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--- mywiki:linux:page_allocation [2016/05/18 10:38] – created shaoguoh
+++ mywiki:linux:page_allocation [2019/09/15 18:55] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 | Reference |  |
-Linux Page Allocation
+====== Address Conversion ======
+===== page to Virtual address =====
+<file>
+struct page *page;
+unsigned char *p;
+p = page_address(page);
+</file>
+Other APIs:
+  * kmap_atomic
+  * __kunmap_atomic
+====== Linux Page Allocation ======
 Allocate pages
@@ Line 8: / Line 20: @@
    struct page *page;
    page = alloc_pages(gfp, order);
+</file>
+Allocate one page
+<file>
+   struct page *page, *head;
+   char *data="aljalf";
+   /*allocate a page */
+   page = alloc_page(gfp_mask);
+   if (page)
+      memcpy(page_address(page),  data, strlen(data)+1 );
+   /*free a page*/
+   put_page(page );
 </file>