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/*
 * Copyright (C) 2006 Jakub Jermar
 * 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/page.h>
#include <arch/types.h>
#include <genarch/mm/page_ht.h>
#include <mm/page.h>
#include <config.h>
#include <panic.h>

__u64 thash(__u64 va);
__u64 thash(__u64 va)
{
    __u64 ret;
    asm
    (
        "thash %0=%1;;"
        :"=r"(ret)
        :"r" (va)
    );
    
    return ret;
}

__u64 ttag(__u64 va);
__u64 ttag(__u64 va)
{
    __u64 ret;
    asm
    (
        "ttag %0=%1;;"
        :"=r"(ret)
        :"r" (va)
    );
    
    return ret;
}


static void set_VHPT_environment(void)
{
    return;

    /*
    TODO:
    */
    
    int i;
    
    /* First set up REGION REGISTER 0 */
    
    region_register rr;
    rr.map.ve=0;                  /*Disable Walker*/
    rr.map.ps=PAGE_WIDTH;
    rr.map.rid=REGION_RID_MAIN;
    
    asm
    (
        "mov rr[r0]=%0;;"
        :
        :"r"(rr.word)
    );
        
    /* And Invalidate the rest of REGION REGISTERS */
    
    for(i=1;i<REGION_REGISTERS;i++)
    {
        rr.map.rid=REGION_RID_FIRST_INVALID+i-1;
        asm
        (
            "mov r8=%1;;"
            "mov rr[r8]=%0;;"
            :
            :"r"(rr.word),"r"(i)
            :"r8"
        );
    };

    PTA_register pta;
    pta.map.ve=0;                   /*Disable Walker*/
    pta.map.vf=1;                   /*Large entry format*/
    pta.map.size=VHPT_WIDTH;
    pta.map.base=VHPT_BASE;
    
    
    /*Write PTA*/
    asm
    (
        "mov cr8=%0;;"
        :
        :"r"(pta.word)
    );  
    
}   


void page_arch_init(void)
{
    page_operations = &page_ht_operations;
    set_VHPT_environment();
}