Documented the basic PXE data types

src/include/pxe_types.h

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+#ifndef PXE_TYPES_H
+#define PXE_TYPES_H
+
+/** @addtogroup pxe Preboot eXecution Environment (PXE) API
+ * @{
+ */
+
+/** @file
+ *
+ * PXE data types
+ *
+ */
+
+#include "stdint.h"
+#include "pxe_addr.h" /* Architecture-specific PXE definitions */
+#include "errno.h" /* PXE status codes */
+
+/** @defgroup pxe_types PXE data types
+ *
+ * These definitions are based on Table 1-1 ("Data Type Definitions")
+ * in the Intel PXE specification version 2.1.  They have been
+ * generalised to non-x86 architectures where possible.
+ *
+ * @{
+ */
+
+/** An 8-bit unsigned integer */
+typedef uint8_t UINT8;
+
+/** A 16-bit unsigned integer */
+typedef uint16_t UINT16;
+
+/** A 32-bit unsigned integer */
+typedef uint32_t UINT32;
+
+/** A PXE exit code.
+ *
+ * Permitted values are PXENV_EXIT_SUCCESS and PXENV_EXIT_FAILURE.
+ *
+ */
+typedef uint16_t PXENV_EXIT;
+
+/** A PXE status code.
+ *
+ * Status codes are defined in errno.h.
+ *
+ */
+typedef uint16_t PXENV_STATUS;
+
+/** An IP address.
+ *
+ * This is an IPv4 address in host byte order.
+ *
+ */
+typedef uint32_t IP4;
+
+/** A UDP port.
+ *
+ * Note that this is in network (big-endian) byte order.
+ *
+ */
+typedef uint16_t UDP_PORT;
+
+/** Maximum length of a MAC address */
+#define MAC_ADDR_LEN 16
+
+/** A MAC address */
+typedef uint8_t MAC_ADDR[MAC_ADDR_LEN];
+
+/** A physical address.
+ *
+ * For x86, this is a 32-bit physical address, and is therefore
+ * limited to the low 4GB.
+ *
+ */
+typedef physaddr_t ADDR32;
+
+#ifndef HAVE_ARCH_SEGSEL
+/** A segment selector.
+ *
+ * For x86, this is a real mode segment (0x0000-0xffff), or a
+ * protected-mode segment selector, such as could be loaded into a
+ * segment register.
+ *
+ */
+typedef uint16_t SEGSEL;
+#endif
+
+#ifndef HAVE_ARCH_OFF16
+/** An offset within a segment identified by #SEGSEL */
+typedef uint16_t OFF16;
+#endif
+
+/** A segment:offset address */
+typedef struct s_SEGOFF16 {
+	OFF16	offset;			/**< Offset within the segment */
+	SEGSEL	segment;		/**< Segment selector */
+} SEGOFF16 __attribute__ (( packed ));
+
+/** A segment descriptor */
+typedef struct s_SEGDESC {
+	SEGSEL	segment_address;	/**< Segment selector */
+	ADDR32	physical_address;	/**< Base address of the segment */
+	OFF16	seg_size;		/**< Size of the segment */
+} SEGDESC __attribute__ (( packed ));
+
+/** @} */ /* defgroup */
+
+
+/** @} */ /* addtogroup */
+
+#endif /* PXE_TYPES_H */