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authorDavid Woodhouse <dwmw2@infradead.org>2008-05-30 13:57:27 +0300
committerDavid Woodhouse <David.Woodhouse@intel.com>2008-07-10 14:47:36 +0100
commitbacfe09dd7545467965e8d8f1eab20bc62dce00d (patch)
tree1f8b50e22439ef6d65089b3c5f875a6943b9c9df
parent88ecf814c47f577248751ddbe9626d98aeef5783 (diff)
ihex.h: binary representation of ihex records
Some devices need their firmware as a set of {address, len, data...} records in some specific order rather than a simple blob. The normal way of doing this kind of thing is 'ihex', which is a text format and not entirely suitable for use in the kernel. This provides a binary representation which is very similar, but much more compact -- and a helper routine to skip to the next record, because the alignment constraints mean that everybody will screw it up for themselves otherwise. Also a helper function which can verify that a 'struct firmware' contains a valid set of ihex records, and that following them won't run off the end of the loaded data. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
-rw-r--r--include/linux/ihex.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/include/linux/ihex.h b/include/linux/ihex.h
new file mode 100644
index 00000000000..df89edd890a
--- /dev/null
+++ b/include/linux/ihex.h
@@ -0,0 +1,50 @@
+/*
+ * Compact binary representation of ihex records. Some devices need their
+ * firmware loaded in strange orders rather than a single big blob, but
+ * actually parsing ihex-as-text within the kernel seems silly. Thus,...
+ */
+
+#ifndef __LINUX_IHEX_H__
+#define __LINUX_IHEX_H__
+
+#include <linux/types.h>
+#include <linux/firmware.h>
+
+/* Intel HEX files actually limit the length to 256 bytes, but we have
+ drivers which would benefit from using separate records which are
+ longer than that, so we extend to 16 bits of length */
+struct ihex_binrec {
+ __be32 addr;
+ __be16 len;
+ uint8_t data[0];
+} __attribute__((aligned(4)));
+
+/* Find the next record, taking into account the 4-byte alignment */
+static inline const struct ihex_binrec *
+ihex_next_binrec(const struct ihex_binrec *rec)
+{
+ int next = ((be16_to_cpu(rec->len) + 5) & ~3) - 2;
+ rec = (void *)&rec->data[next];
+
+ return be16_to_cpu(rec->len) ? rec : NULL;
+}
+
+/* Check that ihex_next_binrec() won't take us off the end of the image... */
+static inline int ihex_validate_fw(const struct firmware *fw)
+{
+ const struct ihex_binrec *rec;
+ size_t ofs = 0;
+
+ while (ofs <= fw->size - sizeof(*rec)) {
+ rec = (void *)&fw->data[ofs];
+
+ /* Zero length marks end of records */
+ if (!be16_to_cpu(rec->len))
+ return 0;
+
+ /* Point to next record... */
+ ofs += (sizeof(*rec) + be16_to_cpu(rec->len) + 3) & ~3;
+ }
+ return -EINVAL;
+}
+#endif /* __LINUX_IHEX_H__ */