#include <palacios/vmm_io.h>
-#ifndef CONFIG_DEBUG_PIT
+#ifndef V3_CONFIG_DEBUG_PIT
#undef PrintDebug
#define PrintDebug(fmt, args...)
#endif
*/
typedef enum {NOT_RUNNING, PENDING, RUNNING} channel_run_state_t;
typedef enum {NOT_WAITING, WAITING_LOBYTE, WAITING_HIBYTE} channel_access_state_t;
-typedef enum {LATCH_COUNT, LOBYTE_ONLY, HIBYTE_ONLY, LOBYTE_HIBYTE} channel_access_mode_t;
-typedef enum {IRQ_ON_TERM_CNT, ONE_SHOT, RATE_GEN, SQR_WAVE, SW_STROBE, HW_STROBE} channel_op_mode_t;
+typedef enum {LATCH_COUNT = 0, LOBYTE_ONLY = 1, HIBYTE_ONLY = 2, LOBYTE_HIBYTE = 3} channel_access_mode_t;
+typedef enum {IRQ_ON_TERM_CNT = 0, ONE_SHOT = 1, RATE_GEN = 2, SQR_WAVE = 3, SW_STROBE = 4, HW_STROBE = 5} channel_op_mode_t;
struct channel {
struct v3_timer * timer;
+ struct v3_vm_info * vm;
+
struct channel ch_0;
struct channel ch_1;
struct channel ch_2;
* This should call out to handle_SQR_WAVE_tics, etc...
*/
// Returns true if the the output signal changed state
-static int handle_crystal_tics(struct vm_device * dev, struct channel * ch, uint_t oscillations) {
+static int handle_crystal_tics(struct pit * pit, struct channel * ch, uint_t oscillations) {
uint_t channel_cycles = 0;
uint_t output_changed = 0;
- // PrintDebug("8254 PIT: %d crystal tics\n", oscillations);
+ // PrintDebug("8254 PIT (channel %d): %d crystal tics\n",
+ // ch - pit->ch0, oscillations);
if (ch->run_state == PENDING) {
oscillations--;
ch->counter = ch->reload_value;
if (ch->counter > oscillations) {
ch->counter -= oscillations;
+ //PrintDebug("8254 PIT: Counter at %u after %u oscillations.\n",
+ // (unsigned int)ch->counter, oscillations);
return output_changed;
} else {
ushort_t reload_val = ch->reload_value;
- if (ch->op_mode == SW_STROBE) {
+ if ((ch->op_mode == SW_STROBE) || (ch->op_mode == IRQ_ON_TERM_CNT)) {
reload_val = 0xffff;
}
oscillations = oscillations % reload_val;
ch->counter = reload_val - oscillations;
+ // PrintDebug("8254 PIT: Counter reset to %u.\n",
+ // (unsigned int)ch->counter);
+
}
- // PrintDebug("8254 PIT: Channel Cycles: %d\n", channel_cycles);
+ //PrintDebug("8254 PIT: Channel %ld (mode = %u) Cycles: %d\n",
+ //(ch - &pit->ch_0), ch->op_mode, channel_cycles);
-
-
switch (ch->op_mode) {
case IRQ_ON_TERM_CNT:
- if ((channel_cycles > 0) && (ch->output_pin == 0)) {
- ch->output_pin = 1;
- output_changed = 1;
+ if (channel_cycles > 0) {
+ if (ch->output_pin == 0) {
+ ch->output_pin = 1;
+ output_changed = 1;
+ } else {
+ // PrintDebug("8254: Output not changed in TERM_CNT mode.\n");
+ }
}
break;
case ONE_SHOT:
- if ((channel_cycles > 0) && (ch->output_pin == 0)) {
- ch->output_pin = 1;
- output_changed = 1;
+ if (channel_cycles > 0) {
+ if ((ch->output_pin == 0)) {
+ ch->output_pin = 1;
+ output_changed = 1;
+ } else {
+ // PrintDebug("8254: Output not changed in ONE_SHOT mode.\n");
+ }
}
break;
case RATE_GEN:
output_changed = 1;
}
+
break;
case SW_STROBE:
#include <palacios/vm_guest.h>
static void pit_update_timer(struct guest_info * info, ullong_t cpu_cycles, ullong_t cpu_freq, void * private_data) {
- struct vm_device * dev = (struct vm_device *)private_data;
- struct pit * state = (struct pit *)dev->private_data;
+ struct pit * state = (struct pit *)private_data;
// ullong_t tmp_ctr = state->pit_counter;
ullong_t tmp_cycles;
uint_t oscillations = 0;
// update counter with remainder (mod reload)
state->pit_counter = state->pit_reload - cpu_cycles;
- //PrintDebug("8254 PIT: Handling %d crystal tics\n", oscillations);
- if (handle_crystal_tics(dev, &(state->ch_0), oscillations) == 1) {
- // raise interrupt
- PrintDebug("8254 PIT: Injecting Timer interrupt to guest\n");
- v3_raise_irq(info->vm_info, 0);
- }
-
- //handle_crystal_tics(dev, &(state->ch_1), oscillations);
- handle_crystal_tics(dev, &(state->ch_2), oscillations);
- }
-
+ if (oscillations) {
+ // PrintDebug("8254 PIT: Handling %d crystal tics\n", oscillations);
