kern/syscnt: replace the evcnt module

The syscnt module supports more generic counters, in addition to atomic
access from any context on any architecture.

1 files changed, 43 insertions, 0 deletions

diff --git a/kern/syscnt_types.h b/kern/syscnt_types.h
new file mode 100644
index 00000000..5b429b76
--- /dev/null
+++ b/kern/syscnt_types.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2017 Richard Braun.
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Isolated type definition used to avoid inclusion circular dependencies.
+ */
+
+#ifndef _KERN_SYSCNT_TYPES_H
+#define _KERN_SYSCNT_TYPES_H
+
+#include <stdint.h>
+
+#include <kern/list_types.h>
+#include <kern/spinlock_types.h>
+
+/*
+ * Use atomic access on 64-bits systems, spinlock based critical sections
+ * on 32-bits ones.
+ */
+struct syscnt {
+#ifndef __LP64__
+    struct spinlock lock;
+#endif /* __LP64__ */
+
+    uint64_t value;
+    struct list node;
+    char name[SYSCNT_NAME_SIZE];
+};
+
+#endif /* _KERN_SYSCNT_TYPES_H */