patch-2.4.20 linux-2.4.20/arch/x86_64/mm/modutil.c

• Lines: 69
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/arch/x86_64/mm/modutil.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/x86_64/mm/modutil.c linux-2.4.20/arch/x86_64/mm/modutil.c
@@ -0,0 +1,68 @@
+/*  arch/x86_64/mm/modutil.c
+ *
+ *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ *  Based upon code written by Linus Torvalds and others.
+ * 
+ *  Blatantly copied from sparc64 for x86-64 by Andi Kleen. 
+ *  Should use direct mapping with 2MB pages. This would need extension
+ *  of the kernel mapping.
+ */
+ 
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+static struct vm_struct * modvmlist = NULL;
+
+void module_unmap (void * addr)
+{
+	struct vm_struct **p, *tmp;
+
+	if (!addr)
+		return;
+	if ((PAGE_SIZE-1) & (unsigned long) addr) {
+		printk("Trying to unmap module with bad address (%p)\n", addr);
+		return;
+	}
+	for (p = &modvmlist ; (tmp = *p) ; p = &tmp->next) {
+		if (tmp->addr == addr) {
+			*p = tmp->next;
+			vmfree_area_pages(VMALLOC_VMADDR(tmp->addr), tmp->size);
+			kfree(tmp);
+			return;
+		}
+	}
+	printk("Trying to unmap nonexistent module vm area (%p)\n", addr);
+}
+
+void * module_map (unsigned long size)
+{
+	void * addr;
+	struct vm_struct **p, *tmp, *area;
+
+	size = PAGE_ALIGN(size);
+	if (!size || size > MODULES_LEN) return NULL;
+		
+	addr = (void *) MODULES_VADDR;
+	for (p = &modvmlist; (tmp = *p) ; p = &tmp->next) {
+		if (size + (unsigned long) addr < (unsigned long) tmp->addr)
+			break;
+		addr = (void *) (tmp->size + (unsigned long) tmp->addr);
+	}
+	if ((unsigned long) addr + size >= MODULES_END) return NULL;
+	
+	area = (struct vm_struct *) kmalloc(sizeof(*area), GFP_KERNEL);
+	if (!area) return NULL;
+	area->size = size + PAGE_SIZE;
+	area->addr = addr;
+	area->next = *p;
+	*p = area;
+
+	if (vmalloc_area_pages(VMALLOC_VMADDR(addr), size, GFP_KERNEL, PAGE_KERNEL)) {
+		module_unmap(addr);
+		return NULL;
+	}
+	return addr;
+}