cpu/intel/car: Enable use of C_ENVIRONMENT_BOOTBLOCK

Add common C entry points that hook to platform-specific
bootblock code.

Change-Id: I8eac974864f255811e8708997a8014a45a5c09ee
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30494
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/car/bootblock.c

@@ -0,0 +1,36 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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 <cpu/intel/car/bootblock.h>
+
+asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist)
+{
+	/* Call lib/bootblock.c main */
+	bootblock_main_with_timestamp(base_timestamp, NULL, 0);
+}
+
+void __weak bootblock_early_northbridge_init(void) { }
+void __weak bootblock_early_southbridge_init(void) { }
+void __weak bootblock_early_cpu_init(void) { }
+
+void bootblock_soc_early_init(void)
+{
+	bootblock_early_northbridge_init();
+	bootblock_early_southbridge_init();
+	bootblock_early_cpu_init();
+}
+
+void bootblock_soc_init(void)
+{
+}

src/cpu/intel/car/bootblock.h

@@ -0,0 +1,21 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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.
+ */
+
+#ifndef _CPU_INTEL_CAR_BOOTBLOCK_H
+#define _CPU_INTEL_CAR_BOOTBLOCK_H
+
+void bootblock_early_cpu_init(void);
+void bootblock_early_northbridge_init(void);
+void bootblock_early_southbridge_init(void);
+
+#endif

src/cpu/intel/car/romstage.c

@@ -53,6 +53,7 @@ static void romstage_main(unsigned long bist)
 	platform_enter_postcar();
 }
 
+#if !IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK)
 /* This wrapper enables easy transition towards C_ENVIRONMENT_BOOTBLOCK,
  * keeping changes in cache_as_ram.S easy to manage.
  */
@@ -60,3 +61,18 @@ asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist)
 {
 	romstage_main(bist);
 }
+#endif
+
+
+/* We don't carry BIST from bootblock in a good location to read from.
+ * Any error should have been reported in bootblock already.
+ */
+#define NO_BIST 0
+
+asmlinkage void car_stage_entry(void)
+{
+	/* Assumes the hardware was set up during the bootblock */
+	console_init();
+
+	romstage_main(NO_BIST);
+}