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IXP400 Software
Operating System Abstraction Layer (OSAL)
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
324 Document Number: 252539, Revision: 007
24.7 Supporting a New OS
Support for a new operating system can be added separately by creating a new OS-specific folder
under the “os” directory, with necessary modification to the core module and the build system to
expand the supported OS list. It is not required that a new OS be supported for all the OSAL
modules. Similarly, it is not required that supporting a new OS extends to the entire API within a
module. For example, the new OS might not support locking via mutexes or semaphores.
To preserve the modularity, it is recommended that any API implementation that can be reused for
another OS, and that exists in an OS-specific directory, be moved into the shared directory for the
other operating system.
Each software component using the OSAL I/O memory mapping and endianness support module
must define the following symbols:
• IX_OSAL_MEM_MAP_TYPE
This selects dynamic (IX_OSAL_DYNAMIC_MEM_MAP) or static
(IX_OSAL_STATIC_MEM_MAP) memory mapping (required for the IX_OSAL_READ/WRITE
macros) used by the software component.
Table 64. OSAL I/O Memory and Endianness Interface (Sheet 2 of 2)
IX_OSAL_SWAP_LONG 32-bit word byte swap
IX_OSAL_SWAP_SHORT 16-bit short byte swap
IX_OSAL_SWAP_SHORT_ADDR 16-bit short address swap
IX_OSAL_SWAP_BYTE_ADDR byte address swap
IX_OSAL_READ_BYTE I/O byte read
IX_OSAL_WRITE_BYTE I/O byte write
IX_OSAL_READ_SHORT I/O 16-bit short read
IX_OSAL_WRITE_SHORT I/O 16-bit short write
IX_OSAL_READ_LONG I/O 32-bit word read
I/O Read/Write
IX_OSAL_WRITE_LONG I/O 32-bit word write
IX_OSAL_WRITE_BE_SHARED_BYTE big endian byte write
IX_OSAL_WRITE_BE_SHARED_SHOR
T
big endian 16-bit short write
IX_OSAL_WRITE_BE_SHARED_LONG big endian 32-bit word write
IX_OSAL_READ_BE_SHARED_BYTE big endian byte read
IX_OSAL_READ_BE_SHARED_SHORT big endian 16-bit short read
IX_OSAL_READ_BE_SHARED_LONG big endian 32-bit word read
IX_OSAL_SWAP_BE_SHARED_SHORT big endian 16-bit short swap
IX_OSAL_SWAP_BE_SHARED_LONG big endian 32-bit word swap
Mixed endian systems
IX_OSAL_COPY_BE_SHARED_LONG_
ARRAY
big endian 32-bit word array copy