first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

qa/kern/segattach.c

@@ -0,0 +1,71 @@
+/*
+ * This file is part of Jehanne.
+ *
+ * Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
+ *
+ * Jehanne 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, version 2 of the License.
+ *
+ * Jehanne 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 Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <u.h>
+#include <libc.h>
+
+int verbose = 1;
+
+void
+main(void)
+{
+	void *seg;
+	char *p;
+
+	seg = segattach(15, "memory", (void*)0x80000000, 1024*1024);
+	if(seg == (void*)-1){
+		print("FAIL: segattach: %r\n");
+		exits("FAIL");
+	}
+	if(seg != (void*)0x80000000){
+		print("FAIL: segattach: wrong segment base for memory class %#p\n", seg);
+		exits("FAIL");
+	}
+	for(p = seg; p < (char*)seg+(1024*1024); p += 512)
+		*p = 1;
+
+	for(p = seg; p < (char*)seg+(1024*1024); p += 512){
+		if(*p != 1){
+			print("FAIL: segattach: unable to write bytes in attached segment\n");
+			exits("FAIL");
+		}
+	}
+
+	p = seg + 4096*5+10;
+	if(segfree(p, 4096*10) < 0){
+		print("FAIL: segfree: %r\n");
+		exits("FAIL");
+	}
+	for(p = seg; p < (char*)seg+(1024*1024); p += 512){
+		if(*p != 1){
+//			print("segfree: found clean address at %#p\n", p);
+			break;
+		}
+	}
+	if(p == (char*)seg+(1024*1024)){
+		print("FAIL: segfree: no page previously freed had been faulted\n");
+		exit("FAIL");
+	}
+
+	if(segdetach(seg) < 0){
+		print("FAIL: segdetach: %r\n");
+		exits("FAIL");
+	}
+
+	print("PASS\n");
+	exits("PASS");
+}