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make scram work on T23 (fix issue #85)

--- a/sys/src/cmd/scram.c

+++ b/sys/src/cmd/scram.c

@@ -1,20 +1,36 @@

 #include <u.h>

 #include </386/include/ureg.h>

-typedef struct Ureg Ureg;

 #include <libc.h>

+struct Ureg u;

+int fd;

+

 void

+apm(void)

+{

+	seek(fd, 0, 0);

+	if(write(fd, &u, sizeof u) < 0)

+		sysfatal("write: %r");

+	seek(fd, 0, 0);

+	if(read(fd, &u, sizeof u) < 0)

+		sysfatal("read: %r");

+	if(u.flags & 1)

+		sysfatal("apm: %lux", (u.ax>>8) & 0xFF);

+}

+

+void

 main()

 {

-	Ureg ureg;

-	int fd;

-	

-	fd = open("/dev/apm", OWRITE);

-	if(fd < 0) sysfatal("%r");

-	memset(&ureg, 0, sizeof ureg);

-	ureg.ax = 0x5307;

-	ureg.bx = 0x0001;

-	ureg.cx = 0x0003;

-	ureg.trap = 0x15;

-	write(fd, &ureg, sizeof ureg);

+	if((fd = open("/dev/apm", ORDWR)) < 0)

+		if((fd = open("#P/apm", ORDWR)) < 0)

+			sysfatal("open: %r");

+

+	u.ax = 0x530E;

+	u.bx = 0x0000;

+	u.cx = 0x0102;

+	apm();

+	u.ax = 0x5307;

+	u.bx = 0x0001;

+	u.cx = 0x0003;

+	apm();

 }