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Diffstat (limited to 'arch/csky/include/asm/highmem.h')
| -rw-r--r-- | arch/csky/include/asm/highmem.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h new file mode 100644 index 000000000000..a345a2f2c22e --- /dev/null +++ b/arch/csky/include/asm/highmem.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_HIGHMEM_H +#define __ASM_CSKY_HIGHMEM_H + +#ifdef __KERNEL__ + +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/uaccess.h> +#include <asm/kmap_types.h> +#include <asm/cache.h> + +/* undef for production */ +#define HIGHMEM_DEBUG 1 + +/* declarations for highmem.c */ +extern unsigned long highstart_pfn, highend_pfn; + +extern pte_t *pkmap_page_table; + +/* + * Right now we initialize only a single pte table. It can be extended + * easily, subsequent pte tables have to be allocated in one physical + * chunk of RAM. + */ +#define LAST_PKMAP 1024 +#define LAST_PKMAP_MASK (LAST_PKMAP-1) +#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) +#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) + +extern void *kmap_high(struct page *page); +extern void kunmap_high(struct page *page); + +extern void *kmap(struct page *page); +extern void kunmap(struct page *page); +extern void *kmap_atomic(struct page *page); +extern void __kunmap_atomic(void *kvaddr); +extern void *kmap_atomic_pfn(unsigned long pfn); +extern struct page *kmap_atomic_to_page(void *ptr); + +#define flush_cache_kmaps() do {} while (0) + +extern void kmap_init(void); + +#define kmap_prot PAGE_KERNEL + +#endif /* __KERNEL__ */ + +#endif /* __ASM_CSKY_HIGHMEM_H */ |