kernel: implement portable userinit() and simplify process creation

replace machine specific userinit() by a portable
implemntation that uses kproc() to create the first
process. the initcode text is mapped using kmap(),
so there is no need for machine specific tmpmap()
functions.

initcode stack preparation should be done in init0()
where the stack is mapped and can be accessed directly.

replacing the machine specific userinit() allows some
big simplifications as sysrfork() and kproc() are now
the only callers of newproc() and we can avoid initializing
fields that we know are being initialized by these
callers.

rename autogenerated init.h and reboot.h headers.
the initcode[] and rebootcode[] blobs are now in *.i
files and hex generation was moved to portmkfile. the
machine specific mkfile only needs to specify how to
build rebootcode.out and initcode.out.

1 files changed, 33 insertions, 30 deletions

diff --git a/sys/src/9/port/sysproc.c b/sys/src/9/port/sysproc.c
index e5aa537d9..56cae1723 100644
--- a/sys/src/9/port/sysproc.c
+++ b/sys/src/9/port/sysproc.c
@@ -80,7 +80,7 @@ sysrfork(va_list list)
 			closeegrp(oeg);
 		}
 		if(flag & RFNOTEG)
-			up->noteid = pidalloc(0);
+			up->noteid = pidalloc(nil);
 		return 0;
 	}
 
@@ -88,20 +88,38 @@ sysrfork(va_list list)
 
 	p->scallnr = up->scallnr;
 	p->s = up->s;
-	p->nerrlab = 0;
 	p->slash = up->slash;
 	p->dot = up->dot;
 	incref(p->dot);
 
 	memmove(p->note, up->note, sizeof(p->note));
-	p->privatemem = up->privatemem;
-	p->noswap = up->noswap;
 	p->nnote = up->nnote;
+	p->notify = up->notify;
 	p->notified = 0;
 	p->lastnote = up->lastnote;
-	p->notify = up->notify;
-	p->ureg = up->ureg;
-	p->dbgreg = 0;
+
+	p->parentpid = up->pid;
+	p->procmode = up->procmode;
+	p->privatemem = up->privatemem;
+	p->noswap = up->noswap;
+	p->hang = up->hang;
+	if(up->procctl == Proc_tracesyscall)
+		p->procctl = Proc_tracesyscall;
+
+	/* Craft a return frame which will cause the child to pop out of
+	 * the scheduler in user mode with the return register zero
+	 */
+	forkchild(p, up->dbgreg);
+
+	kstrdup(&p->text, up->text);
+	kstrdup(&p->user, up->user);
+	kstrdup(&p->args, "");
+
+	p->insyscall = 0;
+	memset(p->time, 0, sizeof(p->time));
+	p->time[TReal] = MACHP(0)->ticks;
+
+	pid = pidalloc(p);
 
 	/* Abort the child process on error */
 	if(waserror()){
@@ -169,36 +187,20 @@ sysrfork(va_list list)
 		p->egrp = up->egrp;
 		incref(p->egrp);
 	}
-	p->hang = up->hang;
-	p->procmode = up->procmode;
-	if(up->procctl == Proc_tracesyscall)
-		p->procctl = Proc_tracesyscall;
 
-	poperror();	/* abortion */
+	if(flag & RFNOTEG)
+		p->noteid = pid;
 
-	/* Craft a return frame which will cause the child to pop out of
-	 * the scheduler in user mode with the return register zero
-	 */
-	forkchild(p, up->dbgreg);
+	procfork(p);
+
+	poperror();	/* abortion */
 
-	p->parentpid = up->pid;
 	if((flag&RFNOWAIT) == 0){
 		p->parent = up;
 		lock(&up->exl);
 		up->nchild++;
 		unlock(&up->exl);
 	}
-	if((flag&RFNOTEG) == 0)
-		p->noteid = up->noteid;
-
-	pid = p->pid;
-	memset(p->time, 0, sizeof(p->time));
-	p->time[TReal] = MACHP(0)->ticks;
-
-	kstrdup(&p->text, up->text);
-	kstrdup(&p->user, up->user);
-
-	procfork(p);
 
 	/*
 	 *  since the bss/data segments are now shareable,
@@ -211,8 +213,9 @@ sysrfork(va_list list)
 	p->fixedpri = up->fixedpri;
 	p->mp = up->mp;
 	wm = up->wired;
-	if(wm)
+	if(wm != nil)
 		procwired(p, wm->machno);
+	p->psstate = nil;
 	ready(p);
 	sched();
 	return pid;
@@ -565,7 +568,7 @@ sysexec(va_list list)
 	up->setargs = 0;
 
 	up->nnote = 0;
-	up->notify = 0;
+	up->notify = nil;
 	up->notified = 0;
 	up->privatemem = 0;
 	up->noswap = 0;