1254853Sdumbbell/* 2254853Sdumbbell * Copyright 2009 Red Hat Inc. 3254853Sdumbbell * 4254853Sdumbbell * Permission is hereby granted, free of charge, to any person obtaining a 5254853Sdumbbell * copy of this software and associated documentation files (the "Software"), 6254853Sdumbbell * to deal in the Software without restriction, including without limitation 7254853Sdumbbell * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8254853Sdumbbell * and/or sell copies of the Software, and to permit persons to whom the 9254853Sdumbbell * Software is furnished to do so, subject to the following conditions: 10254853Sdumbbell * 11254853Sdumbbell * The above copyright notice and this permission notice shall be included in 12254853Sdumbbell * all copies or substantial portions of the Software. 13254853Sdumbbell * 14254853Sdumbbell * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15254853Sdumbbell * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16254853Sdumbbell * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17254853Sdumbbell * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18254853Sdumbbell * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19254853Sdumbbell * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20254853Sdumbbell * OTHER DEALINGS IN THE SOFTWARE. 21254853Sdumbbell * 22254853Sdumbbell * Authors: Dave Airlie 23254853Sdumbbell */ 24254853Sdumbbell 25254853Sdumbbell#include <sys/cdefs.h> 26254853Sdumbbell__FBSDID("$FreeBSD$"); 27254853Sdumbbell 28254853Sdumbbell#ifndef DRM_FIXED_H 29254853Sdumbbell#define DRM_FIXED_H 30254853Sdumbbell 31254853Sdumbbelltypedef union dfixed { 32254853Sdumbbell u32 full; 33254853Sdumbbell} fixed20_12; 34254853Sdumbbell 35254853Sdumbbell 36254853Sdumbbell#define dfixed_const(A) (u32)(((A) << 12))/* + ((B + 0.000122)*4096)) */ 37254853Sdumbbell#define dfixed_const_half(A) (u32)(((A) << 12) + 2048) 38254853Sdumbbell#define dfixed_const_666(A) (u32)(((A) << 12) + 2731) 39254853Sdumbbell#define dfixed_const_8(A) (u32)(((A) << 12) + 3277) 40254853Sdumbbell#define dfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12) 41254853Sdumbbell#define dfixed_init(A) { .full = dfixed_const((A)) } 42254853Sdumbbell#define dfixed_init_half(A) { .full = dfixed_const_half((A)) } 43254853Sdumbbell#define dfixed_trunc(A) ((A).full >> 12) 44254853Sdumbbell#define dfixed_frac(A) ((A).full & ((1 << 12) - 1)) 45254853Sdumbbell 46254853Sdumbbellstatic inline u32 dfixed_floor(fixed20_12 A) 47254853Sdumbbell{ 48254853Sdumbbell u32 non_frac = dfixed_trunc(A); 49254853Sdumbbell 50254853Sdumbbell return dfixed_const(non_frac); 51254853Sdumbbell} 52254853Sdumbbell 53254853Sdumbbellstatic inline u32 dfixed_ceil(fixed20_12 A) 54254853Sdumbbell{ 55254853Sdumbbell u32 non_frac = dfixed_trunc(A); 56254853Sdumbbell 57254853Sdumbbell if (A.full > dfixed_const(non_frac)) 58254853Sdumbbell return dfixed_const(non_frac + 1); 59254853Sdumbbell else 60254853Sdumbbell return dfixed_const(non_frac); 61254853Sdumbbell} 62254853Sdumbbell 63254853Sdumbbellstatic inline u32 dfixed_div(fixed20_12 A, fixed20_12 B) 64254853Sdumbbell{ 65254853Sdumbbell u64 tmp = ((u64)A.full << 13); 66254853Sdumbbell 67254853Sdumbbell do_div(tmp, B.full); 68254853Sdumbbell tmp += 1; 69254853Sdumbbell tmp /= 2; 70254853Sdumbbell return lower_32_bits(tmp); 71254853Sdumbbell} 72254853Sdumbbell#endif 73