X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fasmops.h;h=1f427679f6a662aac4a914bb8352b776d3340f95;hb=6e968b9e724d9626ed6bdf2119ac7de6a5248f14;hp=3ce2f176c5249b54652b69e54c5472e65091d49c;hpb=a2f94f569a4c99204de02814a20098a71527e913;p=bootcensus

diff --git a/src/asmops.h b/src/asmops.h
index 3ce2f17..1f42767 100644
--- a/src/asmops.h
+++ b/src/asmops.h
@@ -1,3 +1,20 @@
+/*
+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 ASMOPS_H_
 #define ASMOPS_H_
 
@@ -57,6 +74,7 @@ static inline uint32_t inl(uint16_t port)
 		"outl %0, %1\n\t" \
 		:: "a" ((uint32_t)(src)), "dN" ((uint16_t)(port)))
 
+/* delay for about 1us */
 #define iodelay() outb(0, 0x80)