1 /* 2 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_HIGHMEM_H_ 28 #define _LINUX_HIGHMEM_H_ 29 30 #include <machine/vmparam.h> 31 32 #include <linux/kernel.h> 33 #include <linux/bug.h> 34 #include <linux/mm.h> 35 #include <linux/uaccess.h> 36 #include <linux/hardirq.h> 37 38 #include <asm/cacheflush.h> 39 40 static inline struct page * 41 kmap_to_page(void *addr) 42 { 43 if (addr == NULL) 44 return NULL; 45 46 return (struct page *)PHYS_TO_VM_PAGE(vtophys(addr)); 47 } 48 49 static inline void *kmap(struct page *pg) 50 { 51 return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS( (struct vm_page *)pg )); 52 } 53 54 static inline void kunmap(struct page *pg) 55 { 56 /* Nothing to do on systems with a direct memory map */ 57 } 58 59 static inline void *kmap_atomic(struct page *pg) 60 { 61 return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS( (struct vm_page *)pg )); 62 } 63 64 static inline void * 65 kmap_atomic_prot(struct page *pg, pgprot_t prot) 66 { 67 return kmap_atomic(pg); 68 } 69 70 static inline void kunmap_atomic(void *vaddr) 71 { 72 /* Nothing to do on systems with a direct memory map */ 73 } 74 75 #endif /* _LINUX_HIGHMEM_H_ */ 76