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author | James Hogan <jhogan@kernel.org> | 2017-10-24 13:07:54 +0100 |
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committer | James Hogan <jhogan@kernel.org> | 2018-02-22 11:07:21 +0000 |
commit | bb6fb6dfcc17cddac11ac295861f7608194447a7 (patch) | |
tree | 47ee071a415546dd01adbf628f61acb80473d476 /arch/metag/kernel/user_gateway.S | |
parent | 91ab883eb21325ad80f3473633f794c78ac87f51 (diff) | |
download | op-kernel-dev-bb6fb6dfcc17cddac11ac295861f7608194447a7.zip op-kernel-dev-bb6fb6dfcc17cddac11ac295861f7608194447a7.tar.gz |
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is no longer maintained, now struggles to build modern kernels due to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
Diffstat (limited to 'arch/metag/kernel/user_gateway.S')
-rw-r--r-- | arch/metag/kernel/user_gateway.S | 98 |
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: |