mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
85ebd00334
Fix both the IHEX firmware generation (len field always null, and EOF marker a byte too short) and loading (struct ihex_binrec needs to be packed to reflect the on-disk structure). Signed-off-by: Marc Zyngier <maz@misterjones.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
|
|
* 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>
|
|
#include <linux/device.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__((packed));
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* Request firmware and validate it so that we can trust we won't
|
|
* run off the end while reading records... */
|
|
static inline int request_ihex_firmware(const struct firmware **fw,
|
|
const char *fw_name,
|
|
struct device *dev)
|
|
{
|
|
const struct firmware *lfw;
|
|
int ret;
|
|
|
|
ret = request_firmware(&lfw, fw_name, dev);
|
|
if (ret)
|
|
return ret;
|
|
ret = ihex_validate_fw(lfw);
|
|
if (ret) {
|
|
dev_err(dev, "Firmware \"%s\" not valid IHEX records\n",
|
|
fw_name);
|
|
release_firmware(lfw);
|
|
return ret;
|
|
}
|
|
*fw = lfw;
|
|
return 0;
|
|
}
|
|
#endif /* __LINUX_IHEX_H__ */
|