arch/sparc64/mm/modutil.c

   1 /*  $Id: modutil.c,v 1.4 1998/07/26 06:29:08 davem Exp $
   2  *  arch/sparc64/mm/modutil.c
   3  *
   4  *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  *  Based upon code written by Linus Torvalds and others.
   6  */
   7
   8 #include <linux/malloc.h>
   9 #include <linux/vmalloc.h>
  10
  11 #include <asm/uaccess.h>
  12 #include <asm/system.h>
  13 #include <asm/vaddrs.h>
  14
  15 static struct vm_struct * modvmlist = NULL;
  16
  17 void module_unmap (void * addr)
  18 {
  19         struct vm_struct **p, *tmp;
  20
  21         if (!addr)
  22                 return;
  23         if ((PAGE_SIZE-1) & (unsigned long) addr) {
  24                 printk("Trying to unmap module with bad address (%p)\n", addr);
  25                 return;
  26         }
  27         for (p = &modvmlist ; (tmp = *p) ; p = &tmp->next) {
  28                 if (tmp->addr == addr) {
  29                         *p = tmp->next;
  30                         vmfree_area_pages(VMALLOC_VMADDR(tmp->addr), tmp->size);
  31                         kfree(tmp);
  32                         return;
  33                 }
  34         }
  35         printk("Trying to unmap nonexistent module vm area (%p)\n", addr);
  36 }
  37
  38 void * module_map (unsigned long size)
  39 {
  40         void * addr;
  41         struct vm_struct **p, *tmp, *area;
  42
  43         size = PAGE_ALIGN(size);
  44         if (!size || size > MODULES_LEN) return NULL;
  45
  46         addr = (void *) MODULES_VADDR;
  47         for (p = &modvmlist; (tmp = *p) ; p = &tmp->next) {
  48                 if (size + (unsigned long) addr < (unsigned long) tmp->addr)
  49                         break;
  50                 addr = (void *) (tmp->size + (unsigned long) tmp->addr);
  51         }
  52         if ((unsigned long) addr + size >= MODULES_END) return NULL;
  53
  54         area = (struct vm_struct *) kmalloc(sizeof(*area), GFP_KERNEL);
  55         if (!area) return NULL;
  56         area->size = size + PAGE_SIZE;
  57         area->addr = addr;
  58         area->next = *p;
  59         *p = area;
  60
  61         if (vmalloc_area_pages(VMALLOC_VMADDR(addr), size)) {
  62                 vfree(addr);
  63                 return NULL;
  64         }
  65         return addr;
  66 }