diff options
Diffstat (limited to 'arch/i386/kernel/traps.c')
| -rw-r--r-- | arch/i386/kernel/traps.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c index ab0e9430f775..53ad954e3ba4 100644 --- a/arch/i386/kernel/traps.c +++ b/arch/i386/kernel/traps.c @@ -306,14 +306,17 @@ void die(const char * str, struct pt_regs * regs, long err) .lock_owner_depth = 0 }; static int die_counter; + unsigned long flags; if (die.lock_owner != raw_smp_processor_id()) { console_verbose(); - spin_lock_irq(&die.lock); + spin_lock_irqsave(&die.lock, flags); die.lock_owner = smp_processor_id(); die.lock_owner_depth = 0; bust_spinlocks(1); } + else + local_save_flags(flags); if (++die.lock_owner_depth < 3) { int nl = 0; @@ -340,7 +343,7 @@ void die(const char * str, struct pt_regs * regs, long err) bust_spinlocks(0); die.lock_owner = -1; - spin_unlock_irq(&die.lock); + spin_unlock_irqrestore(&die.lock, flags); if (kexec_should_crash(current)) crash_kexec(regs); @@ -1075,9 +1078,9 @@ void __init trap_init(void) set_trap_gate(0,÷_error); set_intr_gate(1,&debug); set_intr_gate(2,&nmi); - set_system_intr_gate(3, &int3); /* int3-5 can be called from all */ + set_system_intr_gate(3, &int3); /* int3/4 can be called from all */ set_system_gate(4,&overflow); - set_system_gate(5,&bounds); + set_trap_gate(5,&bounds); set_trap_gate(6,&invalid_op); set_trap_gate(7,&device_not_available); set_task_gate(8,GDT_ENTRY_DOUBLEFAULT_TSS); @@ -1095,6 +1098,28 @@ void __init trap_init(void) #endif set_trap_gate(19,&simd_coprocessor_error); + if (cpu_has_fxsr) { + /* + * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned. + * Generates a compile-time "error: zero width for bit-field" if + * the alignment is wrong. + */ + struct fxsrAlignAssert { + int _:!(offsetof(struct task_struct, + thread.i387.fxsave) & 15); + }; + + printk(KERN_INFO "Enabling fast FPU save and restore... "); + set_in_cr4(X86_CR4_OSFXSR); + printk("done.\n"); + } + if (cpu_has_xmm) { + printk(KERN_INFO "Enabling unmasked SIMD FPU exception " + "support... "); + set_in_cr4(X86_CR4_OSXMMEXCPT); + printk("done.\n"); + } + set_system_gate(SYSCALL_VECTOR,&system_call); /* |