1 /* 2 * include/asm-xtensa/highmem.h 3 * 4 * This file is subject to the terms and conditions of the GNU General 5 * Public License. See the file "COPYING" in the main directory of 6 * this archive for more details. 7 * 8 * Copyright (C) 2003 - 2005 Tensilica Inc. 9 * Copyright (C) 2014 Cadence Design Systems Inc. 10 */ 11 12 #ifndef _XTENSA_HIGHMEM_H 13 #define _XTENSA_HIGHMEM_H 14 15 #include <asm/cacheflush.h> 16 #include <asm/fixmap.h> 17 #include <asm/kmap_types.h> 18 #include <asm/pgtable.h> 19 20 #define PKMAP_BASE (FIXADDR_START - PMD_SIZE) 21 #define LAST_PKMAP PTRS_PER_PTE 22 #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 23 #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) 24 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 25 26 #define kmap_prot PAGE_KERNEL 27 28 extern pte_t *pkmap_page_table; 29 30 void *kmap_high(struct page *page); 31 void kunmap_high(struct page *page); 32 33 static inline void *kmap(struct page *page) 34 { 35 BUG_ON(in_interrupt()); 36 if (!PageHighMem(page)) 37 return page_address(page); 38 return kmap_high(page); 39 } 40 41 static inline void kunmap(struct page *page) 42 { 43 BUG_ON(in_interrupt()); 44 if (!PageHighMem(page)) 45 return; 46 kunmap_high(page); 47 } 48 49 static inline void flush_cache_kmaps(void) 50 { 51 flush_cache_all(); 52 } 53 54 void *kmap_atomic(struct page *page); 55 void __kunmap_atomic(void *kvaddr); 56 57 void kmap_init(void); 58 59 #endif 60