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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 KERN_ia64_PAGE_H_
  37. #define KERN_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. #define PAGE_COLOR_BITS 0           /* dummy */
  45.  
  46. #ifdef KERNEL
  47.  
  48. /** Bit width of the TLB-locked portion of kernel address space. */
  49. #define KERNEL_PAGE_WIDTH       28  /* 256M */
  50. #define IO_PAGE_WIDTH           26  /* 64M */
  51.  
  52.  
  53. #define PPN_SHIFT           12
  54.  
  55. #define VRN_SHIFT           61
  56. #define VRN_MASK            (7LL << VRN_SHIFT)
  57. #define VA2VRN(va)          ((va)>>VRN_SHIFT)
  58.  
  59. #ifdef __ASM__
  60. #define VRN_KERNEL          7
  61. #else
  62. #define VRN_KERNEL          7LL
  63. #endif
  64.  
  65. #define REGION_REGISTERS        8
  66.  
  67. #define KA2PA(x)    ((uintptr_t) (x-(VRN_KERNEL<<VRN_SHIFT)))
  68. #define PA2KA(x)    ((uintptr_t) (x+(VRN_KERNEL<<VRN_SHIFT)))
  69.  
  70. #define VHPT_WIDTH          20  /* 1M */
  71. #define VHPT_SIZE           (1 << VHPT_WIDTH)
  72.  
  73. #define PTA_BASE_SHIFT          15
  74.  
  75. /** Memory Attributes. */
  76. #define MA_WRITEBACK    0x0
  77. #define MA_UNCACHEABLE  0x4
  78.  
  79. /** Privilege Levels. Only the most and the least privileged ones are ever used. */
  80. #define PL_KERNEL   0x0
  81. #define PL_USER     0x3
  82.  
  83. /* Access Rigths. Only certain combinations are used by the kernel. */
  84. #define AR_READ     0x0
  85. #define AR_EXECUTE  0x1
  86. #define AR_WRITE    0x2
  87.  
  88. #ifndef __ASM__
  89.  
  90. #include <arch/mm/as.h>
  91. #include <arch/mm/frame.h>
  92. #include <arch/interrupt.h>
  93. #include <arch/barrier.h>
  94. #include <arch/mm/asid.h>
  95. #include <arch/types.h>
  96. #include <debug.h>
  97.  
  98. struct vhpt_tag_info {
  99.     unsigned long long tag : 63;
  100.     unsigned ti : 1;
  101. } __attribute__ ((packed));
  102.  
  103. union vhpt_tag {
  104.     struct vhpt_tag_info tag_info;
  105.     unsigned tag_word;
  106. };
  107.  
  108. struct vhpt_entry_present {
  109.     /* Word 0 */
  110.     unsigned p : 1;
  111.     unsigned : 1;
  112.     unsigned ma : 3;
  113.     unsigned a : 1;
  114.     unsigned d : 1;
  115.     unsigned pl : 2;
  116.     unsigned ar : 3;
  117.     unsigned long long ppn : 38;
  118.     unsigned : 2;
  119.     unsigned ed : 1;
  120.     unsigned ig1 : 11;
  121.    
  122.     /* Word 1 */
  123.     unsigned : 2;
  124.     unsigned ps : 6;
  125.     unsigned key : 24;
  126.     unsigned : 32;
  127.    
  128.     /* Word 2 */
  129.     union vhpt_tag tag;
  130.    
  131.     /* Word 3 */                                                   
  132.     uint64_t ig3 : 64;
  133. } __attribute__ ((packed));
  134.  
  135. struct vhpt_entry_not_present {
  136.     /* Word 0 */
  137.     unsigned p : 1;
  138.     unsigned long long ig0 : 52;
  139.     unsigned ig1 : 11;
  140.    
  141.     /* Word 1 */
  142.     unsigned : 2;
  143.     unsigned ps : 6;
  144.     unsigned long long ig2 : 56;
  145.  
  146.     /* Word 2 */
  147.     union vhpt_tag tag;
  148.    
  149.     /* Word 3 */                                                   
  150.     uint64_t ig3 : 64;
  151. } __attribute__ ((packed));
  152.  
  153. typedef union vhpt_entry {
  154.     struct vhpt_entry_present present;
  155.     struct vhpt_entry_not_present not_present;
  156.     uint64_t word[4];
  157. } vhpt_entry_t;
  158.  
