This Old Box (or errors building 2.0.38 on a K5)

Dick Balaska (dick@buckosoft.com)
Tue, 21 Sep 1999 12:49:02 -0400

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Dudes and/or Dudettes:

Extreme apologies if this has been discussed. I spent only 3-4 hours
surfing for answers (insignificant dent in the terabytes of info)

sarah is a box of usual extreme uptimes. Before Hurricane Floyd went through
the other day, she'd been rebooted once since 2.0.13 was minty fresh.
(silly brag page: http://www.buckosoft.com/linux/ )

So i decided to take this opportunity to upgrade the kernel;
remembering reading about important TCP/IP fixes around 2.0.34ish.

sarah is an AMD K5. I build using -m486.
2.0.38 and i have a problem with include/asm/bugs.h .
It seems that there are these macros rdmsr() and wrmsr()
which are used in check_privacy(void) (line 179);
a function to disable PIII serial numbers.
Also there is a problem with check_k6_bug()

I did notice in my surf that 2.0.25 had a similar problem
with time.c

I crap out with:
gcc -D__KERNEL__ -I/u1/src/linux-2.0.38/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strength-reduce -pipe -m486 -DCPU=486 -c -o init/main.o init/main.c
{standard input}: Assembler messages:
{standard input}:283: Error: no such 386 instruction: `rdmsr'
{standard input}:287: Error: no such 386 instruction: `wrmsr'
{standard input}:345: Error: no such 386 instruction: `rdtsc'
{standard input}:357: Error: no such 386 instruction: `rdtsc'
make: *** [init/main.o] Error 1

2.0.34 builds ok (the next nearest version i had laying around)

I patched these in a similar fashion to this older technique
(time.c had rdmsr patched to equivalent .byte codes)
http://www.uwsg.indiana.edu/hypermail/linux/kernel/9611.1/0101.html

-- 
           _,--"
dik        `-._        ________-_______        "----
       _----'--'--------------------------------'--'----_
      //_| | \        dick@buckosoft.com          / | |_\\
     (_____|_|__= Guilford CT +1.203.458.0389  =__|_|_____)
     _\_____=___   http://www.buckosoft.com     ___=_____/_
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Early Klingon Poetry:
Wustl, Wustl, ERR RIP MIT BOOT, BIND Wustl
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--- linux-2.0.38.orig/include/asm-i386/bugs.h	Sun Jun 13 13:21:03 1999
+++ linux-2.0.38/include/asm/bugs.h	Tue Sep 21 12:21:32 1999
@@ -140,12 +140,12 @@
  */
  
 #define rdmsr(msr,val1,val2) \
-       __asm__ __volatile__("rdmsr" \
+       __asm__ __volatile__(".byte 0x0f,0x32" \
 			    : "=a" (val1), "=d" (val2) \
 			    : "c" (msr))
 
 #define wrmsr(msr,val1,val2) \
-     __asm__ __volatile__("wrmsr" \
+     __asm__ __volatile__(".byte 0x0f,0x30" \
 			  : /* no outputs */ \
 			  : "c" (msr), "a" (val1), "d" (val2))
 
@@ -220,10 +220,10 @@
 
                 n = K6_BUG_LOOP;
                 f_vide = vide;
-                __asm__ ("rdtsc" : "=a" (d));
+                __asm__ (".byte 0x0f,0x31" : "=a" (d));		/* rdtsc() */
                 while (n--) 
                         f_vide();
-                __asm__ ("rdtsc" : "=a" (d2));
+                __asm__ (".byte 0x0f,0x31" : "=a" (d2));	/* rdtsc() */
                 d = d2-d;
 
                 if (d > 20*K6_BUG_LOOP) {


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