diff options
Diffstat (limited to 'nuttx/arch/sim/src/up_createstack.c')
-rw-r--r-- | nuttx/arch/sim/src/up_createstack.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/nuttx/arch/sim/src/up_createstack.c b/nuttx/arch/sim/src/up_createstack.c new file mode 100644 index 0000000000..0e2c63e4d1 --- /dev/null +++ b/nuttx/arch/sim/src/up_createstack.c @@ -0,0 +1,109 @@ +/************************************************************ + * up_createstack.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 <nuttx/arch.h> +#include <nuttx/kmalloc.h> +#include "up_internal.h" + +/************************************************************ + * Private Definitions + ************************************************************/ + +/************************************************************ + * Private Data + ************************************************************/ + +/************************************************************ + * Private Funtions + ************************************************************/ + +/************************************************************ + * Public Funtions + ************************************************************/ + +/************************************************************ + * Name: up_create_stack + * + * Description: + * Allocate a stack for a new thread and setup + * up stack-related information in the TCB. + * + * The following TCB fields must be initialized: + * adj_stack_size: Stack size after adjustment for hardware, + * processor, etc. This value is retained only for debug + * purposes. + * stack_alloc_ptr: Pointer to allocated stack + * adj_stack_ptr: Adjusted StatckAllocPtr for HW. The + * initial value of the stack pointer. + * + * Inputs: + * tcb: The TCB of new task + * stack_size: The requested stack size. At least this much + * must be allocated. + * + ************************************************************/ + +STATUS up_create_stack(_TCB *tcb, uint32 stack_size) +{ + STATUS ret = ERROR; + + /* Move up to next even word boundary if necessary */ + + uint32 adj_stack_size = (stack_size + 3) & ~3; + uint32 adj_stack_words = adj_stack_size >> 2; + + /* Allocate the memory for the stack */ + + uint32 *stack_alloc_ptr = (uint32*)kmalloc(adj_stack_size); + if (stack_alloc_ptr) + { + /* This is the address of the last word in the allocation */ + + uint32 *adj_stack_ptr = &stack_alloc_ptr[adj_stack_words - 1]; + + /* Save the values in the TCB */ + tcb->adj_stack_size = adj_stack_size; + tcb->stack_alloc_ptr = stack_alloc_ptr; + tcb->adj_stack_ptr = adj_stack_ptr; + ret = OK; + } + return ret; +} |