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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.  /** @addtogroup ia64mm
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #ifndef __ia64_PAGE_H__
  37. #define __ia64_PAGE_H__
  38.  
  39. #include <arch/mm/frame.h>
  40.  
  41. #define PAGE_SIZE   FRAME_SIZE
  42. #define PAGE_WIDTH  FRAME_WIDTH
  43.  
  44.  
  45. #ifdef KERNEL
  46.  
  47. /** Bit width of the TLB-locked portion of kernel address space. */
  48. #define KERNEL_PAGE_WIDTH   28  /* 256M */
  49.  
  50. #define PPN_SHIFT           12
  51.  
  52. #define VRN_SHIFT           61
  53. #define VRN_MASK            (7LL << VRN_SHIFT)
  54. #define VA2VRN(va)          ((va)>>VRN_SHIFT)
  55.  
  56. #ifdef __ASM__
  57. #define VRN_KERNEL          7
  58. #else
  59. #define VRN_KERNEL          7LL
  60. #endif
  61.  
  62. #define REGION_REGISTERS        8
  63.  
  64. #define KA2PA(x)    ((__address) (x-(VRN_KERNEL<<VRN_SHIFT)))
  65. #define PA2KA(x)    ((__address) (x+(VRN_KERNEL<<VRN_SHIFT)))
  66.  
  67. #define VHPT_WIDTH          20          /* 1M */
  68. #define VHPT_SIZE           (1 << VHPT_WIDTH)
  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. #ifndef __ASM__
  86.  
  87. #include <arch/mm/frame.h>
  88. #include <arch/barrier.h>
  89. #include <genarch/mm/page_ht.h>
  90. #include <arch/mm/asid.h>
  91. #include <arch/types.h>
  92. #include <typedefs.h>
  93. #include <debug.h>
  94.  
  95. struct vhpt_tag_info {
  96.     unsigned long long tag : 63;
  97.     unsigned ti : 1;
  98. } __attribute__ ((packed));
  99.  
  100. union vhpt_tag {
  101.     struct vhpt_tag_info tag_info;
  102.     unsigned tag_word;
  103. };
  104.  
  105. struct vhpt_entry_present {
  106.     /* Word 0 */
  107.     unsigned p : 1;
  108.     unsigned : 1;
  109.     unsigned ma : 3;
  110.     unsigned a : 1;
  111.     unsigned d : 1;
  112.     unsigned pl : 2;
  113.     unsigned ar : 3;
  114.     unsigned long long ppn : 38;
  115.     unsigned : 2;
  116.     unsigned ed : 1;
  117.     unsigned ig1 : 11;
  118.    
  119.     /* Word 1 */
  120.     unsigned : 2;
  121.     unsigned ps : 6;
  122.     unsigned key : 24;
  123.     unsigned : 32;
  124.    
  125.     /* Word 2 */
  126.     union vhpt_tag tag;
  127.    
  128.     /* Word 3 */                                                   
  129.     __u64 ig3 : 64;
  130. } __attribute__ ((packed));
  131.  
  132. struct vhpt_entry_not_present {
  133.     /* Word 0 */
  134.     unsigned p : 1;
  135.     unsigned long long ig0 : 52;
  136.     unsigned ig1 : 11;
  137.    
  138.     /* Word 1 */
  139.     unsigned : 2;
  140.     unsigned ps : 6;
  141.     unsigned long long ig2 : 56;
  142.  
  143.     /* Word 2 */
  144.     union vhpt_tag tag;
  145.    
  146.     /* Word 3 */                                                   
  147.     __u64 ig3 : 64;
  148. } __attribute__ ((packed));
  149.  
  150. typedef union vhpt_entry {
  151.     struct vhpt_entry_present present;
  152.     struct vhpt_entry_not_present not_present;
  153.     __u64 word[4];
  154. } vhpt_entry_t;
  155.  
  156. struct region_register_map {
  157.     unsigned ve : 1;
  158.     unsigned : 1;
  159.     unsigned ps : 6;
  160.     unsigned rid : 24;
  161.     unsigned : 32;
  162. } __attribute__ ((packed));
  163.  
