=> R0 = buffer handle
R1 = EOR mask
R2 = AND mask
<= R1 = old flags
R2 = new flags
This SWI modifies the buffer's flag word.
NewVal = (OldVal AND R2) EOR R1
Ensure that you do not modify reserved bits with this call - reserved bits should be clear in R1, set in R2.
To read: R1 = 0 R2 = &0000000F
To set: R1 = new value R2 = &FFFFFFF0
See PRM 4, page 92.
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