From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55110) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bUWoo-00053g-4t for qemu-devel@nongnu.org; Tue, 02 Aug 2016 06:21:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bUWoj-00040D-12 for qemu-devel@nongnu.org; Tue, 02 Aug 2016 06:21:02 -0400 From: vijay.kilari@gmail.com Date: Tue, 2 Aug 2016 15:50:15 +0530 Message-Id: <1470133216-6758-2-git-send-email-vijay.kilari@gmail.com> In-Reply-To: <1470133216-6758-1-git-send-email-vijay.kilari@gmail.com> References: <1470133216-6758-1-git-send-email-vijay.kilari@gmail.com> Subject: [Qemu-devel] [RFC PATCH v1 1/2] utils: Add helper to read arm MIDR_EL1 register List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-arm@nongnu.org, peter.maydell@linaro.org, pbonzini@redhat.com Cc: qemu-devel@nongnu.org, Prasun.Kapoor@cavium.com, vijay.kilari@gmail.com, Vijaya Kumar K From: Vijaya Kumar K Add helper API to read MIDR_EL1 registers to fetch cpu identification information. This helps in adding errata's and architecture specific features. This is implemented only for arm architecture. Signed-off-by: Vijaya Kumar K --- include/qemu-common.h | 1 + util/Makefile.objs | 1 + util/cpuinfo.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 54 insertions(+) diff --git a/include/qemu-common.h b/include/qemu-common.h index 1f2cb94..62ad674 100644 --- a/include/qemu-common.h +++ b/include/qemu-common.h @@ -134,4 +134,5 @@ void page_size_init(void); * returned. */ bool dump_in_progress(void); +long int qemu_read_cpuid_info(void); #endif diff --git a/util/Makefile.objs b/util/Makefile.objs index 96cb1e0..9d25a72 100644 --- a/util/Makefile.objs +++ b/util/Makefile.objs @@ -35,3 +35,4 @@ util-obj-y += log.o util-obj-y += qdist.o util-obj-y += qht.o util-obj-y += range.o +util-obj-y += cpuinfo.o diff --git a/util/cpuinfo.c b/util/cpuinfo.c new file mode 100644 index 0000000..3ba7194 --- /dev/null +++ b/util/cpuinfo.c @@ -0,0 +1,52 @@ +/* + * Dealing with arm cpu identification information. + * + * Copyright (C) 2016 Cavium, Inc. + * + * Authors: + * Vijaya Kumar K + * + * This work is licensed under the terms of the GNU LGPL, version 2.1 + * or later. See the COPYING.LIB file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "qemu/cutils.h" + +#if defined(__aarch64__) + +long int qemu_read_cpuid_info(void) +{ + FILE *fp; + char *buf; + long int midr = 0; +#define BUF_SIZE 32 + + fp = fopen("/sys/devices/system/cpu/cpu0/regs/identification/midr_el1", + "r"); + if (!fp) { + return 0; + } + + buf = g_malloc0(BUF_SIZE); + if (!buf) { + fclose(fp); + return 0; + } + + if (buf != fgets(buf, BUF_SIZE - 1, fp)) { + goto out; + } + + if (qemu_strtol(buf, NULL, 0, &midr) < 0) { + goto out; + } + +out: + g_free(buf); + fclose(fp); + + return midr; +} +#endif -- 1.7.9.5