| 0,0 → 1,68 |
|---|
| /* |
| * Copyright (C) 2006 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <proc/scheduler.h> |
| #include <proc/thread.h> |
| #include <arch.h> |
| #include <arch/mm/tlb.h> |
| #include <config.h> |
| #include <align.h> |
| |
| /** Ensure that thread's kernel stack is locked in TLB. */ |
| void before_thread_runs_arch(void) |
| { |
| __address base; |
| |
| base = ALIGN_DOWN(config.base, 4*1024*1024); |
| |
| if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + 4*1024*1024) { |
| /* |
| * Kernel stack of this thread is not locked in DTLB. |
| * First, make sure it is not mapped already. |
| * If not, create a locked mapping for it. |
| */ |
| dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack); |
| dtlb_insert_mapping((__address) THREAD->kstack, (__address) THREAD->kstack, PAGESIZE_8K, true, true); |
| } |
| } |
| |
| /** Unlock thread's stack from TLB, if necessary. */ |
| void after_thread_ran_arch(void) |
| { |
| __address base; |
| |
| base = ALIGN_DOWN(config.base, 4*1024*1024); |
| |
| if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + 4*1024*1024) { |
| /* |
| * Kernel stack of this thread is locked in DTLB. |
| * Destroy the mapping. |
| */ |
| dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (__address) THREAD->kstack); |
| } |
| } |