[POWERPC] Merge in outstanding changes from xenppc-unstable.hg.

It's a long story, but basically a small divergence in xenppc-unstable meant a
large number of changesets couldn't be directly imported to xen-unstable, so
this changeset includes all of them.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/xen/include/xen/xencomm.h b/xen/include/xen/xencomm.h
new file mode 100644
index 0000000000..e961cc6681
--- /dev/null
+++ b/xen/include/xen/xencomm.h
@@ -0,0 +1,115 @@
+/*
+ * 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, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (C) IBM Corp. 2006
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ */
+
+#ifndef __XENCOMM_H__
+#define __XENCOMM_H__
+
+#include <public/xen.h>
+
+extern unsigned long xencomm_copy_to_guest(void *to, const void *from,
+        unsigned int len, unsigned int skip); 
+extern unsigned long xencomm_copy_from_guest(void *to, const void *from,
+        unsigned int len, unsigned int skip); 
+extern int xencomm_add_offset(void **handle, unsigned int bytes);
+extern int xencomm_handle_is_null(void *ptr);
+
+
+static inline int xencomm_is_inline(const void *handle)
+{
+    unsigned long addr = (unsigned long)handle;
+    return (addr & XENCOMM_INLINE_FLAG) == XENCOMM_INLINE_FLAG;
+}
+
+static inline unsigned long xencomm_inline_addr(const void *handle)
+{
+	return (unsigned long)handle & ~XENCOMM_INLINE_FLAG;
+}
+
+/* Is the guest handle a NULL reference? */
+#define guest_handle_is_null(hnd) \
+    ((hnd).p == NULL || xencomm_handle_is_null((hnd).p))
+
+/* Offset the given guest handle into the array it refers to. */
+#define guest_handle_add_offset(hnd, nr) ({         \
+    const typeof((hnd).p) _ptr;                     \
+    xencomm_add_offset((void **)&((hnd).p), nr * sizeof(*_ptr));   \
+})
+
+/* Cast a guest handle to the specified type of handle. */
+#define guest_handle_cast(hnd, type) ({         \
+    type *_x = (hnd).p;                         \
+    XEN_GUEST_HANDLE(type) _y; \
+    set_xen_guest_handle(_y, _x); \
+    _y; \
+})
+
+/* Since we run in real mode, we can safely access all addresses. That also
+ * means our __routines are identical to our "normal" routines. */
+#define guest_handle_okay(hnd, nr) 1
+
+/*
+ * Copy an array of objects to guest context via a guest handle.
+ * Optionally specify an offset into the guest array.
+ */
+#define copy_to_guest_offset(hnd, idx, ptr, nr) \
+    __copy_to_guest_offset(hnd, idx, ptr, nr)
+
+/* Copy sub-field of a structure to guest context via a guest handle. */
+#define copy_field_to_guest(hnd, ptr, field) \
+    __copy_field_to_guest(hnd, ptr, field)
+
+/*
+ * Copy an array of objects from guest context via a guest handle.
+ * Optionally specify an offset into the guest array.
+ */
+#define copy_from_guest_offset(ptr, hnd, idx, nr) \
+    __copy_from_guest_offset(ptr, hnd, idx, nr)
+
+/* Copy sub-field of a structure from guest context via a guest handle. */
+#define copy_field_from_guest(ptr, hnd, field) \
+    __copy_field_from_guest(ptr, hnd, field)
+
+#define __copy_to_guest_offset(hnd, idx, ptr, nr) ({                \
+    const typeof(ptr) _x = (hnd).p;                                 \
+    const typeof(ptr) _y = (ptr);                                   \
+    xencomm_copy_to_guest(_x, _y, sizeof(*_x)*(nr), sizeof(*_x)*(idx)); \
+})
+
+#define __copy_field_to_guest(hnd, ptr, field) ({                   \
+    const int _off = offsetof(typeof(*ptr), field);                  \
+    const typeof(&(ptr)->field) _x = &(hnd).p->field;               \
+    const typeof(&(ptr)->field) _y = &(ptr)->field;                 \
+    xencomm_copy_to_guest(_x, _y, sizeof(*_x), sizeof(*_x)*(_off)); \
+})
+
+#define __copy_from_guest_offset(ptr, hnd, idx, nr) ({              \
+    const typeof(ptr) _x = (hnd).p;                                 \
+    const typeof(ptr) _y = (ptr);                                   \
+    xencomm_copy_from_guest(_y, _x, sizeof(*_x)*(nr), sizeof(*_x)*(idx));  \
+})
+
+#define __copy_field_from_guest(ptr, hnd, field) ({                 \
+    const int _off = offsetof(typeof(*ptr), field);                 \
+    const typeof(&(ptr)->field) _x = &(hnd).p->field;               \
+    const typeof(&(ptr)->field) _y = &(ptr)->field;                 \
+    xencomm_copy_to_guest(_y, _x, sizeof(*_x), sizeof(*_x)*(_off)); \
+})
+
+#endif /* __XENCOMM_H__ */