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  1. /*
  2.  * Copyright (c) 2006 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup ppc32mm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <mm/tlb.h>
  36. #include <arch/mm/tlb.h>
  37. #include <arch/interrupt.h>
  38. #include <mm/as.h>
  39. #include <arch.h>
  40. #include <print.h>
  41. #include <symtab.h>
  42.  
  43.  
  44. /** Try to find PTE for faulting address
  45.  *
  46.  * Try to find PTE for faulting address.
  47.  * The as->lock must be held on entry to this function
  48.  * if lock is true.
  49.  *
  50.  * @param as       Address space.
  51.  * @param lock     Lock/unlock the address space.
  52.  * @param badvaddr Faulting virtual address.
  53.  * @param access   Access mode that caused the fault.
  54.  * @param istate   Pointer to interrupted state.
  55.  * @param pfrc     Pointer to variable where as_page_fault() return code will be stored.
  56.  * @return         PTE on success, NULL otherwise.
  57.  *
  58.  */
  59. static pte_t *find_mapping_and_check(as_t *as, bool lock, uintptr_t badvaddr, int access, istate_t *istate, int *pfrc)
  60. {
  61.     /*
  62.      * Check if the mapping exists in page tables.
  63.      */
  64.     pte_t *pte = page_mapping_find(as, badvaddr);
  65.     if ((pte) && (pte->p)) {
  66.         /*
  67.          * Mapping found in page tables.
  68.          * Immediately succeed.
  69.          */
  70.         return pte;
  71.     } else {
  72.         int rc;
  73.    
  74.         /*
  75.          * Mapping not found in page tables.
  76.          * Resort to higher-level page fault handler.
  77.          */
  78.         page_table_unlock(as, lock);
  79.         switch (rc = as_page_fault(badvaddr, access, istate)) {
  80.             case AS_PF_OK:
  81.                 /*
  82.                  * The higher-level page fault handler succeeded,
  83.                  * The mapping ought to be in place.
  84.                  */
  85.                 page_table_lock(as, lock);
  86.                 pte = page_mapping_find(as, badvaddr);
  87.                 ASSERT((pte) && (pte->p));
  88.                 *pfrc = 0;
  89.                 return pte;
  90.             case AS_PF_DEFER:
  91.                 page_table_lock(as, lock);
  92.                 *pfrc = rc;
  93.                 return NULL;
  94.             case AS_PF_FAULT:
  95.                 page_table_lock(as, lock);
  96.                 printf("Page fault.\n");
  97.                 *pfrc = rc;
  98.                 return NULL;
  99.             default:
  100.                 panic("unexpected rc (%d)\n", rc);
  101.         }  
  102.     }
  103. }
  104.  
  105.  
  106. static void pht_refill_fail(uintptr_t badvaddr, istate_t *istate)
  107. {
  108.     char *symbol = "";
  109.     char *sym2 = "";
  110.  
  111.     char *s = get_symtab_entry(istate->pc);
  112.     if (s)
  113.         symbol = s;
  114.     s = get_symtab_entry(istate->lr);
  115.     if (s)
  116.         sym2 = s;
  117.     panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
  118. }
  119.  
  120.  
  121. static void pht_insert(const uintptr_t vaddr, const pfn_t pfn)
  122. {
  123.     uint32_t page = (vaddr >> 12) & 0xffff;
  124.     uint32_t api = (vaddr >> 22) & 0x3f;
  125.    
  126.     uint32_t vsid;
  127.     asm volatile (
  128.         "mfsrin %0, %1\n"
  129.         : "=r" (vsid)
  130.         : "r" (vaddr)
  131.     );
  132.    
  133.     uint32_t sdr1;
  134.     asm volatile (
  135.         "mfsdr1 %0\n"
  136.         : "=r" (sdr1)
  137.     );
  138.     phte_t *phte = (phte_t *) PA2KA(sdr1 & 0xffff0000);
  139.    
  140.     /* Primary hash (xor) */
  141.     uint32_t h = 0;
  142.     uint32_t hash = vsid ^ page;
  143.     uint32_t base = (hash & 0x3ff) << 3;
  144.     uint32_t i;
  145.     bool found = false;
  146.    
  147.     /* Find unused or colliding
  148.        PTE in PTEG */
  149.     for (i = 0; i < 8; i++) {
  150.         if ((!phte[base + i].v) || ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {
  151.             found = true;
  152.             break;
  153.         }
  154.     }
  155.    
  156.     if (!found) {
  157.         /* Secondary hash (not) */
  158.         uint32_t base2 = (~hash & 0x3ff) << 3;
  159.        
  160.         /* Find unused or colliding
  161.            PTE in PTEG */
  162.         for (i = 0; i < 8; i++) {
  163.             if ((!phte[base2 + i].v) || ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {
  164.                 found = true;
  165.                 base = base2;
  166.                 h = 1;
  167.                 break;
  168.             }
  169.         }
  170.        
