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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-03-16 15:52:58 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-03-16 15:52:58 +0000 |
commit | ea4c23ad866e7a548c9e8c086a573c7109e02c87 (patch) | |
tree | 52f926a8e9ae4ddd04a7f7ce126413ca3e48a1d8 /nuttx/arch/dm320/src/up_initialstate.c | |
parent | b1f396b003b38638bbf3a1a1946b6068ea768ca5 (diff) | |
download | px4-nuttx-ea4c23ad866e7a548c9e8c086a573c7109e02c87.tar.gz px4-nuttx-ea4c23ad866e7a548c9e8c086a573c7109e02c87.tar.bz2 px4-nuttx-ea4c23ad866e7a548c9e8c086a573c7109e02c87.zip |
Initial version
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@68 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/dm320/src/up_initialstate.c')
-rw-r--r-- | nuttx/arch/dm320/src/up_initialstate.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/nuttx/arch/dm320/src/up_initialstate.c b/nuttx/arch/dm320/src/up_initialstate.c new file mode 100644 index 000000000..312748795 --- /dev/null +++ b/nuttx/arch/dm320/src/up_initialstate.c @@ -0,0 +1,91 @@ +/************************************************************ + * up_initialstate.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name Gregory Nutt nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************/ + +/************************************************************ + * Included Files + ************************************************************/ + +#include <nuttx/config.h> +#include <sys/types.h> +#include <string.h> +#include <nuttx/arch.h> +#include "up_internal.h" +#include "dm320.h" + +/************************************************************ + * Private Definitions + ************************************************************/ + +/************************************************************ + * Private Data + ************************************************************/ + +/************************************************************ + * Private Funtions + ************************************************************/ + +/************************************************************ + * Public Funtions + ************************************************************/ + +/************************************************************ + * Name: up_initial_state + * + * Description: + * A new thread is being started and a new TCB + * has been created. This function is called to initialize + * the processor specific portions of the new TCB. + * + * This function must setup the intial architecture registers + * and/or stack so that execution will begin at tcb->start + * on the next context switch. + * + ************************************************************/ + +void up_initial_state(_TCB *tcb) +{ + struct xcptcontext *xcp = &tcb->xcp; + + /* Initialize the initial exception register context structure */ + + memset(xcp, 0, sizeof(struct xcptcontext)); + xcp->regs[REG_SP] = (uint32)tcb->adj_stack_ptr; + xcp->regs[REG_PC] = (uint32)tcb->start; +#ifdef CONFIG_SUPPRESS_INTERRUPTS + xcp->regs[REG_CPSR] = SVC_MODE | PSR_I_BIT | PSR_F_BIT; +#else + xcp->regs[REG_CPSR] = SVC_MODE | PSR_F_BIT; +#endif +} |