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ArmVirtPkg: VirtFdtDxe: detect fw-cfg DMA interface from the DTB 

A DMA-like transfer interface has recently been implemented in QEMU for
fw-cfg. For ARM and AARCH64 virtual machines, the binding prescribes a new
8-byte wide register at offset 0x10 in the register block. Make VirtFdtDxe
expose this register if it is present.

Please see "docs/specs/fw_cfg.txt" in the QEMU tree for more information.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18544 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Laszlo Ersek 2015-09-24 21:40:36 +00:00 committed by lersek
parent 6add86ab59
commit 50b91449a3
5 changed files with 19 additions and 0 deletions
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1
ArmVirtPkg/ArmVirtPkg.dec
View File

@ -67,6 +67,7 @@
gArmVirtTokenSpaceGuid.PcdFwCfgSelectorAddress|0x0|UINT64|0x00000004
gArmVirtTokenSpaceGuid.PcdFwCfgDataAddress|0x0|UINT64|0x00000005
gArmVirtTokenSpaceGuid.PcdFwCfgDmaAddress|0x0|UINT64|0x00000009
#
# Supported GIC revision (2, 3, ...)

1
ArmVirtPkg/ArmVirtQemu.dsc
View File

@ -199,6 +199,7 @@
gArmVirtTokenSpaceGuid.PcdFwCfgSelectorAddress|0x0
gArmVirtTokenSpaceGuid.PcdFwCfgDataAddress|0x0
gArmVirtTokenSpaceGuid.PcdFwCfgDmaAddress|0x0
#
# Set video resolution for boot options and for text setup.

1
ArmVirtPkg/ArmVirtXen.dsc
View File

@ -144,6 +144,7 @@
gArmVirtTokenSpaceGuid.PcdFwCfgSelectorAddress|0x0
gArmVirtTokenSpaceGuid.PcdFwCfgDataAddress|0x0
gArmVirtTokenSpaceGuid.PcdFwCfgDmaAddress|0x0
gArmVirtTokenSpaceGuid.PcdArmPsciMethod|0

15
ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.c
View File

@ -302,6 +302,8 @@ InitializeVirtFdtDxe (
UINT64 FwCfgSelectorSize;
UINT64 FwCfgDataAddress;
UINT64 FwCfgDataSize;
UINT64 FwCfgDmaAddress;
UINT64 FwCfgDmaSize;
Hob = GetFirstGuidHob(&gFdtHobGuid);
if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (UINT64)) {
@ -382,6 +384,19 @@ InitializeVirtFdtDxe (
DEBUG ((EFI_D_INFO, "Found FwCfg @ 0x%Lx/0x%Lx\n", FwCfgSelectorAddress,
FwCfgDataAddress));
if (fdt64_to_cpu (((UINT64 *)RegProp)[1]) >= 0x18) {
FwCfgDmaAddress = FwCfgDataAddress + 0x10;
FwCfgDmaSize = 0x08;
//
// See explanation above.
//
ASSERT (FwCfgDmaAddress <= MAX_UINTN - FwCfgDmaSize + 1);
PcdSet64 (PcdFwCfgDmaAddress, FwCfgDmaAddress);
DEBUG ((EFI_D_INFO, "Found FwCfg DMA @ 0x%Lx\n", FwCfgDmaAddress));
}
break;
case PropertyTypeVirtio:

1
ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.inf
View File

@ -53,6 +53,7 @@
gArmVirtTokenSpaceGuid.PcdArmPsciMethod
gArmVirtTokenSpaceGuid.PcdFwCfgSelectorAddress
gArmVirtTokenSpaceGuid.PcdFwCfgDataAddress
gArmVirtTokenSpaceGuid.PcdFwCfgDmaAddress
gArmVirtTokenSpaceGuid.PcdArmGicRevision
gArmTokenSpaceGuid.PcdGicDistributorBase
gArmTokenSpaceGuid.PcdGicRedistributorsBase