Removed the sys_puts system call in favour of calls to tty_write().

Removed the rsputs() function in favour of calls to tty_write().

Corrected a bug in the serial driver and TTY subsystem where a full
buffer wouldn't be detected. This was caused by a missing set of
brackets on several operations involving the modulus operator.

Added the ability for the serial driver to automatically take data from
the TTY device's write buffer and push it to the serial port. This can
happen in one of two ways; 1) the TTY subsystem notifies the serial
driver of new data by calling the write() function pointer in the
tty_struct or, 2) the serial port issues an interrupt signalling that it
has finished sending data prompting the driver to check the buffers for
any more pending data.

3 files changed, 25 insertions, 28 deletions

diff --git a/include/kernel/serial.h b/include/kernel/serial.h
index 6ac5d65..beb0891 100644
--- a/include/kernel/serial.h
+++ b/include/kernel/serial.h
@@ -6,8 +6,6 @@
 
 extern struct tty_struct tty_rs;
 
-int rsputs(char*);
-
 ssize_t rsread(void*, size_t);
 
 void serial_init(void);
diff --git a/include/kernel/sys.h b/include/kernel/sys.h
index e5275cf..1b8be8e 100644
--- a/include/kernel/sys.h
+++ b/include/kernel/sys.h
@@ -1,6 +1,6 @@
 typedef int (*syscall_t) (void);
 
-extern int sys_puts(void);
+extern int sys_time(void);
 extern int sys_time(void);
 extern int sys_getpid(void);
 extern int sys_getpdir(void);
@@ -11,22 +11,22 @@ extern int sys_ctty(void);
 extern int sys_read(void);
 extern int sys_write(void);
 extern int sys_kill(void);
-extern int sys_dummy(void);
 extern int sys_panic(void);
+extern int sys_dummy(void);
 
 syscall_t call_table[256] = {
-  [0] = &sys_puts,
-  [1] = &sys_time,
-  [2] = &sys_getpid,
-  [3] = &sys_getpdir,
-  [4] = &sys_signal,
-  [5] = &sys_alarm,
-  [6] = &sys_pause,
-  [7] = &sys_ctty,
-  [8] = &sys_read,
-  [9] = &sys_write,
-  [10] = &sys_kill,
-  [11] = &sys_panic,
+  [0] = &sys_time,
+  [1] = &sys_getpid,
+  [2] = &sys_getpdir,
+  [3] = &sys_signal,
+  [4] = &sys_alarm,
+  [5] = &sys_pause,
+  [6] = &sys_ctty,
+  [7] = &sys_read,
+  [8] = &sys_write,
+  [9] = &sys_kill,
+  [10] = &sys_panic,
+  [11] = &sys_dummy,
   [12] = &sys_dummy,
   [13] = &sys_dummy,
   [14] = &sys_dummy,
diff --git a/include/unistd.h b/include/unistd.h
index a7e4f32..cc0f766 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -10,18 +10,17 @@ typedef int32_t ssize_t;
 
 typedef int16_t pid_t;
 
-#define __SYS_puts      0
-#define __SYS_time      1
-#define __SYS_getpid    2
-#define __SYS_getpdir   3
-#define __SYS_signal    4
-#define __SYS_alarm     5
-#define __SYS_pause     6
-#define __SYS_ctty      7
-#define __SYS_read      8
-#define __SYS_write     9
-#define __SYS_kill      10
-#define __SYS_panic     11
+#define __SYS_time      0
+#define __SYS_getpid    1
+#define __SYS_getpdir   2
+#define __SYS_signal    3
+#define __SYS_alarm     4
+#define __SYS_pause     5
+#define __SYS_ctty      6
+#define __SYS_read      7
+#define __SYS_write     8
+#define __SYS_kill      9
+#define __SYS_panic     10
 
 #define _syscall0(type, name) \
   type name(void) { \