#include <linux/config.h>#include <asm/ppc_asm.h>#include <asm/reg.h> /* * The routines below are in assembler so we can closely control the * usage of floating-point registers.  These routines must be called * with preempt disabled. */#ifdef CONFIG_PPC32	.datafpzero:	.long	0fpone:	.long	0x3f800000	/* 1.0 in single-precision FP */fphalf:	.long	0x3f000000	/* 0.5 in single-precision FP */ #define LDCONST(fr, name)	\	lis	r11,name@ha;	\	lfs	fr,name@l(r11)#else 	.section ".toc","aw"fpzero:	.tc	FD_0_0[TC],0fpone:	.tc	FD_3ff00000_0[TC],0x3ff0000000000000	/* 1.0 */fphalf:	.tc	FD_3fe00000_0[TC],0x3fe0000000000000	/* 0.5 */ #define LDCONST(fr, name)	\	lfd	fr,name@toc(r2)#endif 	.text/* * Internal routine to enable floating point and set FPSCR to 0. * Don't call it from C; it doesn't use the normal calling convention. */fpenable:#ifdef CONFIG_PPC32	stwu	r1,-64(r1)#else	stdu	r1,-64(r1)#endif	mfmsr	r10	ori	r11,r10,MSR_FP	mtmsr	r11	isync	stfd	fr0,24(r1)	stfd	fr1,16(r1)	stfd	fr31,8(r1)	LDCONST(fr1, fpzero)	mffs	fr31	mtfsf	0xff,fr1	blr fpdisable:	mtlr	r12	mtfsf	0xff,fr31	lfd	fr31,8(r1)	lfd	fr1,16(r1)	lfd	fr0,24(r1)	mtmsr	r10	isync	addi	r1,r1,64	blr /* * Vector add, floating point. */_GLOBAL(vaddfp)	mflr	r12	bl	fpenable	li	r0,4	mtctr	r0	li	r6,01:	lfsx	fr0,r4,r6	lfsx	fr1,r5,r6	fadds	fr0,fr0,fr1	stfsx	fr0,r3,r6	addi	r6,r6,4	bdnz	1b	b	fpdisable /* * Vector subtract, floating point. */_GLOBAL(vsubfp)	mflr	r12	bl	fpenable	li	r0,4	mtctr	r0	li	r6,01:	lfsx	fr0,r4,r6	lfsx	fr1,r5,r6	fsubs	fr0,fr0,fr1	stfsx	fr0,r3,r6	addi	r6,r6,4	bdnz	1b	b	fpdisable /* * Vector multiply and add, floating point. */_GLOBAL(vmaddfp)	mflr	r12	bl	fpenable	stfd	fr2,32(r1)	li	r0,4	mtctr	r0	li	r7,01:	lfsx	fr0,r4,r7	lfsx	fr1,r5,r7	lfsx	fr2,r6,r7	fmadds	fr0,fr0,fr2,fr1	stfsx	fr0,r3,r7	addi	r7,r7,4	bdnz	1b	lfd	fr2,32(r1)	b	fpdisable /* * Vector negative multiply and subtract, floating point. */_GLOBAL(vnmsubfp)	mflr	r12	bl	fpenable	stfd	fr2,32(r1)	li	r0,4	mtctr	r0	li	r7,01:	lfsx	fr0,r4,r7	lfsx	fr1,r5,r7	lfsx	fr2,r6,r7	fnmsubs	fr0,fr0,fr2,fr1	stfsx	fr0,r3,r7	addi	r7,r7,4	bdnz	1b	lfd	fr2,32(r1)	b	fpdisable /* * Vector reciprocal estimate.  We just compute 1.0/x. * r3 -> destination, r4 -> source. */_GLOBAL(vrefp)	mflr	r12	bl	fpenable	li	r0,4	LDCONST(fr1, fpone)	mtctr	r0	li	r6,01:	lfsx	fr0,r4,r6	fdivs	fr0,fr1,fr0	stfsx	fr0,r3,r6	addi	r6,r6,4	bdnz	1b	b	fpdisable /* * Vector reciprocal square-root estimate, floating point. * We use the frsqrte instruction for the initial estimate followed * by 2 iterations of Newton-Raphson to get sufficient accuracy. * r3 -> destination, r4 -> source. */_GLOBAL(vrsqrtefp)	mflr	r12	bl	fpenable	stfd	fr2,32(r1)	stfd	fr3,40(r1)	stfd	fr4,48(r1)	stfd	fr5,56(r1)	li	r0,4	LDCONST(fr4, fpone)	LDCONST(fr5, fphalf)	mtctr	r0	li	r6,01:	lfsx	fr0,r4,r6	frsqrte	fr1,fr0		/* r = frsqrte(s) */	fmuls	fr3,fr1,fr0	/* r * s */	fmuls	fr2,fr1,fr5	/* r * 0.5 */	fnmsubs	fr3,fr1,fr3,fr4	/* 1 - s * r * r */	fmadds	fr1,fr2,fr3,fr1	/* r = r + 0.5 * r * (1 - s * r * r) */	fmuls	fr3,fr1,fr0	/* r * s */	fmuls	fr2,fr1,fr5	/* r * 0.5 */	fnmsubs	fr3,fr1,fr3,fr4	/* 1 - s * r * r */	fmadds	fr1,fr2,fr3,fr1	/* r = r + 0.5 * r * (1 - s * r * r) */	stfsx	fr1,r3,r6	addi	r6,r6,4	bdnz	1b	lfd	fr5,56(r1)	lfd	fr4,48(r1)	lfd	fr3,40(r1)	lfd	fr2,32(r1)	b	fpdisable