From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52891) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1evR8l-00080I-Gb for qemu-devel@nongnu.org; Mon, 12 Mar 2018 13:21:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1evR8i-0007RB-BJ for qemu-devel@nongnu.org; Mon, 12 Mar 2018 13:21:39 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:56678 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1evR8i-0007Qb-6e for qemu-devel@nongnu.org; Mon, 12 Mar 2018 13:21:36 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id AF51F401C9AE for ; Mon, 12 Mar 2018 17:21:33 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" Date: Mon, 12 Mar 2018 17:20:57 +0000 Message-Id: <20180312172124.56461-3-dgilbert@redhat.com> In-Reply-To: <20180312172124.56461-1-dgilbert@redhat.com> References: <20180312172124.56461-1-dgilbert@redhat.com> Subject: [Qemu-devel] [PATCH v5 02/29] qemu_ram_block_host_offset List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, mst@redhat.com, maxime.coquelin@redhat.com, marcandre.lureau@redhat.com, peterx@redhat.com, quintela@redhat.com Cc: aarcange@redhat.com From: "Dr. David Alan Gilbert" Utility to give the offset of a host pointer within a RAMBlock (assuming we already know it's in that RAMBlock) Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Peter Xu --- exec.c | 10 ++++++++++ include/exec/cpu-common.h | 1 + 2 files changed, 11 insertions(+) diff --git a/exec.c b/exec.c index 34fdfd966e..2199b093bd 100644 --- a/exec.c +++ b/exec.c @@ -2297,6 +2297,16 @@ static void *qemu_ram_ptr_length(RAMBlock *ram_block, ram_addr_t addr, return ramblock_ptr(block, addr); } +/* Return the offset of a hostpointer within a ramblock */ +ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host) +{ + ram_addr_t res = (uint8_t *)host - (uint8_t *)rb->host; + assert((uintptr_t)host >= (uintptr_t)rb->host); + assert(res < rb->max_length); + + return res; +} + /* * Translates a host ptr back to a RAMBlock, a ram_addr and an offset * in that RAMBlock. diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index 74341b19d2..0d861a6289 100644 --- a/include/exec/cpu-common.h +++ b/include/exec/cpu-common.h @@ -68,6 +68,7 @@ ram_addr_t qemu_ram_addr_from_host(void *ptr); RAMBlock *qemu_ram_block_by_name(const char *name); RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset, ram_addr_t *offset); +ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host); void qemu_ram_set_idstr(RAMBlock *block, const char *name, DeviceState *dev); void qemu_ram_unset_idstr(RAMBlock *block); const char *qemu_ram_get_idstr(RAMBlock *rb); -- 2.14.3