Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / include / ipxe / nvs.h

diff --git a/qemu/roms/ipxe/src/include/ipxe/nvs.h b/qemu/roms/ipxe/src/include/ipxe/nvs.h
new file mode 100644 (file)
index 0000000..4733123
--- /dev/null
+++ b/qemu/roms/ipxe/src/include/ipxe/nvs.h
@@ -0,0 +1,68 @@
+#ifndef _IPXE_NVS_H
+#define _IPXE_NVS_H
+
+/** @file
+ *
+ * Non-volatile storage
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+
+/** A non-volatile storage device */
+struct nvs_device {
+       /** Word length
+        *
+        * This is expressed as the base-2 logarithm of the word
+        * length in bytes.  A value of 0 therefore translates as
+        * 8-bit words, and a value of 1 translates as 16-bit words.
+        */
+       unsigned int word_len_log2;
+       /** Device size (in words) */
+       unsigned int size;
+       /** Data block size (in words)
+        *
+        * This is the block size used by the device.  It must be a
+        * power of two.  Data reads and writes must not cross a block
+        * boundary.
+        *
+        * Many devices allow reads to cross a block boundary, and
+        * restrict only writes.  For the sake of simplicity, we
+        * assume that the same restriction applies to both reads and
+        * writes.
+        */
+       unsigned int block_size;
+       /** Read data from device
+        *
+        * @v nvs               NVS device
+        * @v address           Address from which to read
+        * @v data              Data buffer
+        * @v len               Length of data buffer
+        * @ret rc              Return status code
+        *
+        * Reads may not cross a block boundary.
+        */
+       int ( * read ) ( struct nvs_device *nvs, unsigned int address,
+                        void *data, size_t len );
+       /** Write data to device
+        *
+        * @v nvs               NVS device
+        * @v address           Address to which to write
+        * @v data              Data buffer
+        * @v len               Length of data buffer
+        * @ret rc              Return status code
+        *
+        * Writes may not cross a block boundary.
+        */
+       int ( * write ) ( struct nvs_device *nvs, unsigned int address,
+                         const void *data, size_t len );
+};
+
+extern int nvs_read ( struct nvs_device *nvs, unsigned int address,
+                     void *data, size_t len );
+extern int nvs_write ( struct nvs_device *nvs, unsigned int address,
+                      const void *data, size_t len );
+
+#endif /* _IPXE_NVS_H */