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/*
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 * Copyright (c) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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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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 * are met:
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 *
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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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 *
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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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 */
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/** @addtogroup ia32proc
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 * @{
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 */
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/** @file
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 */
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#include <proc/scheduler.h>
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#include <cpu.h>
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#include <proc/task.h>
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#include <proc/thread.h>
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#include <arch.h>
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#include <arch/context.h>   /* SP_DELTA */
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#include <arch/debugger.h>
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#include <arch/pm.h>
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#include <arch/asm.h>
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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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 *
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 * Interrupts are disabled.
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 */
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void before_task_runs_arch(void)
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{
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    io_perm_bitmap_install();
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}
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/** Perform ia32 specific tasks needed before the new thread is scheduled.
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 *
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 * THREAD is locked and interrupts are disabled.
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 */
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void before_thread_runs_arch(void)
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{
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    uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
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        SP_DELTA];
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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 = selector(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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#ifdef CONFIG_DEBUG_AS_WATCHPOINT
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    /* Set watchpoint on AS to ensure that nobody sets it to zero */
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    if (CPU->id < BKPOINTS_MAX) {
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        the_t *the = THE;
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        breakpoint_add(&((the_t *) the->thread->kstack)->as,
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            BKPOINT_WRITE | BKPOINT_CHECK_ZERO, the->cpu->id);
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    }
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#endif
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}
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void after_thread_ran_arch(void)
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{
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}
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/** @}
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 */