1 files changed, 229 insertions, 0 deletions
diff --git a/debian/grub-extras/disabled/gpxe/src/include/gpxe/iobuf.h b/debian/grub-extras/disabled/gpxe/src/include/gpxe/iobuf.h
new file mode 100644
index 0000000..8f05f9e
--- /dev/null
+++ b/debian/grub-extras/disabled/gpxe/src/include/gpxe/iobuf.h
@@ -0,0 +1,229 @@
+#ifndef _GPXE_IOBUF_H
+#define _GPXE_IOBUF_H
+
+/** @file
+ *
+ * I/O buffers
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <assert.h>
+#include <gpxe/list.h>
+
+/**
+ * I/O buffer alignment
+ *
+ * I/O buffers allocated via alloc_iob() are guaranteed to be
+ * physically aligned to this boundary.  Some cards cannot DMA across
+ * a 4kB boundary.  With a standard Ethernet MTU, aligning to a 2kB
+ * boundary is sufficient to guarantee no 4kB boundary crossings.  For
+ * a jumbo Ethernet MTU, a packet may be larger than 4kB anyway.
+ */
+#define IOB_ALIGN 2048
+
+/**
+ * Minimum I/O buffer length
+ *
+ * alloc_iob() will round up the allocated length to this size if
+ * necessary.  This is used on behalf of hardware that is not capable
+ * of auto-padding.
+ */
+#define IOB_ZLEN 64
+
+/**
+ * A persistent I/O buffer
+ *
+ * This data structure encapsulates a long-lived I/O buffer.  The
+ * buffer may be passed between multiple owners, queued for possible
+ * retransmission, etc.
+ */
+struct io_buffer {
+	/** List of which this buffer is a member
+	 *
+	 * The list must belong to the current owner of the buffer.
+	 * Different owners may maintain different lists (e.g. a
+	 * retransmission list for TCP).
+	 */
+	struct list_head list;
+
+	/** Start of the buffer */
+	void *head;
+	/** Start of data */
+	void *data;
+	/** End of data */
+	void *tail;
+	/** End of the buffer */
+        void *end;
+};
+
+/**
+ * Reserve space at start of I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @v len	Length to reserve
+ * @ret data	Pointer to new start of buffer
+ */
+static inline void * iob_reserve ( struct io_buffer *iobuf, size_t len ) {
+	iobuf->data += len;
+	iobuf->tail += len;
+	return iobuf->data;
+}
+#define iob_reserve( iobuf, len ) ( {			\
+	void *__result;					\
+	__result = iob_reserve ( (iobuf), (len) );	\
+	assert ( (iobuf)->tail <= (iobuf)->end );	\
+	__result; } )
+
+/**
+ * Add data to start of I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @v len	Length to add
+ * @ret data	Pointer to new start of buffer
+ */
+static inline void * iob_push ( struct io_buffer *iobuf, size_t len ) {
+	iobuf->data -= len;
+	return iobuf->data;
+}
+#define iob_push( iobuf, len ) ( {			\
+	void *__result;					\
+	__result = iob_push ( (iobuf), (len) );		\
+	assert ( (iobuf)->data >= (iobuf)->head );	\
+	__result; } )
+
+/**
+ * Remove data from start of I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @v len	Length to remove
+ * @ret data	Pointer to new start of buffer
+ */
+static inline void * iob_pull ( struct io_buffer *iobuf, size_t len ) {
+	iobuf->data += len;
+	assert ( iobuf->data <= iobuf->tail );
+	return iobuf->data;
+}
+#define iob_pull( iobuf, len ) ( {			\
+	void *__result;					\
+	__result = iob_pull ( (iobuf), (len) );		\
+	assert ( (iobuf)->data <= (iobuf)->tail );	\
+	__result; } )
+
+/**
+ * Add data to end of I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @v len	Length to add
+ * @ret data	Pointer to newly added space
+ */
+static inline void * iob_put ( struct io_buffer *iobuf, size_t len ) {
+	void *old_tail = iobuf->tail;
+	iobuf->tail += len;
+	return old_tail;
+}
+#define iob_put( iobuf, len ) ( {			\
+	void *__result;					\
+	__result = iob_put ( (iobuf), (len) );		\
+	assert ( (iobuf)->tail <= (iobuf)->end );	\
+	__result; } )
+
+/**
+ * Remove data from end of I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @v len	Length to remove
+ */
+static inline void iob_unput ( struct io_buffer *iobuf, size_t len ) {
+	iobuf->tail -= len;
+}
+#define iob_unput( iobuf, len ) do {			\
+	iob_unput ( (iobuf), (len) );			\
+	assert ( (iobuf)->tail >= (iobuf)->data );	\
+	} while ( 0 )
+
+/**
+ * Empty an I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ */
+static inline void iob_empty ( struct io_buffer *iobuf ) {
+	iobuf->tail = iobuf->data;
+}
+
+/**
+ * Calculate length of data in an I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @ret len	Length of data in buffer
+ */
+static inline size_t iob_len ( struct io_buffer *iobuf ) {
+	return ( iobuf->tail - iobuf->data );
+}
+
+/**
+ * Calculate available space at start of an I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @ret len	Length of data available at start of buffer
+ */
+static inline size_t iob_headroom ( struct io_buffer *iobuf ) {
+	return ( iobuf->data - iobuf->head );
+}
+
+/**
+ * Calculate available space at end of an I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @ret len	Length of data available at end of buffer
+ */
+static inline size_t iob_tailroom ( struct io_buffer *iobuf ) {
+	return ( iobuf->end - iobuf->tail );
+}
+
+/**
+ * Create a temporary I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ * @v data	Data buffer
+ * @v len	Length of data
+ * @v max_len	Length of buffer
+ *
+ * It is sometimes useful to use the iob_xxx() methods on temporary
+ * data buffers.
+ */
+static inline void iob_populate ( struct io_buffer *iobuf,
+				  void *data, size_t len, size_t max_len ) {
+	iobuf->head = iobuf->data = data;
+	iobuf->tail = ( data + len );
+	iobuf->end = ( data + max_len );
+}
+
+/**
+ * Disown an I/O buffer
+ *
+ * @v iobuf	I/O buffer
+ *
+ * There are many functions that take ownership of the I/O buffer they
+ * are passed as a parameter.  The caller should not retain a pointer
+ * to the I/O buffer.  Use iob_disown() to automatically nullify the
+ * caller's pointer, e.g.:
+ *
+ *     xfer_deliver_iob ( xfer, iob_disown ( iobuf ) );
+ *
+ * This will ensure that iobuf is set to NULL for any code after the
+ * call to xfer_deliver_iob().
+ */
+#define iob_disown( iobuf ) ( {				\
+	struct io_buffer *__iobuf = (iobuf);		\
+	(iobuf) = NULL;					\
+	__iobuf; } )
+
+extern struct io_buffer * __malloc alloc_iob ( size_t len );
+extern void free_iob ( struct io_buffer *iobuf );
+extern void iob_pad ( struct io_buffer *iobuf, size_t min_len );
+extern int iob_ensure_headroom ( struct io_buffer *iobuf, size_t len );
+
+#endif /* _GPXE_IOBUF_H */