Andrew Waterman 921ebd8f2c RISC-V: Allow userspace to flush the instruction cache ... 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>		2017-11-30 12:58:29 -08:00
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configs	RISC-V: Build Infrastructure	2017-09-26 15:26:49 -07:00
include	RISC-V: Allow userspace to flush the instruction cache	2017-11-30 12:58:29 -08:00
kernel	RISC-V: Allow userspace to flush the instruction cache	2017-11-30 12:58:29 -08:00
lib	RISC-V: Build Infrastructure	2017-09-26 15:26:49 -07:00
mm	RISC-V: Flush I$ when making a dirty page executable	2017-11-30 12:58:25 -08:00
Kconfig	RISC-V: Build Infrastructure	2017-09-26 15:26:49 -07:00
Makefile	RISC-V: Build Infrastructure	2017-09-26 15:26:49 -07:00