1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Allocate and Initialize Per CPU Structures |
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5 | * @ingroup PerCPU |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2011. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/system.h> |
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22 | #include <rtems/score/thread.h> |
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23 | #include <rtems/score/percpu.h> |
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24 | #include <rtems/score/wkspace.h> |
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25 | #include <rtems/config.h> |
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26 | #include <string.h> |
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27 | |
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28 | #if defined(RTEMS_SMP) |
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29 | |
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30 | #include <rtems/score/smp.h> |
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31 | |
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32 | void _SMP_Handler_initialize(void) |
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33 | { |
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34 | uint32_t max_cpus = rtems_configuration_get_maximum_processors(); |
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35 | uint32_t cpu; |
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36 | |
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37 | /* |
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38 | * Initialize per cpu pointer table |
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39 | */ |
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40 | _Per_CPU_Information_p[0] = &_Per_CPU_Information[0]; |
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41 | for ( cpu = 1 ; cpu < max_cpus; ++cpu ) { |
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42 | |
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43 | Per_CPU_Control *p = &_Per_CPU_Information[cpu]; |
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44 | |
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45 | _Per_CPU_Information_p[cpu] = p; |
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46 | |
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47 | #if CPU_ALLOCATE_INTERRUPT_STACK == TRUE |
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48 | { |
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49 | size_t size = rtems_configuration_get_interrupt_stack_size(); |
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50 | uintptr_t ptr; |
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51 | |
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52 | p->interrupt_stack_low = _Workspace_Allocate_or_fatal_error( size ); |
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53 | |
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54 | ptr = (uintptr_t) _Addresses_Add_offset( p->interrupt_stack_low, size ); |
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55 | ptr &= ~(CPU_STACK_ALIGNMENT - 1); |
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56 | p->interrupt_stack_high = (void *)ptr; |
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57 | } |
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58 | #endif |
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59 | |
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60 | p->state = RTEMS_BSP_SMP_CPU_INITIAL_STATE; |
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61 | RTEMS_COMPILER_MEMORY_BARRIER(); |
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62 | } |
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63 | |
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64 | /* |
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65 | * Discover and initialize the secondary cores in an SMP system. |
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66 | */ |
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67 | max_cpus = bsp_smp_initialize( max_cpus ); |
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68 | |
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69 | _SMP_Processor_count = max_cpus; |
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70 | } |
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71 | #else |
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72 | /* |
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73 | * On single core systems, we can efficiently directly access a single |
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74 | * statically allocated per cpu structure. And the fields are initialized |
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75 | * as individual elements just like it has always been done. |
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76 | */ |
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77 | Per_CPU_Control _Per_CPU_Information[1]; |
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78 | #endif |
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