loader.efi: efipart needs to use ioalign
UEFI specification 2.7A, EFI_BLOCK_IO_PROTOCOL, page 566. The ioalign property does define the alignment of data buffer. If the alignment is required and our buffer is not aligned, or if the data buffer is not multiple of Blocksize, we need to use bounce buffer to perform the block IO. This is much like with BIOS version, except there the INT13 needs buffer to be located in low memory. Additionally, we need to handle disk writes properly.
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11db1a1654
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@ -64,6 +64,9 @@ static int efipart_printhd(int);
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#define PNP0700 0x700
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#define PNP0701 0x701
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/* Bounce buffer max size */
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#define BIO_BUFFER_SIZE 0x4000
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struct devsw efipart_fddev = {
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.dv_name = "fd",
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.dv_type = DEVT_FD,
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@ -266,6 +269,12 @@ efipart_inithandles(void)
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continue;
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}
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/* Allowed values are 0, 1 and power of 2. */
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if (blkio->Media->IoAlign > 1 &&
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!powerof2(blkio->Media->IoAlign)) {
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continue;
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}
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/* This is bad. */
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if ((pd = calloc(1, sizeof(*pd))) == NULL) {
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printf("efipart_inithandles: Out of memory.\n");
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@ -979,8 +988,10 @@ efipart_realstrategy(void *devdata, int rw, daddr_t blk, size_t size,
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EFI_BLOCK_IO *blkio;
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uint64_t off, disk_blocks, d_offset = 0;
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char *blkbuf;
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size_t blkoff, blksz;
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int error;
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size_t blkoff, blksz, bio_size;
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unsigned ioalign;
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bool need_buf;
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int rc;
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uint64_t diskend, readstart;
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if (dev == NULL || blk < 0)
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@ -1028,40 +1039,118 @@ efipart_realstrategy(void *devdata, int rw, daddr_t blk, size_t size,
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size = size * blkio->Media->BlockSize;
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}
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if (rsize != NULL)
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*rsize = size;
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need_buf = true;
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/* Do we need bounce buffer? */
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if ((size % blkio->Media->BlockSize == 0) &&
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(off % blkio->Media->BlockSize == 0))
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return (efipart_readwrite(blkio, rw,
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off / blkio->Media->BlockSize,
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size / blkio->Media->BlockSize, buf));
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need_buf = false;
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/* Do we have IO alignment requirement? */
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ioalign = blkio->Media->IoAlign;
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if (ioalign == 0)
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ioalign++;
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if (ioalign > 1 && (uintptr_t)buf != roundup2((uintptr_t)buf, ioalign))
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need_buf = true;
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if (need_buf) {
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for (bio_size = BIO_BUFFER_SIZE; bio_size > 0;
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bio_size -= blkio->Media->BlockSize) {
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blkbuf = memalign(ioalign, bio_size);
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if (blkbuf != NULL)
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break;
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}
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} else {
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blkbuf = buf;
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bio_size = size;
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}
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/*
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* The buffer size is not a multiple of the media block size.
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*/
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blkbuf = malloc(blkio->Media->BlockSize);
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if (blkbuf == NULL)
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return (ENOMEM);
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error = 0;
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if (rsize != NULL)
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*rsize = size;
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rc = 0;
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blk = off / blkio->Media->BlockSize;
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blkoff = off % blkio->Media->BlockSize;
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blksz = blkio->Media->BlockSize - blkoff;
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while (size > 0) {
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error = efipart_readwrite(blkio, rw, blk, 1, blkbuf);
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if (error)
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size_t x = min(size, bio_size);
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if (x < blkio->Media->BlockSize)
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x = 1;
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else
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x /= blkio->Media->BlockSize;
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switch (rw & F_MASK) {
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case F_READ:
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blksz = blkio->Media->BlockSize * x - blkoff;
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if (size < blksz)
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blksz = size;
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rc = efipart_readwrite(blkio, rw, blk, x, blkbuf);
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if (rc != 0)
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goto error;
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if (need_buf)
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bcopy(blkbuf + blkoff, buf, blksz);
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break;
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if (size < blksz)
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blksz = size;
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bcopy(blkbuf + blkoff, buf, blksz);
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case F_WRITE:
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rc = 0;
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if (blkoff != 0) {
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/*
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* We got offset to sector, read 1 sector to
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* blkbuf.
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*/
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x = 1;
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blksz = blkio->Media->BlockSize - blkoff;
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blksz = min(blksz, size);
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rc = efipart_readwrite(blkio, F_READ, blk, x,
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blkbuf);
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} else if (size < blkio->Media->BlockSize) {
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/*
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* The remaining block is not full
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* sector. Read 1 sector to blkbuf.
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*/
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x = 1;
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blksz = size;
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rc = efipart_readwrite(blkio, F_READ, blk, x,
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blkbuf);
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} else {
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/* We can write full sector(s). */
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blksz = blkio->Media->BlockSize * x;
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}
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if (rc != 0)
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goto error;
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/*
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* Put your Data In, Put your Data out,
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* Put your Data In, and shake it all about
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*/
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if (need_buf)
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bcopy(buf, blkbuf + blkoff, blksz);
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rc = efipart_readwrite(blkio, F_WRITE, blk, x, blkbuf);
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if (rc != 0)
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goto error;
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break;
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default:
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/* DO NOTHING */
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rc = EROFS;
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goto error;
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}
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blkoff = 0;
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buf += blksz;
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size -= blksz;
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blk++;
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blkoff = 0;
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blksz = blkio->Media->BlockSize;
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blk += x;
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}
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free(blkbuf);
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return (error);
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error:
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if (rsize != NULL)
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*rsize -= size;
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if (need_buf)
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free(blkbuf);
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return (rc);
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}
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