From: Alan Cox <alan@linux.intel.com>
Date: Sat, 19 Jan 2019 21:37:59 +0000 (+0000)
Subject: mtx: static tty buffers and set basis for nice wakeups and flow control
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=a5676b4cc59cd89ec3f375eff6fafee0df92f713;p=FUZIX.git

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 109dcd47..7aee4fc5 100644
--- 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);