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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. /** @addtogroup ia64mm 
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <arch/mm/page.h>
  37. #include <genarch/mm/page_ht.h>
  38. #include <mm/asid.h>
  39. #include <arch/mm/asid.h>
  40. #include <arch/mm/vhpt.h>
  41. #include <arch/types.h>
  42. #include <print.h>
  43. #include <mm/page.h>
  44. #include <mm/frame.h>
  45. #include <config.h>
  46. #include <panic.h>
  47. #include <arch/asm.h>
  48. #include <arch/barrier.h>
  49. #include <memstr.h>
  50.  
  51. static void set_environment(void);
  52.  
  53. /** Initialize ia64 virtual address translation subsystem. */
  54. void page_arch_init(void)
  55. {
  56.     page_mapping_operations = &ht_mapping_operations;
  57.     pk_disable();
  58.     set_environment();
  59. }
  60.  
  61. /** Initialize VHPT and region registers. */
  62. void set_environment(void)
  63. {
  64.     region_register rr;
  65.     pta_register pta;  
  66.     int i;
  67. #ifdef CONFIG_VHPT 
  68.     uintptr_t vhpt_base;
  69. #endif
  70.  
  71.     /*
  72.      * First set up kernel region register.
  73.      * This is redundant (see start.S) but we keep it here just for sure.
  74.      */
  75.     rr.word = rr_read(VRN_KERNEL);
  76.     rr.map.ve = 0;                  /* disable VHPT walker */
  77.     rr.map.ps = PAGE_WIDTH;
  78.     rr.map.rid = ASID2RID(ASID_KERNEL, VRN_KERNEL);
  79.     rr_write(VRN_KERNEL, rr.word);
  80.     srlz_i();
  81.     srlz_d();
  82.  
  83.     /*
  84.      * And setup the rest of region register.
  85.      */
  86.     for(i = 0; i < REGION_REGISTERS; i++) {
  87.         /* skip kernel rr */
  88.         if (i == VRN_KERNEL)
  89.             continue;
  90.    
  91.         rr.word = rr_read(i);
  92.         rr.map.ve = 0;      /* disable VHPT walker */
  93.         rr.map.rid = RID_KERNEL;
  94.         rr.map.ps = PAGE_WIDTH;
  95.         rr_write(i, rr.word);
  96.         srlz_i();
  97.         srlz_d();
  98.     }
  99.  
  100. #ifdef CONFIG_VHPT 
  101.     vhpt_base = vhpt_set_up();
  102. #endif
  103.     /*
  104.      * Set up PTA register.
  105.      */
  106.     pta.word = pta_read();
  107. #ifndef CONFIG_VHPT
  108.     pta.map.ve = 0;                   /* disable VHPT walker */
  109.     pta.map.base = 0 >> PTA_BASE_SHIFT;
  110. #else
  111.     pta.map.ve = 1;                   /* enable VHPT walker */
  112.     pta.map.base = vhpt_base >> PTA_BASE_SHIFT;
  113. #endif
  114.     pta.map.vf = 1;                   /* large entry format */
  115.     pta.map.size = VHPT_WIDTH;
  116.     pta_write(pta.word);
  117.     srlz_i();
  118.     srlz_d();
  119. }
  120.  
  121. /** Calculate address of collision chain from VPN and ASID.
  122.  *
  123.  * Interrupts must be disabled.
  124.  *
  125.  * @param page Address of virtual page including VRN bits.
  126.  * @param asid Address space identifier.
  127.  *
  128.  * @return VHPT entry address.
  129.  */
  130. vhpt_entry_t *vhpt_hash(uintptr_t page, asid_t asid)
  131. {
  132.     region_register rr_save, rr;
  133.     index_t vrn;
  134.     rid_t rid;
  135.     vhpt_entry_t *v;
  136.  
  137.     vrn = page >> VRN_SHIFT;
  138.     rid = ASID2RID(asid, vrn);
  139.    
  140.     rr_save.word = rr_read(vrn);
  141.     if (rr_save.map.rid == rid) {
  142.         /*
  143.          * The RID is already in place, compute thash and return.
  144.          */
  145.         v = (vhpt_entry_t *) thash(page);
  146.         return v;
  147.     }
  148.    
  149.     /*
  150.      * The RID must be written to some region register.
  151.      * To speed things up, register indexed by vrn is used.
