1 /* SPDX-License-Identifier: GPL-2.0 */
14 #include "highmem-internal.h"
17  * kmap - Map a page for long term usage
40  * kunmap - Unmap the virtual address mapped by kmap()
49  * kmap_to_page - Get the page for a kmap'ed address
57  * kmap_flush_unused - Flush all unused kmap mappings in order to
63  * kmap_local_page - Map a page for temporary usage
99  * kmap_local_folio - Map a page in this folio for temporary usage
101  * @offset: The byte offset within the folio which identifies the page.
136  * kmap_atomic - Atomically map a page for temporary usage - Deprecated!
213 …* alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller kn…
282 		memset(kaddr + start1, 0, end1 - start1);  in zero_user_segments()
285 		memset(kaddr + start2, 0, end2 - start2);  in zero_user_segments()
340 			       size_t len)  in memcpy_page()  argument
345 	VM_BUG_ON(dst_off + len > PAGE_SIZE || src_off + len > PAGE_SIZE);  in memcpy_page()
346 	memcpy(dst + dst_off, src + src_off, len);  in memcpy_page()
352 			       size_t len)  in memset_page()  argument
356 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memset_page()
357 	memset(addr + offset, val, len);  in memset_page()
362 				    size_t offset, size_t len)  in memcpy_from_page()  argument
366 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memcpy_from_page()
367 	memcpy(to, from + offset, len);  in memcpy_from_page()
372 				  const char *from, size_t len)  in memcpy_to_page()  argument
376 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memcpy_to_page()
377 	memcpy(to + offset, from, len);  in memcpy_to_page()
382 static inline void memzero_page(struct page *page, size_t offset, size_t len)  in memzero_page()  argument
386 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memzero_page()
387 	memset(addr + offset, 0, len);  in memzero_page()
393  * folio_zero_segments() - Zero two byte ranges in a folio.
395  * @start1: The first byte to zero.
396  * @xend1: One more than the last byte in the first range.
397  * @start2: The first byte to zero in the second range.
398  * @xend2: One more than the last byte in the second range.
403 	zero_user_segments(&folio->page, start1, xend1, start2, xend2);  in folio_zero_segments()
407  * folio_zero_segment() - Zero a byte range in a folio.
409  * @start: The first byte to zero.
410  * @xend: One more than the last byte to zero.
415 	zero_user_segments(&folio->page, start, xend, 0, 0);  in folio_zero_segment()
419  * folio_zero_range() - Zero a byte range in a folio.
421  * @start: The first byte to zero.
427 	zero_user_segments(&folio->page, start, start + length, 0, 0);  in folio_zero_range()