Modify gPXE core and drivers to work with the new timer subsystem

Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>

src/arch/i386/Makefile

@@ -7,6 +7,7 @@ ISOLINUX_BIN	= /usr/lib/syslinux/isolinux.bin
 SRCDIRS		+= arch/i386/core arch/i386/transitions arch/i386/prefix
 SRCDIRS		+= arch/i386/firmware/pcbios
 SRCDIRS		+= arch/i386/image
+SRCDIRS		+= arch/i386/drivers
 SRCDIRS		+= arch/i386/drivers/bus
 SRCDIRS		+= arch/i386/drivers/net
 SRCDIRS		+= arch/i386/drivers/disk

src/arch/i386/firmware/pcbios/gateA20.c

@@ -1,8 +1,7 @@
 #include <stdio.h>
-#include "realmode.h"
-#include "timer.h"
-#include "latch.h"
-#include "bios.h"
+#include <realmode.h>
+#include <bios.h>
+#include <gpxe/timer.h>
 
 #define K_RDWR		0x60		/* keyboard data & cmds (read/write) */
 #define K_STATUS	0x64		/* keyboard status */

src/arch/i386/include/latch.h

@@ -1,12 +0,0 @@
-#ifndef LATCH_H
-#define LATCH_H
-
-#define	TICKS_PER_SEC		18
-
-/* For different calibrators of the TSC move the declaration of
- * sleep_latch and the definitions of it's length here...
- */
-
-extern unsigned long currticks ( void );
-
-#endif /* LATCH_H */