/* * ARM CPU Dependent Source * * * COPYRIGHT (c) 2000 Canon Research Centre France SA. * Emmanuel Raguet, mailto:raguet@crf.canon.fr * * Copyright (c) 2002 Advent Networks, Inc * Jay Monkman * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * */ #include #include #include #include #include #include #include /* _CPU_Initialize * * This routine performs processor dependent initialization. * * INPUT PARAMETERS: * cpu_table - CPU table to initialize * thread_dispatch - address of ISR disptaching routine (unused) * */ void _CPU_Initialize( rtems_cpu_table *cpu_table, void (*thread_dispatch) /* ignored on this CPU */ ) { _CPU_Table = *cpu_table; } /* * * _CPU_ISR_Get_level - returns the current interrupt level */ unsigned32 _CPU_ISR_Get_level( void ) { unsigned32 reg; asm volatile ("mrs %0, cpsr \n" \ "and %0, %0, #0xc0 \n" \ : "=r" (reg)); return reg; } /* * _CPU_ISR_install_vector * * This kernel routine installs the RTEMS handler for the * specified vector. * * Input parameters: * vector - interrupt vector number * new_handler - replacement ISR for this vector number * old_handler - pointer to store former ISR for this vector number * * FIXME: This vector scheme should be changed to allow FIQ to be * handled better. I'd like to be able to put VectorTable * elsewhere - JTM * * * Output parameters: NONE * */ void _CPU_ISR_install_vector( unsigned32 vector, proc_ptr new_handler, proc_ptr *old_handler ) { /* pointer on the redirection table in RAM */ long *VectorTable = (long *)(MAX_EXCEPTIONS * 4); if (old_handler != NULL) { old_handler = *(proc_ptr *)(VectorTable + vector); } *(VectorTable + vector) = (long)new_handler ; } void _CPU_Context_Initialize( Context_Control *the_context, unsigned32 *stack_base, unsigned32 size, unsigned32 new_level, void *entry_point, boolean is_fp ) { the_context->register_sp = ((unsigned32)(stack_base)) + (size) ; the_context->register_pc = (entry_point); the_context->register_cpsr = (new_level | 0x13); } /*PAGE * * _CPU_Install_interrupt_stack */ void _CPU_Install_interrupt_stack( void ) { /* FIXME: do something here */ #if 0 extern unsigned long _fiq_stack; extern unsigned long _fiq_stack_size; extern unsigned long _irq_stack; extern unsigned long _irq_stack_size; extern unsigned long _abt_stack; extern unsigned long _abt_stack_size; unsigned long *ptr; int i; ptr = &_fiq_stack; for (i = 0; i < ((int)&_fiq_stack_size/4); i++) { ptr[i] = 0x13131313; } ptr = &_irq_stack; for (i = 0; i < ((int)&_irq_stack_size/4); i++) { ptr[i] = 0xf0f0f0f0; } ptr = &_abt_stack; for (i = 0; i < ((int)&_abt_stack_size/4); i++) { ptr[i] = 0x55555555; } #endif } /*PAGE * * _CPU_Thread_Idle_body * * NOTES: * * 1. This is the same as the regular CPU independent algorithm. * * 2. If you implement this using a "halt", "idle", or "shutdown" * instruction, then don't forget to put it in an infinite loop. * * 3. Be warned. Some processors with onboard DMA have been known * to stop the DMA if the CPU were put in IDLE mode. This might * also be a problem with other on-chip peripherals. So use this * hook with caution. */ void _CPU_Thread_Idle_body( void ) { while(1); /* FIXME: finish this */ /* insert your "halt" instruction here */ ; } void _defaultExcHandler (CPU_Exception_frame *ctx) { printk("\n\r"); printk("----------------------------------------------------------\n\r"); printk("Exception 0x%x caught at PC 0x%x by thread %d\n", ctx->register_pc, ctx->register_lr - 4, _Thread_Executing->Object.id); printk("----------------------------------------------------------\n\r"); printk("Processor execution context at time of the fault was :\n\r"); printk("----------------------------------------------------------\n\r"); printk(" r0 = %8x r1 = %8x r2 = %8x r3 = %8x\n\r", ctx->register_r0, ctx->register_r1, ctx->register_r2, ctx->register_r3); printk(" r4 = %8x r5 = %8x r6 = %8x r7 = %8x\n\r", ctx->register_r4, ctx->register_r5, ctx->register_r6, ctx->register_r7); printk(" r8 = %8x r9 = %8x r10 = %8x\n\r", ctx->register_r8, ctx->register_r9, ctx->register_r10); printk(" fp = %8x ip = %8x sp = %8x pc = %8x\n\r", ctx->register_fp, ctx->register_ip, ctx->register_sp, ctx->register_lr - 4); printk("----------------------------------------------------------\n\r"); if (_ISR_Nest_level > 0) { /* * In this case we shall not delete the task interrupted as * it has nothing to do with the fault. We cannot return either * because the eip points to the faulty instruction so... */ printk("Exception while executing ISR!!!. System locked\n\r"); while(1); } else { printk("*********** FAULTY THREAD WILL BE DELETED **************\n\r"); rtems_task_delete(_Thread_Executing->Object.id); } } cpuExcHandlerType _currentExcHandler = _defaultExcHandler; extern void _Exception_Handler_Undef_Swi(); extern void _Exception_Handler_Abort(); /* FIXME: put comments here */ void rtems_exception_init_mngt() { ISR_Level level; _CPU_ISR_Disable(level); _CPU_ISR_install_vector(ARM_EXCEPTION_UNDEF, _Exception_Handler_Undef_Swi, NULL); _CPU_ISR_install_vector(ARM_EXCEPTION_SWI, _Exception_Handler_Undef_Swi, NULL); _CPU_ISR_install_vector(ARM_EXCEPTION_PREF_ABORT, _Exception_Handler_Abort, NULL); _CPU_ISR_install_vector(ARM_EXCEPTION_DATA_ABORT, _Exception_Handler_Abort, NULL); _CPU_ISR_install_vector(ARM_EXCEPTION_FIQ, _Exception_Handler_Abort, NULL); _CPU_ISR_install_vector(ARM_EXCEPTION_IRQ, _Exception_Handler_Abort, NULL); _CPU_ISR_Enable(level); }