x86: fsp: Add access to variable MRC data

With FSP2 the non-volatile storage used by the FSP to init memory can be
split into a fixed piece (determined at compile time) and a variable piece
(determined at run time). Add support for reading the latter.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/x86/include/asm/fsp/fsp_support.h b/arch/x86/include/asm/fsp/fsp_support.h
index 8dea2e71ea..4ac27d26f5 100644
--- a/arch/x86/include/asm/fsp/fsp_support.h
+++ b/arch/x86/include/asm/fsp/fsp_support.h
@@ -104,6 +104,18 @@ u32 fsp_get_tseg_reserved_mem(const void *hob_list, u32 *len);
 void *fsp_get_nvs_data(const void *hob_list, u32 *len);
 
 /**
+ * fsp_get_var_nvs_data() - get FSP variable Non-volatile Storage HOB buffer
+ *
+ * @hob_list:      A HOB list pointer.
+ * @len:           A pointer to the NVS data buffer length.
+ *                 If the HOB is located, the length will be updated.
+ *
+ * @return NULL:   Failed to find the NVS HOB.
+ * @return others: FSP NVS data buffer pointer.
+ */
+void *fsp_get_var_nvs_data(const void *hob_list, u32 *len);
+
+/**
  * fsp_get_graphics_info() - retrieves graphics information.
  *
  * @hob_list:      A HOB list pointer.