On Mon, Apr 20, 2015 at 12:08 AM, Nicholas Krause <[email protected]> wrote:
> > > On April 19, 2015 5:13:20 PM EDT, Anuz Pratap Singh Tomar < > [email protected]> wrote: > >On Sun, Apr 19, 2015 at 9:51 PM, nick <[email protected]> wrote: > > > >> Greetings All, > >> I am wondering what the below code in the asm modifier does: > >> static inline void set_bit(int nr, void *addr) > >> { > >> asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr)); > >> } > >> This would be very helpful as I am new to x86 assembly and don't > >> even known what register(s)/instruction(s) this touches and therefore > >this > >> is impossible for me to look up in the Intel Manuals. If someone > >either > >> tells me the registers/instructions this uses or explains the code > >that > >> would be very helpful. > >> Nick > >> > >> _______________________________________________ > >> Kernelnewbies mailing list > >> [email protected] > >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >> > > > >get a book on i86 assembly and learn it. > The reason I am asking is that is assembly worth my time to learn for this > part of the kernel, I understand it's use in boot code but outside of that > and cache memory lines in architecture directories there is very little, 95 > percent of the kernel is written in C. In addition due to this the only > practical reason I can thing of is for > debugging, how useful is assembly for kernel debugging is my other > question about this topic. > Nick > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. > Just read the books, don't be lazy. -- Thank you Warm Regards Anuz
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