1 files changed, 50 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/acpimmio/biosram.c b/src/soc/amd/common/block/acpimmio/biosram.c
new file mode 100644
index 0000000000..f0a1257fb9
--- /dev/null
+++ b/src/soc/amd/common/block/acpimmio/biosram.c
@@ -0,0 +1,50 @@
+/*
+ * 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 <cbmem.h>
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/biosram.h>
+
+void backup_top_of_low_cacheable(uintptr_t ramtop)
+{
+	biosram_write32(BIOSRAM_CBMEM_TOP, ramtop);
+}
+
+uintptr_t restore_top_of_low_cacheable(void)
+{
+	return biosram_read32(BIOSRAM_CBMEM_TOP);
+}
+
+void save_uma_size(uint32_t size)
+{
+	biosram_write32(BIOSRAM_UMA_SIZE, size);
+}
+
+void save_uma_base(uint64_t base)
+{
+	biosram_write32(BIOSRAM_UMA_BASE, (uint32_t) base);
+	biosram_write32(BIOSRAM_UMA_BASE + 4, (uint32_t) (base >> 32));
+}
+
+uint32_t get_uma_size(void)
+{
+	return biosram_read32(BIOSRAM_UMA_SIZE);
+}
+
+uint64_t get_uma_base(void)
+{
+	uint64_t base;
+	base = biosram_read32(BIOSRAM_UMA_BASE);
+	base |= ((uint64_t)(biosram_read32(BIOSRAM_UMA_BASE + 4)) << 32);
+	return base;
+}