[ac7d5ef0] | 1 | /* |
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| 2 | * HP PA-RISC Dependent Source |
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| 3 | * |
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| 4 | * COPYRIGHT (c) 1994 by Division Incorporated |
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| 5 | * |
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| 6 | * To anyone who acknowledges that this file is provided "AS IS" |
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| 7 | * without any express or implied warranty: |
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| 8 | * permission to use, copy, modify, and distribute this file |
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| 9 | * for any purpose is hereby granted without fee, provided that |
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| 10 | * the above copyright notice and this notice appears in all |
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| 11 | * copies, and that the name of Division Incorporated not be |
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| 12 | * used in advertising or publicity pertaining to distribution |
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| 13 | * of the software without specific, written prior permission. |
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| 14 | * Division Incorporated makes no representations about the |
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| 15 | * suitability of this software for any purpose. |
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| 16 | * |
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[eb5a7e07] | 17 | * $Id$ |
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[ac7d5ef0] | 18 | */ |
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| 19 | |
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| 20 | #include <rtems/system.h> |
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[ca201c9] | 21 | #include <rtems/score/isr.h> |
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[ac7d5ef0] | 22 | |
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[3a4ae6c] | 23 | void hppa_external_interrupt_initialize(void); |
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[ac7d5ef0] | 24 | void hppa_external_interrupt_enable(unsigned32); |
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| 25 | void hppa_external_interrupt_disable(unsigned32); |
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| 26 | void hppa_external_interrupt(unsigned32, CPU_Interrupt_frame *); |
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[c64e4ed4] | 27 | void hppa_cpu_halt(unsigned32); |
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[ac7d5ef0] | 28 | |
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| 29 | /* |
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[c64e4ed4] | 30 | * The first level interrupt handler for first 32 interrupts/traps. |
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| 31 | * Indexed by vector; generally each entry is _Generic_ISR_Handler. |
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| 32 | * Some TLB traps may have their own first level handler. |
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[ac7d5ef0] | 33 | */ |
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| 34 | |
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[c64e4ed4] | 35 | extern void _Generic_ISR_Handler(void); |
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| 36 | unsigned32 HPPA_first_level_interrupt_handler[HPPA_INTERNAL_INTERRUPTS]; |
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[ac7d5ef0] | 37 | |
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| 38 | /* _CPU_Initialize |
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| 39 | * |
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| 40 | * This routine performs processor dependent initialization. |
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| 41 | * |
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| 42 | * INPUT PARAMETERS: |
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| 43 | * cpu_table - CPU table to initialize |
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| 44 | * thread_dispatch - address of disptaching routine |
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| 45 | * |
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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 | register unsigned8 *fp_context; |
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| 54 | unsigned32 iva; |
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| 55 | unsigned32 iva_table; |
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| 56 | int i; |
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| 57 | |
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| 58 | extern void IVA_Table(void); |
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| 59 | |
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| 60 | /* |
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| 61 | * XXX; need to setup fpsr smarter perhaps |
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| 62 | */ |
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| 63 | |
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| 64 | fp_context = (unsigned8*) &_CPU_Null_fp_context; |
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| 65 | for (i=0 ; i<sizeof(Context_Control_fp); i++) |
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| 66 | *fp_context++ = 0; |
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| 67 | |
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| 68 | /* |
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| 69 | * Set _CPU_Default_gr27 here so it will hopefully be the correct |
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| 70 | * global data pointer for the entire system. |
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| 71 | */ |
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| 72 | |
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| 73 | asm volatile( "stw %%r27,%0" : "=m" (_CPU_Default_gr27): ); |
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| 74 | |
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[c64e4ed4] | 75 | /* |
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| 76 | * Init the first level interrupt handlers |
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| 77 | */ |
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| 78 | |
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| 79 | for (i=0; i <= HPPA_INTERNAL_INTERRUPTS; i++) |
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| 80 | HPPA_first_level_interrupt_handler[i] = (unsigned32) _Generic_ISR_Handler; |
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| 81 | |
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| 82 | /* |
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| 83 | * Init the 2nd level interrupt handlers |
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| 84 | */ |
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| 85 | |
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| 86 | for (i=0; i <= CPU_INTERRUPT_NUMBER_OF_VECTORS; i++) |
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| 87 | _ISR_Vector_table[i] = (ISR_Handler_entry) hppa_cpu_halt; |
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| 88 | |
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[ac7d5ef0] | 89 | /* |
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| 90 | * Stabilize the interrupt stuff |
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| 91 | */ |
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| 92 | |
