diff options
Diffstat (limited to 'Kernel/Storage/AHCIPort.cpp')
| -rw-r--r-- | Kernel/Storage/AHCIPort.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/Kernel/Storage/AHCIPort.cpp b/Kernel/Storage/AHCIPort.cpp index 70670cba3d..64638e17dd 100644 --- a/Kernel/Storage/AHCIPort.cpp +++ b/Kernel/Storage/AHCIPort.cpp @@ -536,7 +536,7 @@ bool AHCIPort::access_device(AsyncBlockDeviceRequest::RequestType direction, u64 auto* command_list_entries = (volatile AHCI::CommandHeader*)m_command_list_region->vaddr().as_ptr(); command_list_entries[unused_command_header.value()].ctba = m_command_table_pages[unused_command_header.value()].paddr().get(); command_list_entries[unused_command_header.value()].ctbau = 0; - command_list_entries[unused_command_header.value()].prdbc = (block_count * m_connected_device->block_size()); + command_list_entries[unused_command_header.value()].prdbc = 0; command_list_entries[unused_command_header.value()].prdtl = m_current_scatter_list->scatters_count(); // Note: we must set the correct Dword count in this register. Real hardware @@ -555,12 +555,20 @@ bool AHCIPort::access_device(AsyncBlockDeviceRequest::RequestType direction, u64 memset(const_cast<u8*>(command_table.command_fis), 0, 64); size_t scatter_entry_index = 0; + size_t data_transfer_count = (block_count * m_connected_device->block_size()); for (auto scatter_page : m_current_scatter_list->vmobject().physical_pages()) { + VERIFY(data_transfer_count != 0); VERIFY(scatter_page); dbgln_if(AHCI_DEBUG, "AHCI Port {}: Add a transfer scatter entry @ {}", representative_port_index(), scatter_page->paddr()); command_table.descriptors[scatter_entry_index].base_high = 0; command_table.descriptors[scatter_entry_index].base_low = scatter_page->paddr().get(); - command_table.descriptors[scatter_entry_index].byte_count = PAGE_SIZE - 1; + if (data_transfer_count <= PAGE_SIZE) { + command_table.descriptors[scatter_entry_index].byte_count = data_transfer_count - 1; + data_transfer_count = 0; + } else { + command_table.descriptors[scatter_entry_index].byte_count = PAGE_SIZE - 1; + data_transfer_count -= PAGE_SIZE; + } scatter_entry_index++; } command_table.descriptors[scatter_entry_index].byte_count = (PAGE_SIZE - 1) | (1 << 31); |