/* * Copyright 2009 Red Hat Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Dave Airlie */#ifndef DRM_FIXED_H#define DRM_FIXED_H typedef union dfixed {	u32 full;} fixed20_12;  #define dfixed_const(A) (u32)(((A) << 12))/*  + ((B + 0.000122)*4096)) */#define dfixed_const_half(A) (u32)(((A) << 12) + 2048)#define dfixed_const_666(A) (u32)(((A) << 12) + 2731)#define dfixed_const_8(A) (u32)(((A) << 12) + 3277)#define dfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12)#define dfixed_init(A) { .full = dfixed_const((A)) }#define dfixed_init_half(A) { .full = dfixed_const_half((A)) }#define dfixed_trunc(A) ((A).full >> 12)#define dfixed_frac(A) ((A).full & ((1 << 12) - 1)) static inline u32 dfixed_floor(fixed20_12 A){	u32 non_frac = dfixed_trunc(A); 	return dfixed_const(non_frac);} static inline u32 dfixed_ceil(fixed20_12 A){	u32 non_frac = dfixed_trunc(A); 	if (A.full > dfixed_const(non_frac))		return dfixed_const(non_frac + 1);	else		return dfixed_const(non_frac);} static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B){	u64 tmp = ((u64)A.full << 13); 	do_div(tmp, B.full);	tmp += 1;	tmp /= 2;	return lower_32_bits(tmp);}#endif