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is no longer maintained, now struggles to build modern kernels due to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, 175 deletions

diff --git a/arch/metag/tbx/tbidefr.S b/arch/metag/tbx/tbidefr.S
deleted file mode 100644
index 8f0902b..0000000
--- a/arch/metag/tbx/tbidefr.S
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * tbidefr.S
- *
- * Copyright (C) 2009, 2012 Imagination Technologies.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation.
- *
- * Routing deferred exceptions
- */
-
-#include <asm/metag_regs.h>
-#include <asm/tbx.h>
-
-	.text
-	.balign	4
-	.global	___TBIHandleDFR
-	.type	___TBIHandleDFR,function
-/* D1Ar1:D0Ar2 -- State
- * D0Ar3       -- SigNum
- * D0Ar4       -- Triggers
- * D1Ar5       -- Inst
- * D0Ar6       -- pTBI (volatile)
- */
-___TBIHandleDFR:
-#ifdef META_BUG_MBN100212
-	MSETL	[A0StP++], D0FrT, D0.5
-
-	/* D1Ar1,D0Ar2,D1Ar5,D0Ar6 -- Arguments to handler, must be preserved
-	 * D0Ar4       -- The deferred exceptions
-	 * D1Ar3       -- As per D0Ar4 but just the trigger bits
-	 * D0.5        -- The bgnd deferred exceptions
-	 * D1.5        -- TXDEFR with bgnd re-added
-	 */
-
-	/* - Collect the pending deferred exceptions using TXSTAT,
-	 *   (ack's the bgnd exceptions as a side-effect)
-	 * - Manually collect remaining (interrupt) deferred exceptions
-	 *   using TXDEFR
-	 * - Replace the triggers (from TXSTATI) with the int deferred
-	 *   exceptions DEFR ..., TXSTATI would have returned if it was valid
-	 *   from bgnd code
-	 * - Reconstruct TXDEFR by or'ing bgnd deferred exceptions (except
-	 *   the DEFER bit) and the int deferred exceptions. This will be
-	 *   restored later
-	 */
-	DEFR	D0.5,  TXSTAT
-	MOV	D1.5,  TXDEFR
-	ANDT	D0.5,  D0.5, #HI(0xFFFF0000)
-	MOV	D1Ar3, D1.5
-	ANDT	D1Ar3, D1Ar3, #HI(0xFFFF0000)
-	OR	D0Ar4, D1Ar3, #TXSTAT_DEFER_BIT
-	OR	D1.5, D1.5, D0.5
-
-	/* Mask off anything unrelated to the deferred exception triggers */
-	ANDT	D1Ar3, D1Ar3, #HI(TXSTAT_BUSERR_BIT | TXSTAT_FPE_BITS)
-
-	/* Can assume that at least one exception happened since this
-	 * handler wouldnt have been called otherwise.
-	 * 
-	 * Replace the signal number and at the same time, prepare
-	 * the mask to acknowledge the exception
-	 *
-	 * D1Re0 -- The bits to acknowledge
-	 * D1Ar3 -- The signal number
-	 * D1RtP -- Scratch to deal with non-conditional insns
-	 */
-	MOVT	D1Re0, #HI(TXSTAT_FPE_BITS & ~TXSTAT_FPE_DENORMAL_BIT)
-	MOV	D1RtP, #TXSTAT_FPE_INVALID_S
-	FFB	D1Ar3, D1Ar3
-	CMP	D1Ar3, #TXSTAT_FPE_INVALID_S
-	MOVLE	D1Ar3, D1RtP /* Collapse FPE triggers to a single signal */
-	MOV	D1RtP, #1
-	LSLGT	D1Re0, D1RtP, D1Ar3
-
-	/* Get the handler using the signal number
-	 *
-	 * D1Ar3 -- The signal number
-	 * D0Re0 -- Offset into TBI struct containing handler address
-	 * D1Re0 -- Mask of triggers to keep
-	 * D1RtP -- Address of handler
