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897 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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1705 cejka 29 
 /** @addtogroup sparc64proc
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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 <proc/thread.h>
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#include <arch.h>
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#include <arch/mm/tlb.h>
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#include <arch/mm/page.h>
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#include <config.h>
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#include <align.h>
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/** Perform sparc64 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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/** Ensure that thread's kernel stack is locked in TLB. */
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void before_thread_runs_arch(void)
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{
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    uintptr_t base;
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    base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
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    if ((uintptr_t) THREAD->kstack < base || (uintptr_t) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
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        /*
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         * Kernel stack of this thread is not locked in DTLB.
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         * First, make sure it is not mapped already.
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         * If not, create a locked mapping for it.
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         */
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         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
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         dtlb_insert_mapping((uintptr_t) THREAD->kstack, KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
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    }  
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}
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/** Unlock thread's stack from TLB, if necessary. */
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void after_thread_ran_arch(void)
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{
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    uintptr_t base;
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    base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
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    if ((uintptr_t) THREAD->kstack < base || (uintptr_t) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
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        /*
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         * Kernel stack of this thread is locked in DTLB.
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         * Destroy the mapping.
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         */
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        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) THREAD->kstack);
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    }
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}
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 /** @}
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 */
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