kern: Add a proc0

- Provides the thread's proc pointer and with that access to creds

Update #4475

2 files changed, 54 insertions, 9 deletions

diff --git a/rtemsbsd/rtems/rtems-kernel-init.c b/rtemsbsd/rtems/rtems-kernel-init.c
index 7112914e..f76e7cd7 100644
--- a/rtemsbsd/rtems/rtems-kernel-init.c
+++ b/rtemsbsd/rtems/rtems-kernel-init.c
@@ -50,6 +50,9 @@
 #include <sys/proc.h>
 #include <sys/stat.h>
 #include <sys/kbio.h>
+#include <sys/resourcevar.h>
+#include <sys/jail.h>
+#include <uuid/uuid.h>
 
 #include <limits.h>
 
@@ -94,6 +97,7 @@ sbintime_t sbt_timethreshold;
 sbintime_t sbt_tickthreshold;
 struct bintime tc_tick_bt;
 sbintime_t tc_tick_sbt;
+int maxproc;
 int tc_precexp;
 
 static SYSCTL_NODE(_kern, OID_AUTO, smp, CTLFLAG_RD|CTLFLAG_CAPRD, NULL,
@@ -107,6 +111,38 @@ SYSCTL_INT(_kern_smp, OID_AUTO, maxid, CTLFLAG_RD|CTLFLAG_CAPRD,
 SYSCTL_INT(_kern_smp, OID_AUTO, maxcpus, CTLFLAG_RD|CTLFLAG_CAPRD,
     &maxid_maxcpus, 0, "Max number of CPUs that the system was compiled for.");
 
+/*
+ * Create a single process. RTEMS is a single address, single process OS.
+ */
+static void
+proc0_init(void* dummy)
+{
+	struct proc *p = &proc0;
+	struct ucred *newcred;
+	struct uidinfo tmpuinfo;
+	uuid_t uuid;
+	uihashinit();
+	/* Create the file descriptor table. */
+	newcred = crget();
+	newcred->cr_uid = 0;
+	newcred->cr_ruid = 0;
+	newcred->cr_ngroups = 1;	/* group 0 */
+	newcred->cr_groups[0] = 0;
+	newcred->cr_rgid = 0;
+	tmpuinfo.ui_uid = 1;
+	curthread->td_ucred = newcred;
+	newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
+	newcred->cr_uidinfo = uifind(0);
+	newcred->cr_ruidinfo = uifind(0);
+	p->p_ucred = newcred;
+	p->p_pid = getpid();
+	p->p_fd = NULL;
+	p->p_fdtol = NULL;
+	uuid_generate(uuid);
+	uuid_unparse(uuid, prison0.pr_hostuuid);
+}
+SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
+
 rtems_status_code
 rtems_bsd_initialize(void)
 {
@@ -135,6 +171,8 @@ rtems_bsd_initialize(void)
 	sbt_tickthreshold = bttosbt(bt_tickthreshold);
 	maxid_maxcpus = (int) rtems_scheduler_get_processor_maximum();
 
+	maxproc = 16;
+
 	mkdir("/etc", S_IRWXU | S_IRWXG | S_IRWXO);
 
 	sc =  rtems_timer_initiate_server(
diff --git a/rtemsbsd/rtems/rtems-kernel-thread.c b/rtemsbsd/rtems/rtems-kernel-thread.c
index 8e3344ef..3e1e44b9 100644
--- a/rtemsbsd/rtems/rtems-kernel-thread.c
+++ b/rtemsbsd/rtems/rtems-kernel-thread.c
@@ -90,15 +90,19 @@ struct thread *
 rtems_bsd_thread_create(Thread_Control *thread, int wait)
 {
 	struct thread *td = malloc(sizeof(*td), M_TEMP, M_ZERO | wait);
-	struct sleepqueue *sq = sleepq_alloc();
 
-	if (td != NULL && sq != NULL) {
-		td->td_thread = thread;
-		td->td_sleepqueue = sq;
-	} else {
-		free(td, M_TEMP);
-		sleepq_free(sq);
-		td = NULL;
+	if (td != NULL) {
+		struct sleepqueue *sq = sleepq_alloc();
+		if (sq != NULL) {
+			td->td_proc = &proc0;
+			td->td_ucred = proc0.p_ucred;
+			td->td_thread = thread;
+			td->td_sleepqueue = sq;
+			crhold(td->td_ucred);
+		} else {
+			free(td, M_TEMP);
+			td = NULL;
+		}
 	}
 
 	thread->extensions[rtems_bsd_extension_index] = td;
@@ -167,6 +171,7 @@ rtems_bsd_extension_thread_delete(
 	if (td != NULL) {
 		seltdfini(td);
 		sleepq_free(td->td_sleepqueue);
+		crfree(td->td_ucred);
 		free(td, M_TEMP);
 	}
 }
@@ -303,7 +308,7 @@ kproc_create(void (*func)(void *), void *arg, struct proc **newpp, int flags, in
 	va_list ap;
 
 	va_start(ap, fmt);
-	eno = rtems_bsd_thread_start(newpp, func, arg, flags, pages, fmt, ap);
+	eno = rtems_bsd_thread_start((struct thread**) newpp, func, arg, flags, pages, fmt, ap);
 	va_end(ap);
 
 	return eno;
@@ -331,6 +336,8 @@ kthread_add(void (*func)(void *), void *arg, struct proc *p, struct thread **new
 	va_list ap;
 
 	va_start(ap, fmt);
+	/* the cast here is a hack but passing a proc as a thread struct is just wrong and I
+	 * have no idea why it is like this */
 	eno = rtems_bsd_thread_start(newtdp, func, arg, flags, pages, fmt, ap);
 	va_end(ap);