From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:42934) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QObkq-0005dg-Kw for qemu-devel@nongnu.org; Mon, 23 May 2011 16:29:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QObkp-0008PT-Ok for qemu-devel@nongnu.org; Mon, 23 May 2011 16:29:32 -0400 Received: from mail-gy0-f173.google.com ([209.85.160.173]:59083) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QObkp-0008HM-M8 for qemu-devel@nongnu.org; Mon, 23 May 2011 16:29:31 -0400 Received: by mail-gy0-f173.google.com with SMTP id 4so2710878gyg.4 for ; Mon, 23 May 2011 13:29:31 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Mon, 23 May 2011 13:28:45 -0700 Message-Id: <1306182526-12081-26-git-send-email-rth@twiddle.net> In-Reply-To: <1306182526-12081-1-git-send-email-rth@twiddle.net> References: <1306182526-12081-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH 25/26] target-alpha: Use a fixed frequency for the RPCC in system mode. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Also include the PCC_OFS in the return value. For user mode we can pretend the PCC_OFS value is always zero. Signed-off-by: Richard Henderson --- target-alpha/op_helper.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-) diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c index 91ef90a..36b8289 100644 --- a/target-alpha/op_helper.c +++ b/target-alpha/op_helper.c @@ -65,8 +65,17 @@ static void QEMU_NORETURN arith_excp(int exc, uint64_t mask) uint64_t helper_load_pcc (void) { - /* ??? This isn't a timer for which we have any rate info. */ +#ifndef CONFIG_USER_ONLY + /* In system mode we have access to a decent high-resolution clock. + In order to make OS-level time accounting work with the RPCC, + present it with a well-timed clock fixed at 250MHz. */ + return (((uint64_t)env->pcc_ofs << 32) + | (uint32_t)(qemu_get_clock_ns(vm_clock) >> 2)); +#else + /* In user-mode, vm_clock doesn't exist. Just pass through the host cpu + clock ticks. Also, don't bother taking PCC_OFS into account. */ return (uint32_t)cpu_get_real_ticks(); +#endif } uint64_t helper_load_fpcr (void) -- 1.7.4.4