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257 palkovsky 1 
/*
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 * Copyright (C) 2005 Ondrej Palkovsky
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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 amd64proc
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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/asm.h>
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#include <arch/debugger.h>
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#include <print.h>
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#include <arch/pm.h>
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#include <arch/ddi/ddi.h>
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/** Perform amd64 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 amd64 specific tasks needed before the new thread is scheduled. */
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void before_thread_runs_arch(void)
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{
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    CPU->arch.tss->rsp0 = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
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    /* Syscall support - write address of thread stack pointer to
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     * hidden part of gs */
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    swapgs();
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    write_msr(AMD_MSR_GS, (uint64_t)&THREAD->kstack);
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    swapgs();
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    /* TLS support - set FS to thread local storage */
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    write_msr(AMD_MSR_FS, 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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        breakpoint_add(&((the_t *) THREAD->kstack)->as,
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                   BKPOINT_WRITE | BKPOINT_CHECK_ZERO,
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                   CPU->id);
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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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 */