arch/x86: Refactor CAR_GLOBAL quirk for FSP1.0

These platforms return to romstage from FSP only after
already having torn CAR down. A copy of the entire CAR
region is available and discoverable via HOB.

Previously, CBMEM console detected on-the-fly that CAR
migration had happened and relocated cbmem_console_p
accoringlin with car_sync_var(). However, if the CAR_GLOBAL
pointing to another object inside CAR is a relative offset
instead, we have a more generic solution that can be used
with timestamps code as well.

Change-Id: Ica877b47e68d56189e9d998b5630019d4328a419
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35140
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 13 insertions, 6 deletions

diff --git a/src/arch/x86/include/arch/early_variables.h b/src/arch/x86/include/arch/early_variables.h
index 3910a820da..8111e7e10b 100644
--- a/src/arch/x86/include/arch/early_variables.h
+++ b/src/arch/x86/include/arch/early_variables.h
@@ -33,19 +33,25 @@ asm(".previous");
 /* Get the correct pointer for the CAR global variable. */
 void *car_get_var_ptr(void *var);
 
-/* Get and update a CAR_GLOBAL pointing elsewhere in car.global_data*/
-void *car_sync_var_ptr(void *var);
-
 /* Return 1 when currently running with globals in Cache-as-RAM, 0 otherwise. */
 int car_active(void);
 
 /* Get and set a primitive type global variable. */
 #define car_get_var(var) \
 	(*(typeof(var) *)car_get_var_ptr(&(var)))
-#define car_sync_var(var) \
-	(*(typeof(var) *)car_sync_var_ptr(&(var)))
 #define car_set_var(var, val)	car_get_var(var) = (val)
 
+/* Get and set a CAR_GLOBAL pointing elsewhere inside CAR. */
+#if !CONFIG(PLATFORM_USES_FSP1_0)
+#define car_get_ptr car_get_var
+#define car_set_ptr car_set_var
+#else
+void *car_get_reloc_ptr(void *var);
+void car_set_reloc_ptr(void *var, void *val);
+#define car_get_ptr(var) car_get_reloc_ptr(&(var))
+#define car_set_ptr(var, val) car_set_reloc_ptr(&(var), (val))
+#endif
+
 static inline size_t car_data_size(void)
 {
 	size_t car_size = _car_relocatable_data_size;
@@ -66,8 +72,9 @@ static inline size_t car_object_offset(void *ptr)
 
 #define CAR_GLOBAL
 #define car_get_var(var) (var)
-#define car_sync_var(var) (var)
 #define car_set_var(var, val)	(var) = (val)
+#define car_get_ptr car_get_var
+#define car_set_ptr car_set_var
 
 static inline void *car_get_var_ptr(void *var)
 {