1 | /* |
---|
2 | * Thread Handler |
---|
3 | * |
---|
4 | * |
---|
5 | * COPYRIGHT (c) 1989-2008. |
---|
6 | * On-Line Applications Research Corporation (OAR). |
---|
7 | * |
---|
8 | * The license and distribution terms for this file may be |
---|
9 | * found in found in the file LICENSE in this distribution or at |
---|
10 | * http://www.rtems.com/license/LICENSE. |
---|
11 | * |
---|
12 | * $Id$ |
---|
13 | */ |
---|
14 | |
---|
15 | #if HAVE_CONFIG_H |
---|
16 | #include "config.h" |
---|
17 | #endif |
---|
18 | |
---|
19 | #include <rtems/system.h> |
---|
20 | #include <rtems/score/apiext.h> |
---|
21 | #include <rtems/score/context.h> |
---|
22 | #include <rtems/score/interr.h> |
---|
23 | #include <rtems/score/isr.h> |
---|
24 | #include <rtems/score/object.h> |
---|
25 | #include <rtems/score/priority.h> |
---|
26 | #include <rtems/score/states.h> |
---|
27 | #include <rtems/score/sysstate.h> |
---|
28 | #include <rtems/score/thread.h> |
---|
29 | #include <rtems/score/threadq.h> |
---|
30 | #include <rtems/score/userext.h> |
---|
31 | #include <rtems/score/wkspace.h> |
---|
32 | #include <rtems/config.h> |
---|
33 | |
---|
34 | /*PAGE |
---|
35 | * |
---|
36 | * _Thread_Stack_Allocate |
---|
37 | * |
---|
38 | * Allocate the requested stack space for the thread. |
---|
39 | * return the actual size allocated after any adjustment |
---|
40 | * or return zero if the allocation failed. |
---|
41 | * Set the Start.stack field to the address of the stack |
---|
42 | */ |
---|
43 | |
---|
44 | size_t _Thread_Stack_Allocate( |
---|
45 | Thread_Control *the_thread, |
---|
46 | size_t stack_size |
---|
47 | ) |
---|
48 | { |
---|
49 | void *stack_addr = 0; |
---|
50 | size_t the_stack_size = stack_size; |
---|
51 | |
---|
52 | the_stack_size = _Stack_Ensure_minimum( stack_size ); |
---|
53 | |
---|
54 | /* |
---|
55 | * Call ONLY the CPU table stack allocate hook, _or_ the |
---|
56 | * the RTEMS workspace allocate. This is so the stack free |
---|
57 | * routine can call the correct deallocation routine. |
---|
58 | */ |
---|
59 | |
---|
60 | if ( Configuration.stack_allocate_hook ) { |
---|
61 | stack_addr = (*Configuration.stack_allocate_hook)( the_stack_size ); |
---|
62 | } else { |
---|
63 | |
---|
64 | /* |
---|
65 | * First pad the requested size so we allocate enough memory |
---|
66 | * so the context initialization can align it properly. The address |
---|
67 | * returned the workspace allocate must be directly stored in the |
---|
68 | * stack control block because it is later used in the free sequence. |
---|
69 | * |
---|
70 | * Thus it is the responsibility of the CPU dependent code to |
---|
71 | * get and keep the stack adjust factor, the stack alignment, and |
---|
72 | * the context initialization sequence in sync. |
---|
73 | */ |
---|
74 | |
---|
75 | the_stack_size = _Stack_Adjust_size( the_stack_size ); |
---|
76 | stack_addr = _Workspace_Allocate( the_stack_size ); |
---|
77 | } |
---|
78 | |
---|
79 | if ( !stack_addr ) |
---|
80 | the_stack_size = 0; |
---|
81 | |
---|
82 | the_thread->Start.stack = stack_addr; |
---|
83 | |
---|
84 | return the_stack_size; |
---|
85 | } |
---|