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  1. /*
  2.  * Copyright (C) 2005 - 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. #ifndef __ia64_PAGE_H__
  31. #define __ia64_PAGE_H__
  32.  
  33. #include <arch/mm/frame.h>
  34. #include <genarch/mm/page_ht.h>
  35. #include <arch/mm/asid.h>
  36. #include <arch/types.h>
  37. #include <typedefs.h>
  38. #include <debug.h>
  39.  
  40. #define PAGE_SIZE   FRAME_SIZE
  41. #define PAGE_WIDTH  FRAME_WIDTH
  42.  
  43. #define KA2PA(x)    ((__address) (x))
  44. #define PA2KA(x)    ((__address) (x))
  45.  
  46. #define GET_PTL0_ADDRESS_ARCH()         ((pte_t *) 0)
  47. #define SET_PTL0_ADDRESS_ARCH(ptl0)
  48.  
  49. /** Implementation of page hash table interface. */
  50. #define HT_ENTRIES_ARCH                 (VHPT_SIZE/sizeof(pte_t))
  51. #define HT_HASH_ARCH(page, asid)            vhpt_hash((page), (asid))
  52. #define HT_COMPARE_ARCH(page, asid, t)          vhpt_compare((page), (asid), (t))
  53. #define HT_SLOT_EMPTY_ARCH(t)               ((t)->present.tag.tag_info.ti)
  54. #define HT_INVALIDATE_SLOT_ARCH(t)          (t)->present.tag.tag_info.ti = true
  55. #define HT_GET_NEXT_ARCH(t)             (t)->present.next
  56. #define HT_SET_NEXT_ARCH(t, s)              (t)->present.next = (s)
  57. #define HT_SET_RECORD_ARCH(t, page, asid, frame, flags) vhpt_set_record(t, page, asid, frame, flags)
  58.  
  59. #define PPN_SHIFT           12
  60.  
  61. #define VRN_SHIFT           61
  62. #define VRN_MASK            (7LL << VRN_SHIFT)
  63. #define VRN_KERNEL          0
  64. #define REGION_REGISTERS        8
  65.  
  66. #define VHPT_WIDTH          20          /* 1M */
  67. #define VHPT_SIZE           (1<<VHPT_WIDTH)
  68. #define VHPT_BASE           page_ht     /* Must be aligned to VHPT_SIZE */
  69.  
  70. #define PTA_BASE_SHIFT          15
  71.  
  72. /** Memory Attributes. */
  73. #define MA_WRITEBACK    0x0
  74. #define MA_UNCACHEABLE  0x4
  75.  
  76. /** Privilege Levels. Only the most and the least privileged ones are ever used. */
  77. #define PL_KERNEL   0x0
  78. #define PL_USER     0x3
  79.  
  80. /* Access Rigths. Only certain combinations are used by the kernel. */
  81. #define AR_READ     0x0
  82. #define AR_EXECUTE  0x1
  83. #define AR_WRITE    0x2
  84.  
  85. struct vhpt_tag_info {
  86.     unsigned long long tag : 63;
  87.     unsigned ti : 1;
  88. } __attribute__ ((packed));
  89.  
  90. union vhpt_tag {
  91.     struct vhpt_tag_info tag_info;
  92.     unsigned tag_word;
  93. };
  94.  
  95. struct vhpt_entry_present {
  96.     /* Word 0 */
  97.     unsigned p : 1;
  98.     unsigned : 1;
  99.     unsigned ma : 3;
  100.     unsigned a : 1;
  101.     unsigned d : 1;
  102.     unsigned pl : 2;
  103.     unsigned ar : 3;
  104.     unsigned long long ppn : 38;
  105.     unsigned : 2;
  106.     unsigned ed : 1;
  107.     unsigned ig1 : 11;
  108.    
  109.     /* Word 1 */
  110.     unsigned : 2;
  111.     unsigned ps : 6;
  112.     unsigned key : 24;
  113.     unsigned : 32;
  114.    
  115.     /* Word 2 */
  116.     union vhpt_tag tag;
  117.    
  118.     /* Word 3 */                                                   
  119.     pte_t *next;            /**< Collision chain next pointer. */
  120. } __attribute__ ((packed));
  121.  
  122. struct vhpt_entry_not_present {
  123.     /* Word 0 */
  124.     unsigned p : 1;
  125.     unsigned long long ig0 : 52;
  126.     unsigned ig1 : 11;
  127.    
  128.     /* Word 1 */
  129.     unsigned : 2;
  130.     unsigned ps : 6;
  131.     unsigned long long ig2 : 56;
  132.  
