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Kernel/PCI + CPU: Allow to access unaligned data

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Liav A 2021-04-04 22:13:20 +03:00 • committed by Andreas Kling
parent 543c29377b
commit 210754a93a
3 changed files with 62 additions and 8 deletions
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13
Kernel/PCI/WindowedMMIOAccess.cpp
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@ -26,6 +26,7 @@
#include <AK/Optional.h>
#include <AK/StringView.h>
#include <Kernel/Arch/x86/CPU.h>
#include <Kernel/Debug.h>
#include <Kernel/PCI/WindowedMMIOAccess.h>
#include <Kernel/VM/MemoryManager.h>
@ -96,7 +97,9 @@ u16 WindowedMMIOAccess::read16_field(Address address, u32 field)
InterruptDisabler disabler;
VERIFY(field < 0xfff);
dbgln_if(PCI_DEBUG, "PCI: MMIO Reading 16-bit field {:#08x} for {}", field, address);
return *((u16*)(get_device_configuration_space(address).value().get() + (field & 0xfff)));
u16 data = 0;
read_possibly_unaligned_data<u16>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), data);
return data;
}
u32 WindowedMMIOAccess::read32_field(Address address, u32 field)
@ -104,7 +107,9 @@ u32 WindowedMMIOAccess::read32_field(Address address, u32 field)
InterruptDisabler disabler;
VERIFY(field <= 0xffc);
dbgln_if(PCI_DEBUG, "PCI: MMIO Reading 32-bit field {:#08x} for {}", field, address);
return *((u32*)(get_device_configuration_space(address).value().get() + (field & 0xfff)));
u32 data = 0;
read_possibly_unaligned_data<u32>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), data);
return data;
}
void WindowedMMIOAccess::write8_field(Address address, u32 field, u8 value)
@ -119,14 +124,14 @@ void WindowedMMIOAccess::write16_field(Address address, u32 field, u16 value)
InterruptDisabler disabler;
VERIFY(field < 0xfff);
dbgln_if(PCI_DEBUG, "PCI: MMIO Writing 16-bit field {:#08x}, value={:#02x} for {}", field, value, address);
*((u16*)(get_device_configuration_space(address).value().get() + (field & 0xfff))) = value;
write_possibly_unaligned_data<u16>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), value);
}
void WindowedMMIOAccess::write32_field(Address address, u32 field, u32 value)
{
InterruptDisabler disabler;
VERIFY(field <= 0xffc);
dbgln_if(PCI_DEBUG, "PCI: MMIO Writing 32-bit field {:#08x}, value={:#02x} for {}", field, value, address);
*((u32*)(get_device_configuration_space(address).value().get() + (field & 0xfff))) = value;
write_possibly_unaligned_data<u32>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), value);
}
}