shared/start/pgtbl_activate.c

0001 #include <rtems.h>
0002 #include <libcpu/pte121.h>
0003 #include <libcpu/bat.h>
0004
0005 /* Default activation of the page tables. This is a weak
0006  * alias, so applications may easily override this
0007  * default activation procedure.
0008  */
0009
0010 /*
0011  * Authorship
0012  * ----------
0013  * This software was created by
0014  *     Till Straumann <strauman@slac.stanford.edu>, 4/2002,
0015  *     Stanford Linear Accelerator Center, Stanford University.
0016  *
0017  * Acknowledgement of sponsorship
0018  * ------------------------------
0019  * This software was produced by
0020  *     the Stanford Linear Accelerator Center, Stanford University,
0021  *     under Contract DE-AC03-76SFO0515 with the Department of Energy.
0022  *
0023  * Government disclaimer of liability
0024  * ----------------------------------
0025  * Neither the United States nor the United States Department of Energy,
0026  * nor any of their employees, makes any warranty, express or implied, or
0027  * assumes any legal liability or responsibility for the accuracy,
0028  * completeness, or usefulness of any data, apparatus, product, or process
0029  * disclosed, or represents that its use would not infringe privately owned
0030  * rights.
0031  *
0032  * Stanford disclaimer of liability
0033  * --------------------------------
0034  * Stanford University makes no representations or warranties, express or
0035  * implied, nor assumes any liability for the use of this software.
0036  *
0037  * Stanford disclaimer of copyright
0038  * --------------------------------
0039  * Stanford University, owner of the copyright, hereby disclaims its
0040  * copyright and all other rights in this software.  Hence, anyone may
0041  * freely use it for any purpose without restriction.
0042  *
0043  * Maintenance of notices
0044  * ----------------------
0045  * In the interest of clarity regarding the origin and status of this
0046  * SLAC software, this and all the preceding Stanford University notices
0047  * are to remain affixed to any copy or derivative of this software made
0048  * or distributed by the recipient and are to be affixed to any copy of
0049  * software made or distributed by the recipient that contains a copy or
0050  * derivative of this software.
0051  *
0052  * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03
0053  */
0054
0055 void __BSP_default_pgtbl_activate(Triv121PgTbl pt);
0056 void
0057 BSP_pgtbl_activate(Triv121PgTbl)
0058   __attribute__ (( weak, alias("__BSP_default_pgtbl_activate") ));
0059
0060 void
0061 __BSP_default_pgtbl_activate(Triv121PgTbl pt)
0062 {
0063     if (!pt) return;
0064
0065     /* switch the text/ro sements to RO only after
0066      * initializing the interrupts because the irq_mng
0067      * installs some code...
0068      *
0069      * activate the page table; it is still masked by the
0070      * DBAT0, however
0071      */
0072     triv121PgTblActivate(pt);
0073
0074     /* finally, switch off DBAT0 */
0075     setdbat(0,0,0,0,0);
0076     /* At this point, DBAT0 is available for other use... */
0077 }