1 | /* |
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2 | * hal_switch.h - TSAR architecture context switch function |
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3 | * |
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4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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6 | * |
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7 | * This file is part of ALMOS-kernel. |
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8 | * |
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9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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10 | * under the terms of the GNU General Public License as published by |
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11 | * the Free Software Foundation; version 2.0 of the License. |
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12 | * |
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13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |
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23 | #ifndef _HAL_SWITCH_H_ |
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24 | #define _HAL_SWITCH_H_ |
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25 | |
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26 | /************************************************************************************* |
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27 | * The hal_do_switch() function is an assembly level code called by the |
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28 | * hal_cpu_context_switch() function to make the actual context swich. |
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29 | * The hal_cpu_context_t structure used to store a core context is defined |
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30 | * in the TSAR specific hal_context.c file. |
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31 | * The following core registers are saved in the old context & and restored |
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32 | * from the new context: |
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33 | * - GPR : all, but (zero, k0, k1), plus (hi, lo) |
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34 | * - CP0 : c0_th , c0_sr |
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35 | * - CP2 : c2_ptpr , C2_mode, C2_epc |
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36 | * When the switch is completed, it jumps to address contained in register $31 |
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37 | * of the new context. |
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38 | ************************************************************************************* |
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39 | * @ ctx_old : local pointer on the old thread context. |
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40 | * @ ctx_new : local pointer on the new thread context. |
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41 | ************************************************************************************/ |
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42 | void hal_do_switch( void * ctx_old, |
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43 | void * ctx_new ); |
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44 | |
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45 | |
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46 | #endif /* _HAL_SWITCH_H_ */ |
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