-	 */
-	SUB	D1Ar3, D1Ar3, #(TXSTAT_FPE_INVALID_S - TBID_SIGNUM_FPE)
-	LSL	D0Re0, D1Ar3, #2
-	XOR	D1Re0, D1Re0, #-1   /* Prepare mask for acknowledge (avoids stall) */
-	ADD	D0Re0,D0Re0,#TBI_fnSigs
-	GETD	D1RtP, [D0Ar6+D0Re0]
-
-	/* Acknowledge triggers */
-	AND	D1.5, D1.5, D1Re0
-
-	/* Restore remaining exceptions
-	 * Do this here in case the handler enables nested interrupts
-	 *
-	 * D1.5 -- TXDEFR with this exception ack'd
-	 */
-	MOV	TXDEFR, D1.5
-
-	/* Call the handler */
-	SWAP	D1RtP, PC
-
-	GETL	D0.5,  D1.5,  [--A0StP]
-	GETL	D0FrT, D1RtP, [--A0StP]
-	MOV	PC,D1RtP
-#else  /* META_BUG_MBN100212 */
-
-	/* D1Ar1,D0Ar2,D1Ar5,D0Ar6 -- Arguments to handler, must be preserved
-	 * D0Ar4       -- The deferred exceptions
-	 * D1Ar3       -- As per D0Ar4 but just the trigger bits
-	 */
-
-	/* - Collect the pending deferred exceptions using TXSTAT,
-	 *   (ack's the interrupt exceptions as a side-effect)
-	 */
-	DEFR	D0Ar4, TXSTATI
-
-	/* Mask off anything unrelated to the deferred exception triggers */
-	MOV	D1Ar3, D0Ar4
-	ANDT	D1Ar3, D1Ar3, #HI(TXSTAT_BUSERR_BIT | TXSTAT_FPE_BITS)
-
-	/* Can assume that at least one exception happened since this
-	 * handler wouldnt have been called otherwise.
-	 * 
-	 * Replace the signal number and at the same time, prepare
-	 * the mask to acknowledge the exception
-	 *
-	 * The unusual code for 1<<D1Ar3 may need explanation.
-	 * Normally this would be done using 'MOV rs,#1' and 'LSL rd,rs,D1Ar3'
-	 * but only D1Re0 is available in D1 and no crossunit insns are available
-	 * Even worse, there is no conditional 'MOV r,#uimm8'.
-	 * Since the CMP proves that D1Ar3 >= 20, we can reuse the bottom 12-bits
-	 * of D1Re0 (using 'ORGT r,#1') in the knowledge that the top 20-bits will
-	 * be discarded without affecting the result.
-	 *
-	 * D1Re0 -- The bits to acknowledge
-	 * D1Ar3 -- The signal number
-	 */
-	MOVT	D1Re0, #HI(TXSTAT_FPE_BITS & ~TXSTAT_FPE_DENORMAL_BIT)
-	MOV	D0Re0, #TXSTAT_FPE_INVALID_S
-	FFB	D1Ar3, D1Ar3
-	CMP	D1Ar3, #TXSTAT_FPE_INVALID_S
-	MOVLE	D1Ar3, D0Re0 /* Collapse FPE triggers to a single signal */
-	ORGT	D1Re0, D1Re0, #1
-	LSLGT	D1Re0, D1Re0, D1Ar3
-
-	SUB	D1Ar3, D1Ar3, #(TXSTAT_FPE_INVALID_S - TBID_SIGNUM_FPE)
-
-	/* Acknowledge triggers and restore remaining exceptions
-	 * Do this here in case the handler enables nested interrupts
-	 *
-	 * (x | y) ^ y == x & ~y. It avoids the restrictive XOR ...,#-1 insn
-	 * and is the same length
-	 */
-	MOV	D0Re0, TXDEFR
-	OR	D0Re0, D0Re0, D1Re0
-	XOR	TXDEFR, D0Re0, D1Re0
-
-	/* Get the handler using the signal number
-	 *
-	 * D1Ar3 -- The signal number
-	 * D0Re0 -- Address of handler
-	 */
-	LSL	D0Re0, D1Ar3, #2
-	ADD	D0Re0,D0Re0,#TBI_fnSigs
-	GETD	D0Re0, [D0Ar6+D0Re0]
-
-	/* Tailcall the handler */
-	MOV	PC,D0Re0
-
-#endif /* META_BUG_MBN100212 */
-	.size	___TBIHandleDFR,.-___TBIHandleDFR
-/*
- * End of tbidefr.S
- */