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docs(core): document shutdown_privileged

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Ondřej Vejpustek 2021-06-20 17:56:12 +02:00
parent 4968d7da53
commit 311288407e
1 changed files with 4 additions and 1 deletions
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core/embed/trezorhal/util.s
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@ -123,8 +123,11 @@ jump_to_unprivileged:
.global shutdown_privileged
.type shutdown_privileged, STT_FUNC
// The function must be called from the privileged mode
shutdown_privileged:
cpsid f
cpsid f // disable all exceptions (except for NMI), the instruction is ignored in unprivileged mode
// if the exceptions weren't disabled, an exception handler (for example systick handler)
// could be called after the memory is erased, which would lead to another exception
ldr r0, =0
mov r1, r0
mov r2, r0