kernel: do all fp state fork from procfork() (like pc kernel)

this simplifies the arm ports and keeps all the stuff in one place
instead of spreading it thru notify(), trap() and syscall() functions
and prevents useless fp state copying for kernel procs.

also make sure to save fp in notify while still splhi().

4 files changed, 12 insertions, 27 deletions

diff --git a/sys/src/9/omap/arch.c b/sys/src/9/omap/arch.c
index 4714168b0..0563ca543 100644
--- a/sys/src/9/omap/arch.c
+++ b/sys/src/9/omap/arch.c
@@ -134,6 +134,8 @@ procfork(Proc* p)
 {
 	p->kentry = up->kentry;
 	p->pcycles = -p->kentry;
+
+	fpuprocfork(p);
 }
 
 /*
diff --git a/sys/src/9/omap/fns.h b/sys/src/9/omap/fns.h
index a1e486dda..6735ae2d8 100644
--- a/sys/src/9/omap/fns.h
+++ b/sys/src/9/omap/fns.h
@@ -114,8 +114,7 @@ extern void fpunotify(Ureg*);
 extern void fpuprocrestore(Proc*);
 extern void fpuprocsave(Proc*);
 extern void fpusysprocsetup(Proc*);
-extern void fpusysrfork(Ureg*);
-extern void fpusysrforkchild(Proc*, Ureg*, Proc*);
+extern void fpuprocfork(Proc*);
 extern int fpuemu(Ureg*);
 
 /*
diff --git a/sys/src/9/omap/softfpu.c b/sys/src/9/omap/softfpu.c
index 7f01446c0..817b502db 100644
--- a/sys/src/9/omap/softfpu.c
+++ b/sys/src/9/omap/softfpu.c
@@ -42,27 +42,6 @@ fpunoted(void)
 }
 
 void
-fpusysrfork(Ureg*)
-{
-	/*
-	 * Called early in the non-interruptible path of
-	 * sysrfork() via the machine-dependent syscall() routine.
-	 * Save the state so that it can be easily copied
-	 * to the child process later.
-	 */
-}
-
-void
-fpusysrforkchild(Proc*, Ureg *, Proc*)
-{
-	/*
-	 * Called later in sysrfork() via the machine-dependent
-	 * sysrforkchild() routine.
-	 * Copy the parent FPU state to the child.
-	 */
-}
-
-void
 fpuprocsave(Proc*)
 {
 	/*
@@ -86,6 +65,15 @@ fpuprocrestore(Proc*)
 }
 
 void
+fpuprocfork(Proc*)
+{
+	/*
+	 * The current process has been forked, save and copy neccesary
+	 * state to child. Nothing to do here, child proc starts with FPinit.
+	 */
+}
+
+void
 fpusysprocsetup(Proc*)
 {
 	/*
diff --git a/sys/src/9/omap/syscall.c b/sys/src/9/omap/syscall.c
index f9f390e2b..e40a82174 100644
--- a/sys/src/9/omap/syscall.c
+++ b/sys/src/9/omap/syscall.c
@@ -205,8 +205,6 @@ syscall(Ureg* ureg)
 
 	scallnr = ureg->r0;
 	up->scallnr = scallnr;
-	if(scallnr == RFORK)
-		fpusysrfork(ureg);
 	spllo();
 
 	sp = ureg->sp;
@@ -328,6 +326,4 @@ forkchild(Proc *p, Ureg *ureg)
 	/* Things from bottom of syscall which were never executed */
 	p->psstate = 0;
 	p->insyscall = 0;
-
-	fpusysrforkchild(p, cureg, up);
 }