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 37 extern void *kmap(struct page *page); 38 extern void *kmap_high(struct page *page); 39 extern void *kmap_atomic(struct page *page); 40 extern void __kunmap_atomic(void *kvaddr); 41 extern void kunmap_high(struct page *page); 42 43 extern void kmap_init(void); 44 45 static inline void flush_cache_kmaps(void) 46 { 47 flush_cache_all(); 48 } 49 50 static 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 62