From patchwork Wed May 16 04:27:15 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Herrenschmidt X-Patchwork-Id: 159497 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 552CDB6FBB for ; Wed, 16 May 2012 14:29:02 +1000 (EST) Received: from localhost ([::1]:51756 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SUVrA-0002xh-4g for incoming@patchwork.ozlabs.org; Wed, 16 May 2012 00:29:00 -0400 Received: from eggs.gnu.org ([208.118.235.92]:59514) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SUVr1-0002np-1H for qemu-devel@nongnu.org; Wed, 16 May 2012 00:28:52 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SUVqz-0002b9-5e for qemu-devel@nongnu.org; Wed, 16 May 2012 00:28:50 -0400 Received: from gate.crashing.org ([63.228.1.57]:34141) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SUVqy-0002ay-Ty for qemu-devel@nongnu.org; Wed, 16 May 2012 00:28:49 -0400 Received: from pasglop.ozlabs.ibm.com (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.13.8) with ESMTP id q4G4SXoQ007463; Tue, 15 May 2012 23:28:37 -0500 From: Benjamin Herrenschmidt To: qemu-devel@nongnu.org Date: Wed, 16 May 2012 14:27:15 +1000 Message-Id: <1337142445-26548-3-git-send-email-benh@kernel.crashing.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1337142445-26548-1-git-send-email-benh@kernel.crashing.org> References: <1337142445-26548-1-git-send-email-benh@kernel.crashing.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 63.228.1.57 Cc: David Gibson Subject: [Qemu-devel] [PATCH 02/12] Implement cpu_physical_memory_set() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: David Gibson This patch adds cpu_physical_memory_set() function. This is equivalent to calling cpu_physical_memory_write() with a buffer filled with a character, ie, a memset of target memory. It uses a small temporary buffer on the stack. Signed-off-by: David Gibson Signed-off-by: Benjamin Herrenschmidt --- cpu-common.h | 1 + exec.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/cpu-common.h b/cpu-common.h index dca5175..be6b9f3 100644 --- a/cpu-common.h +++ b/cpu-common.h @@ -53,6 +53,7 @@ void qemu_ram_set_idstr(ram_addr_t addr, const char *name, DeviceState *dev); void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf, int len, int is_write); +void cpu_physical_memory_set(target_phys_addr_t addr, uint8_t c, int len); static inline void cpu_physical_memory_read(target_phys_addr_t addr, void *buf, int len) { diff --git a/exec.c b/exec.c index 0607c9b..40cf52d 100644 --- a/exec.c +++ b/exec.c @@ -3581,6 +3581,21 @@ void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf, } } +void cpu_physical_memory_set(target_phys_addr_t addr, uint8_t c, int len) +{ +#define FILLBUF_SIZE 512 + uint8_t fillbuf[FILLBUF_SIZE]; + int l; + + memset(fillbuf, c, FILLBUF_SIZE); + while (len > 0) { + l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE; + cpu_physical_memory_rw(addr, fillbuf, l, true); + len -= len; + addr += len; + } +} + /* used for ROM loading : can write in RAM and ROM */ void cpu_physical_memory_write_rom(target_phys_addr_t addr, const uint8_t *buf, int len)