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-rw-r--r--src/cpu/x86/car.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/cpu/x86/car.c b/src/cpu/x86/car.c
index c9cc6d6178..e757f0912c 100644
--- a/src/cpu/x86/car.c
+++ b/src/cpu/x86/car.c
@@ -73,6 +73,38 @@ void *car_get_var_ptr(void *var)
return &migrated_base[offset];
}
+/*
+ * Update a CAR_GLOBAL variable var, originally pointing to CAR region,
+ * with the address in migrated CAR region in DRAM.
+ */
+void *car_sync_var_ptr(void *var)
+{
+ void ** mig_var = car_get_var_ptr(var);
+ void * _car_start = &_car_data_start;
+ void * _car_end = &_car_data_end;
+
+ /* Not moved or migrated yet. */
+ if (mig_var == var)
+ return mig_var;
+
+ /* It's already pointing outside car.global_data. */
+ if (*mig_var < _car_start || *mig_var > _car_end)
+ return mig_var;
+
+#if !IS_ENABLED(CONFIG_PLATFORM_USES_FSP)
+ /* Keep console buffer in CAR until cbmemc_reinit() moves it. */
+ if (*mig_var == _car_end)
+ return mig_var;
+#endif
+
+ /* Move the pointer by the same amount the variable storing it was
+ * moved by.
+ */
+ *mig_var += (char *)mig_var - (char *)var;
+
+ return mig_var;
+}
+
static void do_car_migrate_variables(void)
{
void *migrated_base;