X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fdevices%2F8254.c;fp=palacios%2Fsrc%2Fdevices%2F8254.c;h=b11fb7e3637f484a9f55ee6f971a3b852e8607ef;hb=d8fc6aa4bc2a5d9cec50923e9d2bd30f867dd50a;hp=0000000000000000000000000000000000000000;hpb=639fdba00d36b2a60fad3d28703459354cf8744f;p=palacios.git

diff --git a/palacios/src/devices/8254.c b/palacios/src/devices/8254.c
new file mode 100644
index 0000000..b11fb7e
--- /dev/null
+++ b/palacios/src/devices/8254.c
@@ -0,0 +1,150 @@
+#include <devices/8254.h>
+#include <palacios/vmm.h>
+#include <palacios/vmm_time.h>
+
+// constants
+#define OSC_HZ 1193182
+
+
+/* The 8254 has three counters and one control port */
+#define CHANNEL0_PORT 0x40
+#define CHANNEL1_PORT 0x41
+#define CHANNEL2_PORT 0x42
+#define COMMAND_PORT 0x43
+
+
+#define PIT_INTR_NUM 0
+
+/* The order of these typedefs is important because the numerical values correspond to the 
+ * values coming from the io ports
+ */
+typedef enum {NOT_RUNNING, WAITING_LOBYTE, WAITING_HIBYTE, RUNNING} 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;
+
+
+struct channel {
+  channel_access_mode_t access_mode;
+  channel_access_state_t access_state;
+
+  channel_op_mode_t op_mode;
+
+  // Time til interrupt trigger 
+  ullong_t ns;
+
+  uint_t ctr;
+  uint_t prg_ctr;
+};
+
+
+struct pit {
+
+  struct channel ch_0;
+  struct channel ch_1;
+  struct channel ch_2;
+};
+
+struct pit_cmd {
+  uint_t channel     : 2;
+  uint_t access_mode : 2;
+  uint_t op_mode     : 3;
+  uint_t bcd_mode    : 1;
+};
+
+
+
+
+
+
+static void pit_update_time(ullong_t cpu_cycles, ullong_t cpu_freq, void * private_data) {
+
+  return;
+}
+
+
+
+static int pit_read_channel(ushort_t port, void * dst, uint_t length, struct vm_device * dev) {
+  PrintDebug("8254 PIT: Read of PIT Channel %d\n", port - CHANNEL0_PORT);
+  return length;
+}
+
+
+
+static int pit_write_channel(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
+  PrintDebug("8254 PIT: Write to PIT Channel %d\n", port - CHANNEL0_PORT);
+  return length;
+}
+
+
+static int pit_write_command(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
+  struct pit * state = (struct pit *)dev->private_data;
+  struct pit_cmd * cmd = (struct pit_cmd *)src;
+
+  PrintDebug("8254 PIT: Write to PIT Command port\n");
+
+  if (length != 1) {
+    PrintDebug("8254 PIT: Write of Invalid length to command port\n");
+    return -1;
+  }
+
+  switch (cmd->channel) {
+  case 0:
+    state->ch_0.op_mode = cmd->op_mode;
+    break;
+  case 1:
+    break;
+  case 2:
+    break;
+  default:
+    break;
+  }
+
+
+  return length;
+}
+
+
+
+
+static struct vm_timer_ops timer_ops = {
+  .update_time = pit_update_time,
+};
+
+
+static int pit_init(struct vm_device * dev) {
+  dev_hook_io(dev, CHANNEL0_PORT, &pit_read_channel, &pit_write_channel);
+  dev_hook_io(dev, CHANNEL1_PORT, &pit_read_channel, &pit_write_channel);
+  dev_hook_io(dev, CHANNEL2_PORT, &pit_read_channel, &pit_write_channel);
+  dev_hook_io(dev, COMMAND_PORT, NULL, &pit_write_command);
+
+
+  v3_add_timer(dev->vm, &timer_ops, dev);
+
+  return 0;
+}
+
+static int pit_deinit(struct vm_device * dev) {
+
+  return 0;
+}
+
+
+static struct vm_device_ops dev_ops = {
+  .init = pit_init,
+  .deinit = pit_deinit,
+  .reset = NULL,
+  .start = NULL,
+  .stop = NULL,
+
+};
+
+
+struct vm_device * create_pit() {
+  struct pit * pit_state = NULL;
+  pit_state = (struct pit *)V3_Malloc(sizeof(struct pit));
+  V3_ASSERT(pit_state != NULL);
+
+  struct vm_device * dev = create_device("PIT", &dev_ops, pit_state);
+  
+  return dev;
+}