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| 93 | (void) hppa_external_interrupt_initialize(); |
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| 94 | |
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| 95 | /* |
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| 96 | * Set the IVA to point to physical address of the IVA_Table |
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| 97 | */ |
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| 98 | |
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| 99 | iva_table = (unsigned32) IVA_Table; |
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[c64e4ed4] | 100 | #if defined(hppa1_1) |
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| 101 | /* |
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| 102 | * HACK: (from PA72000 TRM, page 4-19) |
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| 103 | * "The hardware TLB miss handler will never attempt to service |
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| 104 | * a non-access TLB miss or a TLB protection violation. It |
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| 105 | * will only attempt to service TLB accesses that would cause |
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| 106 | * Trap Numbers 6 (Instruction TLB miss) and 15 (Data TLB miss)." |
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| 107 | * |
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| 108 | * The LPA instruction is used to translate a virtual address to |
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| 109 | * a physical address, however, if the requested virtual address |
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| 110 | * is not currently resident in the TLB, the hardware TLB miss |
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| 111 | * handler will NOT insert it. In this situation Trap Number |
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| 112 | * #17 is invoked (Non-access Data TLB miss fault). |
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| 113 | * |
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| 114 | * To work around this, a dummy data access is first performed |
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| 115 | * to the virtual address prior to the LPA. The dummy access |
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| 116 | * causes the TLB entry to be inserted (if not already present) |
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| 117 | * and then the following LPA instruction will not generate |
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| 118 | * a non-access data TLB miss fault. |
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| 119 | * |
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| 120 | * It is unclear whether or not this behaves the same way for |
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| 121 | * the PA8000. |
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| 122 | * |
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| 123 | */ |
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| 124 | iva = *(volatile unsigned32 *)iva_table; /* dummy access */ |
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| 125 | #endif |
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| 126 | |
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[ac7d5ef0] | 127 | HPPA_ASM_LPA(0, iva_table, iva); |
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| 128 | set_iva(iva); |
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| 129 | |
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| 130 | _CPU_Table = *cpu_table; |
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| 131 | } |
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| 132 | |
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[11290355] | 133 | /*PAGE |
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| 134 | * |
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| 135 | * _CPU_ISR_Get_level |
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| 136 | */ |
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| 137 | |
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| 138 | unsigned32 _CPU_ISR_Get_level(void) |
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| 139 | { |
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| 140 | int level; |
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| 141 | HPPA_ASM_SSM(0, level); /* change no bits; just get copy */ |
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| 142 | if (level & HPPA_PSW_I) |
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[c64e4ed4] | 143 | return 0; |
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| 144 | return 1; |
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[11290355] | 145 | } |
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| 146 | |
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[637df35] | 147 | /*PAGE |
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| 148 | * |
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| 149 | * _CPU_ISR_install_raw_handler |
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| 150 | */ |
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| 151 | |
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| 152 | void _CPU_ISR_install_raw_handler( |
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| 153 | unsigned32 vector, |
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| 154 | proc_ptr new_handler, |
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| 155 | proc_ptr *old_handler |
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| 156 | ) |
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| 157 | { |
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| 158 | /* |
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| 159 | * This is unsupported. |
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| 160 | */ |
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| 161 | |
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| 162 | _CPU_Fatal_halt( 0xdeaddead ); |
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| 163 | } |
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| 164 | |
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| 165 | /*PAGE |
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| 166 | * |
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| 167 | * _CPU_ISR_install_vector |
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[ac7d5ef0] | 168 | * |
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| 169 | * This kernel routine installs the RTEMS handler for the |
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| 170 | * specified vector. |
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| 171 | * |
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| 172 | * Input parameters: |
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| 173 | * vector - interrupt vector number |
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| 174 | * old_handler - former ISR for this vector number |
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| 175 | * new_handler - replacement ISR for this vector number |
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| 176 | * |
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| 177 | * Output parameters: NONE |
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| 178 | * |
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| 179 | */ |
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| 180 | |
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| 181 | /* |
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| 182 | * HPPA has 8w for each vector instead of an address to jump to. |
