Re: [PATCH] [RFC] Emulate "lwsync" to run standard user land on e500 cores
From: Scott Wood <hidden>
Date: 2013-10-23 10:15:32
On Wed, 2013-10-23 at 00:07 -0500, Kumar Gala wrote:
On Oct 18, 2013, at 2:38 AM, Wolfgang Denk wrote:quoted
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index f783c93..f330374 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c@@ -986,6 +986,13 @@ static int emulate_instruction(struct pt_regs *regs)return 0; } + /* Emulating the lwsync insn as a sync insn */ + if (instword == PPC_INST_LWSYNC) { + PPC_WARN_EMULATED(lwsync, regs); + asm volatile("sync" : : : "memory");Do we really need the inline asm? Doesn't the fact of just taking an exception and returning from it equate to a sync.
No, it doesn't equate to a sync. See the discussion here: http://patchwork.ozlabs.org/patch/256747/ -Scott