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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 <typedefs.h>
  43. #include <print.h>
  44. #include <mm/page.h>
  45. #include <mm/frame.h>
  46. #include <config.h>
  47. #include <panic.h>
  48. #include <arch/asm.h>
  49. #include <arch/barrier.h>
  50. #include <memstr.h>
  51.  
  52. static void set_environment(void);
  53.  
  54. /** Initialize ia64 virtual address translation subsystem. */
  55. void page_arch_init(void)
  56. {
  57.     page_mapping_operations = &ht_mapping_operations;
  58.     pk_disable();
  59.     set_environment();
  60. }
  61.  
  62. /** Initialize VHPT and region registers. */
  63. void set_environment(void)
  64. {
  65.     region_register rr;
  66.     pta_register pta;  
  67.     int i;
  68. #ifdef CONFIG_VHPT 
  69.     uintptr_t vhpt_base;
  70. #endif
  71.  
  72.     /*
  73.      * First set up kernel region register.
  74.      * This is redundant (see start.S) but we keep it here just for sure.
  75.      */
  76.     rr.word = rr_read(VRN_KERNEL);
  77.     rr.map.ve = 0;                  /* disable VHPT walker */
  78.     rr.map.ps = PAGE_WIDTH;
  79.     rr.map.rid = ASID2RID(ASID_KERNEL, VRN_KERNEL);
  80.     rr_write(VRN_KERNEL, rr.word);
  81.     srlz_i();
  82.     srlz_d();
  83.  
  84.     /*
  85.      * And setup the rest of region register.
  86.      */
  87.     for(i = 0; i < REGION_REGISTERS; i++) {
  88.         /* skip kernel rr */
  89.         if (i == VRN_KERNEL)
  90.             continue;
  91.    
  92.         rr.word = rr_read(i);
  93.         rr.map.ve = 0;      /* disable VHPT walker */
  94.         rr.map.rid = RID_KERNEL;
  95.         rr.map.ps = PAGE_WIDTH;
  96.         rr_write(i, rr.word);
  97.         srlz_i();
  98.         srlz_d();
  99.     }
  100.  
  101. #ifdef CONFIG_VHPT 
  102.     vhpt_base = vhpt_set_up();
  103. #endif
  104.     /*
  105.      * Set up PTA register.
  106.      */
  107.     pta.word = pta_read();
  108. #ifndef CONFIG_VHPT
  109.     pta.map.ve = 0;                   /* disable VHPT walker */
  110.     pta.map.base = 0 >> PTA_BASE_SHIFT;
  111. #else
  112.     pta.map.ve = 1;                   /* enable VHPT walker */
  113.     pta.map.base = vhpt_base >> PTA_BASE_SHIFT;
  114. #endif
  115.     pta.map.vf = 1;                   /* large entry format */
  116.     pta.map.size = VHPT_WIDTH;
  117.     pta_write(pta.word);
  118.     srlz_i();
  119.     srlz_d();
  120. }
  121.  
  122. /** Calculate address of collision chain from VPN and ASID.
  123.  *
  124.  * Interrupts must be disabled.
  125.  *
  126.  * @param page Address of virtual page including VRN bits.
  127.  * @param asid Address space identifier.
  128.  *
  129.  * @return VHPT entry address.
  130.  */
  131. vhpt_entry_t *vhpt_hash(uintptr_t page, asid_t asid)
  132. {
  133.     region_register rr_save, rr;
  134.     index_t vrn;
  135.     rid_t rid;
  136.     vhpt_entry_t *v;
  137.  
  138.     vrn = page >> VRN_SHIFT;
  139.     rid = ASID2RID(asid, vrn);
  140.    
  141.     rr_save.word = rr_read(vrn);
  142.     if (rr_save.map.rid == rid) {
  143.         /*
  144.          * The RID is already in place, compute thash and return.
  145.          */
  146.         v = (vhpt_entry_t *) thash(page);
  147.         return v;
  148.     }
  149.    
  150.     /*
  151.      * The RID must be written to some region register.
  152.      * To speed things up, register indexed by vrn is used.