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| 183 | * We put the actual ISR address in '_ISR_vector_table'. This will |
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| 184 | * be pulled by the code in the vector. |
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| 185 | */ |
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| 186 | |
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| 187 | void _CPU_ISR_install_vector( |
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| 188 | unsigned32 vector, |
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| 189 | proc_ptr new_handler, |
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| 190 | proc_ptr *old_handler |
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| 191 | ) |
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| 192 | { |
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| 193 | *old_handler = _ISR_Vector_table[vector]; |
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| 194 | |
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| 195 | _ISR_Vector_table[vector] = new_handler; |
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| 196 | |
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| 197 | if (vector >= HPPA_INTERRUPT_EXTERNAL_BASE) |
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| 198 | { |
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| 199 | unsigned32 external_vector; |
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| 200 | |
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| 201 | external_vector = vector - HPPA_INTERRUPT_EXTERNAL_BASE; |
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| 202 | if (new_handler) |
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| 203 | hppa_external_interrupt_enable(external_vector); |
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| 204 | else |
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| 205 | /* XXX this can never happen due to _ISR_Is_valid_user_handler */ |
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| 206 | hppa_external_interrupt_disable(external_vector); |
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| 207 | } |
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| 208 | } |
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| 209 | |
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| 210 | |
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| 211 | /* |
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| 212 | * Support for external and spurious interrupts on HPPA |
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| 213 | * |
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| 214 | * TODO: |
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| 215 | * Count interrupts |
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| 216 | * make sure interrupts disabled properly |
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| 217 | */ |
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| 218 | |
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| 219 | #define DISMISS(mask) set_eirr(mask) |
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| 220 | #define DISABLE(mask) set_eiem(get_eiem() & ~(mask)) |
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| 221 | #define ENABLE(mask) set_eiem(get_eiem() | (mask)) |
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| 222 | #define VECTOR_TO_MASK(v) (1 << (31 - (v))) |
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| 223 | |
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| 224 | /* |
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| 225 | * Init the external interrupt scheme |
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| 226 | * called by bsp_start() |
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| 227 | */ |
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| 228 | |
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[3a4ae6c] | 229 | void |
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[ac7d5ef0] | 230 | hppa_external_interrupt_initialize(void) |
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| 231 | { |
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[591d45e] | 232 | proc_ptr ignore; |
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[ac7d5ef0] | 233 | |
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| 234 | /* mark them all unused */ |
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| 235 | DISABLE(~0); |
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| 236 | DISMISS(~0); |
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| 237 | |
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| 238 | /* install the external interrupt handler */ |
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[c64e4ed4] | 239 | _CPU_ISR_install_vector( |
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| 240 | HPPA_INTERRUPT_EXTERNAL_INTERRUPT, |
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| 241 | (proc_ptr)hppa_external_interrupt, &ignore |
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| 242 | ); |
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[ac7d5ef0] | 243 | } |
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| 244 | |
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| 245 | /* |
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| 246 | * Enable a specific external interrupt |
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| 247 | */ |
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| 248 | |
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| 249 | void |
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| 250 | hppa_external_interrupt_enable(unsigned32 v) |
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| 251 | { |
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| 252 | unsigned32 isrlevel; |
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| 253 | |
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| 254 | _CPU_ISR_Disable(isrlevel); |
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| 255 | ENABLE(VECTOR_TO_MASK(v)); |
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| 256 | _CPU_ISR_Enable(isrlevel); |
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| 257 | } |
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| 258 | |
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| 259 | /* |
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| 260 | * Does not clear or otherwise affect any pending requests |
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| 261 | */ |
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| 262 | |
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| 263 | void |
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| 264 | hppa_external_interrupt_disable(unsigned32 v) |
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| 265 | { |
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| 266 | unsigned32 isrlevel; |
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| 267 | |
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| 268 | _CPU_ISR_Disable(isrlevel); |
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| 269 | DISABLE(VECTOR_TO_MASK(v)); |
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| 270 | _CPU_ISR_Enable(isrlevel); |
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| 271 | } |
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| 272 | |
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| 273 | void |
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| 274 | hppa_external_interrupt_spurious_handler(unsigned32 vector, |
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| 275 | CPU_Interrupt_frame *iframe) |
