1 | /* |
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2 | * Thread Handler |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-1999. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in found in the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include <rtems/system.h> |
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16 | #include <rtems/score/apiext.h> |
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17 | #include <rtems/score/context.h> |
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18 | #include <rtems/score/interr.h> |
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19 | #include <rtems/score/isr.h> |
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20 | #include <rtems/score/object.h> |
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21 | #include <rtems/score/priority.h> |
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22 | #include <rtems/score/states.h> |
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23 | #include <rtems/score/sysstate.h> |
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24 | #include <rtems/score/thread.h> |
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25 | #include <rtems/score/threadq.h> |
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26 | #include <rtems/score/userext.h> |
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27 | #include <rtems/score/wkspace.h> |
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28 | |
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29 | /*PAGE |
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30 | * |
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31 | * _Thread_Stack_Allocate |
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32 | * |
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33 | * Allocate the requested stack space for the thread. |
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34 | * return the actual size allocated after any adjustment |
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35 | * or return zero if the allocation failed. |
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36 | * Set the Start.stack field to the address of the stack |
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37 | */ |
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38 | |
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39 | unsigned32 _Thread_Stack_Allocate( |
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40 | Thread_Control *the_thread, |
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41 | unsigned32 stack_size |
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42 | ) |
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43 | { |
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44 | void *stack_addr = 0; |
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45 | |
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46 | if ( !_Stack_Is_enough( stack_size ) ) |
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47 | stack_size = STACK_MINIMUM_SIZE; |
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48 | |
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49 | /* |
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50 | * Call ONLY the CPU table stack allocate hook, _or_ the |
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51 | * the RTEMS workspace allocate. This is so the stack free |
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52 | * routine can call the correct deallocation routine. |
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53 | */ |
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54 | |
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55 | if ( _CPU_Table.stack_allocate_hook ) |
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56 | { |
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57 | stack_addr = (*_CPU_Table.stack_allocate_hook)( stack_size ); |
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58 | } else { |
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59 | |
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60 | /* |
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61 | * First pad the requested size so we allocate enough memory |
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62 | * so the context initialization can align it properly. The address |
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63 | * returned the workspace allocate must be directly stored in the |
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64 | * stack control block because it is later used in the free sequence. |
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65 | * |
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66 | * Thus it is the responsibility of the CPU dependent code to |
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67 | * get and keep the stack adjust factor, the stack alignment, and |
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68 | * the context initialization sequence in sync. |
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69 | */ |
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70 | |
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71 | stack_size = _Stack_Adjust_size( stack_size ); |
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72 | stack_addr = _Workspace_Allocate( stack_size ); |
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73 | } |
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74 | |
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75 | if ( !stack_addr ) |
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76 | stack_size = 0; |
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77 | |
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78 | the_thread->Start.stack = stack_addr; |
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79 | |
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80 | return stack_size; |
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81 | } |
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