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-rw-r--r--win/tclWin32Dll.c151
1 files changed, 150 insertions, 1 deletions
diff --git a/win/tclWin32Dll.c b/win/tclWin32Dll.c
index f65b706..def7996 100644
--- a/win/tclWin32Dll.c
+++ b/win/tclWin32Dll.c
@@ -9,7 +9,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclWin32Dll.c,v 1.35 2004/04/24 07:45:58 davygrvy Exp $
+ * RCS: @(#) $Id: tclWin32Dll.c,v 1.36 2004/06/05 17:31:08 kennykb Exp $
*/
#include "tclWinInt.h"
@@ -995,3 +995,152 @@ Tcl_WinTCharToUtf(string, len, dsPtr)
return Tcl_ExternalToUtfDString(tclWinTCharEncoding,
(CONST char *) string, len, dsPtr);
}
+
+/*
+ *------------------------------------------------------------------------
+ *
+ * TclWinCPUID --
+ *
+ * Get CPU ID information on an Intel box under Windows
+ *
+ * Results:
+ * Returns TCL_OK if successful, TCL_ERROR if CPUID is not
+ * supported or fails.
+ *
+ * Side effects:
+ * If successful, stores EAX, EBX, ECX and EDX registers after
+ * the CPUID instruction in the four integers designated by 'regsPtr'
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclWinCPUID( unsigned int index, /* Which CPUID value to retrieve */
+ register unsigned int * regsPtr ) /* Registers after the CPUID */
+{
+
+ int status = TCL_ERROR;
+
+#if defined(__GNUC__)
+
+ /* Establish structured exception handling */
+
+# ifdef HAVE_NO_SEH
+ __asm__ __volatile__ (
+ "pushl %ebp" "\n\t"
+ "pushl $__except_TclWinCPUID_detach_handler" "\n\t"
+ "pushl %fs:0" "\n\t"
+ "movl %esp, %fs:0" );
+# else
+ __try {
+# endif
+
+ /*
+ * Execute the CPUID instruction with the given index, and
+ * store results off 'regPtr'.
+ */
+
+ __asm__ __volatile__ (
+ "movl %4, %%eax" "\n\t"
+ "cpuid" "\n\t"
+ "movl %%eax, %0" "\n\t"
+ "movl %%ebx, %1" "\n\t"
+ "movl %%ecx, %2" "\n\t"
+ "movl %%edx, %3"
+ :
+ "=m"(regsPtr[0]),
+ "=m"(regsPtr[1]),
+ "=m"(regsPtr[2]),
+ "=m"(regsPtr[3])
+ : "m"(index)
+ : "%eax", "%ebx", "%ecx", "%edx" );
+ status = TCL_OK;
+
+ /* End the structured exception handler */
+
+# ifndef HAVE_NO_SEH
+ } __except( EXCEPTION_EXECUTE_HANDLER ) {
+ /* do nothing */
+ }
+# else
+ __asm __volatile__ (
+ "jmp TclWinCPUID_detach_pop" "\n"
+ "TclWinCPUID_detach_reentry:" "\n\t"
+ "movl %%fs:0, %%eax" "\n\t"
+ "movl 0x8(%%eax), %%esp" "\n\t"
+ "movl 0x8(%%esp), %%ebp" "\n"
+ "TclWinCPUID_detach_pop:" "\n\t"
+ "movl (%%esp), %%eax" "\n\t"
+ "movl %%eax, %%fs:0" "\n\t"
+ "add $12, %%esp" "\n\t"
+ :
+ :
+ : "%eax");
+# endif
+
+
+#elif defined(_MSC_VER)
+
+ /* Define a structure in the stack frame to hold the registers */
+
+ struct {
+ DWORD dw0;
+ DWORD dw1;
+ DWORD dw2;
+ DWORD dw3;
+ } regs;
+ regs.dw0 = index;
+
+ /* Execute the CPUID instruction and save regs in the stack frame */
+
+ _try {
+ _asm {
+ push ebx
+ push ecx
+ push edx
+ mov eax, regs.dw0
+ cpuid
+ mov regs.dw0, eax
+ mov regs.dw1, ebx
+ mov regs.dw2, ecx
+ mov regs.dw3, edx
+ pop edx
+ pop ecx
+ pop ebx
+ }
+
+ /* Copy regs back out to the caller */
+
+ regsPtr[0]=regs.dw0;
+ regsPtr[1]=regs.dw1;
+ regsPtr[2]=regs.dw2;
+ regsPtr[3]=regs.dw3;
+
+ status = TCL_OK;
+ } __except( EXCEPTION_EXECUTE_HANDLER ) {
+ }
+
+#else
+ /* Don't know how to do assembly code for
+ * this compiler */
+#endif
+ return status;
+}
+
+#if defined( __GNUC__ ) && defined( HAVE_NO_SEH )
+static __attribute__((cdecl)) EXCEPTION_DISPOSITION
+_except_TclWinCPUID_detach_handler(
+ struct _EXCEPTION_RECORD *ExceptionRecord,
+ void *EstablisherFrame,
+ struct _CONTEXT *ContextRecord,
+ void *DispatcherContext)
+{
+ __asm__ __volatile__ (
+ "jmp TclWinCPUID_detach_reentry" );
+ /* Nuke compiler warning about unused static function */
+ _except_TclWinCPUID_detach_handler(NULL, NULL, NULL, NULL);
+ return 0; /* Function does not return */
+}
+#endif
+
+