[efi] Add "reboot" command for EFI

Abstract out the ability to reboot the system to a separate reboot()
function (with platform-specific implementations), add an EFI
implementation, and make the existing "reboot" command available under
EFI.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/include/bits/reboot.h

@@ -0,0 +1,14 @@
+#ifndef _BITS_REBOOT_H
+#define _BITS_REBOOT_H
+
+/** @file
+ *
+ * i386-specific reboot API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/bios_reboot.h>
+
+#endif /* _BITS_REBOOT_H */

src/arch/i386/include/ipxe/bios_reboot.h

@@ -0,0 +1,18 @@
+#ifndef _IPXE_BIOS_REBOOT_H
+#define _IPXE_BIOS_REBOOT_H
+
+/** @file
+ *
+ * Standard PC-BIOS reboot mechanism
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#ifdef REBOOT_PCBIOS
+#define REBOOT_PREFIX_pcbios
+#else
+#define REBOOT_PREFIX_pcbios __pcbios_
+#endif
+
+#endif /* _IPXE_BIOS_REBOOT_H */

src/arch/i386/interface/pcbios/bios_reboot.c

@@ -17,51 +17,25 @@
  * 02110-1301, USA.
  */
 
-#include <realmode.h>
-#include <ipxe/command.h>
-#include <ipxe/parseopt.h>
-
 FILE_LICENCE ( GPL2_OR_LATER );
 
 /** @file
  *
- * Reboot command
+ * Standard PC-BIOS reboot mechanism
  *
  */
 
-/** "reboot" options */
-struct reboot_options {};
-
-/** "reboot" option list */
-static struct option_descriptor reboot_opts[] = {};
-
-/** "reboot" command descriptor */
-static struct command_descriptor reboot_cmd =
-	COMMAND_DESC ( struct reboot_options, reboot_opts, 0, 0, "" );
+#include <ipxe/reboot.h>
+#include <realmode.h>
 
 /**
- * The "reboot" command
+ * Reboot system
  *
- * @v argc		Argument count
- * @v argv		Argument list
- * @ret rc		Return status code
  */
-static int reboot_exec ( int argc, char **argv ) {
-	struct reboot_options opts;
-	int rc;
+static void bios_reboot ( void ) {
 
-	/* Parse options */
-	if ( ( rc = parse_options ( argc, argv, &reboot_cmd, &opts ) ) != 0 )
-		return rc;
-
-	/* Reboot system */
+	/* Jump to system reset vector */
 	__asm__ __volatile__ ( REAL_CODE ( "ljmp $0xf000, $0xfff0" ) : : );
-
-	return 0;
 }
 
-/** "reboot" command */
-struct command reboot_command __command = {
-	.name = "reboot",
-	.exec = reboot_exec,
-};
+PROVIDE_REBOOT ( pcbios, reboot, bios_reboot );

src/arch/x86_64/include/bits/reboot.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_REBOOT_H
+#define _BITS_REBOOT_H
+
+/** @file
+ *
+ * x86_64-specific reboot API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#endif /* _BITS_REBOOT_H */