From: Ben Gras <ben@minix3.org>
Date: Fri, 19 Dec 2008 13:21:42 +0000 (+0000)
Subject: if serial output is enabled in the boot monitor, on the first serial line,
X-Git-Tag: v3.1.4~162
X-Git-Url: http://zhaoyanbai.com/repos/?a=commitdiff_plain;h=b740ff055f7fca6d675f0533f38d7c4f8b423f3f;p=minix.git

if serial output is enabled in the boot monitor, on the first serial line,
enable serial debug output in the kernel too.
---

diff --git a/boot/boot.c b/boot/boot.c
index bd0b7754e..70fe45254 100755
--- a/boot/boot.c
+++ b/boot/boot.c
@@ -48,6 +48,8 @@ char version[]=		"2.20";
 #define arraylimit(a)		((a) + arraysize(a))
 #define between(a, c, z)	((unsigned) ((c) - (a)) <= ((z) - (a)))
 
+int serial_line = -1;
+
 u16_t vid_port;		/* Video i/o port. */
 u32_t vid_mem_base;	/* Video memory base address. */
 u32_t vid_mem_size;	/* Video memory size. */
@@ -1389,13 +1391,14 @@ void boot_device(char *devname)
 void ctty(char *line)
 {
 	if (line == nil) {
-		serial_init(-1);
-	} else
-	if (between('0', line[0], '3') && line[1] == 0) {
-		serial_init(line[0] - '0');
+		serial_line = -1;
+	} else if (between('0', line[0], '3') && line[1] == 0) {
+		serial_line = line[0] - '0';
 	} else {
 		printf("Bad serial line number: %s\n", line);
+		return;
 	}
+	serial_init(serial_line);
 }
 
 #else /* DOS */
diff --git a/boot/bootimage.c b/boot/bootimage.c
index 66354c173..dcec1200d 100755
--- a/boot/bootimage.c
+++ b/boot/bootimage.c
@@ -29,6 +29,7 @@
 
 static int block_size = 0;
 
+extern int serial_line;
 extern u16_t vid_port;         /* Video i/o port. */
 extern u32_t vid_mem_base;     /* Video memory base address. */
 extern u32_t vid_mem_size;     /* Video memory size. */
@@ -748,6 +749,14 @@ void bootminix(void)
 
 	if ((image= select_image(b_value("image"))) == nil) return;
 
+	if(serial_line >= 0) {
+		char linename[2];
+		linename[0] = serial_line + '0';
+		linename[1] = '\0';
+		b_setvar(E_VAR, SERVARNAME, linename);
+		printf("set %s to %s\n", SERVARNAME, linename);
+	}
+
 	exec_image(image);
 
 	switch (errno) {
@@ -763,6 +772,9 @@ void bootminix(void)
 		/* No error or error already reported. */;
 	}
 	free(image);
+
+	if(serial_line >= 0) 
+		b_unset(SERVARNAME);
 }
 
 /*
diff --git a/include/minix/const.h b/include/minix/const.h
index 93d499958..153a40ca0 100755
--- a/include/minix/const.h
+++ b/include/minix/const.h
@@ -131,6 +131,8 @@
 #define NO_ZONE                ((zone_t) 0)	/* absence of a zone number */
 #define NO_DEV                  ((dev_t) 0)	/* absence of a device numb */
 
+#define SERVARNAME		"cttyline"
+
 /* Bits for the system property flags in boot image processes. */
 #define PREEMPTIBLE     0x02    /* kernel tasks are not preemptible */
 #define BILLABLE        0x04    /* some processes are not billable */
diff --git a/kernel/start.c b/kernel/start.c
index b2cb09a43..6af02814f 100755
--- a/kernel/start.c
+++ b/kernel/start.c
@@ -71,6 +71,9 @@ U16_t parmoff, parmsize;	/* boot parameters offset and length */
 	system_hz = atoi(value);
   if(!value || system_hz < 2 || system_hz > 50000)	/* sanity check */
 	system_hz = DEFAULT_HZ;
+  value = get_value(params_buffer, "cttyline");
+  if(value && atoi(value) == 0)
+	do_serial_debug=1;
 
   /* Return to assembler code to switch to protected mode (if 286), 
    * reload selectors and call main().