linux-kernel - [PATCH 3/6] syslet: introduce abi structs

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Date:	Thu,  6 Dec 2007 15:20:16 -0800
From:	Zach Brown <zach.brown@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ulrich Drepper <drepper@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dan Williams <dan.j.williams@...il.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Simon Holm Thogersen <odie@...aau.dk>,
	suresh.b.siddha@...el.com
Subject: [PATCH 3/6] syslet: introduce abi structs

This patch adds the architecture independent structures of the
syslet ABI.

Signed-off-by: Zach Brown <zach.brown@...cle.com>

diff --git a/include/linux/syslet-abi.h b/include/linux/syslet-abi.h
new file mode 100644
index 0000000..a8bc1a3
--- /dev/null
+++ b/include/linux/syslet-abi.h
@@ -0,0 +1,34 @@
+#ifndef _LINUX_SYSLET_ABI_H
+#define _LINUX_SYSLET_ABI_H
+
+#include <asm/syslet-abi.h> /* for struct syslet_frame */
+
+struct syslet_args {
+	u64 completion_ring_ptr;
+	u64 caller_data;
+	struct syslet_frame frame;
+};
+
+struct syslet_completion {
+	u64 status;
+	u64 caller_data;
+};
+
+/*
+ * The ring follows the "wrapping" convention as described by Andrew at:
+ * 	http://lkml.org/lkml/2007/4/11/276
+ * The head is updated by the kernel as completions are added and the
+ * tail is updated by userspace as completions are removed.
+ *
+ * The number of elements must be a power of two and the ring must be
+ * aligned to a u64.
+ */
+struct syslet_ring {
+	u32 kernel_head;
+	u32 user_tail;
+	u32 elements;
+	u32 wait_group;
+	struct syslet_completion comp[0];
+};
+
+#endif
-- 
1.5.2.2

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