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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/task.h>
  32. #include <proc/thread.h>
  33. #include <arch.h>
  34. #include <arch/context.h>   /* SP_DELTA */
  35. #include <arch/asm.h>
  36. #include <arch/debugger.h>
  37. #include <print.h>
  38. #include <arch/pm.h>
  39. #include <adt/bitmap.h>
  40.  
  41. /** Perform amd64 specific tasks needed before the new task is run.
  42.  *
  43.  * Interrupts are disabled.
  44.  */
  45. void before_task_runs_arch(void)
  46. {
  47.     count_t bits;
  48.     ptr_16_64_t cpugdtr;
  49.     descriptor_t *gdt_p;
  50.     tss_descriptor_t *tss_desc;
  51.  
  52.     /*
  53.      * Switch the I/O Permission Bitmap, if necessary.
  54.      */
  55.      
  56.     /* First, copy the I/O Permission Bitmap. */
  57.     spinlock_lock(&TASK->lock);
  58.     if ((bits = TASK->arch.iomap.bits)) {
  59.         bitmap_t iomap;
  60.    
  61.         ASSERT(TASK->arch.iomap.map);
  62.         bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
  63.         bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
  64.         /*
  65.          * It is safe to set the trailing eight bits because of the extra
  66.          * convenience byte in TSS_IOMAP_SIZE.
  67.          */
  68.         bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8);
  69.     }
  70.     spinlock_unlock(&TASK->lock);
  71.  
  72.     /* Second, adjust TSS segment limit. */
  73.     gdtr_store(&cpugdtr);
  74.     gdt_p = (descriptor_t *) cpugdtr.base;
  75.     gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1);
  76.     gdtr_load(&cpugdtr);
  77.    
  78.     /*
  79.          * Before we load new TSS limit, the current TSS descriptor
  80.          * type must be changed to describe inactive TSS.
  81.          */
  82.     tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES];
  83.     tss_desc->type = AR_TSS;
  84.     tr_load(gdtselector(TSS_DES));
  85. }
  86.  
  87. /** Perform amd64 specific tasks needed before the new thread is scheduled. */
  88. void before_thread_runs_arch(void)
  89. {
  90.     CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  91.  
  92.     /* Syscall support - write address of thread stack pointer to
  93.      * hidden part of gs */
  94.     swapgs();
  95.     write_msr(AMD_MSR_GS, (__u64)&THREAD->kstack);
  96.     swapgs();
  97.  
  98.     /* TLS support - set FS to thread local storage */
  99.     write_msr(AMD_MSR_FS, THREAD->arch.tls);
  100.  
  101. #ifdef CONFIG_DEBUG_AS_WATCHPOINT
  102.     /* Set watchpoint on AS to ensure that nobody sets it to zero */
  103.     if (CPU->id < BKPOINTS_MAX)
  104.         breakpoint_add(&((the_t *) THREAD->kstack)->as,
  105.                    BKPOINT_WRITE | BKPOINT_CHECK_ZERO,
  106.                    CPU->id);
  107. #endif
  108. }
  109.  
  110. void after_thread_ran_arch(void)
  111. {
  112. }
  113.