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/**
* @file
*
* @ingroup ScoreCPU
*
* @brief ARM architecture support implementation.
*/
/*
* 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) 2007 Ray xu <rayx.cn@gmail.com>
*
* Copyright (c) 2009-2011 embedded brains GmbH
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#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/tls.h>
#include <rtems/score/cpu.h>
#ifdef ARM_MULTILIB_VFP_D32
RTEMS_STATIC_ASSERT(
offsetof( Context_Control, register_d8 ) == ARM_CONTEXT_CONTROL_D8_OFFSET,
ARM_CONTEXT_CONTROL_D8_OFFSET
);
#endif
#ifdef ARM_MULTILIB_HAS_THREAD_ID_REGISTER
RTEMS_STATIC_ASSERT(
offsetof( Context_Control, thread_id )
== ARM_CONTEXT_CONTROL_THREAD_ID_OFFSET,
ARM_CONTEXT_CONTROL_THREAD_ID_OFFSET
);
#endif
#ifdef RTEMS_SMP
RTEMS_STATIC_ASSERT(
offsetof( Context_Control, is_executing )
== ARM_CONTEXT_CONTROL_IS_EXECUTING_OFFSET,
ARM_CONTEXT_CONTROL_IS_EXECUTING_OFFSET
);
#endif
RTEMS_STATIC_ASSERT(
sizeof( CPU_Exception_frame ) == ARM_EXCEPTION_FRAME_SIZE,
ARM_EXCEPTION_FRAME_SIZE
);
RTEMS_STATIC_ASSERT(
offsetof( CPU_Exception_frame, register_sp )
== ARM_EXCEPTION_FRAME_REGISTER_SP_OFFSET,
ARM_EXCEPTION_FRAME_REGISTER_SP_OFFSET
);
RTEMS_STATIC_ASSERT(
sizeof( ARM_VFP_context ) == ARM_VFP_CONTEXT_SIZE,
ARM_VFP_CONTEXT_SIZE
);
#ifdef ARM_MULTILIB_ARCH_V4
/*
* This variable can be used to change the running mode of the execution
* contexts.
*/
uint32_t arm_cpu_mode = 0x13;
void _CPU_Context_Initialize(
Context_Control *the_context,
void *stack_area_begin,
size_t stack_area_size,
uint32_t new_level,
void (*entry_point)( void ),
bool is_fp,
void *tls_area
)
{
the_context->register_sp = (uint32_t) stack_area_begin + stack_area_size;
the_context->register_lr = (uint32_t) entry_point;
the_context->register_cpsr = ( ( new_level != 0 ) ? ARM_PSR_I : 0 )
| arm_cpu_mode;
#ifdef ARM_MULTILIB_HAS_THREAD_ID_REGISTER
the_context->thread_id = (uint32_t) tls_area;
#endif
#ifdef RTEMS_SMP
the_context->is_executing = false;
#endif
if ( tls_area != NULL ) {
_TLS_TCB_at_area_begin_initialize( tls_area );
}
}
/* Preprocessor magic for stringification of x */
#define _CPU_ISR_LEVEL_DO_STRINGOF( x) #x
#define _CPU_ISR_LEVEL_STRINGOF( x) _CPU_ISR_LEVEL_DO_STRINGOF( x)
void _CPU_ISR_Set_level( uint32_t level )
{
uint32_t arm_switch_reg;
level = ( level != 0 ) ? ARM_PSR_I : 0;
__asm__ volatile (
ARM_SWITCH_TO_ARM
"mrs %[arm_switch_reg], cpsr\n"
"bic %[arm_switch_reg], #" _CPU_ISR_LEVEL_STRINGOF( ARM_PSR_I ) "\n"
"orr %[arm_switch_reg], %[level]\n"
"msr cpsr, %0\n"
ARM_SWITCH_BACK
: [arm_switch_reg] "=&r" (arm_switch_reg)
: [level] "r" (level)
);
}
uint32_t _CPU_ISR_Get_level( void )
{
ARM_SWITCH_REGISTERS;
uint32_t level;
__asm__ volatile (
ARM_SWITCH_TO_ARM
"mrs %[level], cpsr\n"
"and %[level], #" _CPU_ISR_LEVEL_STRINGOF( ARM_PSR_I ) "\n"
ARM_SWITCH_BACK
: [level] "=&r" (level) ARM_SWITCH_ADDITIONAL_OUTPUT
);
return ( level & ARM_PSR_I ) != 0;
}
void _CPU_ISR_install_vector(
uint32_t vector,
proc_ptr new_handler,
proc_ptr *old_handler
)
{
/* Redirection table starts at the end of the vector table */
volatile uint32_t *table = (volatile uint32_t *) (MAX_EXCEPTIONS * 4);
uint32_t current_handler = table [vector];
/* The current handler is now the old one */
if (old_handler != NULL) {
*old_handler = (proc_ptr) current_handler;
}
/* Write only if necessary to avoid writes to a maybe read-only memory */
if (current_handler != (uint32_t) new_handler) {
table [vector] = (uint32_t) new_handler;
}
}
void _CPU_Initialize( void )
{
/* Do nothing */
}
#endif /* ARM_MULTILIB_ARCH_V4 */
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