  171.         if (!found) {
  172.             // TODO: A/C precedence groups
  173.             i = page % 8;
  174.         }
  175.     }
  176.    
  177.     phte[base + i].v = 1;
  178.     phte[base + i].vsid = vsid;
  179.     phte[base + i].h = h;
  180.     phte[base + i].api = api;
  181.     phte[base + i].rpn = pfn;
  182.     phte[base + i].r = 0;
  183.     phte[base + i].c = 0;
  184.     phte[base + i].pp = 2; // FIXME
  185. }
  186.  
  187.  
  188. static void pht_real_insert(const uintptr_t vaddr, const pfn_t pfn)
  189. {
  190.     uint32_t page = (vaddr >> 12) & 0xffff;
  191.     uint32_t api = (vaddr >> 22) & 0x3f;
  192.    
  193.     uint32_t vsid;
  194.     asm volatile (
  195.         "mfsrin %0, %1\n"
  196.         : "=r" (vsid)
  197.         : "r" (vaddr)
  198.     );
  199.    
  200.     uint32_t sdr1;
  201.     asm volatile (
  202.         "mfsdr1 %0\n"
  203.         : "=r" (sdr1)
  204.     );
  205.     phte_t *phte_physical = (phte_t *) (sdr1 & 0xffff0000);
  206.    
  207.     /* Primary hash (xor) */
  208.     uint32_t h = 0;
  209.     uint32_t hash = vsid ^ page;
  210.     uint32_t base = (hash & 0x3ff) << 3;
  211.     uint32_t i;
  212.     bool found = false;
  213.    
  214.     /* Find unused or colliding
  215.        PTE in PTEG */
  216.     for (i = 0; i < 8; i++) {
  217.         if ((!phte_physical[base + i].v) || ((phte_physical[base + i].vsid == vsid) && (phte_physical[base + i].api == api))) {
  218.             found = true;
  219.             break;
  220.         }
  221.     }
  222.    
  223.     if (!found) {
  224.         /* Secondary hash (not) */
  225.         uint32_t base2 = (~hash & 0x3ff) << 3;
  226.        
  227.         /* Find unused or colliding
  228.            PTE in PTEG */
  229.         for (i = 0; i < 8; i++) {
  230.             if ((!phte_physical[base2 + i].v) || ((phte_physical[base2 + i].vsid == vsid) && (phte_physical[base2 + i].api == api))) {
  231.                 found = true;
  232.                 base = base2;
  233.                 h = 1;
  234.                 break;
  235.             }
  236.         }
  237.        
  238.         if (!found) {
  239.             // TODO: A/C precedence groups
  240.             i = page % 8;
  241.         }
  242.     }
  243.    
  244.     phte_physical[base + i].v = 1;
  245.     phte_physical[base + i].vsid = vsid;
  246.     phte_physical[base + i].h = h;
  247.     phte_physical[base + i].api = api;
  248.     phte_physical[base + i].rpn = pfn;
  249.     phte_physical[base + i].r = 0;
  250.     phte_physical[base + i].c = 0;
  251.     phte_physical[base + i].pp = 2; // FIXME
  252. }
  253.  
  254.  
  255. /** Process Instruction/Data Storage Interrupt
  256.  *
  257.  * @param n Interrupt vector number.
  258.  * @param istate Interrupted register context.
  259.  *
  260.  */
  261. void pht_refill(int n, istate_t *istate)
  262. {
  263.     uintptr_t badvaddr;
  264.     pte_t *pte;
  265.     int pfrc;
  266.     as_t *as;
  267.     bool lock;
  268.    
  269.     if (AS == NULL) {
  270.         as = AS_KERNEL;
  271.         lock = false;
  272.     } else {
  273.         as = AS;
  274.         lock = true;
  275.     }
  276.    
  277.     if (n == VECTOR_DATA_STORAGE) {
  278.         asm volatile (
  279.             "mfdar %0\n"
  280.             : "=r" (badvaddr)
  281.         );
  282.     } else
  283.         badvaddr = istate->pc;
  284.        
  285.     page_table_lock(as, lock);
  286.    
  287.     pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfrc);
  288.     if (!pte) {
  289.         switch (pfrc) {
  290.             case AS_PF_FAULT:
  291.                 goto fail;
  292.                 break;
  293.             case AS_PF_DEFER:
  294.                 /*
  295.                  * The page fault came during copy_from_uspace()
  296.                  * or copy_to_uspace().
  297.                  */
  298.                 page_table_unlock(as, lock);
  299.                 return;
  300.             default:
  301.                 panic("Unexpected pfrc (%d)\n", pfrc);
  302.         }
  303.     }
  304.    
  305.     pte->a = 1; /* Record access to PTE */
  306.     pht_insert(badvaddr, pte->pfn);
  307.    
  308.     page_table_unlock(as, lock);
  309.     return;
  310.    
  311. fail:
  312.     page_table_unlock(as, lock);
  313.     pht_refill_fail(badvaddr, istate);
  314. }
  315.  
