Add qemu 2.4.0

[kvmfornfv.git] / qemu / linux-user / uname.c

diff --git a/qemu/linux-user/uname.c b/qemu/linux-user/uname.c
new file mode 100644 (file)
index 0000000..1e6560d
--- /dev/null
+++ b/qemu/linux-user/uname.c
@@ -0,0 +1,169 @@
+/*
+ *  cpu to uname machine name map
+ *
+ *  Copyright (c) 2009 Loïc Minier
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+
+#include "qemu.h"
+//#include "qemu-common.h"
+#include "uname.h"
+
+/* return highest utsname machine name for emulated instruction set
+ *
+ * NB: the default emulated CPU ("any") might not match any existing CPU, e.g.
+ * on ARM it has all features turned on, so there is no perfect arch string to
+ * return here */
+const char *cpu_to_uname_machine(void *cpu_env)
+{
+#if defined(TARGET_ARM) && !defined(TARGET_AARCH64)
+
+    /* utsname machine name on linux arm is CPU arch name + endianness, e.g.
+     * armv7l; to get a list of CPU arch names from the linux source, use:
+     *     grep arch_name: -A1 linux/arch/arm/mm/proc-*.S
+     * see arch/arm/kernel/setup.c: setup_processor()
+     */
+
+    /* in theory, endianness is configurable on some ARM CPUs, but this isn't
+     * used in user mode emulation */
+#ifdef TARGET_WORDS_BIGENDIAN
+#define utsname_suffix "b"
+#else
+#define utsname_suffix "l"
+#endif
+    if (arm_feature(cpu_env, ARM_FEATURE_V7))
+        return "armv7" utsname_suffix;
+    if (arm_feature(cpu_env, ARM_FEATURE_V6))
+        return "armv6" utsname_suffix;
+    /* earliest emulated CPU is ARMv5TE; qemu can emulate the 1026, but not its
+     * Jazelle support */
+    return "armv5te" utsname_suffix;
+#elif defined(TARGET_I386) && !defined(TARGET_X86_64)
+    /* see arch/x86/kernel/cpu/bugs.c: check_bugs(), 386, 486, 586, 686 */
+    CPUState *cpu = ENV_GET_CPU((CPUX86State *)cpu_env);
+    int family = object_property_get_int(OBJECT(cpu), "family", NULL);
+    if (family == 4) {
+        return "i486";
+    }
+    if (family == 5) {
+        return "i586";
+    }
+    return "i686";
+#else
+    /* default is #define-d in each arch/ subdir */
+    return UNAME_MACHINE;
+#endif
+}
+
+
+#define COPY_UTSNAME_FIELD(dest, src) \
+  do { \
+      /* __NEW_UTS_LEN doesn't include terminating null */ \
+      (void) strncpy((dest), (src), __NEW_UTS_LEN); \
+      (dest)[__NEW_UTS_LEN] = '\0'; \
+  } while (0)
+
+int sys_uname(struct new_utsname *buf)
+{
+  struct utsname uts_buf;
+
+  if (uname(&uts_buf) < 0)
+      return (-1);
+
+  /*
+   * Just in case these have some differences, we
+   * translate utsname to new_utsname (which is the
+   * struct linux kernel uses).
+   */
+
+  memset(buf, 0, sizeof(*buf));
+  COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
+  COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
+  COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
+  COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
+  COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
+#ifdef _GNU_SOURCE
+  COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
+#endif
+  return (0);
+
+#undef COPY_UTSNAME_FIELD
+}
+
+static int relstr_to_int(const char *s)
+{
+    /* Convert a uname release string like "2.6.18" to an integer
+     * of the form 0x020612. (Beware that 0x020612 is *not* 2.6.12.)
+     */
+    int i, n, tmp;
+
+    tmp = 0;
+    for (i = 0; i < 3; i++) {
+        n = 0;
+        while (*s >= '0' && *s <= '9') {
+            n *= 10;
+            n += *s - '0';
+            s++;
+        }
+        tmp = (tmp << 8) + n;
+        if (*s == '.') {
+            s++;
+        }
+    }
+    return tmp;
+}
+
+int get_osversion(void)
+{
+    static int osversion;
+    struct new_utsname buf;
+    const char *s;
+
+    if (osversion)
+        return osversion;
+    if (qemu_uname_release && *qemu_uname_release) {
+        s = qemu_uname_release;
+    } else {
+        if (sys_uname(&buf))
+            return 0;
+        s = buf.release;
+    }
+    osversion = relstr_to_int(s);
+    return osversion;
+}
+
+void init_qemu_uname_release(void)
+{
+    /* Initialize qemu_uname_release for later use.
+     * If the host kernel is too old and the user hasn't asked for
+     * a specific fake version number, we might want to fake a minimum
+     * target kernel version.
+     */
+    struct new_utsname buf;
+
+    if (qemu_uname_release && *qemu_uname_release) {
+        return;
+    }
+
+    if (sys_uname(&buf)) {
+        return;
+    }
+
+    if (relstr_to_int(buf.release) < relstr_to_int(UNAME_MINIMUM_RELEASE)) {
+        qemu_uname_release = UNAME_MINIMUM_RELEASE;
+    }
+}