Drop the gateA20() function in the loader as it is unused. All the other

boot loaders that load the loader already handle A20.  In fact, they are
required to do so in order to setup the environment that btxldr expects.

3 files changed, 1 insertions, 57 deletions

diff --git a/sys/boot/i386/libi386/Makefile b/sys/boot/i386/libi386/Makefile
index 01ae3f4..4de6d02 100644
--- a/sys/boot/i386/libi386/Makefile
+++ b/sys/boot/i386/libi386/Makefile
@@ -6,7 +6,7 @@ INTERNALLIB=
 SRCS=	biosacpi.c bioscd.c biosdisk.c biosmem.c biospnp.c \
 	biospci.c biossmap.c bootinfo.c bootinfo32.c bootinfo64.c \
 	comconsole.c devicename.c elf32_freebsd.c \
-	elf64_freebsd.c gatea20.c \
+	elf64_freebsd.c \
 	i386_copy.c i386_module.c nullconsole.c pxe.c pxetramp.s \
 	smbios.c time.c vidconsole.c amd64_tramp.S
 
diff --git a/sys/boot/i386/libi386/gatea20.c b/sys/boot/i386/libi386/gatea20.c
deleted file mode 100644
index 1c5f0f0..0000000
--- a/sys/boot/i386/libi386/gatea20.c
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * $NetBSD: gatea20.c,v 1.2 1997/10/29 00:32:49 fvdl Exp $
- */
-
-/* extracted from freebsd:sys/i386/boot/biosboot/io.c */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <stand.h>
-#include <machine/cpufunc.h>
-
-#include <bootstrap.h>
-
-#include "libi386.h"
-
-#define K_RDWR 		0x60		/* keyboard data & cmds (read/write) */
-#define K_STATUS 	0x64		/* keyboard status */
-#define K_CMD	 	0x64		/* keybd ctlr command (write-only) */
-
-#define K_OBUF_FUL 	0x01		/* output buffer full */
-#define K_IBUF_FUL 	0x02		/* input buffer full */
-
-#define KC_CMD_WIN	0xd0		/* read  output port */
-#define KC_CMD_WOUT	0xd1		/* write output port */
-#define KB_A20		0x9f		/* enable A20,
-					   reset (!),
-					   enable output buffer full interrupt
-					   enable data line
-					   disable clock line */
-
-/*
- * Gate A20 for high memory
- */
-static unsigned char	x_20 = KB_A20;
-void gateA20()
-{
-	__asm("pushfl ; cli");
-#ifdef	IBM_L40
-	outb(0x92, 0x2);
-#else	/* !IBM_L40 */
-	while (inb(K_STATUS) & K_IBUF_FUL);
-	while (inb(K_STATUS) & K_OBUF_FUL)
-		(void)inb(K_RDWR);
-
-	outb(K_CMD, KC_CMD_WOUT);
-	delay(100);
-	while (inb(K_STATUS) & K_IBUF_FUL);
-	outb(K_RDWR, x_20);
-	delay(100);
-	while (inb(K_STATUS) & K_IBUF_FUL);
-#endif	/* IBM_L40 */
-	__asm("popfl");
-}
diff --git a/sys/boot/i386/libi386/libi386.h b/sys/boot/i386/libi386/libi386.h
index ce7e225..699ea74 100644
--- a/sys/boot/i386/libi386/libi386.h
+++ b/sys/boot/i386/libi386/libi386.h
@@ -104,8 +104,6 @@ void	biosacpi_detect(void);
 
 void	smbios_detect(void);
 
-void	gateA20(void);
-
 int	i386_autoload(void);
 
 int	bi_getboothowto(char *kargs);