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  1. /*
  2.  * Copyright (C) 2005 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 ppc64mm   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/mm/page.h>
  36. #include <genarch/mm/page_pt.h>
  37. #include <arch/mm/frame.h>
  38. #include <arch/asm.h>
  39. #include <mm/frame.h>
  40. #include <mm/page.h>
  41. #include <mm/as.h>
  42. #include <arch.h>
  43. #include <arch/types.h>
  44. #include <arch/exception.h>
  45. #include <align.h>
  46. #include <config.h>
  47. #include <print.h>
  48. #include <symtab.h>
  49.  
  50. static phte_t *phte;
  51.  
  52.  
  53. /** Try to find PTE for faulting address
  54.  *
  55.  * Try to find PTE for faulting address.
  56.  * The as->lock must be held on entry to this function
  57.  * if lock is true.
  58.  *
  59.  * @param as       Address space.
  60.  * @param lock     Lock/unlock the address space.
  61.  * @param badvaddr Faulting virtual address.
  62.  * @param access   Access mode that caused the fault.
  63.  * @param istate   Pointer to interrupted state.
  64.  * @param pfrc     Pointer to variable where as_page_fault() return code will be stored.
  65.  * @return         PTE on success, NULL otherwise.
  66.  *
  67.  */
  68. static pte_t *find_mapping_and_check(as_t *as, bool lock, __address badvaddr, int access,
  69.                      istate_t *istate, int *pfrc)
  70. {
  71.     /*
  72.      * Check if the mapping exists in page tables.
  73.      */
  74.     pte_t *pte = page_mapping_find(as, badvaddr);
  75.     if ((pte) && (pte->p)) {
  76.         /*
  77.          * Mapping found in page tables.
  78.          * Immediately succeed.
  79.          */
  80.         return pte;
  81.     } else {
  82.         int rc;
  83.    
  84.         /*
  85.          * Mapping not found in page tables.
  86.          * Resort to higher-level page fault handler.
  87.          */
  88.         page_table_unlock(as, lock);
  89.         switch (rc = as_page_fault(badvaddr, access, istate)) {
  90.             case AS_PF_OK:
  91.                 /*
  92.                  * The higher-level page fault handler succeeded,
  93.                  * The mapping ought to be in place.
  94.                  */
  95.                 page_table_lock(as, lock);
  96.                 pte = page_mapping_find(as, badvaddr);
  97.                 ASSERT((pte) && (pte->p));
  98.                 return pte;
  99.             case AS_PF_DEFER:
  100.                 page_table_lock(as, lock);
  101.                 *pfrc = rc;
  102.                 return NULL;
  103.             case AS_PF_FAULT:
  104.                 page_table_lock(as, lock);
  105.                 printf("Page fault.\n");
  106.                 *pfrc = rc;
  107.                 return NULL;
  108.             default:
  109.                 panic("unexpected rc (%d)\n", rc);
  110.         }  
  111.     }
  112. }
  113.  
  114.  
  115. static void pht_refill_fail(__address badvaddr, istate_t *istate)
  116. {
  117.     char *symbol = "";
  118.     char *sym2 = "";
  119.  
  120.     char *s = get_symtab_entry(istate->pc);
  121.     if (s)
  122.         symbol = s;
  123.     s = get_symtab_entry(istate->lr);
  124.     if (s)
  125.         sym2 = s;
  126.     panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
  127. }
  128.  
  129.  
  130. static void pht_insert(const __address vaddr, const pfn_t pfn)
  131. {
  132.     __u32 page = (vaddr >> 12) & 0xffff;
  133.     __u32 api = (vaddr >> 22) & 0x3f;
  134.     __u32 vsid;
  135.    
  136.     asm volatile (
  137.         "mfsrin %0, %1\n"
  138.         : "=r" (vsid)
  139.         : "r" (vaddr)
  140.     );
  141.    
  142.     /* Primary hash (xor) */
  143.     __u32 h = 0;
  144.     __u32 hash = vsid ^ page;
  145.     __u32 base = (hash & 0x3ff) << 3;
  146.     __u32 i;
  147.     bool found = false;
  148.    
  149.     /* Find unused or colliding
  150.        PTE in PTEG */
  151.     for (i = 0; i < 8; i++) {
  152.         if ((!phte[base + i].v) || ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {
  153.             found = true;
  154.             break;
  155.         }
  156.     }
  157.    