  159. struct region_register_map {
  160.     unsigned ve : 1;
  161.     unsigned : 1;
  162.     unsigned ps : 6;
  163.     unsigned rid : 24;
  164.     unsigned : 32;
  165. } __attribute__ ((packed));
  166.  
  167. typedef union region_register {
  168.     struct region_register_map map;
  169.     unsigned long long word;
  170. } region_register;
  171.  
  172. struct pta_register_map {
  173.     unsigned ve : 1;
  174.     unsigned : 1;
  175.     unsigned size : 6;
  176.     unsigned vf : 1;
  177.     unsigned : 6;
  178.     unsigned long long base : 49;
  179. } __attribute__ ((packed));
  180.  
  181. typedef union pta_register {
  182.     struct pta_register_map map;
  183.     uint64_t word;
  184. } pta_register;
  185.  
  186. /** Return Translation Hashed Entry Address.
  187.  *
  188.  * VRN bits are used to read RID (ASID) from one
  189.  * of the eight region registers registers.
  190.  *
  191.  * @param va Virtual address including VRN bits.
  192.  *
  193.  * @return Address of the head of VHPT collision chain.
  194.  */
  195. static inline uint64_t thash(uint64_t va)
  196. {
  197.     uint64_t ret;
  198.  
  199.     asm volatile ("thash %0 = %1\n" : "=r" (ret) : "r" (va));
  200.  
  201.     return ret;
  202. }
  203.  
  204. /** Return Translation Hashed Entry Tag.
  205.  *
  206.  * VRN bits are used to read RID (ASID) from one
  207.  * of the eight region registers.
  208.  *
  209.  * @param va Virtual address including VRN bits.
  210.  *
  211.  * @return The unique tag for VPN and RID in the collision chain returned by thash().
  212.  */
  213. static inline uint64_t ttag(uint64_t va)
  214. {
  215.     uint64_t ret;
  216.  
  217.     asm volatile ("ttag %0 = %1\n" : "=r" (ret) : "r" (va));
  218.  
  219.     return ret;
  220. }
  221.  
  222. /** Read Region Register.
  223.  *
  224.  * @param i Region register index.
  225.  *
  226.  * @return Current contents of rr[i].
  227.  */
  228. static inline uint64_t rr_read(index_t i)
  229. {
  230.     uint64_t ret;
  231.     ASSERT(i < REGION_REGISTERS);
  232.     asm volatile ("mov %0 = rr[%1]\n" : "=r" (ret) : "r" (i << VRN_SHIFT));
  233.     return ret;
  234. }
  235.  
  236. /** Write Region Register.
  237.  *
  238.  * @param i Region register index.
  239.  * @param v Value to be written to rr[i].
  240.  */
  241. static inline void rr_write(index_t i, uint64_t v)
  242. {
  243.     ASSERT(i < REGION_REGISTERS);
  244.     asm volatile (
  245.         "mov rr[%0] = %1\n"
  246.         :
  247.         : "r" (i << VRN_SHIFT), "r" (v)
  248.     );
  249. }
  250.  
  251. /** Read Page Table Register.
  252.  *
  253.  * @return Current value stored in PTA.
  254.  */
  255. static inline uint64_t pta_read(void)
  256. {
  257.     uint64_t ret;
  258.    
  259.     asm volatile ("mov %0 = cr.pta\n" : "=r" (ret));
  260.    
  261.     return ret;
  262. }
  263.  
  264. /** Write Page Table Register.
  265.  *
  266.  * @param v New value to be stored in PTA.
  267.  */
  268. static inline void pta_write(uint64_t v)
  269. {
  270.     asm volatile ("mov cr.pta = %0\n" : : "r" (v));
  271. }
  272.  
  273. extern void page_arch_init(void);
  274.  
  275. extern vhpt_entry_t *vhpt_hash(uintptr_t page, asid_t asid);
  276. extern bool vhpt_compare(uintptr_t page, asid_t asid, vhpt_entry_t *v);
  277. extern void vhpt_set_record(vhpt_entry_t *v, uintptr_t page, asid_t asid, uintptr_t frame, int flags);
  278.  
  279. #endif /* __ASM__ */
  280.  
  281. #endif /* KERNEL */
  282.  
  283. #endif
  284.  
  285. /** @}
  286.  */
  287.