cpu.h

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/*
 *  Copyright (c) 2011 embedded brains GmbH
 *
 *  Copyright (c) 2006 Kolja Waschk (rtemsdev/ixo.de)
 *
 *  COPYRIGHT (c) 1989-2004.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  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.
 */

#ifndef _RTEMS_SCORE_CPU_H
#define _RTEMS_SCORE_CPU_H

#ifdef __cplusplus
extern "C" {
#endif

#include <rtems/score/basedefs.h>
#include <rtems/score/nios2.h>

#define CPU_SIMPLE_VECTORED_INTERRUPTS TRUE

#define CPU_INTERRUPT_NUMBER_OF_VECTORS 32

#define CPU_INTERRUPT_MAXIMUM_VECTOR_NUMBER (CPU_INTERRUPT_NUMBER_OF_VECTORS - 1)

#define CPU_PROVIDES_ISR_IS_IN_PROGRESS TRUE

#define CPU_ISR_PASSES_FRAME_POINTER FALSE

#define CPU_HARDWARE_FP FALSE

#define CPU_SOFTWARE_FP FALSE

#define CPU_CONTEXT_FP_SIZE 0

#define CPU_ALL_TASKS_ARE_FP FALSE

#define CPU_IDLE_TASK_IS_FP FALSE

#define CPU_USE_DEFERRED_FP_SWITCH FALSE

#define CPU_ENABLE_ROBUST_THREAD_DISPATCH FALSE

#define CPU_STACK_GROWS_UP FALSE

/* FIXME: Is this the right value? */
#define CPU_CACHE_LINE_BYTES 32

#define CPU_STRUCTURE_ALIGNMENT \
  RTEMS_SECTION( ".sdata" ) RTEMS_ALIGNED( CPU_CACHE_LINE_BYTES )

#define CPU_STACK_MINIMUM_SIZE (4 * 1024)

#define CPU_SIZEOF_POINTER 4

/*
 * Alignment value according to "Nios II Processor Reference" chapter 7
 * "Application Binary Interface" section "Memory Alignment".
 */
#define CPU_ALIGNMENT 4

#define CPU_HEAP_ALIGNMENT CPU_ALIGNMENT

/*
 * Alignment value according to "Nios II Processor Reference" chapter 7
 * "Application Binary Interface" section "Stacks".
 */
#define CPU_STACK_ALIGNMENT 4

#define CPU_INTERRUPT_STACK_ALIGNMENT CPU_CACHE_LINE_BYTES

/*
 * A Nios II configuration with an external interrupt controller (EIC) supports
 * up to 64 interrupt levels.  A Nios II configuration with an internal
 * interrupt controller (IIC) has only two interrupt levels (enabled and
 * disabled).  The _CPU_ISR_Get_level() and _CPU_ISR_Set_level() functions will
 * take care about configuration specific mappings.
 */
#define CPU_MODES_INTERRUPT_MASK 0x3f

#define CPU_USE_GENERIC_BITFIELD_CODE TRUE

#define CPU_MPCI_RECEIVE_SERVER_EXTRA_STACK 0

#define CPU_MAXIMUM_PROCESSORS 32

#ifndef ASM

typedef struct {
  uint32_t r16;
  uint32_t r17;
  uint32_t r18;
  uint32_t r19;
  uint32_t r20;
  uint32_t r21;
  uint32_t r22;
  uint32_t r23;
  uint32_t fp;
  uint32_t status;
  uint32_t sp;
  uint32_t ra;
  uint32_t thread_dispatch_disabled;
  uint32_t stack_mpubase;
  uint32_t stack_mpuacc;
} Context_Control;

