Normally, DXE driver would add device resource to GCD before start using.
But some key resources such as uart used for printing info at very early
stage.
Those resources should be populated to HOB in SEC phase so they are
added to GCD before MMU enabled.
Signed-off-by: Tuan Phan <tp...@ventanamicro.com>
Reviewed-by: Andrei Warkentin <andrei.warken...@intel.com>
---
OvmfPkg/RiscVVirt/Sec/Platform.c | 62 ++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/OvmfPkg/RiscVVirt/Sec/Platform.c b/OvmfPkg/RiscVVirt/Sec/Platform.c
index 3645c27b0b12..c66432473067 100644
--- a/OvmfPkg/RiscVVirt/Sec/Platform.c
+++ b/OvmfPkg/RiscVVirt/Sec/Platform.c
@@ -21,6 +21,64 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include <libfdt.h>
#include <Guid/FdtHob.h>
+/**
+ Build memory map I/O range resource HOB using the
+ base address and size.
+
+ @param MemoryBase Memory map I/O base.
+ @param MemorySize Memory map I/O size.
+
+**/
+STATIC
+VOID
+AddIoMemoryBaseSizeHob (
+ EFI_PHYSICAL_ADDRESS MemoryBase,
+ UINT64 MemorySize
+ )
+{
+ /* Align to EFI_PAGE_SIZE */
+ MemorySize = ALIGN_VALUE (MemorySize, EFI_PAGE_SIZE);
+ BuildResourceDescriptorHob (
+ EFI_RESOURCE_MEMORY_MAPPED_IO,
+ EFI_RESOURCE_ATTRIBUTE_PRESENT |
+ EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
+ EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
+ EFI_RESOURCE_ATTRIBUTE_TESTED,
+ MemoryBase,
+ MemorySize
+ );
+}
+
+/**
+ Populate IO resources from FDT that not added to GCD by its
+ driver in the DXE phase.
+
+ @param FdtBase Fdt base address
+ @param Compatible Compatible string
+
+**/
+STATIC
+VOID
+PopulateIoResources (
+ VOID *FdtBase,
+ CONST CHAR8 *Compatible
+ )
+{
+ UINT64 *Reg;
+ INT32 Node, LenP;
+
+ Node = fdt_node_offset_by_compatible (FdtBase, -1, Compatible);
+ while (Node != -FDT_ERR_NOTFOUND) {
+ Reg = (UINT64 *)fdt_getprop (FdtBase, Node, "reg", &LenP);
+ if (Reg) {
+ ASSERT (LenP == (2 * sizeof (UINT64)));
+ AddIoMemoryBaseSizeHob (SwapBytes64 (Reg[0]), SwapBytes64 (Reg[1]));
+ }
+
+ Node = fdt_node_offset_by_compatible (FdtBase, Node, Compatible);
+ }
+}
+
/**
@retval EFI_SUCCESS The address of FDT is passed in HOB.
EFI_UNSUPPORTED Can't locate FDT.
@@ -80,5 +138,9 @@ PlatformPeimInitialization (
BuildFvHob (PcdGet32 (PcdOvmfDxeMemFvBase), PcdGet32 (PcdOvmfDxeMemFvSize));
+ PopulateIoResources (Base, "ns16550a");
+ PopulateIoResources (Base, "qemu,fw-cfg-mmio");
+ PopulateIoResources (Base, "virtio,mmio");
+
return EFI_SUCCESS;
}
--
2.25.1
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