sys_chan_open & sys_chan_close

Added sys_chan_open and sys_chan_close system calls. More documentation.

src/include/syscalls.h

@@ -44,7 +44,10 @@
 #define KFN_CHAN_STATUS         0x17    /* Get the status of a channel */
 #define KFN_CHAN_IOCTRL         0x18    /* Send a command to a channel (channel dependent functionality) */
 #define KFN_CHAN_REGISTER       0x19    /* Register a channel device driver */
-#define KFN_TEXT_SETSIZES       0x1A    /* Adjusts the screen size based on the current graphics mode */
+#define KFN_CHAN_OPEN           0x1A    /* Open a channel device */
+#define KFN_CHAN_CLOSE          0x1B    /* Close an open channel (not for files) */
+#define KFN_TEXT_SETSIZES       0x1C    /* Adjusts the screen size based on the current graphics mode */
+
 
 /* Block device system calls */
 
@@ -283,6 +286,30 @@ extern short sys_chan_seek(short channel, long position, short base);
  */
 extern short sys_chan_ioctrl(short channel, short command, uint8_t * buffer, short size);
 
+/*
+ * Open a channel
+ *
+ * Inputs:
+ * dev = the device number to have a channel opened
+ * path = a "path" describing how the device is to be open
+ * mode = is the device to be read, written, both? (0x01 = READ flag, 0x02 = WRITE flag, 0x03 = READ and WRITE)
+ *
+ * Returns:
+ * the number of the channel opened, negative number on error
+ */
+extern short sys_chan_open(short dev, uint8_t * path, short mode);
+
+/*
+ * Close a channel
+ *
+ * Inputs:
+ * chan = the number of the channel to close
+ *
+ * Returns:
+ * nothing useful
+ */
+extern short sys_chan_close(short chan);
+
 /***
  *** Block device system calls
  ***/

src/m68k/bios_m68k.c

@@ -95,6 +95,12 @@ unsigned long syscall_dispatch(int32_t function, int32_t param0, int32_t param1,
                 case KFN_CHAN_IOCTRL:
                     return chan_ioctrl((short)param0, (short)param1, (unsigned char *)param2, (short)param3);
 
+                case KFN_CHAN_OPEN:
+                    return chan_open((short)param0, (const char *)param1, (short)param2);
+
+                case KFN_CHAN_CLOSE:
+                    return chan_close((short)param0);
+
                 case KFN_CHAN_REGISTER:
                     return cdev_register((p_dev_chan)param0);
 

src/syscalls.c

@@ -226,6 +226,34 @@ short sys_chan_ioctrl(short channel, short command, uint8_t * buffer, short size
     return syscall(KFN_CHAN_IOCTRL, channel, command, buffer, size);
 }
 
+/*
+ * Open a channel
+ *
+ * Inputs:
+ * dev = the device number to have a channel opened
+ * path = a "path" describing how the device is to be open
+ * mode = is the device to be read, written, both? (0x01 = READ flag, 0x02 = WRITE flag, 0x03 = READ and WRITE)
+ *
+ * Returns:
+ * the number of the channel opened, negative number on error
+ */
+short sys_chan_open(short dev, uint8_t * path, short mode) {
+    return syscall(KFN_CHAN_OPEN, path, mode);
+}
+
+/*
+ * Close a channel
+ *
+ * Inputs:
+ * chan = the number of the channel to close
+ *
+ * Returns:
+ * nothing useful
+ */
+short sys_chan_close(short chan) {
+    return syscall(KFN_CHAN_CLOSE, chan);
+}
+
 /***
  *** Block device system calls
  ***/