This page needs some love from people who know how it actually works :(
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The IPC commands are written to the Thread Local Storage, at offset 0x80. Every IPC command sent to services starts with a u32 header code, and parameters, if any, are written after this header. If the kernel was able to dispatch the request, the server reply will be written to TLS+0x80. Often the first word of the response data is the error code (or 0 if success).
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IPC commands are written to the [[Thread Local Storage]] at offset 0x80 and submitted using [[SVC|svcSendSyncRequest]]. If the kernel was able to dispatch the request, the server reply will be written to TLS+0x80. Often the first word of the response data is the error code (or 0 if success).
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The command header is a 32-bit integer that can be decompossed in the following parts:
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Every IPC command sent to services starts with a u32 header code, and parameters, if any, are written after this header. The can be decomposed in the following parts: