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authorIan Moffett <ian@osmora.org>2024-06-08 18:19:51 -0400
committerIan Moffett <ian@osmora.org>2024-06-08 18:19:51 -0400
commit55845113211400c9b1657ec3ce72b06a05efac4e (patch)
treeda6030d824feeec4885f222c66ffdae988d70472 /sys/kern
parent71f56e9075d34fa560b23a448d58731c270aa050 (diff)
kernel/amd64: Prepare for scheduler
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys/kern')
-rw-r--r--sys/kern/init_main.c5
-rw-r--r--sys/kern/kern_sched.c102
2 files changed, 107 insertions, 0 deletions
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 94fa8c0..6018dfe 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -29,6 +29,7 @@
#include <sys/reboot.h>
#include <sys/syslog.h>
+#include <sys/sched.h>
#include <dev/cons/cons.h>
#include <dev/acpi/acpi.h>
#include <machine/cpu.h>
@@ -51,6 +52,10 @@ main(void)
/* Startup the BSP */
cpu_startup(&g_bsp_ci);
+ /* Start scheduler and bootstrap APs */
+ sched_init();
+ mp_bootstrap_aps(&g_bsp_ci);
+
/* Nothing left to do... halt */
cpu_reboot(REBOOT_HALT);
__builtin_unreachable();
diff --git a/sys/kern/kern_sched.c b/sys/kern/kern_sched.c
new file mode 100644
index 0000000..b79d682
--- /dev/null
+++ b/sys/kern/kern_sched.c
@@ -0,0 +1,102 @@
+/*
+ * 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/types.h>
+#include <sys/sched.h>
+#include <sys/schedvar.h>
+#include <sys/cdefs.h>
+#include <sys/syslog.h>
+#include <machine/frame.h>
+#include <dev/timer.h>
+#include <assert.h>
+
+#define pr_trace(fmt, ...) kprintf("ksched: " fmt, ##__VA_ARGS__)
+
+void sched_switch(struct trapframe *tf);
+
+static sched_policy_t policy = SCHED_POLICY_RR;
+
+/*
+ * Thread ready queues - all threads ready to be
+ * scheduled should be added to the toplevel queue.
+ */
+static struct sched_queue qlist[SCHED_NQUEUE];
+
+/*
+ * Perform timer oneshot
+ */
+static inline void
+sched_oneshot(bool now)
+{
+ struct timer timer;
+ size_t usec = now ? SHORT_TIMESLICE_USEC : DEFAULT_TIMESLICE_USEC;
+ tmrr_status_t tmr_status;
+
+ tmr_status = req_timer(TIMER_SCHED, &timer);
+ __assert(tmr_status == TMRR_SUCCESS);
+
+ timer.oneshot_us(usec);
+}
+
+/*
+ * Perform a context switch.
+ *
+ * TODO
+ */
+void
+sched_switch(struct trapframe *tf)
+{
+ static struct spinlock lock = {0};
+
+ spinlock_acquire(&lock);
+ spinlock_release(&lock);
+ sched_oneshot(false);
+}
+
+/*
+ * Main scheduler loop
+ */
+void
+sched_enter(void)
+{
+ sched_oneshot(false);
+ for (;;);
+}
+
+void
+sched_init(void)
+{
+ /* Setup the queues */
+ for (int i = 0; i < SCHED_NQUEUE; ++i) {
+ TAILQ_INIT(&qlist[i].q);
+ }
+
+ pr_trace("Prepared %d queues (policy=0x%x)\n",
+ SCHED_NQUEUE, policy);
+}