On 20/01/15 17:41, Julien Grall wrote: > Hi Ian, > > On 20/01/15 15:57, Ian Campbell wrote: >> On Mon, 2015-01-19 at 16:29 +0000, Julien Grall wrote: >>> In general, it's not necessary/important to check the size. >> >> Only if the docs say this register can be accessed by a partial >> read/write, or if it is implementation defined what the result would be >> (and RAZ/WI is within the set of allowable actions). >> >> Do you have a reference for the behaviour of GICR accesses which aren't >> of the register's natural size? > > It's clearly specify in the spec if the register can be accessed with a > non-natural size. > > AFAICT, the spec doesn't give a specific behavior if the register > doesn't support byte/word/double word access.
Hmmm, I read quickly the spec. 5.1.3 says: "Accessing any of these registers using other accesses is UNPREDICTABLE". So I think it's fine to go on this behavior. It would help to have a simpler code. Regards, -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
