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Other functions, such as loading the Global Descriptor Table (on the IA32 architecture), also require special opcodes which are not available within C language (but can be implemented in InlineAssembly). In the (unlikely) case your compiler does not support inline Assembly, you have the option of writing 'support functions' in a separate assembly file. Note that we have a page with SampleInlineFunctions for basic operations using GCC.
[[Interrupt Service Routines]] (ISRs) also require some special handling, because they are called directly by the CPU, not by the C environment.
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