1 /* $OpenBSD: highmem.h,v 1.1 2019/04/14 10:14:53 jsg Exp $ */ 2 /* 3 * Copyright (c) 2013, 2014, 2015 Mark Kettenis 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #ifndef _LINUX_HIGHMEM_H 19 #define _LINUX_HIGHMEM_H 20 21 #include <uvm/uvm_extern.h> 22 #include <linux/uaccess.h> 23 24 void *kmap(struct vm_page *); 25 void kunmap(void *addr); 26 27 #define kmap_to_page(ptr) (ptr) 28 29 #if defined(__i386__) || defined(__amd64__) 30 31 static inline void * 32 kmap_atomic(struct vm_page *pg) 33 { 34 vaddr_t va; 35 36 #if defined (__HAVE_PMAP_DIRECT) 37 va = pmap_map_direct(pg); 38 #else 39 extern vaddr_t pmap_tmpmap_pa(paddr_t); 40 va = pmap_tmpmap_pa(VM_PAGE_TO_PHYS(pg)); 41 #endif 42 return (void *)va; 43 } 44 45 static inline void 46 kunmap_atomic(void *addr) 47 { 48 #if defined (__HAVE_PMAP_DIRECT) 49 pmap_unmap_direct((vaddr_t)addr); 50 #else 51 extern void pmap_tmpunmap_pa(void); 52 pmap_tmpunmap_pa(); 53 #endif 54 } 55 56 #endif /* defined(__i386__) || defined(__amd64__) */ 57 58 #endif 59