85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
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/*
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* Copyright (c) 2011 Aeroflex Gaisler
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*
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* BSD license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <asm-leon/contextswitch.h>
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#include <asm-leon/leonbare_kernel.h>
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#include <asm-leon/leonbare_debug.h>
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#include <asm-leon/stack.h>
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#include <asm-leon/leonstack.h>
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#include <asm-leon/irq.h>
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unsigned int
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reschedule ()
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{
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leonbare_sched_update ();
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return leonbare_sched ();
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}
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unsigned int
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leonbare_sched ()
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{
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unsigned int ret = 0;
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volatile leonbare_thread_t old = LEONBARE_KR_CURRENT, new =
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LEONBARE_KR_NEXT;
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LBDEBUG_FNCALL;
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LBDEBUG_HEADER_PRINTF (LBDEBUG_SCHED_NR, "switch %s[%x]->%s[%x]\n",
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LEONBARE_TH_NAME_DBG (old), old,
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LEONBARE_TH_NAME_DBG (new), new);
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LBPASSERT ((old != new),
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"leonbare_sched should only be called with reschedule work to do",
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0);
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LEONBARE_KR_CURRENT = new;
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/* to be able to programm symetrically on kernel level each thread
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saves it's spinlock on mutexes and kernel and irq flags in its
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own save region. On a kernel switch they are released until the
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thread is reawakened. Then the locks will be reaquired (and finally
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released when the codeblock exits). The locking can be recursive. */
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if (old->th_prot.krp_k_depth)
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{
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LEONBARE_SMP_SPINLOCK_RELEASE (LEONBARE_KR_LOCK);
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}
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if (old->th_prot.krp_m_depth)
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{
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LEONBARE_SMP_SPINLOCK_RELEASE (old->th_prot.krp_m);
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}
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ret = _leonbare_kernel_switchto (old, new);
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optbarrier ();
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if (new->th_prot.krp_m_depth)
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{
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LEONBARE_SMP_SPINLOCK_AQUIRE (new->th_prot.krp_m);
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}
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if (old->th_prot.krp_k_depth)
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{
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LEONBARE_SMP_SPINLOCK_AQUIRE (LEONBARE_KR_LOCK);
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}
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return ret;
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}
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