bsp/x86_64: Minimal bootable BSP

Current state:

  - Basic context initialization and switching code.
  - Stubbed console (empty functions).
  - Mostly functional linker script (may need tweaks if we ever want to move
    away from the large code model (see: CPU_CFLAGS).
  - Fully functional boot, by using FreeBSD's bootloader to load RTEMS's ELF for
    UEFI-awareness.

In short, the current state with this commit lets us boot, go through the system
initialization functions, and then call user application's Init task too.

Updates #2898.

1 files changed, 83 insertions, 0 deletions

diff --git a/cpukit/score/cpu/x86_64/cpu.c b/cpukit/score/cpu/x86_64/cpu.c
new file mode 100644
index 0000000000..308d231186
--- /dev/null
+++ b/cpukit/score/cpu/x86_64/cpu.c
@@ -0,0 +1,83 @@
+/**
+ *  @file
+ *
+ *  @brief x86_64 Dependent Source
+ */
+
+/*
+ * Copyright (c) 2018.
+ * Amaan Cheval <amaan.cheval@gmail.com>
+ *
+ * Copyright (c) 1989-1999.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/wkspace.h>
+#include <rtems/score/tls.h>
+
+Context_Control_fp _CPU_Null_fp_context;
+
+void _CPU_Exception_frame_print(const CPU_Exception_frame *ctx)
+{
+}
+
+void _CPU_Initialize(void)
+{
+}
+
+uint32_t _CPU_ISR_Get_level(void)
+{
+  return 0;
+}
+
+void _CPU_ISR_install_raw_handler(
+  uint32_t    vector,
+  proc_ptr    new_handler,
+  proc_ptr   *old_handler
+)
+{
+}
+
+void _CPU_ISR_install_vector(
+  uint32_t    vector,
+  proc_ptr    new_handler,
+  proc_ptr   *old_handler
+)
+{
+}
+
+void _CPU_Install_interrupt_stack(void)
+{
+}
+
+void *_CPU_Thread_Idle_body(uintptr_t ignored)
+{
+  for( ; ; ) { }
+}