vhpt.c

Go to the documentation of this file.

/*
* Copyright (C) 2006 Jakub Vana
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
*   notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
*   notice, this list of conditions and the following disclaimer in the
*   documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
*   derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch/mm/vhpt.h>
#include <mm/frame.h>
#include <print.h>


static vhpt_entry_t* vhpt_base;

__address vhpt_set_up(void)
{
        vhpt_base=(vhpt_entry_t*) PA2KA(PFN2ADDR(frame_alloc(VHPT_WIDTH-FRAME_WIDTH,FRAME_KA)));
        if(!vhpt_base) panic("Kernel configured with VHPT but no memory for table.");
        vhpt_invalidate_all();
        return (__address) vhpt_base;
}


void vhpt_mapping_insert(__address va, asid_t asid, tlb_entry_t entry)
{
        region_register rr_save, rr;
        index_t vrn;
        rid_t rid;
        __u64 tag;

        vhpt_entry_t *ventry;


        vrn = va >> VRN_SHIFT;
        rid = ASID2RID(asid, vrn);
                                                                                                                                                                                                                                
  rr_save.word = rr_read(vrn);
  rr.word = rr_save.word;
  rr.map.rid = rid;
  rr_write(vrn, rr.word);
  srlz_i();
        
        ventry = (vhpt_entry_t *) thash(va);
  tag = ttag(va);
  rr_write(vrn, rr_save.word);
  srlz_i();
  srlz_d();

        ventry->word[0]=entry.word[0];
        ventry->word[1]=entry.word[1];
        ventry->present.tag.tag_word = tag;
        

}

void vhpt_invalidate_all()
{
        memsetb((__address)vhpt_base,1<<VHPT_WIDTH,0);
}

void vhpt_invalidate_asid(asid_t asid)
{
        vhpt_invalidate_all();
}

---