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-rw-r--r--src/include/smmstore.h94
1 files changed, 90 insertions, 4 deletions
diff --git a/src/include/smmstore.h b/src/include/smmstore.h
index ff0b72001a..2c37ca39b9 100644
--- a/src/include/smmstore.h
+++ b/src/include/smmstore.h
@@ -10,10 +10,18 @@
#define SMMSTORE_RET_FAILURE 1
#define SMMSTORE_RET_UNSUPPORTED 2
+/* Version 1 */
#define SMMSTORE_CMD_CLEAR 1
#define SMMSTORE_CMD_READ 2
#define SMMSTORE_CMD_APPEND 3
+/* Version 2 */
+#define SMMSTORE_CMD_INIT 4
+#define SMMSTORE_CMD_RAW_READ 5
+#define SMMSTORE_CMD_RAW_WRITE 6
+#define SMMSTORE_CMD_RAW_CLEAR 7
+
+/* Version 1 */
struct smmstore_params_read {
void *buf;
ssize_t bufsize;
@@ -26,12 +34,90 @@ struct smmstore_params_append {
size_t valsize;
};
-/* SMM responder */
+/* Version 2 */
+/*
+ * The Version 2 protocol separates the SMMSTORE into 64KiB blocks, each
+ * of which can be read/written/cleared in an independent manner. The
+ * data format isn't specified. See documentation page for more details.
+ */
+
+#define SMM_BLOCK_SIZE (64 * KiB)
+
+/*
+ * Sets the communication buffer to use for read and write operations.
+ */
+struct smmstore_params_init {
+ uint32_t com_buffer;
+ uint32_t com_buffer_size;
+} __packed;
+
+/*
+ * Returns the number of blocks the SMMSTORE supports and their size.
+ * For EDK2 this should be at least two blocks with 64 KiB each.
+ * The mmap_addr is set the memory mapped physical address of the SMMSTORE.
+ */
+struct smmstore_params_info {
+ uint32_t num_blocks;
+ uint32_t block_size;
+ uint32_t mmap_addr;
+} __packed;
+
+/*
+ * Reads a chunk of raw data with size @bufsize from the block specified by
+ * @block_id starting at @bufoffset.
+ * The read data is placed in memory pointed to by @buf.
+ *
+ * @block_id must be less than num_blocks
+ * @bufoffset + @bufsize must be less than block_size
+ */
+struct smmstore_params_raw_write {
+ uint32_t bufsize;
+ uint32_t bufoffset;
+ uint32_t block_id;
+} __packed;
+
+/*
+ * Writes a chunk of raw data with size @bufsize to the block specified by
+ * @block_id starting at @bufoffset.
+ *
+ * @block_id must be less than num_blocks
+ * @bufoffset + @bufsize must be less than block_size
+ */
+struct smmstore_params_raw_read {
+ uint32_t bufsize;
+ uint32_t bufoffset;
+ uint32_t block_id;
+} __packed;
+
+/*
+ * Erases the specified block.
+ *
+ * @block_id must be less than num_blocks
+ */
+struct smmstore_params_raw_clear {
+ uint32_t block_id;
+} __packed;
+
+
+/* SMM handler */
uint32_t smmstore_exec(uint8_t command, void *param);
-/* implementation */
+/* Implementation of Version 1 */
int smmstore_read_region(void *buf, ssize_t *bufsize);
-int smmstore_append_data(void *key, uint32_t key_sz,
- void *value, uint32_t value_sz);
+int smmstore_append_data(void *key, uint32_t key_sz, void *value, uint32_t value_sz);
int smmstore_clear_region(void);
+
+/* Implementation of Version 2 */
+int smmstore_init(void *buf, size_t len);
+int smmstore_rawread_region(uint32_t block_id, uint32_t offset, uint32_t bufsize);
+int smmstore_rawwrite_region(uint32_t block_id, uint32_t offset, uint32_t bufsize);
+int smmstore_rawclear_region(uint32_t block_id);
+#if ENV_RAMSTAGE
+int smmstore_get_info(struct smmstore_params_info *info);
+#endif
+
+/* Advertise SMMSTORE v2 support */
+struct lb_header;
+void lb_smmstorev2(struct lb_header *header);
+
#endif