/*
* Mips CPU Dependent Source
*
* Author: Craig Lebakken <craigl@transition.com>
*
* COPYRIGHT (c) 1996 by Transition Networks Inc.
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of Transition Networks not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* Transition Networks makes no representations about the suitability
* of this software for any purpose.
*
* Derived from c/src/exec/score/cpu/no_cpu/cpu.c:
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* cpu.c,v 1.7 1995/09/26 19:25:37 joel Exp
*/
#ifndef lint
static char _sccsid[] = "@(#)cpu.c 08/20/96 1.5\n";
#endif
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/wkspace.h>
ISR_Handler_entry _ISR_Vector_table[ ISR_NUMBER_OF_VECTORS ];
/* _CPU_Initialize
*
* This routine performs processor dependent initialization.
*
* INPUT PARAMETERS:
* cpu_table - CPU table to initialize
* thread_dispatch - address of disptaching routine
*/
void null_handler( void )
{
}
void _CPU_Initialize(
rtems_cpu_table *cpu_table,
void (*thread_dispatch) /* ignored on this CPU */
)
{
unsigned int i = ISR_NUMBER_OF_VECTORS;
while ( i-- )
{
_ISR_Vector_table[i] = (ISR_Handler_entry)null_handler;
}
/*
* The thread_dispatch argument is the address of the entry point
* for the routine called at the end of an ISR once it has been
* decided a context switch is necessary. On some compilation
* systems it is difficult to call a high-level language routine
* from assembly. This allows us to trick these systems.
*
* If you encounter this problem save the entry point in a CPU
* dependent variable.
*/
_CPU_Thread_dispatch_pointer = thread_dispatch;
/*
* If there is not an easy way to initialize the FP context
* during Context_Initialize, then it is usually easier to
* save an "uninitialized" FP context here and copy it to
* the task's during Context_Initialize.
*/
/* FP context initialization support goes here */
_CPU_Table = *cpu_table;
}
/*PAGE
*
* _CPU_ISR_Get_level
*/
#if 0 /* located in cpu_asm.S */
unsigned32 _CPU_ISR_Get_level( void )
{
/*
* This routine returns the current interrupt level.
*/
}
#endif
/*PAGE
*
* _CPU_ISR_install_raw_handler
*/
void _CPU_ISR_install_raw_handler(
unsigned32 vector,
proc_ptr new_handler,
proc_ptr *old_handler
)
{
/*
* This is where we install the interrupt handler into the "raw" interrupt
* table used by the CPU to dispatch interrupt handlers.
*/
#if 0 /* not necessary */
/* use IDT/Sim to set interrupt vector. Needed to co-exist with debugger. */
add_ext_int_func( vector, new_handler );
#endif
}
/*PAGE
*
* _CPU_ISR_install_vector
*
* This kernel routine installs the RTEMS handler for the
* specified vector.
*
* Input parameters:
* vector - interrupt vector number
* old_handler - former ISR for this vector number
* new_handler - replacement ISR for this vector number
*
* Output parameters: NONE
*
*/
void _CPU_ISR_install_vector(
unsigned32 vector,
proc_ptr new_handler,
proc_ptr *old_handler
)
{
*old_handler = _ISR_Vector_table[ vector ];
/*
* If the interrupt vector table is a table of pointer to isr entry
* points, then we need to install the appropriate RTEMS interrupt
* handler for this vector number.
*/
_CPU_ISR_install_raw_handler( vector, _ISR_Handler, old_handler );
/*
* We put the actual user ISR address in '_ISR_vector_table'. This will
* be used by the _ISR_Handler so the user gets control.
*/
_ISR_Vector_table[ vector ] = new_handler;
}
/*PAGE
*
* _CPU_Install_interrupt_stack
*/
void _CPU_Install_interrupt_stack( void )
{
/* we don't support this yet */
}
/*PAGE
*
* _CPU_Internal_threads_Idle_thread_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.
*/
#if 0 /* located in cpu_asm.S */
void _CPU_Thread_Idle_body( void )
{
for( ; ; )
/* insert your "halt" instruction here */ ;
}
#endif
extern void mips_break( int error );
#include <stdio.h>
void mips_fatal_error( int error )
{
printf("fatal error 0x%x %d\n",error,error);
mips_break( error );
}
