1 /* SPDX-License-Identifier: GPL-2.0 */
5 #define FIXADDR_START 0xffc80000UL
6 #define FIXADDR_END 0xfff00000UL
7 #define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
9 #include <linux/pgtable.h>
10 #include <asm/kmap_size.h>
12 enum fixed_addresses
{
13 FIX_EARLYCON_MEM_BASE
,
14 __end_of_permanent_fixed_addresses
,
16 FIX_KMAP_BEGIN
= __end_of_permanent_fixed_addresses
,
17 FIX_KMAP_END
= FIX_KMAP_BEGIN
+ (KM_MAX_IDX
* NR_CPUS
) - 1,
19 /* Support writing RO kernel text via kprobes, jump labels, etc. */
23 __end_of_fixmap_region
,
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.
30 #define NR_FIX_BTMAPS 32
31 #define FIX_BTMAPS_SLOTS 7
32 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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
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
;
43 #define FIXMAP_PAGE_COMMON (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY)
45 #define FIXMAP_PAGE_NORMAL (pgprot_kernel | L_PTE_XN)
46 #define FIXMAP_PAGE_RO (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY)
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
52 #define __early_set_fixmap __set_fixmap
56 void __set_fixmap(enum fixed_addresses idx
, phys_addr_t phys
, pgprot_t prot
);
57 void __init
early_fixmap_init(void);
59 #include <asm-generic/fixmap.h>
63 static inline void early_fixmap_init(void) { }