CBMEM: Tidy up CAR migration

Move the  CAR migration call to arch -specific part of CBMEM init,
it is truly a x86 specific thing.

Change-Id: I715417e54f197b8745e0670d6b900a5660178141
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7860
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: build bot (Jenkins)

src/arch/arm/include/arch/early_variables.h

@@ -27,6 +27,5 @@ static inline void *car_get_var_ptr(void *var) { return var; }
 #define car_get_var(var) (var)
 #define car_sync_var(var) (var)
 #define car_set_var(var, val) do { (var) = (val); } while (0)
-static inline void car_migrate_variables(void) { }
 
 #endif

src/arch/arm64/include/arch/early_variables.h

@@ -27,6 +27,5 @@ static inline void *car_get_var_ptr(void *var) { return var; }
 #define car_get_var(var) (var)
 #define car_sync_var(var) (var)
 #define car_set_var(var, val) do { (var) = (val); } while (0)
-static inline void car_migrate_variables(void) { }
 
 #endif

src/arch/riscv/include/arch/early_variables.h

@@ -20,10 +20,6 @@
 #ifndef ARCH_EARLY_VARIABLES_H
 #define ARCH_EARLY_VARIABLES_H
 
-#if defined(CONFIG_CAR_MIGRATION) && CONFIG_CAR_MIGRATION
-	#error "This is RISCV, silly... we don't have CAR here."
-#endif
-
 #define CAR_GLOBAL
 
 #define CAR_MIGRATE(migrate_fn_)
@@ -31,6 +27,5 @@ static inline void *car_get_var_ptr(void *var) { return var; }
 #define car_get_var(var) (var)
 #define car_sync_var(var) (var)
 #define car_set_var(var, val) do { (var) = (val); } while (0)
-static inline void car_migrate_variables(void) { }
 
 #endif

src/arch/x86/Kconfig

@@ -51,6 +51,21 @@ config ROMCC
 	bool
 	default n
 
+config BROKEN_CAR_MIGRATE
+	def_bool n
+	help
+	  Many boards use CAR_GLOBAL but have no EARLY_CBMEM_INIT and
+	  manage CAR migration on S3 resume path only. Couple boards use
+	  CAR_GLOBAL and never do CAR migration.
+
+config LATE_CBMEM_INIT
+	def_bool n
+	select BROKEN_CAR_MIGRATE
+	help
+	  Enable this in chipset's Kconfig if northbridge does not implement
+	  early get_top_of_ram() call for romstage. CBMEM tables will be
+	  allocated late in ramstage, after PCI devices resources are known.
+
 config PC80_SYSTEM
 	bool
 	default y if ARCH_X86

src/arch/x86/boot/cbmem.c

@@ -21,6 +21,7 @@
 #include <arch/acpi.h>
 
 /* FIXME: Remove after CBMEM_INIT_HOOKS. */
+#include <arch/early_variables.h>
 #include <cpu/x86/gdt.h>
 #include <console/cbmem_console.h>
 #include <timestamp.h>
@@ -76,6 +77,9 @@ void *cbmem_top(void)
 
 void cbmem_run_init_hooks(void)
 {
+	/* Migrate car.global_data. */
+	car_migrate_variables();
+
 #if !defined(__PRE_RAM__)
 	/* Relocate CBMEM console. */
 	cbmemc_reinit();