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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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921ebd8f2c
Despite RISC-V having a direct 'fence.i' instruction available to userspace (which we can't trap!), that's not actually viable when running on Linux because the kernel might schedule a process on another hart. There is no way for userspace to handle this without invoking the kernel (as it doesn't know the thread->hart mappings), so we've defined a RISC-V specific system call to flush the instruction cache. This patch adds both a system call and a VDSO entry. If possible, we'd like to avoid having the system call be considered part of the user-facing ABI and instead restrict that to the VDSO entry -- both just in general to avoid having additional user-visible ABI to maintain, and because we'd prefer that users just call the VDSO entry because there might be a better way to do this in the future (ie, one that doesn't require entering the kernel). Signed-off-by: Andrew Waterman <andrew@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
28 lines
892 B
C
28 lines
892 B
C
/*
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* Copyright (C) 2009 Arnd Bergmann <arnd@arndb.de>
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* Copyright (C) 2012 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/linkage.h>
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#include <linux/syscalls.h>
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#include <asm-generic/syscalls.h>
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#include <asm/vdso.h>
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#undef __SYSCALL
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#define __SYSCALL(nr, call) [nr] = (call),
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void *sys_call_table[__NR_syscalls] = {
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[0 ... __NR_syscalls - 1] = sys_ni_syscall,
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#include <asm/unistd.h>
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#include <asm/vdso-syscalls.h>
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};
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