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#include <mm/frame.h>
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#include <mm/frame.h>
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#include <config.h>
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#include <config.h>
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#include <panic.h>
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#include <panic.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <arch/barrier.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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/** Initialize VHPT and region registers. */
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static void set_vhpt_environment(void)
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static void set_vhpt_environment(void)
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{
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{
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    region_register rr;
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    region_register rr;
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        /* skip kernel rr */
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        /* skip kernel rr */
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        if (i == VRN_KERNEL)
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        if (i == VRN_KERNEL)
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            continue;
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            continue;
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        rr.word == rr_read(i);
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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.map.rid = ASID_INVALID;
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        rr_write(i, rr.word);
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        rr_write(i, rr.word);
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        srlz_i();
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        srlz_i();
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        srlz_d();
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        srlz_d();
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    }
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    }
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    /*
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    /*
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     * Allocate VHPT and invalidate all its entries.
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     * Allocate VHPT and invalidate all its entries.
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     */
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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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    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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    ht_invalidate_all();   
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    /*
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    /*
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     * Set up PTA register.
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     * Set up PTA register.
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     */
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     */
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    pta.word = pta_read();
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    pta.word = pta_read();
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{
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{
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    page_operations = &page_ht_operations;
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    page_operations = &page_ht_operations;
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    pk_disable();
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    pk_disable();
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    set_vhpt_environment();
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    set_vhpt_environment();
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}
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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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}