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| 276 | { |
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| 277 | /* XXX should not be printing :) |
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| 278 | printf("spurious external interrupt: %d at pc 0x%x; disabling\n", |
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| 279 | vector, iframe->Interrupt.pcoqfront); |
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| 280 | */ |
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| 281 | } |
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| 282 | |
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| 283 | void |
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[c64e4ed4] | 284 | hppa_external_interrupt_report_spurious(unsigned32 spurious_mask, |
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[ac7d5ef0] | 285 | CPU_Interrupt_frame *iframe) |
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| 286 | { |
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| 287 | int v; |
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| 288 | for (v=0; v < HPPA_EXTERNAL_INTERRUPTS; v++) |
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[c64e4ed4] | 289 | if (VECTOR_TO_MASK(v) & spurious_mask) |
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| 290 | { |
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| 291 | DISMISS(VECTOR_TO_MASK(v)); |
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| 292 | DISABLE(VECTOR_TO_MASK(v)); |
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[ac7d5ef0] | 293 | hppa_external_interrupt_spurious_handler(v, iframe); |
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[c64e4ed4] | 294 | } |
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| 295 | DISMISS(spurious_mask); |
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[ac7d5ef0] | 296 | } |
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| 297 | |
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| 298 | |
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| 299 | /* |
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| 300 | * External interrupt handler. |
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| 301 | * This is installed as cpu interrupt handler for |
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| 302 | * HPPA_INTERRUPT_EXTERNAL_INTERRUPT. It vectors out to |
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| 303 | * specific external interrupt handlers. |
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| 304 | */ |
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| 305 | |
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| 306 | void |
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| 307 | hppa_external_interrupt(unsigned32 vector, |
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| 308 | CPU_Interrupt_frame *iframe) |
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| 309 | { |
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| 310 | unsigned32 mask; |
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| 311 | unsigned32 *vp, *max_vp; |
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| 312 | unsigned32 external_vector; |
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| 313 | unsigned32 global_vector; |
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| 314 | hppa_rtems_isr_entry handler; |
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| 315 | |
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| 316 | max_vp = &_CPU_Table.external_interrupt[_CPU_Table.external_interrupts]; |
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| 317 | while ( (mask = (get_eirr() & get_eiem())) ) |
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| 318 | { |
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| 319 | for (vp = _CPU_Table.external_interrupt; (vp < max_vp) && mask; vp++) |
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| 320 | { |
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| 321 | unsigned32 m; |
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| 322 | |
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| 323 | external_vector = *vp; |
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| 324 | global_vector = external_vector + HPPA_INTERRUPT_EXTERNAL_BASE; |
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| 325 | m = VECTOR_TO_MASK(external_vector); |
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| 326 | handler = (hppa_rtems_isr_entry) _ISR_Vector_table[global_vector]; |
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| 327 | if ((m & mask) && handler) |
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| 328 | { |
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| 329 | DISMISS(m); |
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| 330 | mask &= ~m; |
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[c64e4ed4] | 331 | handler(global_vector, iframe); |
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[ac7d5ef0] | 332 | } |
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| 333 | } |
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| 334 | |
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| 335 | if (mask != 0) { |
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| 336 | if ( _CPU_Table.spurious_handler ) |
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[c64e4ed4] | 337 | { |
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| 338 | handler = (hppa_rtems_isr_entry) _CPU_Table.spurious_handler; |
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| 339 | handler(mask, iframe); |
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| 340 | } |
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[ac7d5ef0] | 341 | else |
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[c64e4ed4] | 342 | hppa_external_interrupt_report_spurious(mask, iframe); |
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[ac7d5ef0] | 343 | } |
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| 344 | } |
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| 345 | } |
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| 346 | |
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| 347 | /* |
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| 348 | * Halt the system. |
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| 349 | * Called by the _CPU_Fatal_halt macro |
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| 350 | * |
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| 351 | * XXX |
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| 352 | * Later on, this will allow us to return to the prom. |
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| 353 | * For now, we just ignore 'type_of_halt' |
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| 354 | */ |
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| 355 | |
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| 356 | void |
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[c64e4ed4] | 357 | hppa_cpu_halt(unsigned32 the_error) |
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[ac7d5ef0] | 358 | { |
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| 359 | unsigned32 isrlevel; |
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| 360 | |
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| 361 | _CPU_ISR_Disable(isrlevel); |
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| 362 | |
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[c64e4ed4] | 363 | HPPA_ASM_LABEL("_hppa_cpu_halt"); |
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[ac7d5ef0] | 364 | HPPA_ASM_BREAK(1, 0); |
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| 365 | } |
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