mem_op.h

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/*
 * (c) 2010 Author(s)
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 */
#ifndef __L4SYS__INCLUDE__ARCH_ARM__MEM_OP_H__
#define __L4SYS__INCLUDE__ARCH_ARM__MEM_OP_H__
 
#include <l4/sys/compiler.h>
#include <l4/sys/syscall_defs.h>
 
EXTERN_C_BEGIN
 
enum L4_mem_op_widths
{
  L4_MEM_WIDTH_1BYTE = 0, 
  L4_MEM_WIDTH_2BYTE = 1, 
  L4_MEM_WIDTH_4BYTE = 2, 
};
 
L4_INLINE unsigned long
l4_mem_read(unsigned long virtaddress, unsigned width);
 
L4_INLINE void
l4_mem_write(unsigned long virtaddress, unsigned width,
             unsigned long value);
 
enum L4_mem_ops
{
  L4_MEM_OP_MEM_READ  = 0x10,
  L4_MEM_OP_MEM_WRITE = 0x11,
};
 
L4_INLINE unsigned long
l4_mem_arm_op_call(unsigned long op,
                   unsigned long va,
                   unsigned long width,
                   unsigned long value);
 
L4_INLINE unsigned long
l4_mem_arm_op_call(unsigned long op,
                   unsigned long va,
                   unsigned long width,
                   unsigned long value)
{
  register unsigned long _op    __asm__ ("r0") = op;
  register unsigned long _va    __asm__ ("r1") = va;
  register unsigned long _width __asm__ ("r2") = width;
  register unsigned long _value __asm__ ("r3") = value;
 
  __asm__ __volatile__
    ("@ l4_cache_op_arm_call(start) \n\t"
     "mov     r5, %[sc]             \n\t"
     "blx     __l4_sys_syscall      \n\t"
     "@ l4_cache_op_arm_call(end)   \n\t"
       :
  "=r" (_op),
  "=r" (_va),
  "=r" (_width),
        "=r" (_value)
       :
       [sc] "i" (L4_SYSCALL_MEM_OP),
  "0" (_op),
  "1" (_va),
  "2" (_width),
        "3" (_value)
       :
  "cc", "memory", "r5", "ip", "lr"
       );
 
  return _value;
}
 
L4_INLINE unsigned long
l4_mem_read(unsigned long virtaddress, unsigned width)
{
  return l4_mem_arm_op_call(L4_MEM_OP_MEM_READ, virtaddress, width, 0);
}
 
L4_INLINE void
l4_mem_write(unsigned long virtaddress, unsigned width,
             unsigned long value)
{
  l4_mem_arm_op_call(L4_MEM_OP_MEM_WRITE, virtaddress, width, value);
}
 
EXTERN_C_END
 
#endif /* ! __L4SYS__INCLUDE__ARCH_ARM__MEM_OP_H__ */