1/*
 2 * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 *
 8 */
 9
10#ifndef _ASM_HIGHMEM_H
11#define _ASM_HIGHMEM_H
12
13#ifdef CONFIG_HIGHMEM
14
15#include <uapi/asm/page.h>
16#include <asm/kmap_types.h>
 
 
 
17
18/* start after vmalloc area */
19#define FIXMAP_BASE		(PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
20#define FIXMAP_SIZE		PGDIR_SIZE	/* only 1 PGD worth */
21#define KM_TYPE_NR		((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS)
22#define FIXMAP_ADDR(nr)		(FIXMAP_BASE + ((nr) << PAGE_SHIFT))
 
 
 
 
 
 
 
 
 
 
23
24/* start after fixmap area */
25#define PKMAP_BASE		(FIXMAP_BASE + FIXMAP_SIZE)
26#define PKMAP_SIZE		PGDIR_SIZE
27#define LAST_PKMAP		(PKMAP_SIZE >> PAGE_SHIFT)
28#define LAST_PKMAP_MASK		(LAST_PKMAP - 1)
29#define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))
30#define PKMAP_NR(virt)		(((virt) - PKMAP_BASE) >> PAGE_SHIFT)
31
32#define kmap_prot		PAGE_KERNEL
33
34
35#include <asm/cacheflush.h>
36
37extern void *kmap(struct page *page);
38extern void *kmap_high(struct page *page);
39extern void *kmap_atomic(struct page *page);
40extern void __kunmap_atomic(void *kvaddr);
41extern void kunmap_high(struct page *page);
42
43extern void kmap_init(void);
44
 
 
 
45static inline void flush_cache_kmaps(void)
46{
47	flush_cache_all();
48}
49
50static inline void kunmap(struct page *page)
51{
52	BUG_ON(in_interrupt());
53	if (!PageHighMem(page))
54		return;
55	kunmap_high(page);
56}
57
58
59#endif
60
61#endif

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
 
 
 
 
 
 4 */
 5
 6#ifndef _ASM_HIGHMEM_H
 7#define _ASM_HIGHMEM_H
 8
 9#ifdef CONFIG_HIGHMEM
10
11#include <uapi/asm/page.h>
12#include <asm/kmap_size.h>
13
14#define FIXMAP_SIZE		PGDIR_SIZE
15#define PKMAP_SIZE		PGDIR_SIZE
16
17/* start after vmalloc area */
18#define FIXMAP_BASE		(PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
19
20#define FIX_KMAP_SLOTS		(KM_MAX_IDX * NR_CPUS)
21#define FIX_KMAP_BEGIN		(0UL)
22#define FIX_KMAP_END		((FIX_KMAP_BEGIN + FIX_KMAP_SLOTS) - 1)
23
24#define FIXADDR_TOP		(FIXMAP_BASE + (FIX_KMAP_END << PAGE_SHIFT))
25
26/*
27 * This should be converted to the asm-generic version, but of course this
28 * is needlessly different from all other architectures. Sigh - tglx
29 */
30#define __fix_to_virt(x)	(FIXADDR_TOP - ((x) << PAGE_SHIFT))
31#define __virt_to_fix(x)	(((FIXADDR_TOP - ((x) & PAGE_MASK))) >> PAGE_SHIFT)
32
33/* start after fixmap area */
34#define PKMAP_BASE		(FIXMAP_BASE + FIXMAP_SIZE)
 
35#define LAST_PKMAP		(PKMAP_SIZE >> PAGE_SHIFT)
36#define LAST_PKMAP_MASK		(LAST_PKMAP - 1)
37#define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))
38#define PKMAP_NR(virt)		(((virt) - PKMAP_BASE) >> PAGE_SHIFT)
39
 
 
 
40#include <asm/cacheflush.h>
41
 
 
 
 
 
 
42extern void kmap_init(void);
43
44#define arch_kmap_local_post_unmap(vaddr)			\
45	local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE)
46
47static inline void flush_cache_kmaps(void)
48{
49	flush_cache_all();
50}
 
 
 
 
 
 
 
 
 
 
51#endif
52
53#endif