1 | /* |
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2 | * This file contains the basic algorithms for all assembly code used |
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3 | * in an specific CPU port of RTEMS. These algorithms must be implemented |
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4 | * in assembly language |
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5 | * |
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6 | * NOTE: This port uses a C file with inline assembler instructions |
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7 | * |
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8 | * Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and |
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9 | * Bernd Becker (becker@faw.uni-ulm.de) |
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10 | * |
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11 | * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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16 | * |
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17 | * |
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18 | * COPYRIGHT (c) 1998. |
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19 | * On-Line Applications Research Corporation (OAR). |
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20 | * |
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21 | * The license and distribution terms for this file may be |
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22 | * found in the file LICENSE in this distribution or at |
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23 | * http://www.rtems.org/license/LICENSE. |
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24 | */ |
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25 | |
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26 | /* |
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27 | * This is supposed to be an assembly file. This means that system.h |
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28 | * and cpu.h should not be included in a "real" cpu_asm file. An |
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29 | * implementation in assembly should include "cpu_asm.h" |
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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/cpu.h> |
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34 | #include <rtems/score/isr.h> |
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35 | #include <rtems/score/threaddispatch.h> |
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36 | #include <rtems/score/sh.h> |
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37 | #include <rtems/score/ispsh7750.h> |
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38 | #include <rtems/score/iosh7750.h> |
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39 | #include <rtems/score/sh4_regs.h> |
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40 | #include <rtems/score/sh_io.h> |
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41 | |
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42 | /* from cpu_isps.c */ |
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43 | extern proc_ptr _Hardware_isr_Table[]; |
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44 | |
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45 | #if (CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE) |
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46 | unsigned long *_old_stack_ptr; |
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47 | #endif |
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48 | |
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49 | register unsigned long *stack_ptr __asm__ ("r15"); |
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50 | |
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51 | /* |
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52 | * This routine provides the RTEMS interrupt management. |
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53 | */ |
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54 | |
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55 | void __ISR_Handler( uint32_t vector) |
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56 | { |
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57 | ISR_Level level; |
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58 | |
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59 | _ISR_Local_disable( level ); |
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60 | |
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61 | _Thread_Dispatch_disable(); |
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62 | |
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63 | #if (CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE) |
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64 | if ( _ISR_Nest_level == 0 ) |
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65 | { |
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66 | /* Install irq stack */ |
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67 | _old_stack_ptr = stack_ptr; |
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68 | stack_ptr = _CPU_Interrupt_stack_high; |
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69 | } |
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70 | |
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71 | #endif |
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72 | |
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73 | _ISR_Nest_level++; |
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74 | |
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75 | _ISR_Local_enable( level ); |
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76 | |
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77 | /* call isp */ |
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78 | if ( _ISR_Vector_table[ vector]) |
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79 | (*_ISR_Vector_table[ vector ])( vector ); |
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80 | |
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81 | _ISR_Local_disable( level ); |
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82 | |
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83 | _Thread_Dispatch_enable( _Per_CPU_Get() ); |
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84 | |
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85 | _ISR_Nest_level--; |
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86 | |
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87 | #if (CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE) |
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88 | if ( _ISR_Nest_level == 0 ) |
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89 | /* restore old stack pointer */ |
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90 | stack_ptr = _old_stack_ptr; |
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91 | #endif |
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92 | |
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93 | _ISR_Local_enable( level ); |
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94 | |
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95 | if ( _ISR_Nest_level ) |
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96 | return; |
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97 | |
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98 | if ( !_Thread_Dispatch_is_enabled() ) { |
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99 | return; |
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100 | } |
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101 | |
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102 | if ( _Thread_Dispatch_necessary ) { |
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103 | _Thread_Dispatch(); |
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104 | } |
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105 | } |
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