patch-2.3.16 linux/include/linux/bigmem.h

• Lines: 49
• Date: Tue Aug 31 16:12:02 1999
• Orig file: v2.3.15/linux/include/linux/bigmem.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/include/linux/bigmem.h linux/include/linux/bigmem.h
@@ -0,0 +1,48 @@
+#ifndef _LINUX_BIGMEM_H
+#define _LINUX_BIGMEM_H
+
+#include <linux/config.h>
+
+#ifdef CONFIG_BIGMEM
+
+#include <asm/bigmem.h>
+
+/* declarations for linux/mm/bigmem.c */
+extern unsigned long bigmem_mapnr;
+extern int nr_free_bigpages;
+
+extern struct page * prepare_bigmem_swapout(struct page *);
+extern struct page * replace_with_bigmem(struct page *);
+
+#else /* CONFIG_BIGMEM */
+
+#define prepare_bigmem_swapout(page) page
+#define replace_with_bigmem(page) page
+#define kmap(kaddr, type) kaddr
+#define kunmap(vaddr, type) do { } while (0)
+#define nr_free_bigpages 0
+
+#endif /* CONFIG_BIGMEM */
+
+/* when CONFIG_BIGMEM is not set these will be plain clear/copy_page */
+extern inline void clear_bigpage(unsigned long kaddr)
+{
+	unsigned long vaddr;
+
+	vaddr = kmap(kaddr, KM_WRITE);
+	clear_page(vaddr);
+	kunmap(vaddr, KM_WRITE);
+}
+
+extern inline void copy_bigpage(unsigned long to, unsigned long from)
+{
+	unsigned long vfrom, vto;
+
+	vfrom = kmap(from, KM_READ);
+	vto = kmap(to, KM_WRITE);
+	copy_page(vto, vfrom);
+	kunmap(vfrom, KM_READ);
+	kunmap(vto, KM_WRITE);
+}
+
+#endif /* _LINUX_BIGMEM_H */