1 | /* |
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2 | * PowerPC CPU Dependent Source |
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3 | * |
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4 | * Author: Andrew Bray <andy@i-cubed.co.uk> |
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5 | * |
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6 | * COPYRIGHT (c) 1995 by i-cubed ltd. |
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7 | * |
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8 | * To anyone who acknowledges that this file is provided "AS IS" |
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9 | * without any express or implied warranty: |
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10 | * permission to use, copy, modify, and distribute this file |
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11 | * for any purpose is hereby granted without fee, provided that |
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12 | * the above copyright notice and this notice appears in all |
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13 | * copies, and that the name of i-cubed limited not be used in |
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14 | * advertising or publicity pertaining to distribution of the |
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15 | * software without specific, written prior permission. |
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16 | * i-cubed limited makes no representations about the suitability |
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17 | * of this software for any purpose. |
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18 | * |
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19 | * Derived from c/src/exec/cpu/no_cpu/cpu.c: |
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20 | * |
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21 | * COPYRIGHT (c) 1989-1997. |
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22 | * On-Line Applications Research Corporation (OAR). |
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23 | * Copyright assigned to U.S. Government, 1994. |
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24 | * |
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25 | * The license and distribution terms for this file may be found in |
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26 | * the file LICENSE in this distribution or at |
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27 | * http://www.OARcorp.com/rtems/license.html. |
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28 | * |
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29 | * $Id$ |
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30 | */ |
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31 | |
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32 | #include <rtems/system.h> |
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33 | #include <rtems/score/isr.h> |
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34 | #include <rtems/score/context.h> |
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35 | #include <rtems/score/thread.h> |
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36 | #include <rtems/score/interr.h> |
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37 | |
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38 | |
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39 | /* _CPU_Initialize |
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40 | * |
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41 | * This routine performs processor dependent initialization. |
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42 | * |
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43 | * INPUT PARAMETERS: |
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44 | * cpu_table - CPU table to initialize |
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45 | * thread_dispatch - address of disptaching routine |
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46 | */ |
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47 | |
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48 | void _CPU_Initialize( |
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49 | rtems_cpu_table *cpu_table, |
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50 | void (*thread_dispatch) /* ignored on this CPU */ |
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51 | ) |
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52 | { |
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53 | _CPU_Table = *cpu_table; |
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54 | } |
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55 | |
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56 | /*PAGE |
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57 | * |
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58 | * _CPU_Context_Initialize |
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59 | */ |
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60 | |
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61 | void _CPU_Context_Initialize( |
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62 | Context_Control *the_context, |
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63 | unsigned32 *stack_base, |
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64 | unsigned32 size, |
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65 | unsigned32 new_level, |
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66 | void *entry_point, |
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67 | boolean is_fp |
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68 | ) |
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69 | { |
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70 | unsigned32 msr_value; |
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71 | unsigned32 sp; |
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72 | |
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73 | sp = (unsigned32)stack_base + size - CPU_MINIMUM_STACK_FRAME_SIZE; |
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74 | *((unsigned32 *)sp) = 0; |
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75 | the_context->gpr1 = sp; |
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76 | |
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77 | _CPU_MSR_GET( msr_value ); |
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78 | |
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79 | if (!(new_level & CPU_MODES_INTERRUPT_MASK)) { |
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80 | msr_value |= MSR_EE; |
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81 | } |
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82 | else { |
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83 | msr_value &= ~MSR_EE; |
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84 | } |
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85 | |
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86 | the_context->msr = msr_value; |
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87 | |
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88 | /* |
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89 | * The FP bit of the MSR should only be enabled if this is a floating |
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90 | * point task. Unfortunately, the vfprintf_r routine in newlib |
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91 | * ends up pushing a floating point register regardless of whether or |
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92 | * not a floating point number is being printed. Serious restructuring |
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93 | * of vfprintf.c will be required to avoid this behavior. At this |
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94 | * time (7 July 1997), this restructuring is not being done. |
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95 | */ |
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96 | |
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97 | /*if ( is_fp ) */ |
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98 | the_context->msr |= PPC_MSR_FP; |
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99 | |
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100 | the_context->pc = (unsigned32)entry_point; |
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101 | } |
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102 | |
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103 | |
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104 | |
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105 | /*PAGE |
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106 | * |
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107 | * _CPU_Install_interrupt_stack |
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108 | */ |
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109 | |
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110 | void _CPU_Install_interrupt_stack( void ) |
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111 | { |
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112 | } |
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113 | |
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114 | |
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115 | |
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116 | |
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