Message ID | 1470133216-6758-2-git-send-email-vijay.kilari@gmail.com |
---|---|
State | New |
Headers | show |
On 2 August 2016 at 11:20, <vijay.kilari@gmail.com> wrote: > +long int qemu_read_cpuid_info(void) Don't use "long" here, it might be 32 or 64 bits. The kernel ABI for the /sys/ file we're reading says it is a 64-bit value, so uint64_t is what you want. > +{ > + 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; > + } g_file_get_contents() is probably easier than manually opening the file and reading it into an allocated buffer. > + > + if (qemu_strtol(buf, NULL, 0, &midr) < 0) { qemu_strtoull(). > + goto out; > + } > + > +out: > + g_free(buf); > + fclose(fp); > + > + return midr; > +} > +#endif > -- > 1.7.9.5 > thanks -- PMM
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 <Vijaya.Kumar@cavium.com> + * + * 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