patch-2.4.19 linux-2.4.19/arch/ppc64/mm/imalloc.c

• Lines: 72
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/ppc64/mm/imalloc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/ppc64/mm/imalloc.c linux-2.4.19/arch/ppc64/mm/imalloc.c
@@ -0,0 +1,71 @@
+/*
+ * c 2001 PPC 64 Team, IBM Corp
+ * 
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/spinlock.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+
+rwlock_t imlist_lock = RW_LOCK_UNLOCKED;
+struct vm_struct * imlist = NULL;
+
+struct vm_struct *get_im_area(unsigned long size)
+{
+	unsigned long addr;
+	struct vm_struct **p, *tmp, *area;
+  
+	area = (struct vm_struct *) kmalloc(sizeof(*area), GFP_KERNEL);
+	if (!area)
+		return NULL;
+	addr = IMALLOC_START;
+	write_lock(&imlist_lock);
+	for (p = &imlist; (tmp = *p) ; p = &tmp->next) {
+		if (size + addr < (unsigned long) tmp->addr)
+			break;
+		addr = tmp->size + (unsigned long) tmp->addr;
+		if (addr > IMALLOC_END-size) {
+			write_unlock(&imlist_lock);
+			kfree(area);
+			return NULL;
+		}
+	}
+	area->flags = 0;
+	area->addr = (void *)addr;
+	area->size = size;
+	area->next = *p;
+	*p = area;
+	write_unlock(&imlist_lock);
+	return area;
+}
+
+void ifree(void * addr)
+{
+	struct vm_struct **p, *tmp;
+  
+	if (!addr)
+		return;
+	if ((PAGE_SIZE-1) & (unsigned long) addr) {
+		printk(KERN_ERR "Trying to ifree() bad address (%p)\n", addr);
+		return;
+	}
+	write_lock(&imlist_lock);
+	for (p = &imlist ; (tmp = *p) ; p = &tmp->next) {
+		if (tmp->addr == addr) {
+			*p = tmp->next;
+			kfree(tmp);
+			write_unlock(&imlist_lock);
+			return;
+		}
+	}
+	write_unlock(&imlist_lock);
+	printk(KERN_ERR "Trying to ifree() nonexistent area (%p)\n", addr);
+}
+