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arch: x86_64: Write EBDA address to BIOS data area

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This allows ACPICA to find the EBDA and load the ACPI tables when
scanning for them.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-03-09 13:28:53 +00:00 committed by Sebastien Boeuf
parent cf388b160b
commit 64b32841a3
2 changed files with 11 additions and 0 deletions
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3
arch/src/x86_64/layout.rs
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@ -24,6 +24,9 @@ pub const LOW_RAM_START: GuestAddress = GuestAddress(0x0);
// == Fixed addresses within the "Low RAM" range: ==
// Location of EBDA address
pub const EBDA_POINTER: GuestAddress = GuestAddress(0x40e);
// Initial GDT/IDT needed to boot kernel
pub const BOOT_GDT_START: GuestAddress = GuestAddress(0x500);
pub const BOOT_IDT_START: GuestAddress = GuestAddress(0x520);

8
arch/src/x86_64/mod.rs
View File

@ -186,6 +186,9 @@ pub enum Error {
/// Error checking CPUID compatibility
CpuidCheckCompatibility,
// Error writing EBDA address
EbdaSetup(vm_memory::GuestMemoryError),
}
impl From<Error> for super::Error {
@ -802,6 +805,11 @@ pub fn configure_system(
rsdp_addr: Option<GuestAddress>,
sgx_epc_region: Option<SgxEpcRegion>,
) -> super::Result<()> {
// Write EBDA address to location where ACPICA expects to find it
guest_mem
.write_obj((layout::EBDA_START.0 >> 4) as u16, layout::EBDA_POINTER)
.map_err(Error::EbdaSetup)?;
let size = smbios::setup_smbios(guest_mem).map_err(Error::SmbiosSetup)?;
// Place the MP table after the SMIOS table aligned to 16 bytes