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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  3.  * Copyright (C) 2006 Jakub Vana
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #include <arch/mm/page.h>
  31. #include <genarch/mm/page_ht.h>
  32. #include <mm/asid.h>
  33. #include <arch/types.h>
  34. #include <print.h>
  35. #include <mm/page.h>
  36. #include <mm/frame.h>
  37. #include <config.h>
  38. #include <panic.h>
  39. #include <arch/asm.h>
  40. #include <arch/barrier.h>
  41. #include <memstr.h>
  42.  
  43. /** Initialize VHPT and region registers. */
  44. static void set_vhpt_environment(void)
  45. {
  46.     region_register rr;
  47.     pta_register pta;  
  48.     int i;
  49.    
  50.     /*
  51.      * First set up kernel region register.
  52.      */
  53.     rr.word = rr_read(VRN_KERNEL);
  54.     rr.map.ve = 0;                  /* disable VHPT walker */
  55.     rr.map.ps = PAGE_WIDTH;
  56.     rr.map.rid = ASID_KERNEL;
  57.     rr_write(VRN_KERNEL, rr.word);
  58.     srlz_i();
  59.     srlz_d();
  60.    
  61.     /*
  62.      * And invalidate the rest of region register.
  63.      */
  64.     for(i = 0; i < REGION_REGISTERS; i++) {
  65.         /* skip kernel rr */
  66.         if (i == VRN_KERNEL)
  67.             continue;
  68.    
  69.         rr.word == rr_read(i);
  70.         rr.map.ve = 0;      /* disable VHPT walker */
  71.         rr.map.rid = ASID_INVALID;
  72.         rr_write(i, rr.word);
  73.         srlz_i();
  74.         srlz_d();
  75.     }
  76.  
  77.     /*
  78.      * Allocate VHPT and invalidate all its entries.
  79.      */
  80.     page_ht = (pte_t *) frame_alloc(FRAME_KA, VHPT_WIDTH - FRAME_WIDTH, NULL);
  81.     memsetb((__address) page_ht, VHPT_SIZE, 0);
  82.     ht_invalidate_all();   
  83.    
  84.     /*
  85.      * Set up PTA register.
  86.      */
  87.     pta.word = pta_read();
  88.     pta.map.ve = 0;                   /* disable VHPT walker */
  89.     pta.map.vf = 1;                   /* large entry format */
  90.     pta.map.size = VHPT_WIDTH;
  91.     pta.map.base = (__address) page_ht;
  92.     pta_write(pta.word);
  93.     srlz_i();
  94.     srlz_d();
  95. }
  96.  
  97. /** Initialize ia64 virtual address translation subsystem. */
  98. void page_arch_init(void)
  99. {
  100.     page_operations = &page_ht_operations;
  101.     pk_disable();
  102.     set_vhpt_environment();
  103. }
  104.  
  105. /** Calculate address of collision chain from VPN and ASID.
  106.  *
  107.  * This is rather non-trivial function.
  108.  * First, it has to translate ASID to RID.
  109.  * This is achieved by taking VRN bits of
  110.  * page into account.
  111.  * Second, it must preserve the region register
  112.  * it writes the RID to.
  113.  *
  114.  * @param page Address of virtual page including VRN bits.
  115.  * @param asid Address space identifier.
  116.  *
  117.  * @return Head of VHPT collision chain for page and asid.
  118.  */
  119. pte_t *vhpt_hash(__address page, asid_t asid)
  120. {
  121.     region_register rr_save, rr;
  122.     pte_t *t;
  123.  
  124.     rr_save.word = rr_read(VRN_WORK);
  125.     rr.word = rr_save.word;
  126.     if ((page >> VRN_SHIFT) != VRN_KERNEL)
  127.         rr.map.rid = (asid * RIDS_PER_ASID) + (page >> VRN_SHIFT);
  128.     else
  129.         rr.map.rid = ASID_KERNEL;
  130.     rr_write(VRN_WORK, rr.word);
  131.     srlz_i();
  132.     t = (pte_t *) thash((VRN_WORK << VRN_SHIFT) | (~(VRN_MASK) & page));
  133.     rr_write(VRN_WORK, rr_save.word);
  134.     srlz_i();
  135.     srlz_d();
  136.  
  137.     return t;
  138. }
  139.