mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-27 20:07:09 +00:00
e9f4275732
When kvm is in hpet_legacy_mode, the hpet is providing the timer interrupt and the pit should not be. So in legacy mode, the pit timer is destroyed, but the *state* of the pit is maintained. So if kvm or the guest tries to modify the state of the pit, this modification is accepted, *except* that the timer isn't actually started. When we exit hpet_legacy_mode, the current state of the pit (which is up to date since we've been accepting modifications) is used to restart the pit timer. The saved_mode code in kvm_pit_load_count temporarily changes mode to 0xff in order to destroy the timer, but then restores the actual value, again maintaining "current" state of the pit for possible later reenablement. [avi: add some reserved storage in the ioctl; make SET_PIT2 IOW] [marcelo: fix memory corruption due to reserved storage] Signed-off-by: Beth Kon <eak@us.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
#ifndef __I8254_H
|
|
#define __I8254_H
|
|
|
|
#include "iodev.h"
|
|
|
|
struct kvm_kpit_channel_state {
|
|
u32 count; /* can be 65536 */
|
|
u16 latched_count;
|
|
u8 count_latched;
|
|
u8 status_latched;
|
|
u8 status;
|
|
u8 read_state;
|
|
u8 write_state;
|
|
u8 write_latch;
|
|
u8 rw_mode;
|
|
u8 mode;
|
|
u8 bcd; /* not supported */
|
|
u8 gate; /* timer start */
|
|
ktime_t count_load_time;
|
|
};
|
|
|
|
struct kvm_kpit_state {
|
|
struct kvm_kpit_channel_state channels[3];
|
|
u32 flags;
|
|
struct kvm_timer pit_timer;
|
|
bool is_periodic;
|
|
u32 speaker_data_on;
|
|
struct mutex lock;
|
|
struct kvm_pit *pit;
|
|
spinlock_t inject_lock;
|
|
unsigned long irq_ack;
|
|
struct kvm_irq_ack_notifier irq_ack_notifier;
|
|
};
|
|
|
|
struct kvm_pit {
|
|
unsigned long base_addresss;
|
|
struct kvm_io_device dev;
|
|
struct kvm_io_device speaker_dev;
|
|
struct kvm *kvm;
|
|
struct kvm_kpit_state pit_state;
|
|
int irq_source_id;
|
|
struct kvm_irq_mask_notifier mask_notifier;
|
|
};
|
|
|
|
#define KVM_PIT_BASE_ADDRESS 0x40
|
|
#define KVM_SPEAKER_BASE_ADDRESS 0x61
|
|
#define KVM_PIT_MEM_LENGTH 4
|
|
#define KVM_PIT_FREQ 1193181
|
|
#define KVM_MAX_PIT_INTR_INTERVAL HZ / 100
|
|
#define KVM_PIT_CHANNEL_MASK 0x3
|
|
|
|
void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu);
|
|
void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
|
|
struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
|
|
void kvm_free_pit(struct kvm *kvm);
|
|
void kvm_pit_reset(struct kvm_pit *pit);
|
|
|
|
#endif
|