/*!
* @fn void cpumon_Save_Cpu(param)
*
* @param param - Unused, set up to enable parallel calls
*
* @return None No return needed
*
* @brief Set up the interrupt handler.
* @brief Save the old handler for restoration when done
*
*/
static VOID
cpumon_Save_Cpu (
PVOID parm
)
{
unsigned long eflags;
IDTGDT_DESC idt_base;
CPU_STATE pcpu = &pcb[CONTROL_THIS_CPU()];
GATE_STRUCT old_gate;
GATE_STRUCT *idt;
SYS_Local_Irq_Save(eflags);
SYS_Get_IDT_Base((PVOID*)&idt_base);
idt = idt_base.idtgdt_base;
CPU_STATE_idt_base(pcpu) = idt;
memcpy (&old_gate, &idt[CPU_PERF_VECTOR], 16);
CPU_STATE_saved_ih(pcpu) = (PVOID) ((((U64) old_gate.offset_high) << 32) |
(((U64) old_gate.offset_middle) << 16) |
((U64) old_gate.offset_low));
SEP_PRINT_DEBUG("saved_ih is 0x%llx\n", CPU_STATE_saved_ih(pcpu));
SYS_Local_Irq_Restore(eflags);
return;
}
/*!
* @fn void cpumon_Save_Cpu(param)
*
* @param param unused parameter
*
* @return None No return needed
*
* @brief Save the old handler for restoration when done
*
*/
static void
cpumon_Save_Cpu (
PVOID parm
)
{
unsigned long eflags;
U64 *idt_base;
CPU_STATE pcpu;
preempt_disable();
pcpu = &pcb[CONTROL_THIS_CPU()];
preempt_enable();
SYS_Local_Irq_Save(eflags);
CPU_STATE_idt_base(pcpu) = idt_base = SYS_Get_IDT_Base();
// save original perf. vector
CPU_STATE_saved_ih(pcpu) = idt_base[CPU_PERF_VECTOR];
SEP_PRINT_DEBUG("saved_ih is 0x%llx\n", CPU_STATE_saved_ih(pcpu));
SYS_Local_Irq_Restore(eflags);
return;
}
/*!
* @fn void cpumon_Destroy_Cpu(param)
*
* @param param unused parameter
*
* @return None No return needed
*
* @brief Restore the old handler
* @brief Finish clean up of the apic
*
*/
static VOID
cpumon_Destroy_Cpu (
PVOID ctx
)
{
unsigned long eflags;
unsigned long long *idt_base;
CPU_STATE pcpu;
preempt_disable();
pcpu = &pcb[CONTROL_THIS_CPU()];
preempt_enable();
SYS_Local_Irq_Save(eflags);
// restore perf. vector (to a safe stub pointer)
idt_base = SYS_Get_IDT_Base();
APIC_Disable_PMI();
idt_base[CPU_PERF_VECTOR] = CPU_STATE_saved_ih(pcpu);
SYS_Local_Irq_Restore(eflags);
return;
}
/*!
* @fn void cpumon_Destroy_Cpu(param)
*
* @param param unused parameter
*
* @return None No return needed
*
* @brief Restore the old handler
* @brief Finish clean up of the apic
*
*/
static VOID
cpumon_Destroy_Cpu (
PVOID ctx
)
{
unsigned long eflags;
unsigned long long *idt_base;
CPU_STATE pcpu;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
unsigned long cr0_value;
#endif
preempt_disable();
pcpu = &pcb[CONTROL_THIS_CPU()];
preempt_enable();
SYS_Local_Irq_Save(eflags);
// restore perf. vector (to a safe stub pointer)
idt_base = SYS_Get_IDT_Base();
APIC_Disable_PMI();
// From 3.10 kernel, the IDT memory has been moved to a read-only location
// which is controlled by the bit 16 in the CR0 register.
// The write protection should be temporarily released to update the IDT.
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
cr0_value = read_cr0();
write_cr0(cr0_value & ~X86_CR0_WP);
#endif
idt_base[CPU_PERF_VECTOR] = CPU_STATE_saved_ih(pcpu);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
write_cr0(cr0_value);
#endif
SYS_Local_Irq_Restore(eflags);
return;
}
