/* 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)