kernel-ark/arch/ppc/math-emu/mcrfs.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

32 lines
552 B
C

#include <linux/types.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
#include "soft-fp.h"
int
mcrfs(u32 *ccr, u32 crfD, u32 crfS)
{
u32 value, clear;
#ifdef DEBUG
printk("%s: %p (%08x) %d %d\n", __FUNCTION__, ccr, *ccr, crfD, crfS);
#endif
clear = 15 << ((7 - crfS) << 2);
if (!crfS)
clear = 0x90000000;
value = (__FPU_FPSCR >> ((7 - crfS) << 2)) & 15;
__FPU_FPSCR &= ~(clear);
*ccr &= ~(15 << ((7 - crfD) << 2));
*ccr |= (value << ((7 - crfD) << 2));
#ifdef DEBUG
printk("CR: %08x\n", __FUNCTION__, *ccr);
#endif
return 0;
}