Merge branch 'scale-amd64' of git+ssh://amsterdam.csail.mit.edu/home/am0/6.828/xv6 into scale-amd64

c73483e4 · Silas Boyd-Wickizer · 28ead2d3 · a40317e9 · c73483e4 · c73483e4
--- a/kernel/kernel.ld
+++ b/kernel/kernel.ld
@@ -18,6 +18,14 @@ SECTIONS
 		*(.prof)
 	}
 	PROVIDE(eprof = .);
+
+	PROVIDE(sctors = .);
+	.ctors : {
+		KEEP(*(SORT(.ctors.*)));
+		KEEP(*(.ctors));
+	}
+	PROVIDE(ectors = .);
+
 	. = ALIGN(0x1000);
 	.data : {
 		*(.data .data.* .gnu.linkonce.d.*)

--- a/kernel/main.cc
+++ b/kernel/main.cc
@@ -36,7 +36,6 @@ void initnet(void);
 void initsched(void);
 void initlockstat(void);
 void initwq(void);
-void initsperf(void);
 void initidle(void);
 void initcpprt(void);
 void initfutex(void);
@@ -133,6 +132,11 @@ cmain(u64 mbmagic, u64 mbaddr)
 {
  extern u64 cpuhz;

+  // Call global constructors
+  extern const uptr sctors[], ectors[];
+  for (const uptr *ctorva = ectors; ctorva > sctors; )
+    ((void(*)()) *--ctorva)();
+
  initpg();
  inithz();        // CPU Hz, microdelay
  initpic();       // interrupt controller
@@ -144,7 +148,6 @@ cmain(u64 mbmagic, u64 mbaddr)
  initacpi();

  initseg();
-  initsperf();
  inittrap();
  initlapic();
  initcmdline();

--- a/kernel/sperf.cc
+++ b/kernel/sperf.cc
@@ -9,11 +9,3 @@ using namespace scopedperf;

 static tsc_ctr tsc;
 ctrgroup_chain<tsc_ctr> perfgroup(&tsc);
-// but xv6 doesn't run static constructors, so call them explicitly below..
-
-void
-initsperf()
-{
-  new (&tsc) tsc_ctr();
-  new (&perfgroup) ctrgroup_chain<tsc_ctr>(&tsc);
-}