[arch][arm64] initial port to armv8-a (aarch64)

arch/arm64/arch.c

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2014 Travis Geiselbrecht
+ *
+ * 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.
+ */
+#include <debug.h>
+#include <arch.h>
+#include <arch/ops.h>
+#include <arch/arm64.h>
+#include <platform.h>
+
+extern int _end_of_ram;
+void *_heap_end = &_end_of_ram;
+
+void arch_early_init(void)
+{
+    /* set the vector base */
+    ARM64_WRITE_SYSREG(VBAR_EL1, (uint64_t)&arm64_exception_base);
+
+    /* switch to EL1 */
+    unsigned int current_el = ARM64_READ_SYSREG(CURRENTEL) >> 2;
+    if (current_el > 1) {
+        arm64_el3_to_el1();
+    }
+}
+
+void arch_init(void)
+{
+}
+
+void arch_quiesce(void)
+{
+}
+
+void arch_idle(void)
+{
+    __asm__ volatile("wfi");
+}
+