Add qemu 2.4.0

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

diff --git a/qemu/roms/ipxe/src/include/ipxe/bitbash.h b/qemu/roms/ipxe/src/include/ipxe/bitbash.h
new file mode 100644 (file)
index 0000000..69d5d9e
--- /dev/null
+++ b/qemu/roms/ipxe/src/include/ipxe/bitbash.h
@@ -0,0 +1,84 @@
+#ifndef _IPXE_BITBASH_H
+#define _IPXE_BITBASH_H
+
+/** @file
+ *
+ * Bit-bashing interfaces
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+struct bit_basher;
+
+/** Bit-bashing operations */
+struct bit_basher_operations {
+       /**
+        * Open bit-bashing interface (optional)
+        *
+        * @v basher            Bit-bashing interface
+        */
+       void ( * open ) ( struct bit_basher *basher );
+       /**
+        * Close bit-bashing interface (optional)
+        *
+        * @v basher            Bit-bashing interface
+        */
+       void ( * close ) ( struct bit_basher *basher );
+       /**
+        * Set/clear output bit
+        *
+        * @v basher            Bit-bashing interface
+        * @v bit_id            Bit number
+        * @v data              Value to write
+        * 
+        * @c data will be 0 if a logic 0 should be written (i.e. the
+        * bit should be cleared), or -1UL if a logic 1 should be
+        * written (i.e. the bit should be set).  This is done so that
+        * the method may simply binary-AND @c data with the
+        * appropriate bit mask.
+        */
+       void ( * write ) ( struct bit_basher *basher, unsigned int bit_id,
+                          unsigned long data );
+       /**
+        * Read input bit
+        *
+        * @v basher            Bit-bashing interface
+        * @v bit_id            Bit number
+        * @ret zero            Input is a logic 0
+        * @ret non-zero        Input is a logic 1
+        */
+       int ( * read ) ( struct bit_basher *basher, unsigned int bit_id );
+};
+
+/** A bit-bashing interface */
+struct bit_basher {
+       /** Bit-bashing operations */
+       struct bit_basher_operations *op;
+};
+
+/**
+ * Open bit-bashing interface
+ *
+ * @v basher           Bit-bashing interface
+ */
+static inline void open_bit ( struct bit_basher *basher ) {
+       if ( basher->op->open )
+               basher->op->open ( basher );
+}
+
+/**
+ * Close bit-bashing interface
+ *
+ * @v basher           Bit-bashing interface
+ */
+static inline void close_bit ( struct bit_basher *basher ) {
+       if ( basher->op->close )
+               basher->op->close ( basher );
+}
+
+extern void write_bit ( struct bit_basher *basher, unsigned int bit_id,
+                       unsigned long data );
+extern int read_bit ( struct bit_basher *basher, unsigned int bit_id );
+
+#endif /* _IPXE_BITBASH_H */