[444] | 1 | /* |
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| 2 | * Copyright (c) 2011 Aeroflex Gaisler |
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| 3 | * |
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| 4 | * BSD license: |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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| 7 | * of this software and associated documentation files (the "Software"), to deal |
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| 8 | * in the Software without restriction, including without limitation the rights |
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| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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| 10 | * copies of the Software, and to permit persons to whom the Software is |
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| 11 | * furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included in |
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| 14 | * all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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| 22 | * THE SOFTWARE. |
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| 23 | */ |
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| 24 | |
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| 25 | |
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| 26 | #include <asm-leon/contextswitch.h> |
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| 27 | #include <asm-leon/leonbare_kernel.h> |
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| 28 | #include <asm-leon/leonbare_debug.h> |
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| 29 | #include <asm-leon/stack.h> |
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| 30 | #include <asm-leon/leonstack.h> |
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| 31 | #include <asm-leon/irq.h> |
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| 32 | |
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| 33 | unsigned int |
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| 34 | reschedule () |
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| 35 | { |
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| 36 | leonbare_sched_update (); |
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| 37 | return leonbare_sched (); |
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| 38 | } |
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| 39 | |
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| 40 | unsigned int |
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| 41 | leonbare_sched () |
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| 42 | { |
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| 43 | unsigned int ret = 0; |
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| 44 | volatile leonbare_thread_t old = LEONBARE_KR_CURRENT, new = |
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| 45 | LEONBARE_KR_NEXT; |
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| 46 | LBDEBUG_FNCALL; |
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| 47 | LBDEBUG_HEADER_PRINTF (LBDEBUG_SCHED_NR, "switch %s[%x]->%s[%x]\n", |
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| 48 | LEONBARE_TH_NAME_DBG (old), old, |
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| 49 | LEONBARE_TH_NAME_DBG (new), new); |
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| 50 | |
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| 51 | LBPASSERT ((old != new), |
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| 52 | "leonbare_sched should only be called with reschedule work to do", |
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| 53 | 0); |
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| 54 | |
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| 55 | LEONBARE_KR_CURRENT = new; |
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| 56 | |
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| 57 | /* to be able to programm symetrically on kernel level each thread |
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| 58 | saves it's spinlock on mutexes and kernel and irq flags in its |
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| 59 | own save region. On a kernel switch they are released until the |
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| 60 | thread is reawakened. Then the locks will be reaquired (and finally |
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| 61 | released when the codeblock exits). The locking can be recursive. */ |
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| 62 | if (old->th_prot.krp_k_depth) |
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| 63 | { |
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| 64 | LEONBARE_SMP_SPINLOCK_RELEASE (LEONBARE_KR_LOCK); |
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| 65 | } |
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| 66 | if (old->th_prot.krp_m_depth) |
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| 67 | { |
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| 68 | LEONBARE_SMP_SPINLOCK_RELEASE (old->th_prot.krp_m); |
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| 69 | } |
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| 70 | |
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| 71 | ret = _leonbare_kernel_switchto (old, new); |
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| 72 | optbarrier (); |
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| 73 | |
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| 74 | if (new->th_prot.krp_m_depth) |
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| 75 | { |
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| 76 | LEONBARE_SMP_SPINLOCK_AQUIRE (new->th_prot.krp_m); |
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| 77 | } |
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| 78 | if (old->th_prot.krp_k_depth) |
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| 79 | { |
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| 80 | LEONBARE_SMP_SPINLOCK_AQUIRE (LEONBARE_KR_LOCK); |
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| 81 | } |
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| 82 | |
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| 83 | return ret; |
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| 84 | } |
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