1 files changed, 78 insertions, 0 deletions
diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
new file mode 100644
index 0000000..9995f51
--- /dev/null
+++ b/sys/kern/kern_exit.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/proc.h>
+#include <sys/sched.h>
+#include <vm/physmem.h>
+#include <vm/dynalloc.h>
+#include <vm/vm.h>
+
+/*
+ * Kill a thread and deallocate its resources.
+ *
+ * @td: Thread to exit
+ */
+int
+exit1(struct proc *td)
+{
+    struct pcb *pcbp;
+    struct proc *curtd;
+    uintptr_t stack;
+    pid_t target_pid, curpid;
+
+    target_pid = td->pid;
+    curtd = this_td();
+    pcbp = &td->pcb;
+
+    curpid = curtd->pid;
+    stack = td->stack_base;
+    td->flags |= PROC_EXITING;
+
+    /*
+     * If this is on the higher half, it is kernel
+     * mapped and we need to convert it to a physical
+     * address.
+     */
+    if (stack >= VM_HIGHER_HALF) {
+        stack -= VM_HIGHER_HALF;
+    }
+
+    vm_free_frame(stack, PROC_STACK_PAGES);
+    pmap_destroy_vas(pcbp->addrsp);
+    dynfree(td);
+
+    /*
+     * If we are the thread exiting, reenter the scheduler
+     * and do not return.
+     */
+    if (target_pid == curpid)
+        sched_enter();
+
+    return 0;
+}