1 files changed, 103 insertions, 0 deletions
diff --git a/kern/atomic_types.h b/kern/atomic_types.h
new file mode 100644
index 0000000..cdf1161
--- /dev/null
+++ b/kern/atomic_types.h
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2018 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_ATOMIC_TYPES_H
+#define KERN_ATOMIC_TYPES_H
+
+/*
+ * After function selection, type genericity is achieved with transparent
+ * unions, a GCC extension. Here are a few things to keep in mind :
+ *  - all members must have the same representation
+ *  - calling conventions are inferred from the first member
+ */
+
+#ifdef __LP64__
+
+union atomic_ptr_32 {
+    int *i_ptr;
+    unsigned int *ui_ptr;
+} __attribute__((transparent_union));
+
+union atomic_constptr_32 {
+    const int *i_ptr;
+    const unsigned int *ui_ptr;
+} __attribute__((transparent_union));
+
+union atomic_val32 {
+    int i;
+    unsigned int ui;
+} __attribute__((transparent_union));
+
+union atomic_ptr_64 {
+    void *ptr;
+    unsigned long long *ull_ptr;
+} __attribute__((transparent_union));
+
+union atomic_constptr_64 {
+    const void *ptr;
+    const unsigned long long *ull_ptr;
+} __attribute__((transparent_union));
+
+union atomic_val_64 {
+    void *ptr;
+    long l;
+    unsigned long ul;
+    long long ll;
+    unsigned long long ull;
+} __attribute__((transparent_union));
+
+#else /* __LP64__ */
+
+union atomic_ptr_32 {
+    void *ptr;
+    unsigned int *ui_ptr;
+} __attribute__((transparent_union));
+
+union atomic_constptr_32 {
+    const void *ptr;
+    const unsigned int *ui_ptr;
+} __attribute__((transparent_union));
+
+union atomic_val32 {
+    void *ptr;
+    int i;
+    unsigned int ui;
+    long l;
+    unsigned long ul;
+} __attribute__((transparent_union));
+
+union atomic_ptr_64 {
+    long long *ll_ptr;
+    unsigned long long *ull_ptr;
+} __attribute__((transparent_union));
+
+union atomic_constptr_64 {
+    const long long *ll_ptr;
+    const unsigned long long *ull_ptr;
+} __attribute__((transparent_union));
+
+union atomic_val_64 {
+    long long ll;
+    unsigned long long ull;
+} __attribute__((transparent_union));
+
+#endif /* __LP64__ */
+
+#endif /* KERN_ATOMIC_TYPES_H */