// mem/pagetable.cc -- Generic page table implementation
+//
// Most architectures should be able to use this as is, though
// architectures with weird paging hardware can provide their own implementation.
//
//
// This software is copyright (c) 2006 Scott Wood <scott@buserror.net>.
//
-// Permission is hereby granted, free of charge, to any person obtaining a copy of
-// this software and associated documentation files (the "Software"), to deal with
-// the Software without restriction, including without limitation the rights to
-// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-// of the Software, and to permit persons to whom the Software is furnished to do
-// so, subject to the following conditions:
-//
-// * Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimers.
-//
-// * Redistributions in binary form must reproduce the above copyright notice,
-// this list of conditions and the following disclaimers in the
-// documentation and/or other materials provided with the distribution.
-//
-// * The names of the Software's authors and/or contributors
-// may not be used to endorse or promote products derived from
-// this Software without specific prior written permission.
+// This software is provided 'as-is', without any express or implied warranty.
+// In no event will the authors or contributors be held liable for any damages
+// arising from the use of this software.
//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
-// SOFTWARE.
+// Permission is hereby granted to everyone, free of charge, to use, copy,
+// modify, prepare derivative works of, publish, distribute, perform,
+// sublicense, and/or sell copies of the Software, provided that the above
+// copyright notice and disclaimer of warranty be included in all copies or
+// substantial portions of this software.
#include <kern/mem.h>
#include <kern/pagealloc.h>
-#include <kern/pagetable.h>
+#include <kern/generic-pagetable.h>
#include <kern/generic-pte.h>
#include <lowlevel/atomic.h>
#include <util/misc.h>
PTE newpte = PTE::addr_to_pte(region.offset) | flags;
PTE oldpte = newpte.xchg_pte(ptable, i);
- retain_if_phys(region.offset);
+ if (!newpte.addronly_pte())
+ retain_if_phys(region.offset);
if (oldpte) {
// vaddr is only for process aspaces, so don't worry
((i - start) << PTE::page_shift);
kill_pte(vaddr, oldpte.pte_to_addr(),
- oldpte.dirty_pte(), oldpte.valid_pte());
+ oldpte.dirty_pte(), oldpte.valid_pte(),
+ oldpte.addronly_pte());
} else {
page->retain();
}
((i - start) << PTE::page_shift);
kill_pte(vaddr, oldpte.pte_to_addr(),
- oldpte.dirty_pte(), oldpte.valid_pte());
+ oldpte.dirty_pte(), oldpte.valid_pte(),
+ oldpte.addronly_pte());
}
assert(page->inuse.refcount > 1);