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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 897 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <proc/scheduler.h> |
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| 30 | #include <proc/thread.h> |
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| 31 | #include <arch.h> |
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| 32 | #include <arch/mm/tlb.h> |
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| 33 | #include <config.h> |
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| 34 | #include <align.h> |
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| 35 | |||
| 36 | /** Ensure that thread's kernel stack is locked in TLB. */ |
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| 37 | void before_thread_runs_arch(void) |
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| 38 | { |
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| 39 | __address base; |
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| 40 | |||
| 41 | base = ALIGN_DOWN(config.base, 4*1024*1024); |
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| 42 | |||
| 43 | if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + 4*1024*1024) { |
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| 44 | /* |
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| 45 | * Kernel stack of this thread is not locked in DTLB. |
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| 46 | * First, make sure it is not mapped already. |
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| 47 | * If not, create a locked mapping for it. |
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| 48 | */ |
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| 49 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack); |
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| 50 | dtlb_insert_mapping((__address) THREAD->kstack, (__address) THREAD->kstack, PAGESIZE_8K, true, true); |
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| 51 | } |
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| 52 | } |
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| 53 | |||
| 54 | /** Unlock thread's stack from TLB, if necessary. */ |
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| 55 | void after_thread_ran_arch(void) |
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| 56 | { |
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| 57 | __address base; |
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| 58 | |||
| 59 | base = ALIGN_DOWN(config.base, 4*1024*1024); |
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| 60 | |||
| 61 | if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + 4*1024*1024) { |
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| 62 | /* |
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| 63 | * Kernel stack of this thread is locked in DTLB. |
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| 64 | * Destroy the mapping. |
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| 65 | */ |
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| 66 | dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack); |
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| 67 | } |
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| 68 | } |