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Add a up_stack_frame() interface to allocate a frame of data on a task's stack.

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5768 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2013-03-21 17:35:08 +00:00
parent cce585e320
commit 170952d6e8
23 changed files with 1554 additions and 101 deletions
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arch/rgmp/src/nuttx.c
+25
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@@ -168,6 +168,31 @@ int up_use_stack(struct tcb_s *tcb, void *stack, size_t stack_size)
return OK;
}
#ifdef CONFIG_NUTTX_KERNEL
FAR void *up_stack_frame(FAR struct tcb_s *tcb, size_t frame_size)
{
uintptr_t topaddr;
/* Align the frame_size */
frame_size = (frame_size + 3) & ~3;
/* Is there already a stack allocated? Is it big enough? */
if (!tcb->stack_alloc_ptr || tcb->adj_stack_size <= frame_size) {
return NULL;
}
/* Save the adjusted stack values in the struct tcb_s */
topaddr = (uintptr_t)tcb->adj_stack_ptr - frame_size;
tcb->adj_stack_ptr = (FAR void *)topaddr;
tcb->adj_stack_size -= frame_size;
return (FAR void *)(topaddr + sizeof(uint32_t));
}
#endif
void up_release_stack(struct tcb_s *dtcb, uint8_t ttype)
{
/* Is there a stack allocated? */