nuttx/arch/arm/include/arch.h

/****************************************************************************
 * arch/arm/include/arch.h
 *
 *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/* This file should never be included directed but, rather,
 * only indirectly through nuttx/arch.h
 */

#ifndef __ARCH_ARM_INCLUDE_ARCH_H
#define __ARCH_ARM_INCLUDE_ARCH_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

/****************************************************************************
 * Definitions
 ****************************************************************************/

/* This identifies the register the is used by the processor as the PIC base
 * register.  It is usually r9 or r10
 */

#define PIC_REG         r10
#define PIC_REG_STRING "r10"

/* Macros to get and set the PIC base register.  picbase is assumed to be
 * of type (void*) and that it will fit into a uint32.  These must be
 * inline so that they will be compatible with the ABIs rules for
 * preserving the PIC register
 */

#define up_getpicbase(ppicbase) \
do { \
  uint32 picbase; \
  __asm__ \
  ( \
    "\tmov %0, " PIC_REG_STRING "\n\t" \
    : "=r"(picbase) \
  ); \
  *ppicbase = (FAR void*)picbase; \
} while (0)

#define up_setpicbase(picbase) \
do { \
  uint32 _picbase = (uint32)picbase; \
  __asm__ \
  ( \
    "\tmov " PIC_REG_STRING ", %0\n\t" \
    : : "r"(_picbase) : PIC_REG_STRING \
  ); \
} while (0)


/****************************************************************************
 * Inline functions
 ****************************************************************************/

/****************************************************************************
 * Public Types
 ****************************************************************************/

/****************************************************************************
 * Public Variables
 ****************************************************************************/

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif

#undef EXTERN
#ifdef __cplusplus
}
#endif

#endif /* __ARCH_ARM_INCLUDE_ARCH_H */