1 files changed, 0 insertions, 161 deletions
diff --git a/arch/i386/boot/a20.c b/arch/i386/boot/a20.c
deleted file mode 100644
index 31348d054fca..000000000000
--- a/arch/i386/boot/a20.c
+++ /dev/null
@@ -1,161 +0,0 @@
-/* -*- linux-c -*- ------------------------------------------------------- *
- *
- *   Copyright (C) 1991, 1992 Linus Torvalds
- *   Copyright 2007 rPath, Inc. - All Rights Reserved
- *
- *   This file is part of the Linux kernel, and is made available under
- *   the terms of the GNU General Public License version 2.
- *
- * ----------------------------------------------------------------------- */
-
-/*
- * arch/i386/boot/a20.c
- *
- * Enable A20 gate (return -1 on failure)
- */
-
-#include "boot.h"
-
-#define MAX_8042_LOOPS	100000
-
-static int empty_8042(void)
-{
-	u8 status;
-	int loops = MAX_8042_LOOPS;
-
-	while (loops--) {
-		io_delay();
-
-		status = inb(0x64);
-		if (status & 1) {
-			/* Read and discard input data */
-			io_delay();
-			(void)inb(0x60);
-		} else if (!(status & 2)) {
-			/* Buffers empty, finished! */
-			return 0;
-		}
-	}
-
-	return -1;
-}
-
-/* Returns nonzero if the A20 line is enabled.  The memory address
-   used as a test is the int $0x80 vector, which should be safe. */
-
-#define A20_TEST_ADDR	(4*0x80)
-#define A20_TEST_SHORT  32
-#define A20_TEST_LONG	2097152	/* 2^21 */
-
-static int a20_test(int loops)
-{
-	int ok = 0;
-	int saved, ctr;
-
-	set_fs(0x0000);
-	set_gs(0xffff);
-
-	saved = ctr = rdfs32(A20_TEST_ADDR);
-
-	while (loops--) {
-		wrfs32(++ctr, A20_TEST_ADDR);
-		io_delay();	/* Serialize and make delay constant */
-		ok = rdgs32(A20_TEST_ADDR+0x10) ^ ctr;
-		if (ok)
-			break;
-	}
-
-	wrfs32(saved, A20_TEST_ADDR);
-	return ok;
-}
-
-/* Quick test to see if A20 is already enabled */
-static int a20_test_short(void)
-{
-	return a20_test(A20_TEST_SHORT);
-}
-
-/* Longer test that actually waits for A20 to come on line; this
-   is useful when dealing with the KBC or other slow external circuitry. */
-static int a20_test_long(void)
-{
-	return a20_test(A20_TEST_LONG);
-}
-
-static void enable_a20_bios(void)
-{
-	asm volatile("pushfl; int $0x15; popfl"
-		     : : "a" ((u16)0x2401));
-}
-
-static void enable_a20_kbc(void)
-{
-	empty_8042();
-
-	outb(0xd1, 0x64);	/* Command write */
-	empty_8042();
-
-	outb(0xdf, 0x60);	/* A20 on */
-	empty_8042();
-}
-
-static void enable_a20_fast(void)
-{
-	u8 port_a;
-
-	port_a = inb(0x92);	/* Configuration port A */
-	port_a |=  0x02;	/* Enable A20 */
-	port_a &= ~0x01;	/* Do not reset machine */
-	outb(port_a, 0x92);
-}
-
-/*
- * Actual routine to enable A20; return 0 on ok, -1 on failure
- */
-
-#define A20_ENABLE_LOOPS 255	/* Number of times to try */
-
-int enable_a20(void)
-{
-	int loops = A20_ENABLE_LOOPS;
-
-#if defined(CONFIG_X86_ELAN)
-	/* Elan croaks if we try to touch the KBC */
-	enable_a20_fast();
-	while (!a20_test_long())
-		;
-	return 0;
-#elif defined(CONFIG_X86_VOYAGER)
-	/* On Voyager, a20_test() is unsafe? */
-	enable_a20_kbc();
-	return 0;
-#else
-	while (loops--) {
-		/* First, check to see if A20 is already enabled
-		   (legacy free, etc.) */
-		if (a20_test_short())
-			return 0;
-
-		/* Next, try the BIOS (INT 0x15, AX=0x2401) */
-		enable_a20_bios();
-		if (a20_test_short())
-			return 0;
-
-		/* Try enabling A20 through the keyboard controller */
-		empty_8042();
-		if (a20_test_short())
-			return 0; /* BIOS worked, but with delayed reaction */
-
-		enable_a20_kbc();
-		if (a20_test_long())
-			return 0;
-
-		/* Finally, try enabling the "fast A20 gate" */
-		enable_a20_fast();
-		if (a20_test_long())
-			return 0;
-	}
-
-	return -1;
-#endif
-}