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arch: acpi, layout: Correctly calculate and expose PCI MMCONFIG area

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The PCI MMCONFIG area must be below 4GiB and must not be part of the
device space. Shrink the device area and put the PCI MMCONFIG region
above it.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2019-09-30 14:12:36 +01:00
parent a9eb352aea
commit c0ca3b6b8e
2 changed files with 8 additions and 3 deletions
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2
arch/src/x86_64/acpi.rs
View File

@ -306,7 +306,7 @@ pub fn create_acpi_tables(
// 32-bit PCI enhanced configuration mechanism
mcfg.append(PCIRangeEntry {
base_address: layout::MEM_32BIT_DEVICES_START.0,
base_address: layout::PCI_MMCONFIG_START.0,
segment: 0,
start: 0,
end: 0xff,

9
arch/src/x86_64/layout.rs
View File

@ -69,9 +69,14 @@ pub const MEM_32BIT_RESERVED_SIZE: GuestUsize = (1024 << 20);
// == Fixed constants within the "32-bit reserved" range ==
// Sub range: 32-bit PCI devices (start: 3GiB, length: 768Mib)
// Sub range: 32-bit PCI devices (start: 3GiB, length: 640Mib)
pub const MEM_32BIT_DEVICES_START: GuestAddress = MEM_32BIT_RESERVED_START;
pub const MEM_32BIT_DEVICES_SIZE: GuestUsize = (768 << 20);
pub const MEM_32BIT_DEVICES_SIZE: GuestUsize = (640 << 20);
// PCI MMCONFIG space (start: after the device space, length: 256MiB)
pub const PCI_MMCONFIG_START: GuestAddress =
GuestAddress(MEM_32BIT_DEVICES_START.0 + MEM_32BIT_DEVICES_SIZE);
pub const PCI_MMCONFIG_SIZE: GuestUsize = (256 << 20);
// IOAPIC
pub const IOAPIC_START: GuestAddress = GuestAddress(0xfec0_0000);