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| -rw-r--r-- | include/linux/ihex.h | 50 |
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__ */ |