  164. typedef union region_register {
  165.     struct region_register_map map;
  166.     unsigned long long word;
  167. } region_register;
  168.  
  169. struct pta_register_map {
  170.     unsigned ve : 1;
  171.     unsigned : 1;
  172.     unsigned size : 6;
  173.     unsigned vf : 1;
  174.     unsigned : 6;
  175.     unsigned long long base : 49;
  176. } __attribute__ ((packed));
  177.  
  178. typedef union pta_register {
  179.     struct pta_register_map map;
  180.     __u64 word;
  181. } pta_register;
  182.  
  183. /** Return Translation Hashed Entry Address.
  184.  *
  185.  * VRN bits are used to read RID (ASID) from one
  186.  * of the eight region registers registers.
  187.  *
  188.  * @param va Virtual address including VRN bits.
  189.  *
  190.  * @return Address of the head of VHPT collision chain.
  191.  */
  192. static inline __u64 thash(__u64 va)
  193. {
  194.     __u64 ret;
  195.  
  196.     __asm__ volatile ("thash %0 = %1\n" : "=r" (ret) : "r" (va));
  197.  
  198.     return ret;
  199. }
  200.  
  201. /** Return Translation Hashed Entry Tag.
  202.  *
  203.  * VRN bits are used to read RID (ASID) from one
  204.  * of the eight region registers.
  205.  *
  206.  * @param va Virtual address including VRN bits.
  207.  *
  208.  * @return The unique tag for VPN and RID in the collision chain returned by thash().
  209.  */
  210. static inline __u64 ttag(__u64 va)
  211. {
  212.     __u64 ret;
  213.  
  214.     __asm__ volatile ("ttag %0 = %1\n" : "=r" (ret) : "r" (va));
  215.  
  216.     return ret;
  217. }
  218.  
  219. /** Read Region Register.
  220.  *
  221.  * @param i Region register index.
  222.  *
  223.  * @return Current contents of rr[i].
  224.  */
  225. static inline __u64 rr_read(index_t i)
  226. {
  227.     __u64 ret;
  228.     ASSERT(i < REGION_REGISTERS);
  229.     __asm__ volatile ("mov %0 = rr[%1]\n" : "=r" (ret) : "r" (i << VRN_SHIFT));
  230.     return ret;
  231. }
  232.  
  233. /** Write Region Register.
  234.  *
  235.  * @param i Region register index.
  236.  * @param v Value to be written to rr[i].
  237.  */
  238. static inline void rr_write(index_t i, __u64 v)
  239. {
  240.     ASSERT(i < REGION_REGISTERS);
  241.     __asm__ volatile (
  242.         "mov rr[%0] = %1\n"
  243.         :
  244.         : "r" (i << VRN_SHIFT), "r" (v)
  245.     );
  246. }
  247.  
  248. /** Read Page Table Register.
  249.  *
  250.  * @return Current value stored in PTA.
  251.  */
  252. static inline __u64 pta_read(void)
  253. {
  254.     __u64 ret;
  255.    
  256.     __asm__ volatile ("mov %0 = cr.pta\n" : "=r" (ret));
  257.    
  258.     return ret;
  259. }
  260.  
  261. /** Write Page Table Register.
  262.  *
  263.  * @param v New value to be stored in PTA.
  264.  */
  265. static inline void pta_write(__u64 v)
  266. {
  267.     __asm__ volatile ("mov cr.pta = %0\n" : : "r" (v));
  268. }
  269.  
  270. extern void page_arch_init(void);
  271.  
  272. extern vhpt_entry_t *vhpt_hash(__address page, asid_t asid);
  273. extern bool vhpt_compare(__address page, asid_t asid, vhpt_entry_t *v);
  274. extern void vhpt_set_record(vhpt_entry_t *v, __address page, asid_t asid, __address frame, int flags);
  275.  
  276. #endif /* __ASM__ */
  277.  
  278. #endif /* KERNEL */
  279.  
  280. #endif
  281.  
  282.  /** @}
  283.  */
  284.  
  285.