metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 98 deletions

diff --git a/arch/metag/kernel/user_gateway.S b/arch/metag/kernel/user_gateway.S
deleted file mode 100644
index 7833fb8..0000000
--- a/arch/metag/kernel/user_gateway.S
+++ /dev/null
@@ -1,98 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2010 Imagination Technologies Ltd.
- *
- * This file contains code that can be accessed from userspace and can
- * access certain kernel data structures without the overhead of a system
- * call.
- */
-
-#include <asm/metag_regs.h>
-#include <asm/user_gateway.h>
-
-/*
- * User helpers.
- *
- * These are segment of kernel provided user code reachable from user space
- * at a fixed address in kernel memory.  This is used to provide user space
- * with some operations which require kernel help because of unimplemented
- * native feature and/or instructions in some Meta CPUs. The idea is for
- * this code to be executed directly in user mode for best efficiency but
- * which is too intimate with the kernel counter part to be left to user
- * libraries.  The kernel reserves the right to change this code as needed
- * without warning. Only the entry points and their results are guaranteed
- * to be stable.
- *
- * Each segment is 64-byte aligned.  This mechanism should be used only for
- * for things that are really small and justified, and not be abused freely.
- */
-	.text
-	.global	___user_gateway_start
-___user_gateway_start:
-
-	/* get_tls
-	 * Offset:	 0
-	 * Description:	 Get the TLS pointer for this process.
-	 */
-	.global	___kuser_get_tls
-	.type	___kuser_get_tls,function
-___kuser_get_tls:
-	MOVT	D1Ar1,#HI(USER_GATEWAY_PAGE + USER_GATEWAY_TLS)
-	ADD	D1Ar1,D1Ar1,#LO(USER_GATEWAY_PAGE + USER_GATEWAY_TLS)
-	MOV	D1Ar3,TXENABLE
-	AND	D1Ar3,D1Ar3,#(TXENABLE_THREAD_BITS)
-	LSR	D1Ar3,D1Ar3,#(TXENABLE_THREAD_S - 2)
-	GETD	D0Re0,[D1Ar1+D1Ar3]
-___kuser_get_tls_end:		/* Beyond this point the read will complete */
-	MOV	PC,D1RtP
-	.size	___kuser_get_tls,.-___kuser_get_tls
-	.global	___kuser_get_tls_end
-
-	/* cmpxchg
-	 * Offset:	 64
-	 * Description:  Replace the value at 'ptr' with 'newval' if the current
-	 *		 value is 'oldval'. Return zero if we succeeded,
-	 *		 non-zero otherwise.
-	 *
-	 * Reference prototype:
-	 *
-	 *	int __kuser_cmpxchg(int oldval, int newval, unsigned long *ptr)
-	 *
-	 */
-	.balign 64
-	.global ___kuser_cmpxchg
-	.type   ___kuser_cmpxchg,function
-___kuser_cmpxchg:
-#ifdef CONFIG_SMP
-	/*
-	 * We must use LNKGET/LNKSET with an SMP kernel because the other method
-	 * does not provide atomicity across multiple CPUs.
-	 */
-0:	LNKGETD	D0Re0,[D1Ar3]
-	CMP	D0Re0,D1Ar1
-	LNKSETDZ [D1Ar3],D0Ar2
-	BNZ	1f
-	DEFR	D0Re0,TXSTAT
-	ANDT	D0Re0,D0Re0,#HI(0x3f000000)
-	CMPT	D0Re0,#HI(0x02000000)
-	BNE	0b
-#ifdef CONFIG_METAG_LNKGET_AROUND_CACHE
-	DCACHE  [D1Ar3], D0Re0
-#endif
-1:	MOV	D0Re0,#1
-	XORZ	D0Re0,D0Re0,D0Re0
-	MOV	PC,D1RtP
-#else
-	GETD	D0Re0,[D1Ar3]
-	CMP	D0Re0,D1Ar1
-	SETDZ	[D1Ar3],D0Ar2
-___kuser_cmpxchg_end:		/* Beyond this point the write will complete */
-	MOV	D0Re0,#1
-	XORZ	D0Re0,D0Re0,D0Re0
-	MOV	PC,D1RtP
-#endif /* CONFIG_SMP */
-	.size	___kuser_cmpxchg,.-___kuser_cmpxchg
-	.global	___kuser_cmpxchg_end
-
-	.global	___user_gateway_end
-___user_gateway_end: