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CoreMod

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-
===== Source file =====
+
=== How To ===
-
<syntaxhighlight lang="c" line start="1">
+
==== Requirements ====
-
// coremod.c - CyrIng 2012
+
Mandatory,
 +
* The GNU/Linux x86_64 3.x : [http://www.kernel.org/ linux]<br />
 +
* The GNU Compiler Collection: [http://gcc.gnu.org gcc] - or - The C language family frontend for LLVM: [http://clang.llvm.org/ clang]<br />
 +
* Being root !
 +
* The Intel(R) Core(TM) i7, i5 Processors<br />
 +
<br />
 +
Optionally,
 +
* The GNU Debugger: [http://www.gnu.org/software/gdb/ gdb]<br />
 +
* and a graphical front-end for gdb: [http://www.gnu.org/software/ddd/ ddd]<br />
 +
* The [http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-vol-3a-3b-system-programming-manual.html Intel 64 and IA-32 Architectures Software Developer’s Manual] Volume 3<br />
 +
* The [http://www.dmtf.org/standards/smbios SMBIOS Reference Specification] (C) Distributed Management Task Force<br />
 +
<br />
 +
==== Compiling ====
 +
<syntaxhighlight lang="bash">
 +
$ make
 +
</syntaxhighlight>
 +
<pre>
 +
Compiling : Done.
 +
Linking  : Done.
 +
Ready    : ./bin/coremod
 +
Remark    : You must be root to run CoreMod
 +
</pre>
 +
<br />
-
#include <stdio.h>
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==== Debugging ====
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#include <stdlib.h>
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First of all, compile sources with the -g switch enabled, if not already, in the Makefile's CFLAGS, then launch the debugger<br />
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#include <unistd.h>
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<syntaxhighlight lang="c">
-
#include <sys/stat.h>
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$ kdesu ddd ./bin/coremod
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#include <fcntl.h>
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</syntaxhighlight>
 +
<br />
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// Intel® 64 and IA-32 Architectures Software Developer’s Manual
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==== Usage ====
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// Vol. 3C § 34-1
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Two kernel modules must be loaded
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// Table 34-2. IA-32 Architectural MSRs
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# msr
 +
# dmi-sysfs
 +
<br />
 +
Execute CoreMod as root
 +
<syntaxhighlight lang="bash">
 +
# ./coremod
 +
</syntaxhighlight>
 +
<br />
 +
http://blog.cyring.fr/wp-content/uploads/2012/07/CyrIng_coremod_screen12.jpg
 +
<br /><br />
 +
Usage is straightforward. Just enter the corresponding initial character to the function you want to execute.
 +
<br />
 +
Thus to show the core temperature, press the following keys:<br />
 +
* [s]
 +
* [Enter]
 +
* [c]
 +
* [Enter]
 +
and for instance, to go back to previous menu level:<br />
 +
* [<]
 +
* [Enter]
 +
<br />
 +
Discover the other functions to dump your components !
 +
<br /><br />
 +
http://blog.cyring.fr/wp-content/uploads/2012/07/CyrIng_coremod_screen17.jpg
 +
<br />
 +
<br />
-
#define IA32_PERF_STATUS 0x198
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=== Contact ===
 +
Feel free to [http://blog.cyring.fr/about/?lang=en contact] us for any suggestion or question.
 +
<br />
 +
<br />
-
// System Management BIOS (SMBIOS) Reference Specification
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=== Versions ===
-
// Version: 2.7.1 § 7.5
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===== Nightly Build =====
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// Table 20 – Processor Information (Type 4) Structure
+
:[http://code.cyring.fr/FTS/?PATH=Source/C/CoreMod/Nightly_Build/Latest Latest]
-
#define SMBIOS_PROCINFO_STRUCTURE 4
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===== Release 2012-0.1.4 =====
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#define SMBIOS_PROCINFO_INSTANCE 0
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:[http://code.cyring.fr/FTS/?PATH=Source/C/CoreMod/Previous_Build/2012-0.1.4 2012-0.1.4]
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#define SMBIOS_PROCINFO_EXTCLK 0x12
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===== Release 2012-0.1.3 =====
-
 
+
:[http://code.cyring.fr/FTS/?PATH=Source/C/CoreMod/Previous_Build/2012-0.1.3 2012-0.1.3]
-
 
+
===== Release 2012-0.1.2 =====
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int Read_MSR(int cpu, off_t offset, unsigned long long *msr) {
+
:[http://code.cyring.fr/FTS/?PATH=Source/C/CoreMod/Previous_Build/2012-0.1.2 2012-0.1.2]
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ssize_t retval=0;
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===== Release 2012-0.1.1 =====
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char pathname[32]="";
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:[http://code.cyring.fr/FTS/?PATH=Source/C/CoreMod/Previous_Build/2012-0.1.1 2012-0.1.1]
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int fd=0, rc=-1;
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-
 
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sprintf(pathname, "/dev/cpu/%d/msr", cpu);
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if( (fd=open(pathname, O_RDONLY)) != -1 ) {
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retval=pread(fd, msr, sizeof *msr, offset);
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close(fd);
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rc=(retval != sizeof *msr) ? -1 : 0;
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}
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return(rc);
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}
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-
 
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int Read_SMBIOS(int structure, int instance, off_t offset, void *buf, size_t nbyte) {
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ssize_t retval=0;
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char pathname[]="/sys/firmware/dmi/entries/999-99/raw";
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int fd=0, rc=-1;
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sprintf(pathname, "/sys/firmware/dmi/entries/%d-%d/raw", structure, instance);
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if( (fd=open(pathname, O_RDONLY)) != -1 ) {
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retval=pread(fd, buf, nbyte, offset);
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close(fd);
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rc=(retval != nbyte) ? -1 : 0;
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}
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return(rc);
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}
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-
 
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int Get_Ratio(int target) {
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unsigned long long msr=0;
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-
 
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if( Read_MSR(target, IA32_PERF_STATUS, &msr) != -1)
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return((int) msr);
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else
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return(0);
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}
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-
 
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int External_Clock() {
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int clock=0;
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if( Read_SMBIOS(SMBIOS_PROCINFO_STRUCTURE, SMBIOS_PROCINFO_INSTANCE, SMBIOS_PROCINFO_EXTCLK, &clock, 1) != -1)
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return(clock);
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else
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return(0);
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}
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-
 
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int main(int argc, char *argv[]) {
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int target=0, first=0, last=0, clock=0, ratio=0, rc=0;
+
-
+
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switch(argc) {
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  case 2: first = atoi(argv[1]);
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last  = first;
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  break;
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-
  case 3: first = atoi(argv[1]);
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-
last  = atoi(argv[2]);
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  break;
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}
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if((clock=External_Clock())!=0)
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  for(target=first; target<=last && (ratio=Get_Ratio(target)) != 0; target++)
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printf("Processor#%d : Ratio[%d] x Clock[%d] = %d Mhz\n", target, ratio, clock, ratio*clock);
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else
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rc=-1;
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return(rc);
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}
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</syntaxhighlight>
+
-
<br />
+
-
===== Compiling and debugging file =====
+
-
<syntaxhighlight lang="c">
+
-
$ gcc -g coremod.c -o coremod
+
-
$ kdesu ddd ./coremod
+
-
</syntaxhighlight>
+

Latest revision as of 10:04, 19 November 2012

Contents

How To

Requirements

Mandatory,

  • The GNU/Linux x86_64 3.x : linux
  • The GNU Compiler Collection: gcc - or - The C language family frontend for LLVM: clang
  • Being root !
  • The Intel(R) Core(TM) i7, i5 Processors


Optionally,


Compiling 

$ make
Compiling : Done.
Linking   : Done.
Ready     : ./bin/coremod
Remark    : You must be root to run CoreMod


Debugging

First of all, compile sources with the -g switch enabled, if not already, in the Makefile's CFLAGS, then launch the debugger

$ kdesu ddd ./bin/coremod


Usage

Two kernel modules must be loaded

  1. msr
  2. dmi-sysfs


Execute CoreMod as root 

# ./coremod


CyrIng_coremod_screen12.jpg

Usage is straightforward. Just enter the corresponding initial character to the function you want to execute.
Thus to show the core temperature, press the following keys:

  • [s]
  • [Enter]
  • [c]
  • [Enter]

and for instance, to go back to previous menu level:

  • [<]
  • [Enter]


Discover the other functions to dump your components !

CyrIng_coremod_screen17.jpg

Contact

Feel free to contact us for any suggestion or question.

Versions

Nightly Build
Latest
Release 2012-0.1.4
2012-0.1.4
Release 2012-0.1.3
2012-0.1.3
Release 2012-0.1.2
2012-0.1.2
Release 2012-0.1.1
2012-0.1.1
Retrieved from "http://cyring.free.fr/index.php?title=CoreMod"
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