From 51f2d9ca33976fa7f3d06790306bc654b3b6a0df Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 31 Oct 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-10-31

---
 bitsy/devflash.c       | 17 +++++++++++++
 "bitsy/dev\302\265c.c" | 26 ++++++++++++++++----
 bitsy/trap.c           | 54 +++++++++++++++++++++++++++++++++++-------
 3 files changed, 85 insertions(+), 12 deletions(-)
 create mode 100644 bitsy/devflash.c

diff --git a/bitsy/devflash.c b/bitsy/devflash.c
new file mode 100644
index 0000000000000000000000000000000000000000..0e915c4c2360d8739c798a36f3573c9c4791e34e
--- /dev/null
+++ b/bitsy/devflash.c
@@ -0,0 +1,17 @@
+#include	"u.h"
+#include	"../port/lib.h"
+#include	"mem.h"
+#include	"dat.h"
+#include	"fns.h"
+#include	"io.h"
+#include	"../port/error.h"
+
+/* flash partitions */
+typedef struct FlashPart FlashPart;
+struct FlashPart
+{
+	QLock;
+	char	name[NAMELEN];
+	ulong	start;		/* byte offsets */
+	ulong	end;
+};
diff --git "a/bitsy/dev\302\265c.c" "b/bitsy/dev\302\265c.c"
index 5a010a60760c55b9e9f645b5bc52b05d8349d2aa..b2a61260b69db191e7c20e2aca8411717e27b9d5 100644
--- "a/bitsy/dev\302\265c.c"
+++ "b/bitsy/dev\302\265c.c"
@@ -10,6 +10,7 @@ enum{
 	Qbacklight = 1,
 	Qbattery,
 	Qbuttons,
+	Qkbdin,
 	Qled,
 	Qversion,
 
@@ -34,6 +35,7 @@ Dirtab µcdir[]={
 	"backlight",	{ Qbacklight, 0 },	0,	0664,
 	"battery",	{ Qbattery, 0 },	0,	0664,
 	"buttons",	{ Qbuttons, 0 },	0,	0664,
+	"kbdin",	{ Qkbdin, 0 },		0,	0664,
 	"led",		{ Qled, 0 },		0,	0664,
 	"version",	{ Qversion, 0 },	0,	0664,
 };
@@ -71,6 +73,7 @@ int
 	int i, len, b, up;
 	uchar cksum;
 	uchar *p;
+	static int samseq;
 
 	if(ctlr.n > sizeof(ctlr.buf))
 		panic("µcputc");
@@ -130,10 +133,13 @@ int
 			}
 			break;
 		case BLtouch:
-			if(len == 4)
-				pentrackxy((p[0]<<8)|p[1], (p[2]<<8)|p[3]);
-			else
+			if(len == 4) {
+				if (samseq++ > 10)
+					pentrackxy((p[0]<<8)|p[1], (p[2]<<8)|p[3]);
+			} else {
+				samseq = 0;
 				pentrackxy(-1, -1);
+			}
 			break;
 		case BLled:
 			wakeup(&ctlr.r);
@@ -302,7 +308,9 @@ static long
 {
 	Cmdbuf *cmd;
 	uchar data[16];
-	int i;
+	char str[64];
+	int i, j;
+	Rune r;
 
 	if(off != 0)
 		error(Ebadarg);
@@ -314,6 +322,16 @@ static long
 		data[i] = atoi(cmd->f[i]);
 
 	switch(c->qid.path){
+	case Qkbdin:
+		if(n >= sizeof(str))
+			n = sizeof(str)-1;
+		memmove(str, a, n);
+		str[n] = 0;
+		for(i = 0; i < n; i += j){
+          		j = chartorune(&r, &str[i]);
+			kbdputc(nil, r);
+		}
+		break;
 	case Qled:
 		sendmsgwithack(BLled, data, cmd->nf);
 		break;
diff --git a/bitsy/trap.c b/bitsy/trap.c
index 4a942c01d7042f9f3801a5898d6a57f24e43619c..0167b9f0f865ef116351fbfb3f0b42775783d9b2 100644
--- a/bitsy/trap.c
+++ b/bitsy/trap.c
@@ -91,7 +91,7 @@ warnregs(Ureg *ur, char *tag)
 	char *p;
 
 	p = seprint(buf, e, "%s:\n", tag);
-	p = seprint(p, e, "type %.8lux psr %.8lux pc %.8lux\n",
+	p = seprint(p, e, "type 0x%.8lux psr 0x%.8lux pc 0x%.8lux\n",
 		ur->type, ur->psr, ur->pc);
 	p = seprint(p, e, "r0  0x%.8lux r1  0x%.8lux r2  0x%.8lux r3  0x%.8lux\n",
 		ur->r0, ur->r1, ur->r2, ur->r3);
@@ -283,10 +283,9 @@ trap(Ureg *ureg)
 	}
 
 out:
-	if(user && (up->procctl || up->nnote)){
-		splhi();
+	splhi();
+	if(user && (up->procctl || up->nnote))
 		notify(ureg);
-	}
 }
 
 /*
@@ -358,10 +357,9 @@ syscall(Ureg* ureg)
 	if(scallnr == NOTED)
 		noted(ureg, *(ulong*)(sp+BY2WD));
 
-	if(scallnr != RFORK && (up->procctl || up->nnote)){
-		splhi();
+	splhi();
+	if(scallnr != RFORK && (up->procctl || up->nnote))
 		notify(ureg);
-	}
 }
 
 /*
@@ -617,11 +615,51 @@ execregs(ulong entry, ulong ssize, ulong nargs)
 }
 
 /*
- *  dump the processor stack for this process
+ * Fill in enough of Ureg to get a stack trace, and call a function.
+ * Used by debugging interface rdb.
  */
+void
+callwithureg(void (*fn)(Ureg*))
+{
+	Ureg ureg;
+	ureg.pc = getcallerpc(&fn);
+	ureg.sp = (ulong)&fn;
+	fn(&ureg);
+}
+
+static void
+_dumpstack(Ureg *ureg)
+{
+	ulong l, v, i;
+	ulong *p;
+	extern ulong etext;
+
+	if(up == 0)
+		return;
+
+	print("ktrace /kernel/path %.8lux %.8lux\n", ureg->pc, ureg->sp);
+	i = 0;
+	for(l=(ulong)&l; l<(ulong)(up->kstack+KSTACK); l+=4){
+		v = *(ulong*)l;
+		if(KTZERO < v && v < (ulong)&etext && (v&3)==0){
+			v -= 4;
+			p = (ulong*)v;
+			if((*p & 0x0f000000) == 0x0b000000)
+				print("%.8lux=%.8lux ", l, v);
+		}
+		if(i == 4){
+			i = 0;
+			print("\n");
+		}
+	}
+	if(i)
+		print("\n");
+}
+
 void
 dumpstack(void)
 {
+	callwithureg(_dumpstack);
 }
 
 /*