added software strobe

diff --git a/palacios/src/devices/8254.c b/palacios/src/devices/8254.c
index 90f860a..1de80e9 100644 (file)
--- a/palacios/src/devices/8254.c
+++ b/palacios/src/devices/8254.c
@@ -154,6 +154,10 @@ static int handle_crystal_tics(struct vm_device * dev, struct channel * ch, uint
     } else {
        ushort_t reload_val = ch->reload_value; 
 
+       if (ch->op_mode == SW_STROBE) {
+           reload_val = 0xffff;
+       }
+
        // TODO: Check this....
        // Is this correct???
        if (reload_val == 0) {
@@ -206,8 +210,13 @@ static int handle_crystal_tics(struct vm_device * dev, struct channel * ch, uint
 
            break;
        case SW_STROBE:
-           PrintError("Software strobe not implemented\n");
-           return -1;
+
+           if (channel_cycles > 0) {
+               if (ch->output_pin == 1) {
+                   ch->output_pin = 0;
+                   output_changed = 1;
+               }
+           }
            break;
        case HW_STROBE:
            PrintError("Hardware strobe not implemented\n");
@@ -357,6 +366,9 @@ static int handle_channel_write(struct channel * ch, char val) {
        case SQR_WAVE:
            ch->output_pin = 1;
            break;
+       case SW_STROBE:
+           ch->output_pin = 1;
+           break;
        default:
            PrintError("Invalid OP_MODE: %d\n", ch->op_mode);
            return -1;
@@ -434,6 +446,9 @@ static int handle_channel_cmd(struct channel * ch, struct pit_cmd_word cmd) {
        case SQR_WAVE:
            ch->output_pin = 1;
            break;
+       case SW_STROBE:
+           ch->output_pin = 1;
+           break;
        default:
            PrintError("Invalid OP_MODE: %d\n", cmd.op_mode);
            return -1;