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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2017-2018 SiFive
*/
/*
* There is explicitly no include guard here because this file is expected to
* be included multiple times in order to define the syscall macros via
* __SYSCALL.
*/
/*
* Allows the instruction cache to be flushed from userspace. 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.
*
* __NR_riscv_flush_icache is defined to flush the instruction cache over an
* address range, with the flush applying to either all threads or just the
* caller. We don't currently do anything with the address range, that's just
* in there for forwards compatibility.
*/
#ifndef __NR_riscv_flush_icache
#define __NR_riscv_flush_icache (__NR_arch_specific_syscall + 15)
#endif
__SYSCALL(__NR_riscv_flush_icache, sys_riscv_flush_icache)
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