X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Ftimer.h;h=b71e62f6ca2682bd29fbd945f08b91e044a61ae2;hb=bd35c984636a2d5dfdff7a80f8eaa4e388c6899c;hp=7f985d5b8fd2c391ce6d10c578ea09ba6c79472f;hpb=a2f94f569a4c99204de02814a20098a71527e913;p=bootcensus

diff --git a/src/timer.h b/src/timer.h
index 7f985d5..b71e62f 100644
--- a/src/timer.h
+++ b/src/timer.h
@@ -1,7 +1,27 @@
+/*
+pcboot - bootable PC demo/game kernel
+Copyright (C) 2018  John Tsiombikas <nuclear@member.fsf.org>
+
+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 3 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, see <https://www.gnu.org/licenses/>.
+*/
 #ifndef _TIMER_H_
 #define _TIMER_H_
 
-unsigned long nticks;
+#define MSEC_TO_TICKS(ms)	((ms) * TICK_FREQ_HZ / 1000)
+#define TICKS_TO_MSEC(tk)	((tk) * 1000 / TICK_FREQ_HZ)
+
+volatile unsigned long nticks;
 
 void init_timer(void);