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https://github.com/RGBCube/serenity
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Kernel: Use IDE LBA addressing instead of the long-obsolete C/H/S.
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parent
62f7e8ac62
commit
11e7ce60e5
2 changed files with 14 additions and 34 deletions
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@ -165,17 +165,9 @@ void IDEDiskDevice::initialize()
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);
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}
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IDEDiskDevice::CHS IDEDiskDevice::lba_to_chs(dword lba) const
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{
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CHS chs;
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chs.cylinder = lba / (m_sectors_per_track * m_heads);
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chs.head = (lba / m_sectors_per_track) % m_heads;
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chs.sector = (lba % m_sectors_per_track) + 1;
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return chs;
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}
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bool IDEDiskDevice::read_sectors(dword start_sector, word count, byte* outbuf)
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{
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ASSERT(count <= 256);
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LOCKER(m_lock);
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#ifdef DISK_DEBUG
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dbgprintf("%s: Disk::read_sectors request (%u sector(s) @ %u)\n",
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@ -185,20 +177,17 @@ bool IDEDiskDevice::read_sectors(dword start_sector, word count, byte* outbuf)
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#endif
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disable_irq();
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auto chs = lba_to_chs(start_sector);
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while (IO::in8(IDE0_STATUS) & BUSY);
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#ifdef DISK_DEBUG
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kprintf("IDEDiskDevice: Reading %u sector(s) @ LBA %u (%u/%u/%u)\n", count, start_sector, chs.cylinder, chs.head, chs.sector);
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kprintf("IDEDiskDevice: Reading %u sector(s) @ LBA %u\n", count, start_sector);
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#endif
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IO::out8(0x1F2, count == 256 ? 0 : LSB(count));
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IO::out8(0x1F3, chs.sector);
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IO::out8(0x1F4, LSB(chs.cylinder));
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IO::out8(0x1F5, MSB(chs.cylinder));
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IO::out8(0x1F6, 0xA0 | chs.head); /* 0xB0 for 2nd device */
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IO::out8(0x1f2, count == 256 ? 0 : LSB(count));
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IO::out8(0x1f3, start_sector & 0xff);
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IO::out8(0x1f4, (start_sector >> 8) & 0xff);
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IO::out8(0x1f5, (start_sector >> 16) & 0xff);
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IO::out8(0x1f6, 0xe0 | ((start_sector >> 24) & 0xf)); // 0xf0 for 2nd device
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IO::out8(0x3F6, 0x08);
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while (!(IO::in8(IDE0_STATUS) & DRDY));
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@ -228,6 +217,7 @@ bool IDEDiskDevice::read_sectors(dword start_sector, word count, byte* outbuf)
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bool IDEDiskDevice::write_sectors(dword start_sector, word count, const byte* data)
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{
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ASSERT(count <= 256);
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LOCKER(m_lock);
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#ifdef DISK_DEBUG
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dbgprintf("%s(%u): IDEDiskDevice::write_sectors request (%u sector(s) @ %u)\n",
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@ -238,18 +228,15 @@ bool IDEDiskDevice::write_sectors(dword start_sector, word count, const byte* da
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#endif
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disable_irq();
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auto chs = lba_to_chs(start_sector);
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while (IO::in8(IDE0_STATUS) & BUSY);
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//dbgprintf("IDEDiskDevice: Writing %u sector(s) @ LBA %u (%u/%u/%u)\n", count, start_sector, chs.cylinder, chs.head, chs.sector);
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//dbgprintf("IDEDiskDevice: Writing %u sector(s) @ LBA %u\n", count, start_sector);
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IO::out8(0x1F2, count == 256 ? 0 : LSB(count));
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IO::out8(0x1F3, chs.sector);
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IO::out8(0x1F4, LSB(chs.cylinder));
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IO::out8(0x1F5, MSB(chs.cylinder));
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IO::out8(0x1F6, 0xA0 | chs.head); /* 0xB0 for 2nd device */
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IO::out8(0x1f2, count == 256 ? 0 : LSB(count));
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IO::out8(0x1f3, start_sector & 0xff);
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IO::out8(0x1f4, (start_sector >> 8) & 0xff);
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IO::out8(0x1f5, (start_sector >> 16) & 0xff);
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IO::out8(0x1f6, 0xe0 | ((start_sector >> 24) & 0xf)); // 0xf0 for 2nd device
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IO::out8(0x3F6, 0x08);
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