From ba8c7b300fbbf062453ef8858fac0f84dd25a518 Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Tue, 20 Sep 2022 15:59:25 +0300
Subject: add notify syscall skeleton

+ Now to actually start implementing shit. :)
---
 common/uapi/ipc.c       | 18 ++++++++++++++++++
 common/uapi/proc.c      | 14 --------------
 include/apos/syscalls.h |  3 +++
 include/apos/uapi.h     | 24 ++++++++++++------------
 4 files changed, 33 insertions(+), 26 deletions(-)

diff --git a/common/uapi/ipc.c b/common/uapi/ipc.c
index ecfced5..fa0376a 100644
--- a/common/uapi/ipc.c
+++ b/common/uapi/ipc.c
@@ -76,3 +76,21 @@ SYSCALL_DEFINE4(ipc_resp)(sys_arg_t d0, sys_arg_t d1, sys_arg_t d2,
 	/* something like return_from_callback(t, r) */
 	return (struct sys_ret){ OK, t->tid, d0, d1, d2, d3 };
 }
+
+/**
+ * Notify syscall handler.
+ *
+ * \todo Implement.
+ *
+ * @param tid Thread ID to notify.
+ * @param swap Whether to swap immediately if possible.
+ * @param a0 Argument 0.
+ * @param a1 Argument 1.
+ * @return \ref OK and 0.
+ */
+SYSCALL_DEFINE4(ipc_notify)(sys_arg_t tid, sys_arg_t swap,
+                            sys_arg_t a0, sys_arg_t a1){
+	/** \todo masquerade as kernel call, set from to 0 and set us as
+	 * notify type, with arguments a0 and a1 as user-configurable data. */
+	return (struct sys_ret){ OK, 0, 0 /* type */, 0 /* from */, a0, a1 };
+}
diff --git a/common/uapi/proc.c b/common/uapi/proc.c
index ba9fb76..67fe141 100644
--- a/common/uapi/proc.c
+++ b/common/uapi/proc.c
@@ -94,20 +94,6 @@ SYSCALL_DEFINE0(kill)()
 	return (struct sys_ret){ OK, 0, 0, 0, 0, 0};
 }
 
-/**
- * Signal syscall handler.
- *
- * \todo Implement.
- *
- * @param tid Thread ID to signal.
- * @param signal Signal to send to \c tid.
- * @param swap Whether to immediately swap to thread.
- * @return \ref OK and 0.
- */
-SYSCALL_DEFINE3(signal)(sys_arg_t tid, sys_arg_t signal, sys_arg_t swap){
-	return (struct sys_ret){ OK, 0, 0, 0, 0, 0 };
-}
-
 /**
  * Swap syscall handler.
  *
diff --git a/include/apos/syscalls.h b/include/apos/syscalls.h
index 0a6f0c7..1746255 100644
--- a/include/apos/syscalls.h
+++ b/include/apos/syscalls.h
@@ -79,6 +79,9 @@ enum {
 
 	/** IPC response from server. */
 	SYS_IPC_RESP,
+
+	/** IPC notify thread, essentially interrupt or signal. */
+	SYS_IPC_NOTIFY
 	/** @} */
 
 	/** @name Process management. */
diff --git a/include/apos/uapi.h b/include/apos/uapi.h
index d0ce350..4fab0ec 100644
--- a/include/apos/uapi.h
+++ b/include/apos/uapi.h
@@ -474,6 +474,18 @@ SYSCALL_DECLARE5(ipc_fwd, pid, d0, d1, d2, d3);
  * @return \c d0 and \c d1.
  */
 SYSCALL_DECLARE4(ipc_resp, d0, d1, d2, d3);
+
+/**
+ * Notify thread syscall.
+ *
+ * @param tid Thread ID to notify.
+ * @param swap Whether to immediately swap.
+ * @param a0 Argument 0.
+ * @param a1 Argument 1.
+ * @param e Unused.
+ * @return \ref OK and 0.
+ */
+SYSCALL_DECLARE4(notify, tid, swap, a0, a1);
 /** @} */
 
 /** @name Process handling syscalls. */
@@ -534,18 +546,6 @@ SYSCALL_DECLARE2(exec, bin, interp);
  */
 SYSCALL_DECLARE1(kill, tid);
 
-/**
- * Signal process syscall.
- *
- * @param tid Thread ID to signal.
- * @param signal Signal to send.
- * @param swap Whether to immediately swap.
- * @param d Unused.
- * @param e Unused.
- * @return \ref OK and 0.
- */
-SYSCALL_DECLARE3(signal, tid, signal, swap);
-
 /**
  * Swap syscall.
  *
-- 
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