[SeaBIOS] [PATCH v2 9/9] seabios: Build the dsdt separately

Kevin O'Connor kevin at koconnor.net
Wed Oct 10 02:04:12 CEST 2012

On Mon, Oct 08, 2012 at 11:35:15PM -0400, Jason Baron wrote:
> From: Jason Baron <jbaron at redhat.com>
> This builds seabios such that the dsdt tables are no longer built into the
> seabios binary. They must be passed to the seabios via fw_cfg. This saves
> space in the seabios binary for unnecessary dsdt tables.
> I suspect that this will make other users of Seabios, besides qemu unhappy,
> but I'm not sure.

Only qemu/kvm uses the acpi support in seabios.  (If one excludes
bochs which hasn't really used seabios.)  Coreboot and Xen both deploy
acpi completely separately from seabios.

Instead of moving just the dsdt to qemu, though, can we move all acpi
tables into qemu?  Moving just the dsdt can lead to conflicts with the
generated ssdt code and potentially some of the other acpi tables.

The only seabios acpi dependency that pops into mind is the memory
addresses of the acpi tables themselves.  It should be trivial to have
seabios create the rsdt/rsdp while pulling all the remaining acpi
tables from qemu via fw_cfg.  Almost all the tables in acpi describe
hardware and not the firmware.  Are there other cases where the
firmware needs to have input when generating the contents of an acpi


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