1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_FIXMAP_H
 3#define _ASM_FIXMAP_H
 4
 5#define FIXADDR_START		0xffc80000UL
 6#define FIXADDR_END		0xfff00000UL
 7#define FIXADDR_TOP		(FIXADDR_END - PAGE_SIZE)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 8
 9#include <linux/pgtable.h>
10#include <asm/kmap_size.h>
11
12enum 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_MAX_IDX * 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
39static 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
56void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
57void __init early_fixmap_init(void);
58
59#include <asm-generic/fixmap.h>
60
61#else
62
63static inline void early_fixmap_init(void) { }
64
65#endif
66#endif

 
 1#ifndef _ASM_FIXMAP_H
 2#define _ASM_FIXMAP_H
 3
 4/*
 5 * Nothing too fancy for now.
 6 *
 7 * On ARM we already have well known fixed virtual addresses imposed by
 8 * the architecture such as the vector page which is located at 0xffff0000,
 9 * therefore a second level page table is already allocated covering
10 * 0xfff00000 upwards.
11 *
12 * The cache flushing code in proc-xscale.S uses the virtual area between
13 * 0xfffe0000 and 0xfffeffff.
14 */
15
16#define FIXADDR_START		0xfff00000UL
17#define FIXADDR_TOP		0xfffe0000UL
18#define FIXADDR_SIZE		(FIXADDR_TOP - FIXADDR_START)
19
20#define FIX_KMAP_BEGIN		0
21#define FIX_KMAP_END		(FIXADDR_SIZE >> PAGE_SHIFT)
22
23#define __fix_to_virt(x)	(FIXADDR_START + ((x) << PAGE_SHIFT))
24#define __virt_to_fix(x)	(((x) - FIXADDR_START) >> PAGE_SHIFT)
25
26extern void __this_fixmap_does_not_exist(void);
27
28static inline unsigned long fix_to_virt(const unsigned int idx)
29{
30	if (idx >= FIX_KMAP_END)
31		__this_fixmap_does_not_exist();
32	return __fix_to_virt(idx);
33}
34
35static inline unsigned int virt_to_fix(const unsigned long vaddr)
36{
37	BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
38	return __virt_to_fix(vaddr);
39}
40
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
41#endif