1 files changed, 139 insertions, 0 deletions
diff --git a/kern/thread.c b/kern/thread.c
new file mode 100644
index 00000000..24498b01
--- /dev/null
+++ b/kern/thread.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2012 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <kern/error.h>
+#include <kern/init.h>
+#include <kern/kmem.h>
+#include <kern/list.h>
+#include <kern/macros.h>
+#include <kern/param.h>
+#include <kern/stddef.h>
+#include <kern/string.h>
+#include <kern/thread.h>
+#include <machine/cpu.h>
+#include <machine/tcb.h>
+
+/*
+ * Make sure thread stacks are properly aligned.
+ */
+#define THREAD_STACK_ALIGN 8
+
+/*
+ * Per processor run queue.
+ */
+struct thread_runq {
+    struct list threads;
+} __aligned(CPU_L1_SIZE);
+
+/*
+ * Per-processor run queues.
+ */
+static struct thread_runq thread_runqs[MAX_CPUS];
+
+/*
+ * Caches for allocated threads and their stacks.
+ */
+static struct kmem_cache thread_cache;
+static struct kmem_cache thread_stack_cache;
+
+static void __init
+thread_runq_init(struct thread_runq *runq)
+{
+    list_init(&runq->threads);
+}
+
+void __init
+thread_setup(void)
+{
+    size_t i;
+
+    tcb_setup();
+
+    kmem_cache_init(&thread_cache, "thread", sizeof(struct thread),
+                    0, NULL, NULL, NULL, 0);
+    kmem_cache_init(&thread_stack_cache, "thread_stack", STACK_SIZE,
+                    THREAD_STACK_ALIGN, NULL, NULL, NULL, 0);
+
+    for (i = 0; i < ARRAY_SIZE(thread_runqs); i++)
+        thread_runq_init(&thread_runqs[i]);
+}
+
+int
+thread_create(struct thread **threadp, const char *name, struct task *task,
+              thread_run_fn_t run_fn, void *arg)
+{
+    struct thread *thread;
+    struct tcb *tcb;
+    void *stack;
+    int error;
+
+    thread = kmem_cache_alloc(&thread_cache);
+
+    if (thread == NULL) {
+        error = ERROR_NOMEM;
+        goto error_thread;
+    }
+
+    stack = kmem_cache_alloc(&thread_stack_cache);
+
+    if (stack == NULL) {
+        error = ERROR_NOMEM;
+        goto error_stack;
+    }
+
+    error = tcb_create(&tcb, stack, thread);
+
+    if (error)
+        goto error_tcb;
+
+    if (name == NULL)
+        name = task->name;
+
+    /* XXX Assign all threads to the main processor for now */
+    thread->tcb = tcb;
+    list_insert_tail(&thread_runqs[0].threads, &thread->runq_node);
+    task_add_thread(task, thread);
+    thread->task = task;
+    thread->stack = stack;
+    strlcpy(thread->name, name, sizeof(thread->name));
+    thread->run_fn = run_fn;
+    thread->arg = arg;
+    *threadp = thread;
+    return 0;
+
+error_tcb:
+    kmem_cache_free(&thread_stack_cache, stack);
+error_stack:
+    kmem_cache_free(&thread_cache, thread);
+error_thread:
+    return error;
+}
+
+void __init
+thread_load(struct thread *thread)
+{
+    tcb_load(thread->tcb);
+}
+
+void
+thread_main(struct thread *thread)
+{
+    thread->run_fn(thread->arg);
+
+    for (;;)
+        cpu_idle();
+}