curses, sent it to a nonexistant mail address before. Anyways, does anyone
have any time to look at this, and tell me why it's a bad idea?
---------- Forwarded Message ----------
Subject: Re: i386/26994: AMD Athlon Thunderbird not known to identcpu.c
Date: Sat, 16 Jun 2001 17:32:06 -0400
From: Brian Mitchell <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED], [EMAIL PROTECTED]
I don't have a thundrbird, but has far as I know, k6-2+ supports the extended
cpuid functions, so something like the following may be appropriate. This
worked on my k6-2 and didnt break on any of my other machines (without the
#if defined guards, in my case), but I don't know if there are some oddball
686es that either dont support cpuid or dont support service 0x80000000 AND
do bad things when recieving it.
*** identcpu.c.old Sat Jun 16 16:39:34 2001
--- identcpu.c Sat Jun 16 17:19:16 2001
***************
*** 75,80 ****
--- 75,81 ----
static void print_AMD_info(u_int amd_maxregs);
static void print_AMD_assoc(int i);
static void do_cpuid(u_int ax, u_int *p);
+ static int do_ExtendedCPUID(char *buff);
u_int cyrix_did; /* Device ID of Cyrix CPU */
int cpu_class = CPUCLASS_386; /* least common denominator */
***************
*** 214,220 ****
cpu = CPU_PIII;
break;
default:
! strcat(cpu_model, "Unknown 80686");
break;
}
break;
--- 215,222 ----
cpu = CPU_PIII;
break;
default:
! if(do_ExtendedCPUID(cpu_model) < 0)
! strcat(cpu_model, "Unknown 80686");
break;
}
break;
***************
*** 223,229 ****
cpu = CPU_P4;
break;
default:
! strcat(cpu_model, "unknown");
break;
}
--- 225,232 ----
cpu = CPU_P4;
break;
default:
! if(do_ExtendedCPUID(cpu_model) < 0)
! strcat(cpu_model, "unknown");
break;
}
***************
*** 303,309 ****
strcat(cpu_model, "K6-III");
break;
default:
! strcat(cpu_model, "Unknown");
break;
}
#if defined(I586_CPU) && defined(CPU_WT_ALLOC)
--- 306,313 ----
strcat(cpu_model, "K6-III");
break;
default:
! if(do_ExtendedCPUID(cpu_model) < 0)
! strcat(cpu_model, "Unknown");
break;
}
#if defined(I586_CPU) && defined(CPU_WT_ALLOC)
***************
*** 1001,1003 ****
--- 1005,1078 ----
"\0403DNow!"
);
}
+
+ /*
+ * Get the model of the cpu if it is supported by the processor. This
+ * is probably the ideal way to determine the name of the cpu, if it
+ * is supported.
+ *
+ * Documentation on this can be found at:
+ *
http://developer.intel.com/design/processor/future/manuals/Cpuid_supplement.p
df + */
+ static int
+ do_ExtendedCPUID(char *buff)
+ {
+ #if defined(I686_CPU)
+ char cpustring[128];
+ unsigned int extCpuidFunc=0;
+
+ /* get the highest cpuid extended func supported */
+ __asm ("
+ movl $0x80000000, %%eax
+ cpuid
+ movl %%eax, %0"
+ : "=g" (extCpuidFunc)
+ :
+ : "eax");
+
+ /*
+ * if 0x80000002 - 0x80000004 are not supported, than this processor
+ * will not supply us the information we need. We should gracefully
+ * exit in that case.
+ */
+ if(extCpuidFunc < 0x80000004)
+ #endif
+ return -1;
+ #if defined(I686_CPU)
+
+ /*
+ * we can now use cpuid services 0x80000002-0x80000004 in order to
+ * fill our buffer 16 bytes at a time (total buffer provided can
+ * be up to 48 bytes).
+ */
+ __asm ("
+ cld
+ lea (%0), %%edi
+ movl $0x80000002, %%eax
+ cpuid
+ movl %%eax, (%%edi)
+ movl %%ebx, 4(%%edi)
+ movl %%ecx, 8(%%edi)
+ movl %%edx, 12(%%edi)
+ addl $16, %%edi
+ movl $0x80000003, %%edi
+ cpuid
+ movl %%eax, (%%edi)
+ movl %%ebx, 4(%%edi)
+ movl %%ecx, 8(%%edi)
+ movl %%edx, 12(%%edi)
+ addl $16, %%edi
+ movl $0x80000004, %%eax
+ cpuid
+ movl %%eax, (%%edi)
+ movl %%ebx, 4(%%edi)
+ movl %%ecx, 8(%%edi)
+ movl %%edx, 12(%%edi)"
+ :
+ : "g" (cpustring)
+ : "eax", "ebx", "ecx", "edx", "esp");
+ strcat(buff, cpustring);
+ return 0;
+ #endif
+ }
+
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