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path: root/drivers/gpu/drm/nouveau/nvif/unpack.h
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvif/unpack.h')
-rw-r--r--drivers/gpu/drm/nouveau/nvif/unpack.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvif/unpack.h b/drivers/gpu/drm/nouveau/nvif/unpack.h
new file mode 100644
index 000000000000..5933188b4a77
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvif/unpack.h
@@ -0,0 +1,24 @@
+#ifndef __NVIF_UNPACK_H__
+#define __NVIF_UNPACK_H__
+
+#define nvif_unvers(d) ({ \
+ ret = (size == sizeof(d)) ? 0 : -ENOSYS; \
+ (ret == 0); \
+})
+
+#define nvif_unpack(d,vl,vh,m) ({ \
+ if ((vl) == 0 || ret == -ENOSYS) { \
+ int _size = sizeof(d); \
+ if (_size <= size && (d).version >= (vl) && \
+ (d).version <= (vh)) { \
+ data = (u8 *)data + _size; \
+ size = size - _size; \
+ ret = ((m) || !size) ? 0 : -E2BIG; \
+ } else { \
+ ret = -ENOSYS; \
+ } \
+ } \
+ (ret == 0); \
+})
+
+#endif