Buffer_ModifyFlags
BufferManager
» SWI Calls
» Buffer_ModifyFlags
Buffer_ModifyFlags
(SWI &42944)
| Entry | |
|---|---|
| R0 | Buffer handle |
| R1 | EOR mask |
| R2 | AND mask |
| Exit | |
|---|---|
| R1 | Old flags |
| R2 | New flags |
Use
This SWI modifies the buffer’s flags, according to the following:
NewVal = ( OldVal AND R2 ) EOR R1
To read: R1 = 0, R2 = &0000000F
To set: R1 = new value, R2 = &FFFFFFF0
Notes
Ensure that you do not modify reserved bits with this call. Any reserved bits should be clear in R1, set in R2.
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