52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_HIGHMEM_H
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#define __ASM_CSKY_HIGHMEM_H
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#ifdef __KERNEL__
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/uaccess.h>
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#include <asm/kmap_types.h>
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#include <asm/cache.h>
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/* undef for production */
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#define HIGHMEM_DEBUG 1
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/* declarations for highmem.c */
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extern unsigned long highstart_pfn, highend_pfn;
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extern pte_t *pkmap_page_table;
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/*
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* Right now we initialize only a single pte table. It can be extended
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* easily, subsequent pte tables have to be allocated in one physical
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* chunk of RAM.
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*/
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#define LAST_PKMAP 1024
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#define LAST_PKMAP_MASK (LAST_PKMAP-1)
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#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
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#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
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extern void *kmap_high(struct page *page);
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extern void kunmap_high(struct page *page);
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extern void *kmap(struct page *page);
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extern void kunmap(struct page *page);
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extern void *kmap_atomic(struct page *page);
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extern void __kunmap_atomic(void *kvaddr);
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extern void *kmap_atomic_pfn(unsigned long pfn);
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extern struct page *kmap_atomic_to_page(void *ptr);
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#define flush_cache_kmaps() do {} while (0)
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extern void kmap_init(void);
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#define kmap_prot PAGE_KERNEL
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#endif /* __KERNEL__ */
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#endif /* __ASM_CSKY_HIGHMEM_H */
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