diff options
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: |
