Date: Sat, 31 Jul 1999 10:18:50 +0200 From: Thao et Hubert Tournier <hubert.tournier@online.fr> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/12896: Incorrect CPU model display at boot time Message-ID: <37A2B16A.D4159733@online.fr>
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>Number: 12896
>Category: kern
>Synopsis: Incorrect CPU model display at boot time
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Jul 31 01:20:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator: hubert.tournier@online.fr
>Release: FreeBSD 3.2-RELEASE i386
>Organization:
home
>Environment:
Only for machines with AMD processors.
>Description:
At boot time, I've the following display :
CPU: \^E (400.91-MHz 586-class CPU)
Origin = "AuthenticAMD" Id = 0x58c Stepping=12
Features=0x8021bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,PGE,MMX>
instead of :
CPU: AMD K6-2 (400.91-MHz 586-class CPU)
Origin = "AuthenticAMD" Id = 0x58c Stepping=12
Features=0x8021bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,PGE,MMX>
>How-To-Repeat:
Reboot. It's systematic.
>Fix:
In "/sys/i386/i386/identcpu.c", near line 313, the "cpu_model" variable
is
overwritten with the memcpy functions.
[...]
printcpuinfo(void)
{
[...]
do_cpuid(0x80000000, regs);
nreg = regs[0];
if (nreg >= 0x80000004) {
do_cpuid(0x80000002, regs);
memcpy(cpu_model, regs, sizeof regs);
do_cpuid(0x80000003, regs);
memcpy(cpu_model+16, regs, sizeof regs);
do_cpuid(0x80000004, regs);
memcpy(cpu_model+32, regs, sizeof regs);
}
[...]
}
[...]
Obviously, the cpu_model variable, a string, was not meant to receive
integer values.
As I don't understand the purpose of the do_cpuid function, I just wrap
this
part of the code with the following lines :
{
char cpu_model_backup[128];
[...]
strcpy(cpu_model_backup, cpu_model);
[block]
strcpy(cpu_model, cpu_model_backup);
[...]
It's a kludge but it fixes the problem ;-)
>Release-Note:
>Audit-Trail:
>Unformatted:
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