diff options
Diffstat (limited to 'include/asm-i386/bugs.h')
| -rw-r--r-- | include/asm-i386/bugs.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/include/asm-i386/bugs.h b/include/asm-i386/bugs.h index 2e83b1b48..b7f2e1507 100644 --- a/include/asm-i386/bugs.h +++ b/include/asm-i386/bugs.h @@ -142,7 +142,7 @@ __initfunc(static void check_popad(void)) : "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( "Bad.\n" ); + if (res != 12345678) printk( "Buggy.\n" ); else printk( "Ok.\n" ); #endif } @@ -166,6 +166,28 @@ __initfunc(static void check_amd_k6(void)) } } +/* + * All current models of Pentium and Pentium with MMX technology CPUs + * have the F0 0F bug, which lets nonpriviledged users lock up the system: + */ + +extern int pentium_f00f_bug; +extern void trap_init_f00f_bug(void); + + +__initfunc(static void check_pentium_f00f(void)) +{ + /* + * Pentium and Pentium MMX + */ + pentium_f00f_bug = 0; + if (x86==5 && !memcmp(x86_vendor_id, "GenuineIntel", 12)) { + printk(KERN_INFO "Intel Pentium with F0 0F bug - workaround enabled.\n"); + pentium_f00f_bug = 1; + trap_init_f00f_bug(); + } +} + __initfunc(static void check_bugs(void)) { check_tlb(); @@ -173,5 +195,6 @@ __initfunc(static void check_bugs(void)) check_hlt(); check_popad(); check_amd_k6(); + check_pentium_f00f(); system_utsname.machine[1] = '0' + x86; } |