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* Copyright (c) 2005 Jakub Jermar
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** @addtogroup ia32proc
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#include <proc/scheduler.h>
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#include <proc/task.h>
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#include <proc/thread.h>
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#include <arch/context.h> /* SP_DELTA */
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#include <arch/ddi/ddi.h>
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/** Perform ia32 specific tasks needed before the new task is run.
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* Interrupts are disabled.
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void before_task_runs_arch(void)
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io_perm_bitmap_install();
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/** Perform ia32 specific tasks needed before the new thread is scheduled.
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* THREAD is locked and interrupts are disabled.
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void before_thread_runs_arch(void)
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uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
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/* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */
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write_msr(IA32_MSR_SYSENTER_ESP, kstk);
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/* Set kernel stack for CPL3 -> CPL0 switch via interrupt */
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CPU->arch.tss->esp0 = kstk;
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CPU->arch.tss->ss0 = gdtselector(KDATA_DES);
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/* Set up TLS in GS register */
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set_tls_desc(THREAD->arch.tls);
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void after_thread_ran_arch(void)