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File: [Development] / linux-2.6-xfs / arch / powerpc / math-emu / mcrfs.c (download)

Revision 1.2, Mon Aug 4 17:03:13 2008 UTC (9 years, 2 months ago) by lachlan.longdrop.melbourne.sgi.com
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +2 -2 lines 

Merge up to 2.6.26
Merge of 2.6.x-xfs-melb:linux:31804b by kenmcd.

#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", __func__, 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", __func__, *ccr);
#endif

	return 0;
}