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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 SET_PTL0_ADDRESS_ARCH(x)    /**< To be removed as situation permits. */
  47.  
  48. #define PPN_SHIFT           12
  49.  
  50. #define VRN_SHIFT           61
  51. #define VRN_MASK            (7LL << VRN_SHIFT)
  52. #define VRN_KERNEL          0
  53. #define REGION_REGISTERS        8
  54.  
  55. #define VHPT_WIDTH          20          /* 1M */
  56. #define VHPT_SIZE           (1 << VHPT_WIDTH)
  57. #define VHPT_BASE           0       /* Must be aligned to VHPT_SIZE */
  58.  
  59. #define PTA_BASE_SHIFT          15
  60.  
  61. /** Memory Attributes. */
  62. #define MA_WRITEBACK    0x0
  63. #define MA_UNCACHEABLE  0x4
  64.  
  65. /** Privilege Levels. Only the most and the least privileged ones are ever used. */
  66. #define PL_KERNEL   0x0
  67. #define PL_USER     0x3
  68.  
  69. /* Access Rigths. Only certain combinations are used by the kernel. */
  70. #define AR_READ     0x0
  71. #define AR_EXECUTE  0x1
  72. #define AR_WRITE    0x2
  73.  
  74.  
  75. #define VA_REGION_INDEX 61
  76.  
  77. #define VA_REGION(va) (va>>VA_REGION_INDEX)
  78.  
  79.  
  80.  
  81. struct vhpt_tag_info {
  82.     unsigned long long tag : 63;
  83.     unsigned ti : 1;
  84. } __attribute__ ((packed));
  85.  
  86. union vhpt_tag {
  87.     struct vhpt_tag_info tag_info;
  88.     unsigned tag_word;
  89. };
  90.  
  91. struct vhpt_entry_present {
  92.     /* Word 0 */
  93.     unsigned p : 1;
  94.     unsigned : 1;
  95.     unsigned ma : 3;
  96.     unsigned a : 1;
  97.     unsigned d : 1;
  98.     unsigned pl : 2;
  99.     unsigned ar : 3;
  100.     unsigned long long ppn : 38;
  101.     unsigned : 2;
  102.     unsigned ed : 1;
  103.     unsigned ig1 : 11;
  104.    
  105.     /* Word 1 */
  106.     unsigned : 2;
  107.     unsigned ps : 6;
  108.     unsigned key : 24;
  109.     unsigned : 32;
  110.    
  111.     /* Word 2 */
  112.     union vhpt_tag tag;
  113.    
  114.     /* Word 3 */                                                   
  115.     __u64 ig3 : 64;
  116. } __attribute__ ((packed));
  117.  
  118. struct vhpt_entry_not_present {
  119.     /* Word 0 */
  120.     unsigned p : 1;
  121.     unsigned long long ig0 : 52;
  122.     unsigned ig1 : 11;
  123.    
  124.     /* Word 1 */
  125.     unsigned : 2;
  126.     unsigned ps : 6;
  127.     unsigned long long ig2 : 56;
  128.  
  129.     /* Word 2 */
  130.     union vhpt_tag tag;
  131.    
  132.     /* Word 3 */                                                   
  133.     __u64 ig3 : 64;
  134. } __attribute__ ((packed));
  135.  
  136. typedef union vhpt_entry {
  137.     struct vhpt_entry_present present;
  138.     struct vhpt_entry_not_present not_present;
  139.     __u64 word[4];
  140. } vhpt_entry_t;
  141.  
  142. typedef vhpt_entry_t tlb_entry_t;
  143.  
  144. struct region_register_map {
  145.     unsigned ve : 1;
  146.     unsigned : 1;
  147.     unsigned ps : 6;
  148.     unsigned rid : 24;
  149.     unsigned : 32;
  150. } __attribute__ ((packed));
  151.  
  152. typedef union region_register {
  153.     struct region_register_map map;
  154.     unsigned long long word;
  155. } region_register;
  156.  
  157. struct pta_register_map {
  158.     unsigned ve : 1;
  159.     unsigned : 1;
  160.     unsigned size : 6;
  161.     unsigned vf : 1;
  162.     unsigned : 6;
  163.     unsigned long long base : 49;
  164. } __attribute__ ((packed));
  165.  
  166. typedef union pta_register {
  167.     struct pta_register_map map;
  168.     __u64 word;
  169. } pta_register;
  170.  
  171. /** Return Translation Hashed Entry Address.
  172.  *
  173.  * VRN bits are used to read RID (ASID) from one
  174.  * of the eight region registers registers.
  175.  *
  176.  * @param va Virtual address including VRN bits.
  177.  *
  178.  * @return Address of the head of VHPT collision chain.
  179.  */
  180. static inline __u64 thash(__u64 va)
  181. {
  182.     __u64 ret;
  183.  
  184.     __asm__ volatile ("thash %0 = %1\n" : "=r" (ret) : "r" (va));
  185.  
  186.     return ret;
  187. }
  188.  
  189. /** Return Translation Hashed Entry Tag.
  190.  *
  191.  * VRN bits are used to read RID (ASID) from one
  192.  * of the eight region registers.
  193.  *
  194.  * @param va Virtual address including VRN bits.
  195.  *
  196.  * @return The unique tag for VPN and RID in the collision chain returned by thash().
  197.  */
  198. static inline __u64 ttag(__u64 va)
  199. {
  200.     __u64 ret;
  201.  
  202.     __asm__ volatile ("ttag %0 = %1\n" : "=r" (ret) : "r" (va));
  203.  
  204.     return ret;
  205. }
  206.  
  207. /** Read Region Register.
  208.  *
  209.  * @param i Region register index.
  210.  *
  211.  * @return Current contents of rr[i].
  212.  */
  213. static inline __u64 rr_read(index_t i)
  214. {
  215.     __u64 ret;
  216.    
  217.     ASSERT(i < REGION_REGISTERS);
  218.     __asm__ volatile ("mov %0 = rr[%1]\n" : "=r" (ret) : "r" (i));
  219.    
  220.     return ret;
  221. }
  222.  
  223.  
  224. /** Write Region Register.
  225.  *
  226.  * @param i Region register index.
  227.  * @param v Value to be written to rr[i].
  228.  */
  229. static inline void rr_write(index_t i, __u64 v)
  230. {
  231.     ASSERT(i < REGION_REGISTERS);
  232.     __asm__ volatile (
  233.     "mov rr[%0] = %1;;\n"
  234.     :
  235.     : "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.  
  262. extern vhpt_entry_t *vhpt_hash(__address page, asid_t asid);
  263. extern bool vhpt_compare(__address page, asid_t asid, vhpt_entry_t *v);
  264. extern void vhpt_set_record(vhpt_entry_t *v, __address page, asid_t asid, __address frame, int flags);
  265.  
  266. #endif
  267.