1 files changed, 112 insertions, 0 deletions
diff --git a/os/port/rdb.c b/os/port/rdb.c
new file mode 100644
index 00000000..7386bcc6
--- /dev/null
+++ b/os/port/rdb.c
@@ -0,0 +1,112 @@
+#include "u.h"
+#include "../port/lib.h"
+#include "mem.h"
+#include "dat.h"
+#include "fns.h"
+#include "io.h"
+#include "ureg.h"
+
+/*
+ * alternative debug protocol for plan 9's rdbfs(4) for plan 9's own acid
+ */
+#define DBG	if(0)scrprint
+#pragma varargck argpos scrprint 1
+static Ureg ureg;
+extern Queue *klogq;
+
+static void
+scrprint(char *fmt, ...)
+{
+	char buf[128];
+	va_list va;
+	int n;
+
+	va_start(va, fmt);
+	n = vseprint(buf, buf+sizeof buf, fmt, va)-buf;
+	va_end(va);
+	putstrn(buf, n);
+}
+
+static char*
+getline(void)
+{
+	static char buf[128];
+	int i, c;
+
+	for(;;){
+		for(i=0; i<nelem(buf) && (c=uartgetc()) != '\n'; i++){
+			DBG("%c...", c);
+			buf[i] = c;
+		}
+
+		if(i < nelem(buf)){
+			buf[i] = 0;
+			return buf;
+		}
+	}
+}
+
+static void*
+addr(char *s, Ureg *ureg, char **p)
+{
+	ulong a;
+
+	a = strtoul(s, p, 16);
+	if(a < sizeof(Ureg))
+		return ((uchar*)ureg)+a;
+	return (void*)a;
+}
+
+static void
+talkrdb(Ureg *ureg)
+{
+	uchar *a;
+	char *p;
+	char *req;
+
+	printq = nil;	// turn off serial console
+	klogq = nil;	// turn off /dev/kprint if active
+	iprint("Edebugger reset\n");
+	for(;;){
+		req = getline();
+		switch(*req){
+		case 'r':
+			a = addr(req+1, ureg, nil);
+			DBG("read %p\n", a);
+			iprint("R%.8lux %.2ux %.2ux %.2ux %.2ux\n", strtoul(req+1, 0, 16), a[0], a[1], a[2], a[3]);
+			break;
+
+		case 'w':
+			a = addr(req+1, ureg, &p);
+			*(ulong*)a = strtoul(p, nil, 16);
+			iprint("W\n");
+			break;
+/*
+ *		case Tmput:
+			n = min[4];
+			if(n > 4){
+				mesg(Rerr, Ecount);
+				break;
+			}
+			a = addr(min+0);
+			scrprint("mput %.8lux\n", a);
+			memmove(a, min+5, n);
+			mesg(Rmput, mout);
+			break;
+ *
+ */
+		default:
+			DBG("unknown %c\n", *req);
+			iprint("Eunknown message\n");
+			break;
+		}
+	}
+}
+
+void
+rdb(void)
+{
+	splhi();
+	iprint("rdb...");
+	callwithureg(talkrdb);
+}