Functions | |
PAL_CALL_RETURN EFIAPI | PalCall (IN UINT64 Index, IN UINT64 Arg2, IN UINT64 Arg3, IN UINT64 Arg4) |
The PAL Library provides a service to make a PAL CALL. This service is identical in functionality to AsmPalCall() in the functions of the Base Library specific to Intel Itanium architecture. The only difference is that the PAL Entry Point is not passed in. Implementations of this library class must manage PAL Entry Point on their own. For example, a PEI implementation can use a PPI to lookup the PAL Entry Point, and a DXE implementation can contain a constructor to look up the PAL Entry Point from a HOB. This library class is only available on Intel Itanium-based platforms.
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PAL_CALL_RETURN EFIAPI PalCall | ( | IN UINT64 | Index, | |
IN UINT64 | Arg2, | |||
IN UINT64 | Arg3, | |||
IN UINT64 | Arg4 | |||
) |
Makes a PAL procedure call.
This is a wrapper function to make a PAL procedure call. Based on the Index value, this API will make static or stacked PAL call. Architected procedures may be designated as required or optional. If a PAL procedure is specified as optional, a unique return code of 0xFFFFFFFFFFFFFFFF is returned in the Status field of the PAL_CALL_RETURN structure. This indicates that the procedure is not present in this PAL implementation. It is the caller's responsibility to check for this return code after calling any optional PAL procedure. No parameter checking is performed on the 4 input parameters, but there are some common rules that the caller should follow when making a PAL call. Any address passed to PAL as buffers for return parameters must be 8-byte aligned. Unaligned addresses may cause undefined results. For those parameters defined as reserved or some fields defined as reserved must be zero filled or the invalid argument return value may be returned or undefined result may occur during the execution of the procedure. This function is only available on Intel Itanium-based platforms.
Index | The PAL procedure Index number. | |
Arg2 | The 2nd parameter for PAL procedure calls. | |
Arg3 | The 3rd parameter for PAL procedure calls. | |
Arg4 | The 4th parameter for PAL procedure calls. |