diff -urN -X dontdiff linux/drivers/char/mem.c vwrite/drivers/char/mem.c
--- linux/drivers/char/mem.c	Sat Jun 24 12:44:26 2000
+++ vwrite/drivers/char/mem.c	Fri Aug 11 15:39:40 2000
@@ -288,12 +288,54 @@
 			  size_t count, loff_t *ppos)
 {
 	unsigned long p = *ppos;
+	ssize_t	write = 0;
+	ssize_t virtr = 0;
+	char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
 
-	if (p >= (unsigned long) high_memory)
-		return 0;
-	if (count > (unsigned long) high_memory - p)
-		count = (unsigned long) high_memory - p;
-	return do_write_mem(file, (void*)p, p, buf, count, ppos);
+	if (p < (unsigned long) high_memory) {
+		write = count;
+		if (count > (unsigned long) high_memory - p)
+			write = (unsigned long) high_memory - p;
+
+#if defined(__sparc__) || defined(__mc68000__)
+		/* we don't have page 0 mapped on sparc and m68k.. */
+		if (p < PAGE_SIZE && write > 0) {
+			size_t tmp = PAGE_SIZE - p;
+			if (tmp > write) tmp = write;
+			buf += tmp;
+			p += tmp;
+			write -= tmp;
+			count -= tmp;
+		}
+#endif
+		if (copy_from_user((char *)p, buf, write))
+			return -EFAULT;
+		p += write;
+		buf += write;
+		count -= write;
+	}
+
+	kbuf = (char *)__get_free_page(GFP_KERNEL);
+	if (!kbuf)
+		return -ENOMEM;
+	while (count > 0) {
+		int len = count;
+
+		if (len > PAGE_SIZE)
+			len = PAGE_SIZE;
+		if (len && copy_from_user(kbuf, buf, len)) {
+			free_page((unsigned long)kbuf);
+			return -EFAULT;
+		}
+		len = vwrite(kbuf, (char *)p, len);
+		count -= len;
+		buf += len;
+		virtr += len;
+		p += len;
+	}
+	free_page((unsigned long)kbuf);
+ 	*ppos = p;
+ 	return virtr + write;
 }
 
 #if !defined(__mc68000__)
diff -urN -X dontdiff linux/include/linux/vmalloc.h vwrite/include/linux/vmalloc.h
--- linux/include/linux/vmalloc.h	Tue Jul 11 19:26:51 2000
+++ vwrite/include/linux/vmalloc.h	Fri Aug 11 15:44:58 2000
@@ -22,6 +22,7 @@
 extern void vfree(void * addr);
 extern void * __vmalloc (unsigned long size, int gfp_mask, pgprot_t prot);
 extern long vread(char *buf, char *addr, unsigned long count);
+extern long vwrite(char *buf, char *addr, unsigned long count);
 extern void vmfree_area_pages(unsigned long address, unsigned long size);
 extern int vmalloc_area_pages(unsigned long address, unsigned long size,
                               int gfp_mask, pgprot_t prot);
diff -urN -X dontdiff linux/mm/vmalloc.c vwrite/mm/vmalloc.c
--- linux/mm/vmalloc.c	Thu Aug 10 06:51:12 2000
+++ vwrite/mm/vmalloc.c	Fri Aug 11 15:39:40 2000
@@ -4,6 +4,7 @@
  *  Copyright (C) 1993  Linus Torvalds
  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
  *  SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <tigran@veritas.com>, May 2000
+ *  vwrite for write_kmem, Amit S. Kale <akale@veritas.com>, May 2000
  */
 
 #include <linux/malloc.h>
@@ -263,6 +264,43 @@
 			if (count == 0)
 				goto finished;
 			*buf = *addr;
+			buf++;
+			addr++;
+			count--;
+		} while (--n > 0);
+	}
+finished:
+	read_unlock(&vmlist_lock);
+	return buf - buf_start;
+}
+
+long vwrite(char *buf, char *addr, unsigned long count)
+{
+	struct vm_struct *tmp;
+	char *vaddr, *buf_start = buf;
+	unsigned long n;
+
+	/* Don't allow overflow */
+	if ((unsigned long) addr + count < count)
+		count = -(unsigned long) addr;
+
+	read_lock(&vmlist_lock);
+	for (tmp = vmlist; tmp; tmp = tmp->next) {
+		vaddr = (char *) tmp->addr;
+		if (addr >= vaddr + tmp->size - PAGE_SIZE)
+			continue;
+		while (addr < vaddr) {
+			if (count == 0)
+				goto finished;
+			buf++;
+			addr++;
+			count--;
+		}
+		n = vaddr + tmp->size - PAGE_SIZE - addr;
+		do {
+			if (count == 0)
+				goto finished;
+			*addr = *buf;
 			buf++;
 			addr++;
 			count--;