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/**
* @file cpu.c
*
* ARM CPU Dependent Source.
*/
/*
* RTEMS GBA BSP
*
* COPYRIGHT (c) 2000 Canon Research Centre France SA.
* Emmanuel Raguet, mailto:raguet@crf.canon.fr
*
* Copyright (c) 2002 Advent Networks, Inc
* Jay Monkman <jmonkman@adventnetworks.com>
*
* Copyright (c) 2004
* Markku Puro <markku.puro@kopteri.net>
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <stdint.h>
#include <rtems/system.h>
#include <rtems.h>
#include <rtems/bspIo.h>
#include <rtems/score/isr.h>
#include <rtems/score/wkspace.h>
#include <rtems/score/thread.h>
#include <rtems/score/cpu.h>
#include <arm_mode_bits.h>
/**
* @brief _CPU_Initialize routine performs processor dependent initialization
*
* @param cpu_table CPU table to initialize
* @param thread_dispatch address of ISR disptaching routine (unused)
* @return None
*/
void _CPU_Initialize(
rtems_cpu_table *cpu_table,
void (*thread_dispatch) /* ignored on this CPU */
)
{
_CPU_Table = *cpu_table;
}
/**
* @brief _CPU_ISR_Get_level returns the current interrupt level
*
* @param None
* @return int level
*/
uint32_t _CPU_ISR_Get_level( void )
{
uint32_t reg = 0; /* to avoid warning */
asm volatile ("mrs %0, cpsr \n" \
"and %0, %0, #0xc0 \n" \
: "=r" (reg) \
: "0" (reg) );
return reg;
}
/**
* @brief _CPU_ISR_install_vector kernel routine installs the RTEMS handler for the
* specified vector
*
* @param vector interrupt vector number
* @param new_handler replacement ISR for this vector number
* @param old_handler pointer to store former ISR for this vector number
* @return None
*
* @todo Can't use exception vectors in GBA because they are already in GBA ROM BIOS!!
*/
extern __inline__ void _CPU_ISR_install_vector(uint32_t vector, proc_ptr new_handler, proc_ptr *old_handler);
/**
* @brief _CPU_Context_Initialize kernel routine initialize the specified context
*
* @param the_context
* @param stack_base
* @param size
* @param new_level
* @param entry_point
* @param is_fp
* @return None
*/
void _CPU_Context_Initialize(
Context_Control *the_context,
uint32_t *stack_base,
uint32_t size,
uint32_t new_level,
void *entry_point,
boolean is_fp
)
{
the_context->register_sp = (uint32_t)stack_base + size ;
the_context->register_lr = (uint32_t)entry_point;
the_context->register_cpsr = new_level | ModePriv;
}
/**
* @brief _CPU_Install_interrupt_stack function is empty since the BSP must set up the interrupt stacks.
*
* @todo Can't use exception vectors in GBA because they are already in GBA ROM BIOS!!
*/
extern __inline__ void _CPU_Install_interrupt_stack( void );
/**
* @brief _defaultExcHandler function is empty
*
* @todo Can't use exception vectors in GBA because they are already in GBA ROM BIOS!!
*/
extern void _defaultExcHandler (CPU_Exception_frame *ctx);
/**
* @brief _currentExcHandler function is empty (_defaultExcHandler)
*
* @todo Can't use exception vectors in GBA because they are already in GBA ROM BIOS!!
*/
cpuExcHandlerType _currentExcHandler = _defaultExcHandler;
/*
extern void _Exception_Handler_Undef_Swi();
extern void _Exception_Handler_Abort();
extern void _exc_data_abort();
*/
/**
* @brief rtems_exception_init_mngt function is empty since the BSP must set up the interrupt stacks.
*
* @todo Can't use exception vectors in GBA because they are already in GBA ROM BIOS!!
*/
extern __inline__ void rtems_exception_init_mngt();
/**
* @brief do_data_abort function is empty
*
* This function figure out what caused the data abort
*
* @todo Can't use exception vectors in GBA because they are already in GBA ROM BIOS!!
* This function is supposed to figure out what caused the data abort, do that, then return.
* All unhandled instructions cause the system to hang.
*/
extern __inline__ void do_data_abort(uint32_t insn, uint32_t spsr, CPU_Exception_frame *ctx);
/* @todo Can't use exception vectors in GBA because they are already in GBA ROM BIOS!! */
/* @todo Remove dummy functions needed by linker
****************************************************************************************/
/* @cond INCLUDE_ASM */
asm (" .text");
asm (" .arm");
asm (" .global _CPU_ISR_install_vector");
asm ("_CPU_ISR_install_vector:");
asm (" .global _CPU_Install_interrupt_stack");
asm ("_CPU_Install_interrupt_stack:");
asm (" .global _defaultExcHandler");
asm ("_defaultExcHandler:");
asm (" .global rtems_exception_init_mngt");
asm ("rtems_exception_init_mngt:");
asm (" .global do_data_abort");
asm ("do_data_abort:");
asm (" mov pc, lr");
/* @endcond */
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