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/* Pagemap manipulation for pager library
Copyright (C) 1994 Free Software Foundation
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, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Grow the pagemap as necessary to deal with address OFF */
void
pagemap_resize (struct pager *p,
int off)
{
void *newaddr;
int newsize;
if (p->pagemapsize && !p->pagemap)
panic ("pagemap failure");
off /= __vm_page_size;
if (p->pagemapsize >= off)
return;
newsize = round_page (off);
vm_allocate (mach_task_self (), (u_int *)&newaddr, newsize, 1);
bcopy (p->pagemap, newaddr, p->pagemapsize);
vm_deallocate (mach_task_self (), (u_int)p->pagemap, p->pagemapsize);
p->pagemap = newaddr;
p->pagemapsize = newsize;
}
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