I've found that file bugs.h is not properly marked with
initfuncs... I also found out that it is pretty easy to test for
pushad/popad bug, so I added test for it. Might be good thing, as this
will remind people that their i386 is unreliable...
Pavel
[Patch against 2.1.47, should be applied in include/asm-i386]
Index: bugs.h
===================================================================
RCS file: /home/pavel/cvsroot/linux/include/asm-i386/bugs.h,v
retrieving revision 1.2
diff -u -r1.2 bugs.h
--- bugs.h 1997/07/08 12:15:09 1.2
+++ bugs.h 1997/07/30 20:24:52
@@ -15,12 +15,12 @@
#define CONFIG_BUGi386
-static void no_halt(char *s, int *ints)
+__initfunc( static void no_halt(char *s, int *ints) )
{
hlt_works_ok = 0;
}
-static void no_387(char *s, int *ints)
+__initfunc( static void no_387(char *s, int *ints) )
{
hard_math = 0;
__asm__("movl %%cr0,%%eax\n\t"
@@ -30,7 +30,7 @@
static char fpu_error = 0;
-static void copro_timeout(void)
+__initfunc( static void copro_timeout(void) )
{
fpu_error = 1;
timer_table[COPRO_TIMER].expires = jiffies+100;
@@ -41,7 +41,7 @@
outb_p(0,0xf0);
}
-static void check_fpu(void)
+__initfunc( static void check_fpu(void) )
{
static double x = 4195835.0;
static double y = 3145727.0;
@@ -94,12 +94,11 @@
if (!fdiv_bug) {
printk("Ok, fpu using exception 16 error reporting.\n");
return;
-
}
printk("Hmm, FDIV bug i%c86 system\n", '0'+x86);
}
-static void check_hlt(void)
+__initfunc( static void check_hlt(void) )
{
printk(KERN_INFO "Checking 'hlt' instruction... ");
if (!hlt_works_ok) {
@@ -110,7 +109,7 @@
printk("Ok.\n");
}
-static void check_tlb(void)
+__initfunc( static void check_tlb(void) )
{
#ifndef CONFIG_M386
/*
@@ -125,10 +124,28 @@
#endif
}
-static void check_bugs(void)
+__initfunc( static void check_popad(void) )
+{
+#ifdef CONFIG_M386
+ int res, inp = (int) &res;
+
+ printk(KERN_INFO "Checking for popad bug...");
+ __asm__ __volatile__(
+ "movl $12345678,%%eax; movl $0,%%edi; pusha; popa; movl (%%edx,%%edi),%%ecx "
+ : "=eax" (res)
+ : "edx" (inp)
+ : "eax", "ecx", "edx", "edi" );
+ /* If this fails, it means that any user program may lock CPU hard. Too bad. */
+ if (res != 12345678) printk( "Even worse.\n" );
+ else printk( "Ok.\n" );
+#endif
+}
+
+__initfunc( static void check_bugs(void) )
{
check_tlb();
check_fpu();
check_hlt();
+ check_popad();
system_utsname.machine[1] = '0' + x86;
}
-- I'm really pavel@atrey.karlin.mff.cuni.cz. Pavel Look at http://atrey.karlin.mff.cuni.cz/~pavel/ ;-).