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The new name and location make more sense:
- The instruction used to call into machine mode isn't called "ecall"
anymore; it's mcall now.
- Having SBI_ in the name is slightly wrong, too: these numbers are not
part of the Supervisor Binary Interface, they are just used to
forward SBI calls (they could be renumbered arbitrarily without
breaking an OS that's run under coreboot).
Also remove mcall_dev_{req,resp} and the corresponding mcall numbers,
which are no longer used.
Change-Id: I76a8cb04e4ace51964b1cb4f67d49cfee9850da7
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/18146
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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SBI calls, as it turned out, were never right.
They did not set the stack correctly on traps.
They were not correctly setting the MIP instead of the SIP
(although this was not really well documented).
On Harvey, we were trying to avoid using them,
and due to a bug in SPIKE, our avoidance worked.
Once SPIKE was fixed, our avoidance broke.
This set of changes is tested and working with Harvey
which, for the first time, is making SBI calls.
It's not pretty and we're going to want to rework
trap_util.S in coming days.
Change-Id: Ibef530adcc58d33e2c44ff758e0b7d2acbdc5e99
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/18097
Tested-by: build bot (Jenkins)
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Change-Id: Ibf471787ccb4f5393b0af737a9f7fc47b853a41a
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/17594
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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Note that currently, traps are only handled by the trap handler
installed in the bootblock. The romstage and ramstage don't override it.
TEST=Booted emulation/spike-qemu and lowrisc/nexys4ddr with a linux
payload. It worked as much as before (Linux didn't boot, but it
made some successful SBI calls)
Change-Id: Icce96ab3f41ae0f34bd86e30f9ff17c30317854e
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/17057
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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