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audk/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlashDxe.c

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OvmfPkg: QemuFlashFvbServicesRuntimeDxe: split out runtime DXE specifics In preparation for introducing an SMM interface to this driver, move the following traits to separate files, so that we can replace them in the new SMM INF file: - Protocol installations. The SMM driver will install protocol interfaces in the SMM protocol database, using SMM services. - Virtual address change handler and pointer conversions. SMM drivers run with physical mappings and pointers must not be converted. There are further restrictions and changes for an SMM driver, but the rest of the code either complies with those already, or will handle the changes transparently. For example: - SMM drivers have access to both UEFI and SMM protocols in their entry points (see the PI spec 1.4, "1.7 SMM Driver Initialization"), - MemoryAllocationLib has an SMM instance that serves allocation requests with the gSmst->SmmAllocatePool() service transparently, allocating runtime-marked SMRAM. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18671 6f19259b-4bc3-4df7-8a09-765794883524
2015-10-26 15:58:39 +01:00
/** @file
OVMF support for QEMU system firmware flash device: functions specific to the
runtime DXE driver build.
Copyright (C) 2015, Red Hat, Inc.
Copyright (c) 2009 - 2013, Intel Corporation. All rights reserved.<BR>
OvmfPkg: Replace BSD License with BSD+Patent License https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2019-04-04 01:06:33 +02:00
SPDX-License-Identifier: BSD-2-Clause-Patent
OvmfPkg: QemuFlashFvbServicesRuntimeDxe: split out runtime DXE specifics In preparation for introducing an SMM interface to this driver, move the following traits to separate files, so that we can replace them in the new SMM INF file: - Protocol installations. The SMM driver will install protocol interfaces in the SMM protocol database, using SMM services. - Virtual address change handler and pointer conversions. SMM drivers run with physical mappings and pointers must not be converted. There are further restrictions and changes for an SMM driver, but the rest of the code either complies with those already, or will handle the changes transparently. For example: - SMM drivers have access to both UEFI and SMM protocols in their entry points (see the PI spec 1.4, "1.7 SMM Driver Initialization"), - MemoryAllocationLib has an SMM instance that serves allocation requests with the gSmst->SmmAllocatePool() service transparently, allocating runtime-marked SMRAM. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18671 6f19259b-4bc3-4df7-8a09-765794883524
2015-10-26 15:58:39 +01:00
**/
#include <Library/UefiRuntimeLib.h>
#include "QemuFlash.h"
VOID
QemuFlashConvertPointers (
VOID
)
{
EfiConvertPointer (0x0, (VOID **) &mFlashBase);
}
OvmfPkg/QemuFlashFvbServicesRuntimeDxe: Clear C-bit when SEV is active Commit:24e4ad7 (OvmfPkg: Add AmdSevDxe driver) added a driver which runs early in DXE phase and clears the C-bit from NonExistent entry -- which is later split and accommodate the flash MMIO. When SMM is enabled, we build two sets of page tables; first page table is used when executing code in non SMM mode (SMM-less-pgtable) and second page table is used when we are executing code in SMM mode (SMM-pgtable). During boot time, AmdSevDxe driver clears the C-bit from the SMM-less-pgtable. But when SMM is enabled, Qemu Flash services are used from SMM mode. In this patch we explicitly clear the C-bit from Qemu flash MMIO range before we probe the flash. When OVMF is built with SMM_REQUIRE then call to initialize the flash services happen after the SMM-pgtable is created and processor has served the first SMI. At this time we will have access to the SMM-pgtable. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> [lersek@redhat.com: trivial coding style improvements] Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2018-03-09 17:06:03 +01:00
VOID
QemuFlashBeforeProbe (
IN EFI_PHYSICAL_ADDRESS BaseAddress,
IN UINTN FdBlockSize,
IN UINTN FdBlockCount
)
{
//
// Do nothing
//
}