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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260/* * 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 * Christian König */#ifndef DRM_FIXED_H#define DRM_FIXED_H
#include <linux/math64.h>#include <linux/types.h>#include <linux/wordpart.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);}
#define DRM_FIXED_POINT 32#define DRM_FIXED_ONE (1ULL << DRM_FIXED_POINT)#define DRM_FIXED_DECIMAL_MASK (DRM_FIXED_ONE - 1)#define DRM_FIXED_DIGITS_MASK (~DRM_FIXED_DECIMAL_MASK)#define DRM_FIXED_EPSILON 1LL#define DRM_FIXED_ALMOST_ONE (DRM_FIXED_ONE - DRM_FIXED_EPSILON)
/** * drm_sm2fixp() - convert signed-magnitude to fixed point * @a: 1.31.32 signed-magnitude fixed point * * Convert a 1.31.32 signed-magnitude fixed point to 32.32 * 2s-complement fixed point * * @return s64 2s-complement fixed point */static inline s64 drm_sm2fixp(__u64 a){ if ((a & (1LL << 63))) { return -(a & 0x7fffffffffffffffll); } else { return a; }}
static inline s64 drm_int2fixp(int a){ return ((s64)a) << DRM_FIXED_POINT;}
static inline int drm_fixp2int(s64 a){ return ((s64)a) >> DRM_FIXED_POINT;}
static inline int drm_fixp2int_round(s64 a){ return drm_fixp2int(a + DRM_FIXED_ONE / 2);}
static inline int drm_fixp2int_ceil(s64 a){ if (a >= 0) return drm_fixp2int(a + DRM_FIXED_ALMOST_ONE); else return drm_fixp2int(a - DRM_FIXED_ALMOST_ONE);}
static inline unsigned drm_fixp_msbset(s64 a){ unsigned shift, sign = (a >> 63) & 1;
for (shift = 62; shift > 0; --shift) if (((a >> shift) & 1) != sign) return shift;
return 0;}
static inline s64 drm_fixp_mul(s64 a, s64 b){ unsigned shift = drm_fixp_msbset(a) + drm_fixp_msbset(b); s64 result;
if (shift > 61) { shift = shift - 61; a >>= (shift >> 1) + (shift & 1); b >>= shift >> 1; } else shift = 0;
result = a * b;
if (shift > DRM_FIXED_POINT) return result << (shift - DRM_FIXED_POINT);
if (shift < DRM_FIXED_POINT) return result >> (DRM_FIXED_POINT - shift);
return result;}
static inline s64 drm_fixp_div(s64 a, s64 b){ unsigned shift = 62 - drm_fixp_msbset(a); s64 result;
a <<= shift;
if (shift < DRM_FIXED_POINT) b >>= (DRM_FIXED_POINT - shift);
result = div64_s64(a, b);
if (shift > DRM_FIXED_POINT) return result >> (shift - DRM_FIXED_POINT);
return result;}
static inline s64 drm_fixp_from_fraction(s64 a, s64 b){ s64 res; bool a_neg = a < 0; bool b_neg = b < 0; u64 a_abs = a_neg ? -a : a; u64 b_abs = b_neg ? -b : b; u64 rem;
/* determine integer part */ u64 res_abs = div64_u64_rem(a_abs, b_abs, &rem);
/* determine fractional part */ { u32 i = DRM_FIXED_POINT;
do { rem <<= 1; res_abs <<= 1; if (rem >= b_abs) { res_abs |= 1; rem -= b_abs; } } while (--i != 0); }
/* round up LSB */ { u64 summand = (rem << 1) >= b_abs;
res_abs += summand; }
res = (s64) res_abs; if (a_neg ^ b_neg) res = -res; return res;}
static inline s64 drm_fixp_exp(s64 x){ s64 tolerance = div64_s64(DRM_FIXED_ONE, 1000000); s64 sum = DRM_FIXED_ONE, term, y = x; u64 count = 1;
if (x < 0) y = -1 * x;
term = y;
while (term >= tolerance) { sum = sum + term; count = count + 1; term = drm_fixp_mul(term, div64_s64(y, count)); }
if (x < 0) sum = drm_fixp_div(DRM_FIXED_ONE, sum);
return sum;}
static inline int fxp_q4_from_int(int val_int){ return val_int << 4;}
static inline int fxp_q4_to_int(int val_q4){ return val_q4 >> 4;}
static inline int fxp_q4_to_int_roundup(int val_q4){ return (val_q4 + 0xf) >> 4;}
static inline int fxp_q4_to_frac(int val_q4){ return val_q4 & 0xf;}
#define FXP_Q4_FMT "%d.%04d"#define FXP_Q4_ARGS(val_q4) fxp_q4_to_int(val_q4), (fxp_q4_to_frac(val_q4) * 625)
#endif