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Kernel/PCI + CPU: Allow to access unaligned data
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parent
543c29377b
commit
210754a93a
3 changed files with 62 additions and 8 deletions
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@ -195,6 +195,50 @@ public:
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class GenericInterruptHandler;
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struct RegisterState;
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template<typename T>
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void read_possibly_unaligned_data(u8* where, T& data)
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{
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// FIXME: Implement 64 bit unaligned data access
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VERIFY(sizeof(T) == 8 || sizeof(T) == 4 || sizeof(T) == 2);
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if (((FlatPtr)where % sizeof(T)) == 0) {
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data = *(T*)where;
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return;
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}
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if (sizeof(T) == 2) {
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data = *(u8*)where | ((u16)(*(where + 1)) << 8);
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return;
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}
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if (sizeof(T) == 4) {
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data = *(u8*)where | (((u32) * (where + 1)) << 8) | (((u32) * (where + 2)) << 16) | (((u32) * (u8*)(where + 3)) << 24);
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return;
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}
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VERIFY_NOT_REACHED();
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}
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template<typename T>
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void write_possibly_unaligned_data(u8* where, T data)
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{
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// FIXME: Implement 64 bit unaligned data access
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VERIFY(sizeof(T) == 8 || sizeof(T) == 4 || sizeof(T) == 2);
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if (((FlatPtr)where % sizeof(T)) == 0) {
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*(T*)where = data;
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return;
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}
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if (sizeof(T) == 2) {
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where[0] = (u8)(data & 0xFF);
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where[1] = (u8)((data >> 8) & 0xFF);
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return;
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}
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if (sizeof(T) == 4) {
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where[0] = (u8)(data & 0xFF);
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where[1] = (u8)((data >> 8) & 0xFF);
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where[2] = (u8)((data >> 16) & 0xFF);
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where[3] = (u8)((data >> 24) & 0xFF);
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return;
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}
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VERIFY_NOT_REACHED();
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}
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const DescriptorTablePointer& get_gdtr();
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const DescriptorTablePointer& get_idtr();
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void register_interrupt_handler(u8 number, void (*handler)());
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@ -26,6 +26,7 @@
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#include <Kernel/Arch/x86/CPU.h>
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#include <Kernel/Debug.h>
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#include <Kernel/PCI/MMIOAccess.h>
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#include <Kernel/VM/MemoryManager.h>
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@ -142,7 +143,9 @@ u16 MMIOAccess::read16_field(Address address, u32 field)
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ScopedSpinLock lock(m_access_lock);
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VERIFY(field < 0xfff);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Reading 16-bit field {:#08x} for {}", field, address);
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return *((volatile u16*)(get_device_configuration_space(address).get() + (field & 0xfff)));
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u16 data = 0;
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read_possibly_unaligned_data<u16>(get_device_configuration_space(address).offset(field & 0xfff).as_ptr(), data);
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return data;
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}
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u32 MMIOAccess::read32_field(Address address, u32 field)
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@ -150,7 +153,9 @@ u32 MMIOAccess::read32_field(Address address, u32 field)
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ScopedSpinLock lock(m_access_lock);
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VERIFY(field <= 0xffc);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Reading 32-bit field {:#08x} for {}", field, address);
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return *((volatile u32*)(get_device_configuration_space(address).get() + (field & 0xfff)));
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u32 data = 0;
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read_possibly_unaligned_data<u32>(get_device_configuration_space(address).offset(field & 0xfff).as_ptr(), data);
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return data;
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}
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void MMIOAccess::write8_field(Address address, u32 field, u8 value)
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@ -165,14 +170,14 @@ void MMIOAccess::write16_field(Address address, u32 field, u16 value)
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ScopedSpinLock lock(m_access_lock);
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VERIFY(field < 0xfff);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Writing 16-bit field {:#08x}, value={:#02x} for {}", field, value, address);
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*((volatile u16*)(get_device_configuration_space(address).get() + (field & 0xfff))) = value;
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write_possibly_unaligned_data<u16>(get_device_configuration_space(address).offset(field & 0xfff).as_ptr(), value);
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}
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void MMIOAccess::write32_field(Address address, u32 field, u32 value)
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{
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ScopedSpinLock lock(m_access_lock);
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VERIFY(field <= 0xffc);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Writing 32-bit field {:#08x}, value={:#02x} for {}", field, value, address);
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*((volatile u32*)(get_device_configuration_space(address).get() + (field & 0xfff))) = value;
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write_possibly_unaligned_data<u32>(get_device_configuration_space(address).offset(field & 0xfff).as_ptr(), value);
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}
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void MMIOAccess::enumerate_hardware(Function<void(Address, ID)> callback)
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@ -26,6 +26,7 @@
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#include <Kernel/Arch/x86/CPU.h>
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#include <Kernel/Debug.h>
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#include <Kernel/PCI/WindowedMMIOAccess.h>
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#include <Kernel/VM/MemoryManager.h>
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@ -96,7 +97,9 @@ u16 WindowedMMIOAccess::read16_field(Address address, u32 field)
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InterruptDisabler disabler;
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VERIFY(field < 0xfff);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Reading 16-bit field {:#08x} for {}", field, address);
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return *((u16*)(get_device_configuration_space(address).value().get() + (field & 0xfff)));
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u16 data = 0;
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read_possibly_unaligned_data<u16>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), data);
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return data;
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}
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u32 WindowedMMIOAccess::read32_field(Address address, u32 field)
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@ -104,7 +107,9 @@ u32 WindowedMMIOAccess::read32_field(Address address, u32 field)
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InterruptDisabler disabler;
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VERIFY(field <= 0xffc);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Reading 32-bit field {:#08x} for {}", field, address);
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return *((u32*)(get_device_configuration_space(address).value().get() + (field & 0xfff)));
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u32 data = 0;
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read_possibly_unaligned_data<u32>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), data);
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return data;
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}
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void WindowedMMIOAccess::write8_field(Address address, u32 field, u8 value)
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@ -119,14 +124,14 @@ void WindowedMMIOAccess::write16_field(Address address, u32 field, u16 value)
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InterruptDisabler disabler;
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VERIFY(field < 0xfff);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Writing 16-bit field {:#08x}, value={:#02x} for {}", field, value, address);
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*((u16*)(get_device_configuration_space(address).value().get() + (field & 0xfff))) = value;
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write_possibly_unaligned_data<u16>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), value);
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}
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void WindowedMMIOAccess::write32_field(Address address, u32 field, u32 value)
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{
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InterruptDisabler disabler;
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VERIFY(field <= 0xffc);
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dbgln_if(PCI_DEBUG, "PCI: MMIO Writing 32-bit field {:#08x}, value={:#02x} for {}", field, value, address);
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*((u32*)(get_device_configuration_space(address).value().get() + (field & 0xfff))) = value;
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write_possibly_unaligned_data<u32>(get_device_configuration_space(address).value().offset(field & 0xfff).as_ptr(), value);
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}
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}
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