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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/stack.h>
  40.  
  41. /** Perform sparc64 specific tasks needed before the new task is run. */
  42. void before_task_runs_arch(void)
  43. {
  44. }
  45.  
  46. /** Perform sparc64 specific steps before scheduling a thread.
  47.  *
  48.  * For userspace threads, initialize reserved global registers in the alternate
  49.  * and interrupt sets.
  50.  */
  51. void before_thread_runs_arch(void)
  52. {
  53.     if ((THREAD->flags & THREAD_FLAG_USPACE)) {
  54.         /*
  55.          * Write kernel stack address to %g6 of the alternate and
  56.          * interrupt global sets.
  57.          *
  58.          * Write pointer to the last item in the userspace window buffer
  59.          * to %g7 in the alternate set. Write to the interrupt %g7 is
  60.          * not necessary because:
  61.          * - spill traps operate only in the alternate global set,
  62.          * - preemptible trap handler switches to alternate globals
  63.          *   before it explicitly uses %g7.
  64.          */
  65.         uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE -
  66.             (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
  67.         write_to_ig_g6(sp);
  68.         write_to_ag_g6(sp);
  69.         write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
  70.     }
  71. }
  72.  
  73. /** Perform sparc64 specific steps before a thread stops running. */
  74. void after_thread_ran_arch(void)
  75. {
  76.     if ((THREAD->flags & THREAD_FLAG_USPACE)) {
  77.         /* sample the state of the userspace window buffer */  
  78.         THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
  79.     }
  80. }
  81.  
  82. /** @}
  83.  */
  84.