#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 {
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:
state->pit_counter = state->pit_reload - cpu_cycles;
if (oscillations) {
- PrintDebug("8254 PIT: Handling %d crystal tics\n", 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\n");
- v3_raise_irq(info->vm_info, 0);
- }
+ 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);
+ //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:
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 = (int (*)(void *))pit_free,
+ 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));
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");
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");
