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@@ -1,12 +1,20 @@
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#ifndef _LINUX_COMPAT_H_
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#define _LINUX_COMPAT_H_
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+#include <console.h>
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#include <log.h>
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#include <malloc.h>
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+
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+#include <asm/processor.h>
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+
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#include <linux/types.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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+#ifdef CONFIG_XEN
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+#include <xen/events.h>
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+#endif
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+
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struct unused {};
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typedef struct unused unused_t;
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@@ -122,6 +130,52 @@ static inline void kmem_cache_destroy(struct kmem_cache *cachep)
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#define add_wait_queue(...) do { } while (0)
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#define remove_wait_queue(...) do { } while (0)
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+#ifndef CONFIG_XEN
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+#define eventchn_poll()
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+#endif
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+
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+#define __wait_event_timeout(condition, timeout, ret) \
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+({ \
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+ ulong __ret = ret; /* explicit shadow */ \
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+ ulong start = get_timer(0); \
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+ for (;;) { \
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+ eventchn_poll(); \
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+ if (condition) { \
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+ __ret = 1; \
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+ break; \
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+ } \
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+ if ((get_timer(start) > timeout) || ctrlc()) { \
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+ __ret = 0; \
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+ break; \
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+ } \
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+ cpu_relax(); \
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+ } \
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+ __ret; \
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+})
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+
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+/**
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+ * wait_event_timeout() - Wait until the event occurs before the timeout.
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+ * @wr_head: The wait queue to wait on.
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+ * @condition: Expression for the event to wait for.
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+ * @timeout: Maximum waiting time.
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+ *
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+ * We wait until the @condition evaluates to %true (succeed) or
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+ * %false (@timeout elapsed).
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+ *
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+ * Return:
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+ * 0 - if the @condition evaluated to %false after the @timeout elapsed
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+ * 1 - if the @condition evaluated to %true
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+ */
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+#define wait_event_timeout(wq_head, condition, timeout) \
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+({ \
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+ ulong __ret; \
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+ if (condition) \
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+ __ret = 1; \
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+ else \
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+ __ret = __wait_event_timeout(condition, timeout, __ret);\
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+ __ret; \
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+})
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+
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#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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/* This is also defined in ARMv8's mmu.h */
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