  133.     /* Word 2 */
  134.     union vhpt_tag tag;
  135.    
  136.     /* Word 3 */                                                   
  137.     pte_t *next;            /**< Collision chain next pointer. */
  138.    
  139. } __attribute__ ((packed));
  140.  
  141. typedef union vhpt_entry {
  142.     struct vhpt_entry_present present;
  143.     struct vhpt_entry_not_present not_present;
  144.     __u64 word[4];
  145. } vhpt_entry;
  146.  
  147. struct region_register_map {
  148.     unsigned ve : 1;
  149.     unsigned : 1;
  150.     unsigned ps : 6;
  151.     unsigned rid : 24;
  152.     unsigned : 32;
  153. } __attribute__ ((packed));
  154.  
  155. typedef union region_register {
  156.     struct region_register_map map;
  157.     unsigned long long word;
  158. } region_register;
  159.  
  160. struct pta_register_map {
  161.     unsigned ve : 1;
  162.     unsigned : 1;
  163.     unsigned size : 6;
  164.     unsigned vf : 1;
  165.     unsigned : 6;
  166.     unsigned long long base : 49;
  167. } __attribute__ ((packed));
  168.  
  169. typedef union pta_register {
  170.     struct pta_register_map map;
  171.     __u64 word;
  172. } pta_register;
  173.  
  174. /** Return Translation Hashed Entry Address.
  175.  *
  176.  * VRN bits are used to read RID (ASID) from one
  177.  * of the eight region registers registers.
  178.  *
  179.  * @param va Virtual address including VRN bits.
  180.  *
  181.  * @return Address of the head of VHPT collision chain.
  182.  */
  183. static inline __u64 thash(__u64 va)
  184. {
  185.     __u64 ret;
  186.  
  187.     __asm__ volatile ("thash %0 = %1\n" : "=r" (ret) : "r" (va));
  188.  
  189.     return ret;
  190. }
  191.  
  192. /** Return Translation Hashed Entry Tag.
  193.  *
  194.  * VRN bits are used to read RID (ASID) from one
  195.  * of the eight region registers.
  196.  *
  197.  * @param va Virtual address including VRN bits.
  198.  *
  199.  * @return The unique tag for VPN and RID in the collision chain returned by thash().
  200.  */
  201. static inline __u64 ttag(__u64 va)
  202. {
  203.     __u64 ret;
  204.  
  205.     __asm__ volatile ("ttag %0 = %1\n" : "=r" (ret) : "r" (va));
  206.  
  207.     return ret;
  208. }
  209.  
  210. /** Read Region Register.
  211.  *
  212.  * @param i Region register index.
  213.  *
  214.  * @return Current contents of rr[i].
  215.  */
  216. static inline __u64 rr_read(index_t i)
  217. {
  218.     __u64 ret;
  219.    
  220.     ASSERT(i < REGION_REGISTERS);
  221.     __asm__ volatile ("mov %0 = rr[%1]\n" : "=r" (ret) : "r" (i));
  222.    
  223.     return ret;
  224. }
  225.  
  226.  
  227. /** Write Region Register.
  228.  *
  229.  * @param i Region register index.
  230.  * @param v Value to be written to rr[i].
  231.  */
  232. static inline void rr_write(index_t i, __u64 v)
  233. {
  234.     ASSERT(i < REGION_REGISTERS);
  235.     __asm__ volatile ("mov rr[%0] = %1\n" : : "r" (i), "r" (v));
  236. }
  237.  
  238. /** Read Page Table Register.
  239.  *
  240.  * @return Current value stored in PTA.
  241.  */
  242. static inline __u64 pta_read(void)
  243. {
  244.     __u64 ret;
  245.    
  246.     __asm__ volatile ("mov %0 = cr.pta\n" : "=r" (ret));
  247.    
  248.     return ret;
  249. }
  250.  
  251. /** Write Page Table Register.
  252.  *
  253.  * @param v New value to be stored in PTA.
  254.  */
  255. static inline void pta_write(__u64 v)
  256. {
  257.     __asm__ volatile ("mov cr.pta = %0\n" : : "r" (v));
  258. }
  259.  
  260. extern void page_arch_init(void);
  261. extern pte_t *vhpt_hash(__address page, asid_t asid);
  262. extern bool vhpt_compare(__address page, asid_t asid, pte_t *t);
  263. extern void vhpt_set_record(pte_t *t, __address page, asid_t asid, __address frame, int flags);
  264.  
  265. #endif
  266.