gwj / at91sam9263 · Commits

Commit 091d055b3e6cab13ac3d6b151fcacdcfc059f03e

Authored by balrog
1 parent a60de947

Fix ATAPI GET_CONFIGURATION function (Alexander Graf, Carlo Marcelo Arenas Belon). 

The current implementation of GET_CONFIGURATION in the ATAPI stack of qemu
replies a different length depending on the buffer, the data should be
written into.

On the other hand the SCSI spec defines that length information has to be
consistent and independent of return buffer lengths.

This patch makes the ATAPI emulation behave according to the spec and fixes
the Darwin DVD driver.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Kevin Wolf <kwolf@suse.de>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4649 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 1 changed file with 12 additions and 15 deletions
hw/ide.c
  View file @091d055
... ... @@ -1715,6 +1715,7 @@ static void ide_atapi_cmd(IDEState *s)
1715 1715 case GPCMD_GET_CONFIGURATION:
1716 1716 {
1717 1717 uint32_t len;
  1718 + uint8_t index = 0;
1718 1719  
1719 1720 /* only feature 0 is supported */
1720 1721 if (packet[2] != 0 || packet[3] != 0) {
... ... @@ -1725,12 +1726,13 @@ static void ide_atapi_cmd(IDEState *s)
1725 1726  
1726 1727 /* XXX: could result in alignment problems in some architectures */
1727 1728 max_len = ube16_to_cpu(packet + 7);
  1729 +
1728 1730 /*
1729   - * XXX: avoid overflow for io_buffer if max_len is bigger than the
1730   - * size of that buffer (dimensioned to max number of sectors
1731   - * to transfer at once)
  1731 + * XXX: avoid overflow for io_buffer if max_len is bigger than
  1732 + * the size of that buffer (dimensioned to max number of
  1733 + * sectors to transfer at once)
1732 1734 *
1733   - * Only a problem if the feature/profiles grow exponentially.
  1735 + * Only a problem if the feature/profiles grow.
1734 1736 */
1735 1737 if (max_len > 512) /* XXX: assume 1 sector */
1736 1738 max_len = 512;
... ... @@ -1743,22 +1745,17 @@ static void ide_atapi_cmd(IDEState *s)
1743 1745 * XXX: fails to detect correctly DVDs with less data burned
1744 1746 * than what a CD can hold
1745 1747 */
1746   - if ((s -> nb_sectors)) {
1747   - if ((s -> nb_sectors > CD_MAX_SECTORS))
  1748 + if (s -> nb_sectors) {
  1749 + if (s -> nb_sectors > CD_MAX_SECTORS)
1748 1750 cpu_to_ube16(buf + 6, MMC_PROFILE_DVD_ROM);
1749 1751 else
1750 1752 cpu_to_ube16(buf + 6, MMC_PROFILE_CD_ROM);
1751 1753 }
1752 1754  
1753   - len = 8; /* header completed */
1754   - if (max_len > len) {
1755   - uint8_t index = 0;
1756   -
1757   - buf[10] = 0x02 | 0x01; /* persistent and current */
1758   - len += 4; /* header */
1759   - len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);
1760   - len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);
1761   - }
  1755 + buf[10] = 0x02 | 0x01; /* persistent and current */
  1756 + len = 12; /* headers: 8 + 4 */
  1757 + len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);
  1758 + len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);
1762 1759 cpu_to_ube32(buf, len - 4); /* data length */
1763 1760  
1764 1761 ide_atapi_cmd_reply(s, len, max_len);
... ...