  153.      */
  154.     rr.word = rr_save.word;
  155.     rr.map.rid = rid;
  156.     rr_write(vrn, rr.word);
  157.     srlz_i();
  158.     v = (vhpt_entry_t *) thash(page);
  159.     rr_write(vrn, rr_save.word);
  160.     srlz_i();
  161.     srlz_d();
  162.  
  163.     return v;
  164. }
  165.  
  166. /** Compare ASID and VPN against PTE.
  167.  *
  168.  * Interrupts must be disabled.
  169.  *
  170.  * @param page Address of virtual page including VRN bits.
  171.  * @param asid Address space identifier.
  172.  *
  173.  * @return True if page and asid match the page and asid of t, false otherwise.
  174.  */
  175. bool vhpt_compare(uintptr_t page, asid_t asid, vhpt_entry_t *v)
  176. {
  177.     region_register rr_save, rr;   
  178.     index_t vrn;
  179.     rid_t rid;
  180.     bool match;
  181.  
  182.     ASSERT(v);
  183.  
  184.     vrn = page >> VRN_SHIFT;
  185.     rid = ASID2RID(asid, vrn);
  186.    
  187.     rr_save.word = rr_read(vrn);
  188.     if (rr_save.map.rid == rid) {
  189.         /*
  190.          * The RID is already in place, compare ttag with t and return.
  191.          */
  192.         return ttag(page) == v->present.tag.tag_word;
  193.     }
  194.    
  195.     /*
  196.      * The RID must be written to some region register.
  197.      * To speed things up, register indexed by vrn is used.
  198.      */
  199.     rr.word = rr_save.word;
  200.     rr.map.rid = rid;
  201.     rr_write(vrn, rr.word);
  202.     srlz_i();
  203.     match = (ttag(page) == v->present.tag.tag_word);
  204.     rr_write(vrn, rr_save.word);
  205.     srlz_i();
  206.     srlz_d();
  207.  
  208.     return match;      
  209. }
  210.  
  211. /** Set up one VHPT entry.
  212.  *
  213.  * @param v VHPT entry to be set up.
  214.  * @param page Virtual address of the page mapped by the entry.
  215.  * @param asid Address space identifier of the address space to which page belongs.
  216.  * @param frame Physical address of the frame to wich page is mapped.
  217.  * @param flags Different flags for the mapping.
  218.  */
  219. void vhpt_set_record(vhpt_entry_t *v, uintptr_t page, asid_t asid, uintptr_t frame, int flags)
  220. {
  221.     region_register rr_save, rr;   
  222.     index_t vrn;
  223.     rid_t rid;
  224.     uint64_t tag;
  225.  
  226.     ASSERT(v);
  227.  
  228.     vrn = page >> VRN_SHIFT;
  229.     rid = ASID2RID(asid, vrn);
  230.    
  231.     /*
  232.      * Compute ttag.
  233.      */
  234.     rr_save.word = rr_read(vrn);
  235.     rr.word = rr_save.word;
  236.     rr.map.rid = rid;
  237.     rr_write(vrn, rr.word);
  238.     srlz_i();
  239.     tag = ttag(page);
  240.     rr_write(vrn, rr_save.word);
  241.     srlz_i();
  242.     srlz_d();
  243.    
  244.     /*
  245.      * Clear the entry.
  246.      */
  247.     v->word[0] = 0;
  248.     v->word[1] = 0;
  249.     v->word[2] = 0;
  250.     v->word[3] = 0;
  251.    
  252.     v->present.p = true;
  253.     v->present.ma = (flags & PAGE_CACHEABLE) ? MA_WRITEBACK : MA_UNCACHEABLE;
  254.     v->present.a = false;   /* not accessed */
  255.     v->present.d = false;   /* not dirty */
  256.     v->present.pl = (flags & PAGE_USER) ? PL_USER : PL_KERNEL;
  257.     v->present.ar = (flags & PAGE_WRITE) ? AR_WRITE : AR_READ;
  258.     v->present.ar |= (flags & PAGE_EXEC) ? AR_EXECUTE : 0;
  259.     v->present.ppn = frame >> PPN_SHIFT;
  260.     v->present.ed = false;  /* exception not deffered */
  261.     v->present.ps = PAGE_WIDTH;
  262.     v->present.key = 0;
  263.     v->present.tag.tag_word = tag;
  264. }
  265.  
  266.  /** @}
  267.  */
  268.  
  269.