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74 lines
1.9 KiB
74 lines
1.9 KiB
/* |
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* Compact binary representation of ihex records. Some devices need their |
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* firmware loaded in strange orders rather than a single big blob, but |
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* actually parsing ihex-as-text within the kernel seems silly. Thus,... |
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*/ |
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#ifndef __LINUX_IHEX_H__ |
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#define __LINUX_IHEX_H__ |
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#include <linux/types.h> |
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#include <linux/firmware.h> |
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#include <linux/device.h> |
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/* Intel HEX files actually limit the length to 256 bytes, but we have |
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drivers which would benefit from using separate records which are |
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longer than that, so we extend to 16 bits of length */ |
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struct ihex_binrec { |
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__be32 addr; |
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__be16 len; |
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uint8_t data[0]; |
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} __attribute__((packed)); |
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/* Find the next record, taking into account the 4-byte alignment */ |
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static inline const struct ihex_binrec * |
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ihex_next_binrec(const struct ihex_binrec *rec) |
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{ |
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int next = ((be16_to_cpu(rec->len) + 5) & ~3) - 2; |
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rec = (void *)&rec->data[next]; |
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return be16_to_cpu(rec->len) ? rec : NULL; |
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} |
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/* Check that ihex_next_binrec() won't take us off the end of the image... */ |
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static inline int ihex_validate_fw(const struct firmware *fw) |
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{ |
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const struct ihex_binrec *rec; |
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size_t ofs = 0; |
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while (ofs <= fw->size - sizeof(*rec)) { |
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rec = (void *)&fw->data[ofs]; |
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/* Zero length marks end of records */ |
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if (!be16_to_cpu(rec->len)) |
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return 0; |
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/* Point to next record... */ |
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ofs += (sizeof(*rec) + be16_to_cpu(rec->len) + 3) & ~3; |
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} |
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return -EINVAL; |
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} |
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/* Request firmware and validate it so that we can trust we won't |
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* run off the end while reading records... */ |
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static inline int request_ihex_firmware(const struct firmware **fw, |
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const char *fw_name, |
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struct device *dev) |
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{ |
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const struct firmware *lfw; |
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int ret; |
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ret = request_firmware(&lfw, fw_name, dev); |
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if (ret) |
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return ret; |
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ret = ihex_validate_fw(lfw); |
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if (ret) { |
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dev_err(dev, "Firmware \"%s\" not valid IHEX records\n", |
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fw_name); |
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release_firmware(lfw); |
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return ret; |
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} |
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*fw = lfw; |
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return 0; |
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} |
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#endif /* __LINUX_IHEX_H__ */
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