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Added explanatory comment.
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* which assemble a file into a single contiguous block. The whole
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* block is then passed to the image loader.
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*
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*
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* Note that the rather convoluted way of manipulating the buffer
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* descriptors (using copy_{to,from}_phys rather than straightforward
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* pointers) is needed to cope with operation as a PXE stack, when we
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* may be running in real mode or 16-bit protected mode, and therefore
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* cannot directly access arbitrary areas of memory.
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*
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*/
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#include "stddef.h"
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