| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| 3 | |
| 4 | #ifndef __ASM_CSKY_HIGHMEM_H |
| 5 | #define __ASM_CSKY_HIGHMEM_H |
| 6 | |
| 7 | #ifdef __KERNEL__ |
| 8 | |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/uaccess.h> |
| 12 | #include <asm/kmap_types.h> |
| 13 | #include <asm/cache.h> |
| 14 | |
| 15 | /* undef for production */ |
| 16 | #define HIGHMEM_DEBUG 1 |
| 17 | |
| 18 | /* declarations for highmem.c */ |
| 19 | extern unsigned long highstart_pfn, highend_pfn; |
| 20 | |
| 21 | extern pte_t *pkmap_page_table; |
| 22 | |
| 23 | /* |
| 24 | * Right now we initialize only a single pte table. It can be extended |
| 25 | * easily, subsequent pte tables have to be allocated in one physical |
| 26 | * chunk of RAM. |
| 27 | */ |
| 28 | #define LAST_PKMAP 1024 |
| 29 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) |
| 30 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) |
| 31 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) |
| 32 | |
| 33 | extern void *kmap_high(struct page *page); |
| 34 | extern void kunmap_high(struct page *page); |
| 35 | |
| 36 | extern void *kmap(struct page *page); |
| 37 | extern void kunmap(struct page *page); |
| 38 | extern void *kmap_atomic(struct page *page); |
| 39 | extern void __kunmap_atomic(void *kvaddr); |
| 40 | extern void *kmap_atomic_pfn(unsigned long pfn); |
| 41 | extern struct page *kmap_atomic_to_page(void *ptr); |
| 42 | |
| 43 | #define flush_cache_kmaps() do {} while (0) |
| 44 | |
| 45 | extern void kmap_init(void); |
| 46 | |
| 47 | #define kmap_prot PAGE_KERNEL |
| 48 | |
| 49 | #endif /* __KERNEL__ */ |
| 50 | |
| 51 | #endif /* __ASM_CSKY_HIGHMEM_H */ |