Intel manual VxWorks* Considerations, Intel IXP400 Software Macros, Endian Conversion Macros

Intel® IXP400 Software

Endianness in Intel® IXP400 Software

\vxworks\include\platforms\ixp400 \IxOsalOsIxp400CustomizedMappings.h. Further information on the VxWorks memory map is available in the VxWorks BSP documentation for the supported development platforms. Depending on their implementations, other operating systems may provide similar files/documents.

The macros shown in “Intel® IXP400 Software Macros” on page 362 are provided for use in the IXP400 software components. The defines are correct for software release 2.0, but may change for other releases.

Table 67. Intel® IXP400 Software Macros

#defines

#IX_OSAL_BE #IX_OSAL_LE_AC #IX_OSAL_LE_DC

Table 68 shows the endian conversion macros that need to be mapped for developer usage.

Table 68. Endian Conversion Macros

Macro	Behavior	Description
BE_XSTOBUSL()	No swap	Big-Endian XScale to Bus Long
BE_XSTOBUSS()	No swap	Big-Endian XScale to Bus Short
BE_BUSTOXSL()	No swap	Big-Endian Bus to XScale Long
BE_BUSTOXSS()	No swap	Big-Endian Bus to XScale Short
LE_AC_ XSTOBUSL()	No swap	Little-Endian Address Coherent XScale to Bus Long
LE_AC_	Address Swap	Little-Endian Address Coherent XScale to Bus Short
XSTOBUSS()
LE_AC_ BUSTOXSL()	No swap	Little-Endian Address Coherent Bus to XScale Long
LE_AC_	Address Swap	Little-Endian Address Coherent Bus to XScale Short
BUSTOXSS()
LE_DC_ XSTOBUSL()	Data Word swap	Little-Endian Data Coherent XScale to Bus Long
LE_DC_	½ Data Word swap	Little-Endian Data Coherent Bus to XScale Short
XSTOBUSS()
LE_DC_ BUSTOXSL()	Data Word swap	Little-Endian Data Coherent Bus to XScale Long
LE_DC_	½ Data Word swap	Little-Endian Data Coherent XScale to Bus Short
BUSTOXSS()

27.5.6VxWorks* Considerations

Both the AHB Queue Manager and NPE debug control registers (NPE message handler component ixNpeMh) are placed in Data Coherent Little-Endian mode. As the NPE debug registers are in APB space, and other APB registers are mapped in Address Coherent mode, a Data Coherent alias for the APB bus is defined.

April 2005	IXP400 Software Version 2.0	Programmer’s Guide
362	Document Number: 252539, Revision: 007