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  1. /*
  2.  * Copyright (C) 2005 Ondrej Palkovsky
  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. #include <proc/scheduler.h>
  30. #include <cpu.h>
  31. #include <proc/thread.h>
  32. #include <arch.h>
  33. #include <arch/context.h>   /* SP_DELTA */
  34. #include <arch/asm.h>
  35. #include <arch/debugger.h>
  36.  
  37. void before_thread_runs_arch(void)
  38. {
  39.     CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  40.  
  41.     /* Syscall support - write thread stack address to hidden part of gs */
  42.     swapgs();
  43.     write_msr(AMD_MSR_GS,
  44.           (__u64)&THREAD->kstack);
  45.     swapgs();
  46.  
  47.  
  48. #ifdef CONFIG_DEBUG_AS_WATCHPOINT
  49.     /* Set watchpoint on AS to ensure that nobody sets it to zero */
  50.     static int old_slot = -1;
  51.     if (old_slot >=0)
  52.         breakpoint_del(old_slot);
  53.     old_slot = breakpoint_add(&((the_t *) THREAD->kstack)->as,
  54.                   BKPOINT_WRITE | BKPOINT_CHECK_ZERO);
  55. #endif
  56. }
  57.  
  58. void after_thread_ran_arch(void)
  59. {
  60. }
  61.