mb/emulation/qemu-i440fx|q35: Switch to C_ENVIRONMENT_BOOTBLOCK

Useful for testing stuff in C_ENVIRONMENT_BOOTBLOCK, like
VBOOT with separate verstage.

Changes:
* Use symbols to set up CAR and STACK
* Zero CAR area
* Move BIST failure checking to cpu folder
* Rename functions where necessary

Tested:
* qemu-2.11.2 machine pc
* qemu-2.11.2 machine q35

Test result:
* BIST error reporting is still working.
* Console starts in bootblock
* SeaBios 1.11.2 as payload is still working

Change-Id: Ibf341002c36d868b9b44c8b37381fa78ae5c4381
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/29578
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/cpu/qemu-x86/bootblock.c

@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2004 Stefan Reinauer
+ * Copyright (C) 2018 Patrick Rudolph <siro@das-labor.org>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <bootblock_common.h>
+#include <console/console.h>
+#include <cpu/x86/bist.h>
+
+asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist);
+
+asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist)
+{
+	post_code(0x05);
+
+	/* Halt if there was a built in self test failure */
+	if (bist) {
+		console_init();
+		report_bist_failure(bist);
+	}
+
+	/* Call lib/bootblock.c main */
+	bootblock_main_with_timestamp(base_timestamp, NULL, 0);
+}