source: trunk/hal/tsar_mips32/core/hal_switch.h @ 367

Last change on this file since 367 was 367, checked in by alain, 4 years ago

Change Time unit from cycle to TICK (in millisecond).
Fix several bugs in VFS.

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