  152.      */
  153.     rr.word = rr_save.word;
  154.     rr.map.rid = rid;
  155.     rr_write(vrn, rr.word);
  156.     srlz_i();
  157.     v = (vhpt_entry_t *) thash(page);
  158.     rr_write(vrn, rr_save.word);
  159.     srlz_i();
  160.     srlz_d();
  161.  
  162.     return v;
  163. }
  164.  
  165. /** Compare ASID and VPN against PTE.
  166.  *
  167.  * Interrupts must be disabled.
  168.  *
  169.  * @param page Address of virtual page including VRN bits.
  170.  * @param asid Address space identifier.
  171.  *
  172.  * @return True if page and asid match the page and asid of t, false otherwise.
  173.  */
  174. bool vhpt_compare(uintptr_t page, asid_t asid, vhpt_entry_t *v)
  175. {
  176.     region_register rr_save, rr;   
  177.     index_t vrn;
  178.     rid_t rid;
  179.     bool match;
  180.  
  181.     ASSERT(v);
  182.  
  183.     vrn = page >> VRN_SHIFT;
  184.     rid = ASID2RID(asid, vrn);
  185.    
  186.     rr_save.word = rr_read(vrn);
  187.     if (rr_save.map.rid == rid) {
  188.         /*
  189.          * The RID is already in place, compare ttag with t and return.
  190.          */
  191.         return ttag(page) == v->present.tag.tag_word;
  192.     }
  193.    
  194.     /*
  195.      * The RID must be written to some region register.
  196.      * To speed things up, register indexed by vrn is used.
  197.      */
  198.     rr.word = rr_save.word;
  199.     rr.map.rid = rid;
  200.     rr_write(vrn, rr.word);
  201.     srlz_i();
  202.     match = (ttag(page) == v->present.tag.tag_word);
  203.     rr_write(vrn, rr_save.word);
  204.     srlz_i();
  205.     srlz_d();
  206.  
  207.     return match;      
  208. }
  209.  
  210. /** Set up one VHPT entry.
  211.  *
  212.  * @param v VHPT entry to be set up.
  213.  * @param page Virtual address of the page mapped by the entry.
  214.  * @param asid Address space identifier of the address space to which page belongs.
  215.  * @param frame Physical address of the frame to wich page is mapped.
  216.  * @param flags Different flags for the mapping.
  217.  */
  218. void vhpt_set_record(vhpt_entry_t *v, uintptr_t page, asid_t asid, uintptr_t frame, int flags)
  219. {
  220.     region_register rr_save, rr;   
  221.     index_t vrn;
  222.     rid_t rid;
  223.     uint64_t tag;
  224.  
  225.     ASSERT(v);
  226.  
  227.     vrn = page >> VRN_SHIFT;
  228.     rid = ASID2RID(asid, vrn);
  229.    
  230.     /*
  231.      * Compute ttag.
  232.      */
  233.     rr_save.word = rr_read(vrn);
  234.     rr.word = rr_save.word;
  235.     rr.map.rid = rid;
  236.     rr_write(vrn, rr.word);
  237.     srlz_i();
  238.     tag = ttag(page);
  239.     rr_write(vrn, rr_save.word);
  240.     srlz_i();
  241.     srlz_d();
  242.    
  243.     /*
  244.      * Clear the entry.
  245.      */
  246.     v->word[0] = 0;
  247.     v->word[1] = 0;
  248.     v->word[2] = 0;
  249.     v->word[3] = 0;
  250.    
  251.     v->present.p = true;
  252.     v->present.ma = (flags & PAGE_CACHEABLE) ? MA_WRITEBACK : MA_UNCACHEABLE;
  253.     v->present.a = false;   /* not accessed */
  254.     v->present.d = false;   /* not dirty */
  255.     v->present.pl = (flags & PAGE_USER) ? PL_USER : PL_KERNEL;
  256.     v->present.ar = (flags & PAGE_WRITE) ? AR_WRITE : AR_READ;
  257.     v->present.ar |= (flags & PAGE_EXEC) ? AR_EXECUTE : 0;
  258.     v->present.ppn = frame >> PPN_SHIFT;
  259.     v->present.ed = false;  /* exception not deffered */
  260.     v->present.ps = PAGE_WIDTH;
  261.     v->present.key = 0;
  262.     v->present.tag.tag_word = tag;
  263. }
  264.  
  265. /** @}
  266.  */
  267.