  158.     if (!found) {
  159.         /* Secondary hash (not) */
  160.         __u32 base2 = (~hash & 0x3ff) << 3;
  161.        
  162.         /* Find unused or colliding
  163.            PTE in PTEG */
  164.         for (i = 0; i < 8; i++) {
  165.             if ((!phte[base2 + i].v) || ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {
  166.                 found = true;
  167.                 base = base2;
  168.                 h = 1;
  169.                 break;
  170.             }
  171.         }
  172.        
  173.         if (!found) {
  174.             // TODO: A/C precedence groups
  175.             i = page % 8;
  176.         }
  177.     }
  178.    
  179.     phte[base + i].v = 1;
  180.     phte[base + i].vsid = vsid;
  181.     phte[base + i].h = h;
  182.     phte[base + i].api = api;
  183.     phte[base + i].rpn = pfn;
  184.     phte[base + i].r = 0;
  185.     phte[base + i].c = 0;
  186.     phte[base + i].pp = 2; // FIXME
  187. }
  188.  
  189.  
  190. /** Process Instruction/Data Storage Interrupt
  191.  *
  192.  * @param data   True if Data Storage Interrupt.
  193.  * @param istate Interrupted register context.
  194.  *
  195.  */
  196. void pht_refill(bool data, istate_t *istate)
  197. {
  198.     __address badvaddr;
  199.     pte_t *pte;
  200.     int pfrc;
  201.     as_t *as;
  202.     bool lock;
  203.    
  204.     if (AS == NULL) {
  205.         as = AS_KERNEL;
  206.         lock = false;
  207.     } else {
  208.         as = AS;
  209.         lock = true;
  210.     }
  211.    
  212.     if (data) {
  213.         asm volatile (
  214.             "mfdar %0\n"
  215.             : "=r" (badvaddr)
  216.         );
  217.     } else
  218.         badvaddr = istate->pc;
  219.        
  220.     page_table_lock(as, lock);
  221.    
  222.     pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfrc);
  223.     if (!pte) {
  224.         switch (pfrc) {
  225.             case AS_PF_FAULT:
  226.                 goto fail;
  227.                 break;
  228.             case AS_PF_DEFER:
  229.                 /*
  230.                  * The page fault came during copy_from_uspace()
  231.                  * or copy_to_uspace().
  232.                  */
  233.                 page_table_unlock(as, lock);
  234.                 return;
  235.             default:
  236.                 panic("Unexpected pfrc (%d)\n", pfrc);
  237.         }
  238.     }
  239.    
  240.     pte->a = 1; /* Record access to PTE */
  241.     pht_insert(badvaddr, pte->pfn);
  242.    
  243.     page_table_unlock(as, lock);
  244.     return;
  245.    
  246. fail:
  247.     page_table_unlock(as, lock);
  248.     pht_refill_fail(badvaddr, istate);
  249. }
  250.  
  251.  
  252. void pht_init(void)
  253. {
  254.     memsetb((__address) phte, 1 << PHT_BITS, 0);
  255. }
  256.  
  257.  
  258. void page_arch_init(void)
  259. {
  260.     if (config.cpu_active == 1) {
  261.         page_mapping_operations = &pt_mapping_operations;
  262.        
  263.         __address cur;
  264.         int flags;
  265.        
  266.         /* Frames below 128 MB are mapped using BAT,
  267.            map rest of the physical memory */
  268.         for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {
  269.             flags = PAGE_CACHEABLE;
  270.             if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
  271.                 flags |= PAGE_GLOBAL;
  272.             page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
  273.         }
  274.        
  275.         /* Allocate page hash table */
  276.         phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC));
  277.         phte = (phte_t *) PA2KA((__address) physical_phte);
  278.        
  279.         ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
  280.         pht_init();
  281.        
  282.         asm volatile (
  283.             "mtsdr1 %0\n"
  284.             :
  285.             : "r" ((__address) physical_phte)
  286.         );
  287.     }
  288. }
  289.  
  290.  
  291. __address hw_map(__address physaddr, size_t size)
  292. {
  293.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
  294.         panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
  295.    
  296.     __address virtaddr = PA2KA(last_frame);
  297.     pfn_t i;
  298.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
  299.         page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
  300.    
  301.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  302.    
  303.     return virtaddr;
  304. }
  305.  
  306.  /** @}
  307.  */
  308.  
  309.