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math: add math library (currently only log_2)

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This commit is contained in:
Aaron Lindsay 2012-10-02 23:08:38 -04:00
parent 9150109729
commit 5a836d0af5
3 changed files with 57 additions and 0 deletions
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28
include/math.h Normal file
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@ -0,0 +1,28 @@
/*
Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
This file is part of Aedrix.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <types.h>
#ifndef MATH_H
#define MATH_H
uint32 log(uint32 i);
#endif /* MATH_H */

1
kernel/kernel.mk
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@ -9,6 +9,7 @@ OBJS_$(d) := $(d)/atags.o \
$(d)/framebuffer.o \ $(d)/framebuffer.o \
$(d)/kmalloc.o \ $(d)/kmalloc.o \
$(d)/list.o \ $(d)/list.o \
$(d)/math.o \
$(d)/mm.o \ $(d)/mm.o \
$(d)/mmu.o \ $(d)/mmu.o \
$(d)/print.o \ $(d)/print.o \

28
kernel/math.c Normal file
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/*
Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
This file is part of Aedrix.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <types.h>
uint32 log(uint32 i) {
unsigned int l = 1;
while ((i = i>>1))
l++;
return l;
}