+ if (handle_crystal_tics(state, &(state->ch_0), oscillations) == 1) {
+ // raise interrupt
+ PrintDebug("8254 PIT: Injecting Timer interrupt to guest (run_state = %d)\n",
+ state->ch_0.run_state);
+ v3_raise_irq(info->vm_info, 0);
+ }
+ //handle_crystal_tics(state, &(state->ch_1), oscillations);
+ handle_crystal_tics(state, &(state->ch_2), oscillations);
+ }
+ }
return;
}
}
static int handle_channel_cmd(struct channel * ch, struct pit_cmd_word cmd) {
- ch->op_mode = cmd.op_mode;
- ch->access_mode = cmd.access_mode;
+ if (cmd.op_mode != ch->op_mode) {
+ PrintDebug("8254 PIT: Changing channel from op mode %d to op mode %d.\n",
+ ch->op_mode, cmd.op_mode);
+ }
+ if (cmd.access_mode != 0) {
+ ch->op_mode = cmd.op_mode;
+ }
+ if (cmd.access_mode != ch->access_mode) {
+ PrintDebug("8254 PIT: Changing channel from access mode %d to access mode %d.\n",
+ ch->access_mode, cmd.access_mode);
+ }
+ ch->access_mode = cmd.access_mode;
switch (cmd.access_mode) {
case LATCH_COUNT:
-static int pit_free(struct vm_device * dev) {
- struct pit * state = (struct pit *)dev->private_data;
- struct guest_info * info = &(dev->vm->cores[0]);
+static int pit_free(void * private_data) {
+ struct pit * state = (struct pit *)private_data;
+ struct guest_info * info = &(state->vm->cores[0]);
if (state->timer) {
return 0;
}
+#ifdef V3_CONFIG_CHECKPOINT
+static int pit_save(struct v3_chkpt_ctx * ctx, void * private_data) {
+ struct pit * pit_state = (struct pit *)private_data;
-static struct v3_device_ops dev_ops = {
- .free = pit_free,
- .reset = NULL,
- .start = NULL,
- .stop = NULL,
+ V3_CHKPT_STD_SAVE(ctx, pit_state->pit_counter);
+ V3_CHKPT_STD_SAVE(ctx, pit_state->pit_reload);
+ V3_CHKPT_STD_SAVE(ctx, pit_state->ch_0);
+ V3_CHKPT_STD_SAVE(ctx, pit_state->ch_1);
+ V3_CHKPT_STD_SAVE(ctx, pit_state->ch_2);
+ V3_CHKPT_STD_SAVE(ctx, pit_state->speaker);
+
+ return 0;
+}
+static int pit_load(struct v3_chkpt_ctx * ctx, void * private_data) {
+ struct pit * pit_state = (struct pit *)private_data;
+
+ V3_CHKPT_STD_LOAD(ctx, pit_state->pit_counter);
+ V3_CHKPT_STD_LOAD(ctx, pit_state->pit_reload);
+ V3_CHKPT_STD_LOAD(ctx, pit_state->ch_0);
+ V3_CHKPT_STD_LOAD(ctx, pit_state->ch_1);
+ V3_CHKPT_STD_LOAD(ctx, pit_state->ch_2);
+ V3_CHKPT_STD_LOAD(ctx, pit_state->speaker);
+
+ return 0;
+}
+#endif
+
+static struct v3_device_ops dev_ops = {
+ .free = (int (*)(void *))pit_free,
+#ifdef V3_CONFIG_CHECKPOINT
+ .save = pit_save,
+ .load = pit_load,
+#endif
};
#include <palacios/vm_guest.h>
// just hardcode the core context
struct guest_info * info = &(vm->cores[0]);
- uint_t cpu_khz = V3_CPU_KHZ();
+ uint_t cpu_khz = info->time_state.guest_cpu_freq;
ullong_t reload_val = (ullong_t)cpu_khz * 1000;
pit_state = (struct pit *)V3_Malloc(sizeof(struct pit));
+
V3_ASSERT(pit_state != NULL);
pit_state->speaker = 0;
+ pit_state->vm = vm;
- dev = v3_allocate_device(dev_id, &dev_ops, pit_state);
+ dev = v3_add_device(vm, dev_id, &dev_ops, pit_state);
- if (v3_attach_device(vm, dev) == -1) {
+ if (dev == NULL) {
PrintError("Could not attach device %s\n", dev_id);
V3_Free(pit_state);
return -1;
if (ret != 0) {
PrintError("8254 PIT: Failed to hook IO ports\n");
- v3_detach_device(dev);
+ v3_remove_device(dev);
return -1;
}
-#ifdef CONFIG_DEBUG_PIT
+#ifdef V3_CONFIG_DEBUG_PIT
PrintDebug("8254 PIT: OSC_HZ=%d, reload_val=", OSC_HZ);
//PrintTrace(reload_val);
PrintDebug("\n");
- pit_state->timer = v3_add_timer(info, &timer_ops, dev);
+ pit_state->timer = v3_add_timer(info, &timer_ops, pit_state);
if (pit_state->timer == NULL) {
- v3_detach_device(dev);
+ v3_remove_device(dev);
return -1;
}
init_channel(&(pit_state->ch_1));
init_channel(&(pit_state->ch_2));
-#ifdef CONFIG_DEBUG_PIT
+#ifdef V3_CONFIG_DEBUG_PIT
PrintDebug("8254 PIT: CPU MHZ=%d -- pit count=", cpu_khz / 1000);
//PrintTraceLL(pit_state->pit_counter);
PrintDebug("\n");
