1 files changed, 83 insertions, 0 deletions
diff --git a/arch/arm/machine/cpu_armv6.h b/arch/arm/machine/cpu_armv6.h
new file mode 100644
index 00000000..7520f4b1
--- /dev/null
+++ b/arch/arm/machine/cpu_armv6.h
@@ -0,0 +1,83 @@
+/*
+ * 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/>.
+ */
+
+#ifndef _ARM_CPU_ARMV6_H
+#define _ARM_CPU_ARMV6_H
+
+#if CONFIG_ARM_ARCH >= 6
+
+#ifndef __ASSEMBLER__
+
+#include <stdbool.h>
+#include <stdnoreturn.h>
+
+#include <kern/macros.h>
+
+/*
+ * Enable local interrupts.
+ *
+ * Implies a compiler barrier.
+ */
+static __always_inline void
+cpu_intr_enable(void)
+{
+    asm volatile("cpsie i" : : : "memory", "cc");
+}
+
+/*
+ * Disable local interrupts.
+ *
+ * Implies a compiler barrier.
+ */
+static __always_inline void
+cpu_intr_disable(void)
+{
+    asm volatile("cpsid i" : : : "memory", "cc");
+}
+
+static __always_inline void
+cpu_pause(void)
+{
+    for (;;);
+}
+
+/*
+ * Make the CPU idle until the next interrupt.
+ *
+ * Implies a compiler barrier.
+ */
+static __always_inline void
+cpu_idle(void)
+{
+    asm volatile("wfi" : : : "memory");
+}
+
+noreturn static __always_inline void
+cpu_halt(void)
+{
+    cpu_intr_disable();
+
+    for (;;) {
+        cpu_idle();
+    }
+}
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* ARM_ARCH >= 6 */
+
+#endif /* _ARM_CPU_ARMV6_H */