diff options
Diffstat (limited to 'libgloss/sparc_leon/kernel_sched.c')
-rw-r--r-- | libgloss/sparc_leon/kernel_sched.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/kernel_sched.c b/libgloss/sparc_leon/kernel_sched.c new file mode 100644 index 000000000..2b485c0fe --- /dev/null +++ b/libgloss/sparc_leon/kernel_sched.c @@ -0,0 +1,84 @@ +/* + * 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; +} |