diff options
Diffstat (limited to 'nuttx/arch/z16/src/common/up_createstack.c')
-rw-r--r-- | nuttx/arch/z16/src/common/up_createstack.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/nuttx/arch/z16/src/common/up_createstack.c b/nuttx/arch/z16/src/common/up_createstack.c new file mode 100644 index 000000000..7528b0af2 --- /dev/null +++ b/nuttx/arch/z16/src/common/up_createstack.c @@ -0,0 +1,128 @@ +/**************************************************************************** + * common/up_createstack.c + * + * Copyright (C) 2008 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 NuttX 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 <sched.h> +#include <debug.h> +#include <nuttx/kmalloc.h> +#include <nuttx/arch.h> +#include "up_arch.h" +#include "up_internal.h" + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * 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 stack_alloc_ptr 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, size_t stack_size) +{ + if (tcb->stack_alloc_ptr && + tcb->adj_stack_size != stack_size) + { + sched_free(tcb->stack_alloc_ptr); + tcb->stack_alloc_ptr = NULL; + } + + if (!tcb->stack_alloc_ptr) + { + tcb->stack_alloc_ptr = (uint32 *)kzmalloc(stack_size); + } + + if (tcb->stack_alloc_ptr) + { + size_t top_of_stack; + size_t size_of_stack; + + /* The Arm7Tdmi uses a push-down stack: the stack grows + * toward loweraddresses in memory. The stack pointer + * register, points to the lowest, valid work address + * (the "top" of the stack). Items on the stack are + * referenced as positive word offsets from sp. + */ + + top_of_stack = (uint32)tcb->stack_alloc_ptr + stack_size - 4; + + /* The Arm7Tdmi stack must be aligned at word (4 byte) + * boundaries. If necessary top_of_stack must be rounded + * down to the next boundary + */ + + top_of_stack &= ~3; + size_of_stack = top_of_stack - (uint32)tcb->stack_alloc_ptr + 4; + + /* Save the adjusted stack values in the _TCB */ + + tcb->adj_stack_ptr = (uint32*)top_of_stack; + tcb->adj_stack_size = size_of_stack; + + up_ledon(LED_STACKCREATED); + return OK; + } + + return ERROR; +} |