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fixed possible rombios bug - according to comment in Bochs-Devs mailing list by David Laight

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Stanislav Shwartsman 2012-05-06 19:36:41 +00:00
parent 1ab623536c
commit 55e21bedcb
1 changed files with 2 additions and 2 deletions
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4
bochs/bios/rombios.c
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@ -2841,7 +2841,7 @@ Bit32u lba_low, lba_high;
// sector will be 0 only on lba access. Convert to lba-chs
if (sector == 0) {
if ((count >= 1 << 8) || lba_high || (lba_low + count >= 1UL << 28)) {
if ((count >= 1 << 8) || lba_high || (lba_low >= ((1UL << 28) - count))) {
outb(iobase1 + ATA_CB_FR, 0x00);
outb(iobase1 + ATA_CB_SC, (count >> 8) & 0xff);
outb(iobase1 + ATA_CB_SN, lba_low >> 24);
@ -2992,7 +2992,7 @@ Bit32u lba_low, lba_high;
// sector will be 0 only on lba access. Convert to lba-chs
if (sector == 0) {
if ((count >= 1 << 8) || lba_high || (lba_low + count >= 1UL << 28)) {
if ((count >= 1 << 8) || lba_high || (lba_low >= ((1UL << 28) - count))) {
outb(iobase1 + ATA_CB_FR, 0x00);
outb(iobase1 + ATA_CB_SC, (count >> 8) & 0xff);
outb(iobase1 + ATA_CB_SN, lba_low >> 24);