Read modify write
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November 30, 2009
Published by Gary Stringham at November 30, 2009
Categories
In registers containing several read/write configuration bits, a device driver often needs to change one bit without changing the others. One technique is for the device driver to keep a shadow copy of that register in its own data structures. The device driver modifies the desired bit in its copy, […]
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December 31, 2009
Published by Gary Stringham at December 31, 2009
Categories
In last month’s article, I discussed the dangers of read-modify-write operations when multiple device drivers access the same hardware registers, since basic firmware read-modify-write operations are not atomic. I also discussed how firmware techniques such as shadow copies and mutexes can be used to provide atomic read-modify-write operations, but only […]
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