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Kernel: ACHI use ext commands for LBAs >=24 bits 

AFAICS non extended commands are supposed to support 27 bit LBAs but
qemu seems to ignore bits 27:24. Maybe I'm just doing something wrong
but this seems to fix this.

This fixes using big disks :D ATM using using disks >= 8 GiB (with 512
byte LBAs) returned wrong data on reads, failing the boot :D
This commit is contained in:
Bananymous 2026-01-11 15:15:58 +02:00
parent cae2b3bd14
commit 4e3831e380
1 changed files with 4 additions and 4 deletions
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8
kernel/kernel/Storage/ATA/AHCI/Device.cpp
View File

@ -256,16 +256,16 @@ namespace Kernel
fis_command.fis_type = FIS_TYPE_REGISTER_H2D;
fis_command.c = 1;
bool need_extended = lba >= (1 << 28) || sector_count > 0xFF;
ASSERT (!need_extended || (m_command_set & ATA_COMMANDSET_LBA48_SUPPORTED));
const bool needs_extended = lba >= (1 << 24) || sector_count > 0xFF;
ASSERT (!needs_extended || (m_command_set & ATA_COMMANDSET_LBA48_SUPPORTED));
switch (command)
{
case Command::Read:
fis_command.command = need_extended ? ATA_COMMAND_READ_DMA_EXT : ATA_COMMAND_READ_DMA;
fis_command.command = needs_extended ? ATA_COMMAND_READ_DMA_EXT : ATA_COMMAND_READ_DMA;
break;
case Command::Write:
fis_command.command = need_extended ? ATA_COMMAND_WRITE_DMA_EXT : ATA_COMMAND_WRITE_DMA;
fis_command.command = needs_extended ? ATA_COMMAND_WRITE_DMA_EXT : ATA_COMMAND_WRITE_DMA;
break;
default:
ASSERT_NOT_REACHED();