Module: xenomai-forge
Branch: next
Commit: 7574e138a59bd28da06b16299eb2da196cc2fce9
URL:
http://git.xenomai.org/?p=xenomai-forge.git;a=commit;h=7574e138a59bd28da06b16299eb2da196cc2fce9
Author: Philippe Gerum <r...@xenomai.org>
Date: Tue Aug 26 15:43:57 2014 +0200
cobalt/posix/syscall: provide fastcall handler
This patch introduces the client-side handler for the fast syscall
routing feature available with the upcoming pipelines.
A fastcall handler (i.e. ipipe_fastcall_hook) is immediately called
from the low level trap code, for handling a client syscall issued by
a thread which executes from the primary domain, instead of going
through the slower pipelined path.
- the fastcall handler is invoked for Cobalt syscalls as defined in
include/cobalt/uapi/syscalls.h only, otherwise the syscall is passed
to ipipe_syscall_hook.
- the fastcall handler may migrate the caller to the root domain if
required.
- no propagation is possible from the fastcall handler to the regular
kernel syscall code, i.e.: ipipe_fastcall_hook shall succeed or fail
handling the syscall, but may not offload it to the regular kernel
by returning KEVENT_PROPAGATE.
- if the pipeline does not support fastcall routing,
ipipe_syscall_hook is invoked for handling all syscalls as
previously.
---
kernel/cobalt/posix/syscall.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/kernel/cobalt/posix/syscall.c b/kernel/cobalt/posix/syscall.c
index 4e8e0de..747b2be 100644
--- a/kernel/cobalt/posix/syscall.c
+++ b/kernel/cobalt/posix/syscall.c
@@ -395,6 +395,16 @@ int ipipe_syscall_hook(struct ipipe_domain *ipd, struct
pt_regs *regs)
return handle_head_syscall(ipd, regs);
}
+int ipipe_fastcall_hook(struct pt_regs *regs)
+{
+ int ret;
+
+ ret = handle_head_syscall(&xnsched_realtime_domain, regs);
+ XENO_BUGON(NUCLEUS, ret == KEVENT_PROPAGATE);
+
+ return ret;
+}
+
static int cobalt_migrate(int domain)
{
struct xnthread *thread = xnthread_current();
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