882a593Smuzhiyun #define FIXADDR_END 0xfff00000UL
7*4882a593Smuzhiyun #define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/pgtable.h>
10*4882a593Smuzhiyun #include <asm/kmap_types.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun enum fixed_addresses {
13*4882a593Smuzhiyun FIX_EARLYCON_MEM_BASE,
14*4882a593Smuzhiyun __end_of_permanent_fixed_addresses,
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses,
17*4882a593Smuzhiyun FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /* Support writing RO kernel text via kprobes, jump labels, etc. */
20*4882a593Smuzhiyun FIX_TEXT_POKE0,
21*4882a593Smuzhiyun FIX_TEXT_POKE1,
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun __end_of_fixmap_region,
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /*
26*4882a593Smuzhiyun * Share the kmap() region with early_ioremap(): this is guaranteed
27*4882a593Smuzhiyun * not to clash since early_ioremap() is only available before
28*4882a593Smuzhiyun * paging_init(), and kmap() only after.
29*4882a593Smuzhiyun */
30*4882a593Smuzhiyun #define NR_FIX_BTMAPS 32
31*4882a593Smuzhiyun #define FIX_BTMAPS_SLOTS 7
32*4882a593Smuzhiyun #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
35*4882a593Smuzhiyun FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
36*4882a593Smuzhiyun __end_of_early_ioremap_region
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static const enum fixed_addresses __end_of_fixed_addresses =
40*4882a593Smuzhiyun __end_of_fixmap_region > __end_of_early_ioremap_region ?
41*4882a593Smuzhiyun __end_of_fixmap_region : __end_of_early_ioremap_region;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun #define FIXMAP_PAGE_COMMON (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY)
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun #define FIXMAP_PAGE_NORMAL (pgprot_kernel | L_PTE_XN)
46*4882a593Smuzhiyun #define FIXMAP_PAGE_RO (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY)
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun /* Used by set_fixmap_(io|nocache), both meant for mapping a device */
49*4882a593Smuzhiyun #define FIXMAP_PAGE_IO (FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED | L_PTE_SHARED)
50*4882a593Smuzhiyun #define FIXMAP_PAGE_NOCACHE FIXMAP_PAGE_IO
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun #define __early_set_fixmap __set_fixmap
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun #ifdef CONFIG_MMU
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
57*4882a593Smuzhiyun void __init early_fixmap_init(void);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun #include <asm-generic/fixmap.h>
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun #else
62*4882a593Smuzhiyun
early_fixmap_init(void)63*4882a593Smuzhiyun static inline void early_fixmap_init(void) { }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun #endif
66*4882a593Smuzhiyun #endif
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