mtx: static tty buffers and set basis for nice wakeups and flow control

diff --git a/Kernel/platform-mtx/devtty.c b/Kernel/platform-mtx/devtty.c
index 109dcd4..7aee4fc 100644 (file)
--- a/Kernel/platform-mtx/devtty.c
+++ b/Kernel/platform-mtx/devtty.c
@@ -29,10 +29,12 @@ uint8_t vtattr_cap;
 struct vt_repeat keyrepeat;
 static uint8_t kbd_timer;
 
-char tbuf1[TTYSIZ];
-char tbuf2[TTYSIZ];
-char tbuf3[TTYSIZ];
-char tbuf4[TTYSIZ];
+static char tbuf1[TTYSIZ];
+static char tbuf2[TTYSIZ];
+static char tbuf3[TTYSIZ];
+static char tbuf4[TTYSIZ];
+
+static uint8_t sleeping;
 
 struct s_queue ttyinq[NUM_DEV_TTY + 1] = {     /* ttyinq[0] is never used */
        {NULL, NULL, NULL, 0, 0, 0},
@@ -125,7 +127,7 @@ int tty_carrier(uint8_t minor)
 
 void tty_sleeping(uint8_t minor)
 {
-       used(minor);
+       sleeping |= (1 << minor);
 }
 
 void tty_data_consumed(uint8_t minor)
@@ -351,6 +353,10 @@ void tty_interrupt(void)
                        tty_inproc(3, r);
                        r = serialAc;
                }
+               if ((sleeping & 8) && (r & 0x04)) {
+                       sleeping &= ~8;
+                       tty_outproc(3);
+               }
                if (!(r & 0x08))
                        tty_carrier_drop(3);
                r = serialBc;
@@ -359,6 +365,10 @@ void tty_interrupt(void)
                        tty_inproc(4, r);
                        r = serialBc;
                }
+               if ((sleeping & 16) && (r & 0x04)) {
+                       sleeping &= ~16;
+                       tty_outproc(4);
+               }
                serialAc = 0x07 << 3;   /* Return from interrupt */
                if (!(r & 0x08))
                        tty_carrier_drop(4);