  316.  
  317. /** Process Instruction/Data Storage Interrupt in Real Mode
  318.  *
  319.  * @param n Interrupt vector number.
  320.  * @param istate Interrupted register context.
  321.  *
  322.  */
  323. bool pht_real_refill(int n, istate_t *istate)
  324. {
  325.     uintptr_t badvaddr;
  326.    
  327.     if (n == VECTOR_DATA_STORAGE) {
  328.         asm volatile (
  329.             "mfdar %0\n"
  330.             : "=r" (badvaddr)
  331.         );
  332.     } else
  333.         badvaddr = istate->pc;
  334.    
  335.     uint32_t physmem;
  336.     asm volatile (
  337.         "mfsprg3 %0\n"
  338.         : "=r" (physmem)
  339.     );
  340.    
  341.     if ((badvaddr >= PA2KA(0)) && (badvaddr < PA2KA(physmem))) {
  342.         pht_real_insert(badvaddr, KA2PA(badvaddr) >> 12);
  343.         return true;
  344.     }
  345.    
  346.     return false;
  347. }
  348.  
  349.  
  350. void tlb_arch_init(void)
  351. {
  352.     tlb_invalidate_all();
  353. }
  354.  
  355.  
  356. void tlb_invalidate_all(void)
  357. {
  358.     asm volatile (
  359.         "tlbia\n"
  360.         "tlbsync\n"
  361.     );
  362. }
  363.  
  364.  
  365. void tlb_invalidate_asid(asid_t asid)
  366. {
  367.     uint32_t sdr1;
  368.     asm volatile (
  369.         "mfsdr1 %0\n"
  370.         : "=r" (sdr1)
  371.     );
  372.     phte_t *phte = (phte_t *) PA2KA(sdr1 & 0xffff0000);
  373.    
  374.     uint32_t i;
  375.     for (i = 0; i < 8192; i++) {
  376.         if ((phte[i].v) && (phte[i].vsid >= (asid << 4)) && (phte[i].vsid < ((asid << 4) + 16)))
  377.             phte[i].v = 0;
  378.     }
  379.     tlb_invalidate_all();
  380. }
  381.  
  382.  
  383. void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)
  384. {
  385.     // TODO
  386.     tlb_invalidate_all();
  387. }
  388.  
  389.  
  390. #define PRINT_BAT(name, ureg, lreg) \
  391.     asm volatile ( \
  392.         "mfspr %0," #ureg "\n" \
  393.         "mfspr %1," #lreg "\n" \
  394.         : "=r" (upper), "=r" (lower) \
  395.     ); \
  396.     mask = (upper & 0x1ffc) >> 2; \
  397.     if (upper & 3) { \
  398.         uint32_t tmp = mask; \
  399.         length = 128; \
  400.         while (tmp) { \
  401.             if ((tmp & 1) == 0) { \
  402.                 printf("ibat[0]: error in mask\n"); \
  403.                 break; \
  404.             } \
  405.             length <<= 1; \
  406.             tmp >>= 1; \
  407.         } \
  408.     } else \
  409.         length = 0; \
  410.     printf(name ": page=%.*p frame=%.*p length=%d KB (mask=%#x)%s%s\n", sizeof(upper) * 2, upper & 0xffff0000, sizeof(lower) * 2, lower & 0xffff0000, length, mask, ((upper >> 1) & 1) ? " supervisor" : "", (upper & 1) ? " user" : "");
  411.  
  412.  
  413. void tlb_print(void)
  414. {
  415.     uint32_t sr;
  416.    
  417.     for (sr = 0; sr < 16; sr++) {
  418.         uint32_t vsid;
  419.         asm volatile (
  420.             "mfsrin %0, %1\n"
  421.             : "=r" (vsid)
  422.             : "r" (sr << 28)
  423.         );
  424.         printf("vsid[%d]: VSID=%.*p (ASID=%d)%s%s\n", sr, sizeof(vsid) * 2, vsid & 0xffffff, (vsid & 0xffffff) >> 4, ((vsid >> 30) & 1) ? " supervisor" : "", ((vsid >> 29) & 1) ? " user" : "");
  425.     }
  426.    
  427.     uint32_t upper;
  428.     uint32_t lower;
  429.     uint32_t mask;
  430.     uint32_t length;
  431.    
  432.     PRINT_BAT("ibat[0]", 528, 529);
  433.     PRINT_BAT("ibat[1]", 530, 531);
  434.     PRINT_BAT("ibat[2]", 532, 533);
  435.     PRINT_BAT("ibat[3]", 534, 535);
  436.    
  437.     PRINT_BAT("dbat[0]", 536, 537);
  438.     PRINT_BAT("dbat[1]", 538, 539);
  439.     PRINT_BAT("dbat[2]", 540, 541);
  440.     PRINT_BAT("dbat[3]", 542, 543);
  441. }
  442.  
  443. /** @}
  444.  */
  445.