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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 sparc64proc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <proc/scheduler.h>
  36. #include <proc/thread.h>
  37. #include <arch.h>
  38. #include <arch/asm.h>
  39. #include <arch/mm/tlb.h>
  40. #include <arch/mm/page.h>
  41. #include <config.h>
  42. #include <align.h>
  43. #include <macros.h>
  44.  
  45. /** Perform sparc64 specific tasks needed before the new task is run. */
  46. void before_task_runs_arch(void)
  47. {
  48. }
  49.  
  50. /** Perform sparc64 specific steps before scheduling a thread.
  51.  *
  52.  * Ensure that thread's kernel stack, as well as userspace window
  53.  * buffer for userspace threads, are locked in DTLB.
  54.  */
  55. void before_thread_runs_arch(void)
  56. {
  57.     uintptr_t base;
  58.    
  59.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  60.  
  61.     if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) {
  62.         /*
  63.          * Kernel stack of this thread is not locked in DTLB.
  64.          * First, make sure it is not mapped already.
  65.          * If not, create a locked mapping for it.
  66.          */
  67.         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
  68.         dtlb_insert_mapping((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
  69.     }
  70.    
  71.     if ((THREAD->flags & THREAD_FLAG_USPACE)) {
  72.         /*
  73.          * If this thread executes also in userspace, we have to lock
  74.          * its userspace window buffer into DTLB.
  75.          */
  76.         ASSERT(THREAD->arch.uspace_window_buffer);
  77.         uintptr_t uw_buf = (uintptr_t) THREAD->arch.uspace_window_buffer;
  78.         if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
  79.             /*
  80.              * The buffer is not covered by the 4M locked kernel DTLB entry.
  81.              */
  82.             dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) uw_buf);
  83.             dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true);
  84.         }
  85.     }
  86. }
  87.  
  88. /** Perform sparc64 specific steps before a thread stops running.
  89.  *
  90.  * Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack
  91.  * and userspace window buffer).
  92.  */
  93. void after_thread_ran_arch(void)
  94. {
  95.     uintptr_t base;
  96.  
  97.     base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
  98.  
  99.     if (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1<<KERNEL_PAGE_WIDTH))) {
  100.         /*
  101.          * Kernel stack of this thread is locked in DTLB.
  102.          * Destroy the mapping.
  103.          */
  104.         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
  105.     }
  106.    
  107.     if ((THREAD->flags & THREAD_FLAG_USPACE)) {
  108.         /*
  109.          * If this thread executes also in userspace, we have to force all
  110.          * its still-active userspace windows into the userspace window buffer
  111.          * and demap the buffer from DTLB.
  112.          */
  113.         ASSERT(THREAD->arch.uspace_window_buffer);
  114.        
  115.         flushw();   /* force all userspace windows into memory */
  116.        
  117.         uintptr_t uw_buf = (uintptr_t) THREAD->arch.uspace_window_buffer;
  118.         if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
  119.             /*
  120.              * The buffer is not covered by the 4M locked kernel DTLB entry
  121.              * and therefore it was given a dedicated locked DTLB entry.
  122.              * Demap it.
  123.              */
  124.             dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) uw_buf);
  125.         }
  126.     }
  127. }
  128.  
  129. /** @}
  130.  */
  131.