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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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