TSEC: Difference between revisions
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===== Exit ===== | ===== Exit ===== | ||
The CPU automatically goes back to non-secure mode when returning back into non-secret pages. When this happens, the valid bit (bit0) in the TLB flags is cleared for all secret pages. | The CPU automatically goes back to non-secure mode when returning back into non-secret pages. When this happens, the valid bit (bit0) in the TLB flags is cleared for all secret pages. | ||
===== Implementation ===== | |||
Under certain circumstances, it is possible to observe [[#csigauth|csigauth]] being briefly written to [[#TSEC_SCP_INSN_STAT|TSEC_SCP_INSN_STAT]] as "csigauth $c4 $c6" while the opcodes in [[#TSEC_SCP_AES_STAT|TSEC_SCP_AES_STAT]] are set to "cxsin" and "csigauth", respectively. | |||
Via [[#TSEC_SCP_SEQ0_STAT|TSEC_SCP_SEQ0_STAT]] it can be observed that a 3-sized macro sequence is loaded into cs0 during a secure mode transition. | |||
== Crypto processing == | == Crypto processing == | ||