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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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/** @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/asm.h>
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#include <arch/regdef.h>
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#include <arch/stack.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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#include <macros.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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/** Perform sparc64 specific steps before scheduling a thread.
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 *
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 * Ensure that thread's kernel stack, as well as userspace window buffer for
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 * userspace threads, are locked in DTLB. For userspace threads, initialize
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 * reserved global registers in the alternate and interrupt sets.
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 */
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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 (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
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        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)
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            THREAD->kstack);
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        dtlb_insert_mapping((uintptr_t) THREAD->kstack,
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            KA2PA(THREAD->kstack), PAGESIZE_8K, true, true);
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    }
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    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
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        /*
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         * If this thread executes also in userspace, we have to lock
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         * its userspace window buffer into DTLB.
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         */
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        ASSERT(THREAD->arch.uspace_window_buffer);
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        uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
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            THREAD->arch.uspace_window_buffer, PAGE_SIZE);
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        if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH))
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            {
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            /*
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             * The buffer is not covered by the 4M locked kernel
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             * DTLB entry.
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             */
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            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
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            dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K,
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                true, true);
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        }
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        /*
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         * Write kernel stack address to %g6 of the alternate and
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         * interrupt global sets.
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         *
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         * Write pointer to the last item in the userspace window buffer
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         * to %g7 in the alternate set. Write to the interrupt %g7 is
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         * not necessary because:
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         * - spill traps operate only in the alternate global set,
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         * - preemptible trap handler switches to alternate globals
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         *   before it explicitly uses %g7.
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         */
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        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
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            - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
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            STACK_ALIGNMENT));
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        write_to_ig_g6(sp);
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        write_to_ag_g6(sp);
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        write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
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    }
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}
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/** Perform sparc64 specific steps before a thread stops running.
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 *
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 * Demap any locked DTLB entries installed by the thread (i.e. kernel stack
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 * and userspace window buffer).
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 */
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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 (!overlaps((uintptr_t) THREAD->kstack, PAGE_SIZE, base, (1 <<
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        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)
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            THREAD->kstack);
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    }
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    if ((THREAD->flags & THREAD_FLAG_USPACE)) {
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        /*
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         * If this thread executes also in userspace, we have to
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         * demap the userspace window buffer from DTLB.
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         */
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        ASSERT(THREAD->arch.uspace_window_buffer);
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        uintptr_t uw_buf = ALIGN_DOWN((uintptr_t)
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            THREAD->arch.uspace_window_buffer, PAGE_SIZE);
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        if (!overlaps(uw_buf, PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
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            /*
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             * The buffer is not covered by the 4M locked kernel DTLB entry
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             * and therefore it was given a dedicated locked DTLB entry.
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             * Demap it.
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             */
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            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
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        }
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        /* sample the state of the userspace window buffer */  
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        THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
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    }
897 jermar 158 
}
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/** @}
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 */