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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * Copyright (c) 2009 Pavel Rimsky
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup sparc64proc
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <proc/scheduler.h>
  37. #include <proc/thread.h>
  38. #include <arch.h>
  39. #include <arch/asm.h>
  40. #include <arch/stack.h>
  41. #include <arch/sun4v/cpu.h>
  42. #include <arch/sun4v/hypercall.h>
  43.  
  44. extern kstack_wbuf_ptr kstack_wbuf_ptrs[MAX_NUM_STRANDS];
  45.  
  46. /** Perform sparc64 specific tasks needed before the new task is run. */
  47. void before_task_runs_arch(void)
  48. {
  49. }
  50.  
  51. /** Perform sparc64 specific steps before scheduling a thread.
  52.  *
  53.  * For userspace threads, initialize pointer to the kernel stack and for the
  54.  * userspace window buffer.
  55.  */
  56. void before_thread_runs_arch(void)
  57. {
  58.     if ((THREAD->flags & THREAD_FLAG_USPACE)) {
  59.         uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE -
  60.             (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
  61.         int cpuid = asi_u64_read(ASI_SCRATCHPAD, SCRATCHPAD_CPUID);
  62.         kstack_wbuf_ptrs[cpuid].kstack = sp;
  63.         kstack_wbuf_ptrs[cpuid].wbuf =
  64.             (uintptr_t) THREAD->arch.uspace_window_buffer;
  65.     }
  66. }
  67.  
  68. /** Perform sparc64 specific steps before a thread stops running. */
  69. void after_thread_ran_arch(void)
  70. {
  71.     if ((THREAD->flags & THREAD_FLAG_USPACE)) {
  72.         /* sample the state of the userspace window buffer */  
  73.         int cpuid = asi_u64_read(ASI_SCRATCHPAD, SCRATCHPAD_CPUID);
  74.         THREAD->arch.uspace_window_buffer =
  75.             (uint8_t *) kstack_wbuf_ptrs[cpuid].wbuf;
  76.     }
  77. }
  78.  
  79. /** @}
  80.  */
  81.