Kristen Carlson Accardi wrote:
On Tue, 25 Sep 2007 01:12:32 +0200
roel <[email protected]> wrote:
#define ata_id_cdb_intr(id) (((id)[0] & 0x60) == 0x20)
+#define ata_id_has_hipm(id) \
+ ( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
+ ((id)[76] & (1 << 9)) )
^
|
are you sure this
should be 76?
Yes.
we can also change the first statement a bit:
(!(((id)[76] == 0x0000) || ((id)[76] == 0xffff)) && \
+#define ata_id_has_dipm(id) \
+ ( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
and:
(!(((id)[76] == 0x0000) || ((id)[76] == 0xffff)) && \
I feel this is equivalent functionality and not as readable.
Poke around for Alan Cox's cleanup of this area of linux/ata.h.
It converts several macros to inline functions (encouraged), and also
illustrates a nice, clean way of testing an ID word's validity.
[obviously the final implementation varies, depending on that ID word's
history]
Alan or Andrew, got a copy somewhere? My feeble search skills don't
seem to turn it up at the moment, even though I had a copy in my hands
quite recently.
Jeff
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