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vi: implement _nsec syscall

--- a/sys/src/cmd/vi/syscall.c

+++ b/sys/src/cmd/vi/syscall.c

@@ -65,6 +65,7 @@

 	[AWAIT]		"Await",

 	[PREAD]		"Pread",

 	[PWRITE]	"Pwrite",

+	[_NSEC]		"_nsec",

 };

 void sys1(void) { Bprint(bioout, "No system call %s\n", sysctab[reg.r[REGRET]]); exits(0); }

@@ -638,6 +639,22 @@

 	reg.r[REGRET] = 0;

 }

+void

+sys_nsec(void)

+{

+	ulong ta;

+	vlong t;

+

+	ta = getmem_w(reg.r[REGSP]+4);

+	if(sysdbg)

+		itrace("_nsec(%lux)", ta);

+

+	t = nsec();

+

+	putmem_w(ta, t >> 32);

+	putmem_w(ta+4, t);

+}

+

 void sysfversion(void) { Bprint(bioout, "No system call %s\n", sysctab[reg.r[REGRET]]); exits(0); }

 void sysfsession(void) { Bprint(bioout, "No system call %s\n", sysctab[reg.r[REGRET]]); exits(0); }

 void sysfauth(void) { Bprint(bioout, "No system call %s\n", sysctab[reg.r[REGRET]]); exits(0); }

@@ -710,6 +727,7 @@

 	[AWAIT]		sysawait,

 	[PREAD]		syspread,

 	[PWRITE]	syspwrite,

+	[_NSEC]		sys_nsec,

 };

 void

@@ -719,7 +737,7 @@

 	USED(inst);

 	call = reg.r[REGRET];

-	if(call < 0 || call > PWRITE || systab[call] == nil) {

+	if(call < 0 || call > _NSEC || systab[call] == nil) {

 		Bprint(bioout, "Bad system call\n");

 		dumpreg();

 	}