This tool is meant to be run from the UEFI Shell, and will set shell environment variables to quickly test for and look up EFI return statuses and error codes.
Usage:
fs16:> ShellErrVars.efi [-i]
A few examples of what gets set:
evar_RETURN_SUCCESS = 0x0
evar_0x0 = RETURN_SUCCESS
svar_RETURN_SUCCESS = 0x0
svar_0x0 = RETURN_SUCCESS
...
evar_RETURN_HTTP_ERROR = 0x23
evar_0x23 = RETURN_HTTP_ERROR
svar_RETURN_HTTP_ERROR = 0x8000000000000023
svar_0x8000000000000023 = RETURN_HTTP_ERROR
...
wvar_RETURN_WARN_WRITE_FAILURE = 0x3
wvar_0x3 = RETURN_WARN_WRITE_FAILURE
svar_RETURN_WARN_WRITE_FAILURE = 0x3
svar_0x3 = RETURN_WARN_WRITE_FAILURE
svar_ refers to the raw RETURN_STATUS value, while
evar_ will strip the high error bit, since that's
the way the UEFI Shell %lasterror% reports status.
Note: svar_, wvar_ and reverse (value to name) variables
are only set with the -i (interactive) flag, as they
are mostly useless in a script setting. Sadly, the UEFI shell is too
dumb to do double expansion.
Examples of use:
FS1:\> echo %evar_0x0%
RETURN_SUCCESS
FS1:\> echo %evar_0xE%
RETURN_NOT_FOUND
FS1:\> echo %svar_RETURN_NOT_FOUND%
0x800000000000000E
In a script:
if x%lasterror% eq x%evar_RETURN_NOT_FOUND%
echo Something wasn't found.
endif