Date: Sun, 18 Feb 1996 16:41:52 +1100 From: Bruce Evans <bde@zeta.org.au> To: freebsd-hackers@freebsd.org, koshy@india.hp.com Subject: Re: Doing a rep movsw Message-ID: <199602180541.QAA28125@godzilla.zeta.org.au>
next in thread | raw e-mail | index | archive | help
>How can one perform a "rep movsw" in Gcc? I saw inline code to do a "rep insw"
asm("rep movsw") :-).
>in machine/cpufunc.h --- is there an equivalent inline macro for "movsw"
>that I've missed out?
No.
>I cannot use `bcopy' here because I am trying to access a memory mapped I/O
>port which requires word accesses (no 8/32 bit accesses are permitted).
There used to be a bcopyw for this.
Write it in C. "rep movs" isn't very efficient (it shouldn't be used to
implement bcopy except possibly on 386's), and for memory mapped i/o you
will probably be waiting for the i/o.
Bruce
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199602180541.QAA28125>