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| author | Harvey Harrison <harvey.harrison@gmail.com> | 2008-01-30 13:34:09 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:09 +0100 |
| commit | 29caf2f98cdb266dffb50dfd412f951e8d46f719 (patch) | |
| tree | 26f5acdb73635c4921b38a375c15f40a9e9ec3ee /arch/x86/mm/fault_64.c | |
| parent | 9af993a92623e022c176459fa6607a564b9a7eaf (diff) | |
| download | lwn-29caf2f98cdb266dffb50dfd412f951e8d46f719.tar.gz lwn-29caf2f98cdb266dffb50dfd412f951e8d46f719.zip | |
x86: add is_f00f_bug helper to fault_32|64.c
Further towards unifying these files, add another helper
in same spirit as is_errata93.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/fault_64.c')
| -rw-r--r-- | arch/x86/mm/fault_64.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c index dd26e680a431..df13487aa83a 100644 --- a/arch/x86/mm/fault_64.c +++ b/arch/x86/mm/fault_64.c @@ -256,6 +256,27 @@ static int is_errata93(struct pt_regs *regs, unsigned long address) return 0; } +void do_invalid_op(struct pt_regs *, unsigned long); + +static int is_f00f_bug(struct pt_regs *regs, unsigned long address) +{ +#ifdef CONFIG_X86_F00F_BUG + unsigned long nr; + /* + * Pentium F0 0F C7 C8 bug workaround. + */ + if (boot_cpu_data.f00f_bug) { + nr = (address - idt_descr.address) >> 3; + + if (nr == 6) { + do_invalid_op(regs, 0); + return 1; + } + } +#endif + return 0; +} + static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs, unsigned long error_code) { @@ -581,6 +602,9 @@ bad_area_nosemaphore: return; } + if (is_f00f_bug(regs, address)) + return; + no_context: /* Are we prepared to handle this kernel fault? */ if (fixup_exception(regs)) |