[RFC v4 3/8] xen/linux_compat: Add a Linux compat header

[Sameer Goel <sameer.goel@linaro.org>]

For porting files directly from Linux it is useful to have a function mapping
definitions from Linux to Xen. This file adds common API functions and
other defines that are needed for porting arm SMMU drivers.

Signed-off-by: Sameer Goel <sameer.goel@linaro.org>
---
 xen/include/xen/linux_compat.h | 81 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 xen/include/xen/linux_compat.h

diff --git a/xen/include/xen/linux_compat.h b/xen/include/xen/linux_compat.h
new file mode 100644
index 0000000000..174d0390e5
--- /dev/null
+++ b/xen/include/xen/linux_compat.h
@@ -0,0 +1,81 @@
+/******************************************************************************
+ * include/xen/linux_compat.h
+ *
+ * Compatibility defines for porting code from Linux to Xen
+ *
+ * Copyright (c) 2017 Linaro Limited
+ *
+ * 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 2 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/>.
+ */
+
+#ifndef __XEN_LINUX_COMPAT_H__
+#define __XEN_LINUX_COMPAT_H__
+
+#include <asm/types.h>
+
+typedef paddr_t phys_addr_t;
+typedef paddr_t dma_addr_t;
+
+typedef unsigned int gfp_t;
+#define GFP_KERNEL 0
+#define __GFP_ZERO 0
+
+/* Alias to Xen device tree helpers */
+#define device_node dt_device_node
+#define of_phandle_args dt_phandle_args
+#define of_device_id dt_device_match
+#define of_match_node dt_match_node
+#define of_property_read_u32(np, pname, out) (!dt_property_read_u32(np, pname, out))
+#define of_property_read_bool dt_property_read_bool
+#define of_parse_phandle_with_args dt_parse_phandle_with_args
+
+/* Helpers for IRQ functions */
+#define free_irq release_irq
+
+enum irqreturn {
+    IRQ_NONE    = (0 << 0),
+    IRQ_HANDLED = (1 << 0),
+    IRQ_WAKE_THREAD = (2 << 0),
+};
+
+typedef enum irqreturn irqreturn_t;
+
+/* Device logger functions */
+#define dev_print(dev, lvl, fmt, ...)                       \
+     printk(lvl fmt, ## __VA_ARGS__)
+
+#define dev_dbg(dev, fmt, ...) dev_print(dev, XENLOG_DEBUG, fmt, ## __VA_ARGS__)
+#define dev_notice(dev, fmt, ...) dev_print(dev, XENLOG_INFO, fmt, ## __VA_ARGS__)
+#define dev_warn(dev, fmt, ...) dev_print(dev, XENLOG_WARNING, fmt, ## __VA_ARGS__)
+#define dev_err(dev, fmt, ...) dev_print(dev, XENLOG_ERR, fmt, ## __VA_ARGS__)
+#define dev_info(dev, fmt, ...) dev_print(dev, XENLOG_INFO, fmt, ## __VA_ARGS__)
+
+#define dev_err_ratelimited(dev, fmt, ...)                  \
+     dev_print(dev, XENLOG_ERR, fmt, ## __VA_ARGS__)
+
+#define dev_name(dev) dt_node_full_name(dev_to_dt(dev))
+
+/* Alias to Xen allocation helpers */
+#define kfree xfree
+#define kmalloc(size, flags)        _xmalloc(size, sizeof(void *))
+#define kzalloc(size, flags)        _xzalloc(size, sizeof(void *))
+#define devm_kzalloc(dev, size, flags)  _xzalloc(size, sizeof(void *))
+#define kmalloc_array(size, n, flags)   _xmalloc_array(size, sizeof(void *), n)
+
+/* Alias to Xen time functions */
+#define ktime_t s_time_t
+#define ktime_add_us(t,i)       (NOW() + MICROSECS(i))
+#define ktime_compare(t,i)      (NOW() > (i))
+
+#endif /* __XEN_LINUX_COMPAT_H__ */
-- 
2.14.1


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