modutil.c
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上传日期:2013-04-10
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- /* $Id: modutil.c,v 1.11 2001/12/05 06:05:35 davem Exp $
- * arch/sparc64/mm/modutil.c
- *
- * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- * Based upon code written by Linus Torvalds and others.
- */
-
- #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;
- }