#define _CPU_Context_Get_SP( _context ) \
  (_context)->sp

typedef void CPU_Interrupt_frame;

typedef struct {
  uint32_t r1;
  uint32_t r2;
  uint32_t r3;
  uint32_t r4;
  uint32_t r5;
  uint32_t r6;
  uint32_t r7;
  uint32_t r8;
  uint32_t r9;
  uint32_t r10;
  uint32_t r11;
  uint32_t r12;
  uint32_t r13;
  uint32_t r14;
  uint32_t r15;
  uint32_t r16;
  uint32_t r17;
  uint32_t r18;
  uint32_t r19;
  uint32_t r20;
  uint32_t r21;
  uint32_t r22;
  uint32_t r23;
  uint32_t gp;
  uint32_t fp;
  uint32_t sp;
  uint32_t ra;
  uint32_t et;
  uint32_t ea;
  uint32_t status;
  uint32_t ienable;
  uint32_t ipending;
} CPU_Exception_frame;

#define _CPU_Initialize_vectors()

#define _CPU_ISR_Disable( _isr_cookie ) \
  do { \
    int _tmp; \
    __asm__ volatile ( \
      "rdctl %0, status\n" \
      "movhi %1, %%hiadj(_Nios2_ISR_Status_mask)\n" \
      "addi %1, %1, %%lo(_Nios2_ISR_Status_mask)\n" \
      "and %1, %0, %1\n" \
      "ori %1, %1, %%lo(_Nios2_ISR_Status_bits)\n" \
      "wrctl status, %1" \
      : "=&r" (_isr_cookie), "=&r" (_tmp) \
    ); \
  } while ( 0 )

#define _CPU_ISR_Enable( _isr_cookie ) \
  __builtin_wrctl( 0, (int) _isr_cookie )

#define _CPU_ISR_Flash( _isr_cookie ) \
  do { \
    int _status = __builtin_rdctl( 0 ); \
    __builtin_wrctl( 0, (int) _isr_cookie ); \
    __builtin_wrctl( 0, _status ); \
  } while ( 0 )

bool _CPU_ISR_Is_enabled( uint32_t level );

void _CPU_ISR_Set_level( uint32_t new_level );

uint32_t _CPU_ISR_Get_level( void );

void _CPU_Context_Initialize(
  Context_Control *context,
  void *stack_area_begin,
  size_t stack_area_size,
  uint32_t new_level,
  void (*entry_point)( void ),
  bool is_fp,
  void *tls_area
);

#define _CPU_Context_Restart_self( _the_context ) \
  _CPU_Context_restore( (_the_context) );

void _CPU_Fatal_halt( uint32_t _source, uint32_t _error )
  RTEMS_NO_RETURN;

void _CPU_Initialize( void );

typedef void ( *CPU_ISR_handler )( uint32_t );

void _CPU_ISR_install_vector(
  uint32_t         vector,
  CPU_ISR_handler  new_handler,
  CPU_ISR_handler *old_handler
);

void *_CPU_Thread_Idle_body( uintptr_t ignored );

void _CPU_Context_switch( Context_Control *run, Context_Control *heir );

void _CPU_Context_restore(
  Context_Control *new_context
) RTEMS_NO_RETURN;

void _CPU_Exception_frame_print( const CPU_Exception_frame *frame );

static inline uint32_t CPU_swap_u32( uint32_t value )
{
  uint32_t byte1, byte2, byte3, byte4, swapped;

  byte4 = (value >> 24) & 0xff;
  byte3 = (value >> 16) & 0xff;
  byte2 = (value >> 8)  & 0xff;
  byte1 =  value        & 0xff;

  swapped = (byte1 << 24) | (byte2 << 16) | (byte3 << 8) | byte4;

  return swapped;
}

#define CPU_swap_u16( value ) \
  (((value&0xff) << 8) | ((value >> 8)&0xff))

typedef uint32_t CPU_Counter_ticks;

uint32_t _CPU_Counter_frequency( void );

CPU_Counter_ticks _CPU_Counter_read( void );

static inline CPU_Counter_ticks _CPU_Counter_difference(
  CPU_Counter_ticks second,
  CPU_Counter_ticks first
)
{
  return second - first;
}

typedef uintptr_t CPU_Uint32ptr;

#endif /* ASM */

#ifdef __cplusplus
}
#endif

#endif