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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  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 sparc64mm  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/mm/tsb.h>
  36. #include <arch/mm/tlb.h>
  37. #include <arch/mm/page.h>
  38. #include <arch/barrier.h>
  39. #include <mm/as.h>
  40. #include <arch/types.h>
  41. #include <macros.h>
  42. #include <debug.h>
  43.  
  44. #define TSB_INDEX_MASK  ((1 << (21 + 1 + TSB_SIZE - MMU_PAGE_WIDTH)) - 1)
  45.  
  46. /** Invalidate portion of TSB.
  47.  *
  48.  * We assume that the address space is already locked. Note that respective
  49.  * portions of both TSBs are invalidated at a time.
  50.  *
  51.  * @param as Address space.
  52.  * @param page First page to invalidate in TSB.
  53.  * @param pages Number of pages to invalidate. Value of (count_t) -1 means the
  54.  *  whole TSB.
  55.  */
  56. void tsb_invalidate(as_t *as, uintptr_t page, count_t pages)
  57. {
  58.     index_t i0, i;
  59.     count_t cnt;
  60.    
  61.     ASSERT(as->arch.itsb && as->arch.dtsb);
  62.    
  63.     i0 = (page >> MMU_PAGE_WIDTH) & TSB_INDEX_MASK;
  64.     ASSERT(i0 < ITSB_ENTRY_COUNT && i0 < DTSB_ENTRY_COUNT);
  65.  
  66.     if (pages == (count_t) -1 || (pages * 2) > ITSB_ENTRY_COUNT)
  67.         cnt = ITSB_ENTRY_COUNT;
  68.     else
  69.         cnt = pages * 2;
  70.    
  71.     for (i = 0; i < cnt; i++) {
  72.         as->arch.itsb[(i0 + i) & (ITSB_ENTRY_COUNT - 1)].tag.invalid =
  73.             true;
  74.         as->arch.dtsb[(i0 + i) & (DTSB_ENTRY_COUNT - 1)].tag.invalid =
  75.             true;
  76.     }
  77. }
  78.  
  79. /** Copy software PTE to ITSB.
  80.  *
  81.  * @param t     Software PTE.
  82.  * @param index Zero if lower 8K-subpage, one if higher 8K subpage.
  83.  */
  84. void itsb_pte_copy(pte_t *t, index_t index)
  85. {
  86.     as_t *as;
  87.     tsb_entry_t *tsb;
  88.     index_t entry;
  89.  
  90.     ASSERT(index <= 1);
  91.    
  92.     as = t->as;
  93.     entry = ((t->page >> MMU_PAGE_WIDTH) + index) & TSB_INDEX_MASK;
  94.     ASSERT(entry < ITSB_ENTRY_COUNT);
  95.     tsb = &as->arch.itsb[entry];
  96.  
  97.     /*
  98.      * We use write barriers to make sure that the TSB load
  99.      * won't use inconsistent data or that the fault will
  100.      * be repeated.
  101.      */
  102.  
  103.     tsb->tag.invalid = true;    /* invalidate the entry
  104.                      * (tag target has this
  105.                      * set to 0) */
  106.  
  107.     write_barrier();
  108.  
  109.     tsb->tag.context = as->asid;
  110.     /* the shift is bigger than PAGE_WIDTH, do not bother with index  */
  111.     tsb->tag.va_tag = t->page >> VA_TAG_PAGE_SHIFT;
  112.     tsb->data.value = 0;
  113.     tsb->data.size = PAGESIZE_8K;
  114.     tsb->data.pfn = (t->frame >> MMU_FRAME_WIDTH) + index;
  115.     tsb->data.cp = t->c;
  116.     tsb->data.p = t->k;     /* p as privileged */
  117.     tsb->data.v = t->p;
  118.    
  119.     write_barrier();
  120.    
  121.     tsb->tag.invalid = false;   /* mark the entry as valid */
  122. }
  123.  
  124. /** Copy software PTE to DTSB.
  125.  *
  126.  * @param t Software PTE.
  127.  * @param index Zero if lower 8K-subpage, one if higher 8K-subpage.
  128.  * @param ro    If true, the mapping is copied read-only.
  129.  */
  130. void dtsb_pte_copy(pte_t *t, index_t index, bool ro)
  131. {
  132.     as_t *as;
  133.     tsb_entry_t *tsb;
  134.     index_t entry;
  135.    
  136.     ASSERT(index <= 1);
  137.  
  138.     as = t->as;
  139.     entry = ((t->page >> MMU_PAGE_WIDTH) + index) & TSB_INDEX_MASK;
  140.     ASSERT(entry < DTSB_ENTRY_COUNT);
  141.     tsb = &as->arch.dtsb[entry];
  142.  
  143.     /*
  144.      * We use write barriers to make sure that the TSB load
  145.      * won't use inconsistent data or that the fault will
  146.      * be repeated.
  147.      */
  148.  
  149.     tsb->tag.invalid = true;    /* invalidate the entry
  150.                      * (tag target has this
  151.                      * set to 0) */
  152.  
  153.     write_barrier();
  154.  
  155.     tsb->tag.context = as->asid;
  156.     /* the shift is bigger than PAGE_WIDTH, do not bother with index */
  157.     tsb->tag.va_tag = t->page >> VA_TAG_PAGE_SHIFT;
  158.     tsb->data.value = 0;
  159.     tsb->data.size = PAGESIZE_8K;
  160.     tsb->data.pfn = (t->frame >> MMU_FRAME_WIDTH) + index;
  161.     tsb->data.cp = t->c;
  162. #ifdef CONFIG_VIRT_IDX_DCACHE
  163.     tsb->data.cv = t->c;
  164. #endif /* CONFIG_VIRT_IDX_DCACHE */
  165.     tsb->data.p = t->k;     /* p as privileged */
  166.     tsb->data.w = ro ? false : t->w;
  167.     tsb->data.v = t->p;
  168.    
  169.     write_barrier();
  170.    
  171.     tsb->tag.invalid = false;   /* mark the entry as valid */
  172. }
  173.  
  174. /** @}
  175.  */
  176.