common: Implement enable_interrupts() and disable_interrupts().

diff --git a/SConscript.libcommon b/SConscript.libcommon
index 3e229c23dd65585b900a3bba845f8e7a2c176b2c..79433bc78b5236e1117654e2e5ca93194d587cb5 100644 (file)
--- a/SConscript.libcommon
+++ b/SConscript.libcommon
@@ -16,6 +16,7 @@ source_files_rs = [
 
 source_files_c = [
     'src/common/startup.c',
+    'src/common/asm_helpers.c',
     'src/common/systick.c',
     'src/common/ringbuf.c',
     'src/common/flash.c',

diff --git a/src/common/asm_helpers.c b/src/common/asm_helpers.c
new file mode 100644 (file)
index 0000000..b7b5303
--- /dev/null
+++ b/src/common/asm_helpers.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2019 Tilman Sauerbeck (tilman at code-monkey de)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+void
+enable_interrupts (void)
+{
+    asm volatile ("cpsie i");
+}
+
+void
+disable_interrupts (void)
+{
+    asm volatile ("cpsid i");
+}