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/*
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 * Copyright (C) 2006 Jakub Jermar
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 * Copyright (C) 2006 Jakub Vana
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch/mm/page.h>
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#include <genarch/mm/page_ht.h>
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#include <mm/asid.h>
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#include <arch/types.h>
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#include <print.h>
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#include <mm/page.h>
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#include <mm/frame.h>
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#include <config.h>
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#include <panic.h>
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#include <arch/asm.h>
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#include <arch/barrier.h>
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#include <memstr.h>
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/** Initialize VHPT and region registers. */
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static void set_vhpt_environment(void)
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{
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    region_register rr;
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    pta_register pta;  
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    int i;
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    /*
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     * First set up kernel region register.
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     */
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    rr.word = rr_read(VRN_KERNEL);
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    rr.map.ve = 0;                  /* disable VHPT walker */
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    rr.map.ps = PAGE_WIDTH;
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    rr.map.rid = ASID_KERNEL;
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    rr_write(VRN_KERNEL, rr.word);
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    srlz_i();
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    srlz_d();
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    /*
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     * And invalidate the rest of region register.
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     */
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    for(i = 0; i < REGION_REGISTERS; i++) {
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        /* skip kernel rr */
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        if (i == VRN_KERNEL)
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            continue;
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        rr.word == rr_read(i);
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        rr.map.ve = 0;      /* disable VHPT walker */
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        rr.map.rid = ASID_INVALID;
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        rr_write(i, rr.word);
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        srlz_i();
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        srlz_d();
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    }
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    /*
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     * Allocate VHPT and invalidate all its entries.
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     */
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    page_ht = (pte_t *) frame_alloc(FRAME_KA, VHPT_WIDTH - FRAME_WIDTH, NULL);
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    memsetb((__address) page_ht, VHPT_SIZE, 0);
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    ht_invalidate_all();   
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    /*
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     * Set up PTA register.
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     */
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    pta.word = pta_read();
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    pta.map.ve = 0;                   /* disable VHPT walker */
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    pta.map.vf = 1;                   /* large entry format */
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    pta.map.size = VHPT_WIDTH;
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    pta.map.base = (__address) page_ht;
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    pta_write(pta.word);
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    srlz_i();
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    srlz_d();
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}
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/** Initialize ia64 virtual address translation subsystem. */
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void page_arch_init(void)
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{
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    page_operations = &page_ht_operations;
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    pk_disable();
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    set_vhpt_environment();
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}
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/** Calculate address of collision chain from VPN and ASID.
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 *
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 * This is rather non-trivial function.
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 * First, it has to translate ASID to RID.
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 * This is achieved by taking VRN bits of
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 * page into account.
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 * Second, it must preserve the region register
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 * it writes the RID to.
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 *
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 * @param page Address of virtual page including VRN bits.
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 * @param asid Address space identifier.
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 *
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 * @return Head of VHPT collision chain for page and asid.
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 */
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pte_t *vhpt_hash(__address page, asid_t asid)
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{
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    region_register rr_save, rr;
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    pte_t *t;
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    rr_save.word = rr_read(VRN_WORK);
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    rr.word = rr_save.word;
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    if ((page >> VRN_SHIFT) != VRN_KERNEL)
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        rr.map.rid = (asid * RIDS_PER_ASID) + (page >> VRN_SHIFT);
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    else
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        rr.map.rid = ASID_KERNEL;
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    rr_write(VRN_WORK, rr.word);
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    srlz_i();
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    t = (pte_t *) thash((VRN_WORK << VRN_SHIFT) | (~(VRN_MASK) & page));
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    rr_write(VRN_WORK, rr_save.word);
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    srlz_i();
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    srlz_d();
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    return t;
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}