mvme5500/start/pgtbl_activate.c

0001 /*
0002  * Default activation of the page tables. This is a weak
0003  * alias, so applications may easily override this
0004  * default activation procedure.
0005  */
0006
0007 /* Author: Till Straumann, <strauman@slac.stanford.edu>, 4/2002
0008  * Kate Feng <feng1@bnl.gov> ported it to MVME5500, 4/2004
0009  */
0010
0011 #include <rtems.h>
0012 #include <libcpu/pte121.h>
0013 #include <libcpu/bat.h>
0014
0015 static void
0016 __BSP_default_pgtbl_activate(Triv121PgTbl pt)
0017 {
0018   if (!pt)
0019     return;
0020
0021   /* switch the text/ro sements to RO only after
0022    * initializing the interrupts because the irq_mng
0023    * installs some code...
0024    *
0025    * activate the page table; it is still masked by the
0026    * DBAT0, however
0027    */
0028   triv121PgTblActivate(pt);
0029
0030   /* finally, switch off DBAT0 & DBAT1 */
0031   setdbat(0,0,0,0,0);
0032   setdbat(1,0,0,0,0);  /* <skf> */
0033   /* At this point, DBAT0 is available for other use... */
0034 }
0035
0036 void BSP_pgtbl_activate(Triv121PgTbl)
0037   __attribute__ (( weak, alias("__BSP_default_pgtbl_activate") ));