From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50977) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ey7mO-0006jr-6I for qemu-devel@nongnu.org; Mon, 19 Mar 2018 23:17:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ey7mM-0008EL-Kv for qemu-devel@nongnu.org; Mon, 19 Mar 2018 23:17:40 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:56998 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 1ey7mM-0008E5-Fw for qemu-devel@nongnu.org; Mon, 19 Mar 2018 23:17:38 -0400 Date: Tue, 20 Mar 2018 05:17:35 +0200 From: "Michael S. Tsirkin" Message-ID: <1521515720-612046-24-git-send-email-mst@redhat.com> References: <1521515720-612046-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1521515720-612046-1-git-send-email-mst@redhat.com> Subject: [Qemu-devel] [PULL v2 23/50] qemu_ram_block_host_offset List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , "Dr. David Alan Gilbert" , Peter Xu , Paolo Bonzini , Peter Crosthwaite , Richard Henderson 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 Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/exec/cpu-common.h | 1 + exec.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index 74341b1..0d861a6 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); diff --git a/exec.c b/exec.c index 34fdfd9..2199b09 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. -- MST