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901 jermar 1 
/*
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 * Copyright (C) 2006 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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#include <proc/scheduler.h>
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#include <proc/thread.h>
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#include <arch.h>
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#include <arch/register.h>
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#include <arch/context.h>
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#include <arch/stack.h>
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#include <arch/mm/tlb.h>
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#include <config.h>
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#include <align.h>
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/** Perform ia64 specific tasks needed before the new task is run. */
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void before_task_runs_arch(void)
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{
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}
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/** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */
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void before_thread_runs_arch(void)
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{
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    __address base;
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    base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
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    if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<(KERNEL_PAGE_WIDTH))) {
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        /*
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         * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
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         * Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it.
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         */
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        /* purge DTR[TR_STACK1] and DTR[TR_STACK2] */
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        dtr_purge((__address) THREAD->kstack, PAGE_WIDTH+1);
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        /* insert DTR[TR_STACK1] and DTR[TR_STACK2] */
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        dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK1);
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        dtlb_kernel_mapping_insert((__address) THREAD->kstack + PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true, DTR_KSTACK2);
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    }
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    /*
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     * Record address of kernel backing store to bank 0 r22.
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     * Record address of kernel stack to bank 0 r23.
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     * These values will be found there after switch from userspace.
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     */
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    __asm__ volatile (
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        "bsw.0\n"
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        "mov r22 = %0\n"
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        "mov r23 = %1\n"
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        "bsw.1\n"
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        :
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        : "r" (&THREAD->kstack[THREAD_STACK_SIZE]),
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          "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])
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        );
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}
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void after_thread_ran_arch(void)
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{
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}