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hw/arm/bcm2835_property: Implement "get command line" message
This query copies the kernel command line into the message buffer. It was previously stubbed out to return empty, this commit makes it reflect the arguments specified with `-append`. I observed the following peculiarities on my Pi 3B+: - If the buffer is shorter than the string, the response header gives the full length, but no data is actually copied. - No NUL terminator is added: even if the buffer is long enough to fit one, the buffer's original contents are preserved past the string's end. - The VC firmware adds the following extra parameters beside the user-supplied ones (via /boot/cmdline.txt): `video`, `vc_mem.mem_base` and `vc_mem.mem_size`. This is currently not implemented in qemu. Signed-off-by: Daniel Bertalan <dani@danielbertalan.dev> Message-id: 20230425103250.56653-1-dani@danielbertalan.dev Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [PMM: added comment about NUL and short-buffer behaviour] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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