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d899fdaaee
Previously, you could use EC_CMD_ACPI_QUERY_EVENT to read events that
were masked off (that is, events which would not generate SCI/SMI/wake
signals). The handlers for those signals on the host would still act
on the masked-off events - for example, causing unwanted power button
keypresses/releases.
Now, EC_CMD_ACPI_QUERY_EVENT will only return events which are unmasked.
This does not affect storing of events at event generation time.
Events are still queued; they won't be dropped until the host attempts
to read the next event. This gives the host a chance to set a mask
later in boot (but before querying any events) to capture events which
happened early in the boot process.
BUG=chrome-os-partner:26574
BRANCH=rambi
TEST=At EC console, type 'hostevent set 0x80' but don't press enter.
Hold down the power button; UI starts fading to white.
Press enter at the EC console to issue the hostevent command.
System should continue shutting down, not fade back as if the
power button were released.
Change-Id: Id2cb14b0979f49cdd42424b9a61b310a2bb506f5
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/194935
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
In the most general case, the flash layout looks something like this: +---------------------+ | Reserved for EC use | +---------------------+ +---------------------+ | Vblock B | +---------------------+ | RW firmware B | +---------------------+ +---------------------+ | Vblock A | +---------------------+ | RW firmware A | +---------------------+ +---------------------+ | FMAP | +---------------------+ | Public root key | +---------------------+ | Read-only firmware | +---------------------+ BIOS firmware (and kernel) put the vblock info at the start of each image where it's easy to find. The Blizzard EC expects the firmware vector table to come first, so we have to put the vblock at the end. This means we have to know where to look for it, but that's built into the FMAP and the RO firmware anyway, so that's not an issue. The RO firmware doesn't need a vblock of course, but it does need some reserved space for vboot-related things. Using SHA256/RSA4096, the vblock is 2468 bytes (0x9a4), while the public root key is 1064 bytes (0x428) and the current FMAP is 644 bytes (0x284). If we reserve 4K at the top of each FW image, that should give us plenty of room for vboot-related stuff.