Messages in this thread | | | Date | Mon, 12 Jul 1999 17:27:43 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: 64 bit arithmetic in the kernel |
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On Mon, 12 Jul 1999, Michael Richardson wrote:
> > Is there any easy way to get things like the stuff that it > is in libgcc1.a into the Linux kernel? I have need for 64/32 integer divide > (gcc calls __udivdi3). > This is with 2.2.10, on a Lintel box, and I'm using a module. >
Use inline asm. In Intel, you put the high long-word into edx, the low long-word into eax, and "div" either by an immediate or something in, say the ecx register. The result is a long-word in eax, with the remainder in edx.
This results in an unsigned integer divide, which is what the __udivxxx means.
Cheers, Dick Johnson FILE SYSTEM MODIFIED Penguin : Linux version 2.2.6 on an i686 machine (400.59 BogoMips). Warning : It's hard to remain at the trailing edge of technology.
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