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