Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / tools / power / cpupower / debug / i386 / centrino-decode.c

diff --git a/kernel/tools/power/cpupower/debug/i386/centrino-decode.c b/kernel/tools/power/cpupower/debug/i386/centrino-decode.c
new file mode 100644 (file)
index 0000000..7ef24cc
--- /dev/null
+++ b/kernel/tools/power/cpupower/debug/i386/centrino-decode.c
@@ -0,0 +1,113 @@
+/*
+ *  (C) 2003 - 2004  Dominik Brodowski <linux@dominikbrodowski.de>
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ *
+ * Based on code found in
+ * linux/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+ * and originally developed by Jeremy Fitzhardinge.
+ *
+ * USAGE: simply run it to decode the current settings on CPU 0,
+ *       or pass the CPU number as argument, or pass the MSR content
+ *       as argument.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define MCPU   32
+
+#define MSR_IA32_PERF_STATUS   0x198
+
+static int rdmsr(unsigned int cpu, unsigned int msr,
+                unsigned int *lo, unsigned int *hi)
+{
+       int fd;
+       char file[20];
+       unsigned long long val;
+       int retval = -1;
+
+       *lo = *hi = 0;
+
+       if (cpu > MCPU)
+               goto err1;
+
+       sprintf(file, "/dev/cpu/%d/msr", cpu);
+       fd = open(file, O_RDONLY);
+
+       if (fd < 0)
+               goto err1;
+
+       if (lseek(fd, msr, SEEK_CUR) == -1)
+               goto err2;
+
+       if (read(fd, &val, 8) != 8)
+               goto err2;
+
+       *lo = (uint32_t )(val & 0xffffffffull);
+       *hi = (uint32_t )(val>>32 & 0xffffffffull);
+
+       retval = 0;
+err2:
+       close(fd);
+err1:
+       return retval;
+}
+
+static void decode (unsigned int msr)
+{
+       unsigned int multiplier;
+       unsigned int mv;
+
+       multiplier = ((msr >> 8) & 0xFF);
+
+       mv = (((msr & 0xFF) * 16) + 700);
+
+       printf("0x%x means multiplier %d @ %d mV\n", msr, multiplier, mv);
+}
+
+static int decode_live(unsigned int cpu)
+{
+       unsigned int lo, hi;
+       int err;
+
+       err = rdmsr(cpu, MSR_IA32_PERF_STATUS, &lo, &hi);
+
+       if (err) {
+               printf("can't get MSR_IA32_PERF_STATUS for cpu %d\n", cpu);
+               printf("Possible trouble: you don't run an Enhanced SpeedStep capable cpu\n");
+               printf("or you are not root, or the msr driver is not present\n");
+               return 1;
+       }
+
+       decode(lo);
+
+       return 0;
+}
+
+int main (int argc, char **argv)
+{
+       unsigned int cpu, mode = 0;
+
+       if (argc < 2)
+               cpu = 0;
+       else {
+               cpu = strtoul(argv[1], NULL, 0);
+               if (cpu >= MCPU)
+                       mode = 1;
+       }
+
+       if (mode)
+               decode(cpu);
+       else
+               decode_live(cpu);
+
+       return 0;
+}