Add an initial platform DXE driver and support for ramdisk devices.

Signed-off-by: Deepak Pandey <Deepak.Pandey@arm.com>
Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@arm.com>
---
 Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf | 44 +++++++++++++++++
 Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c   | 51 ++++++++++++++++++++
 2 files changed, 95 insertions(+)

diff --git a/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf
new file mode 100644
index 000000000000..925bde4063cc
--- /dev/null
+++ b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf
@@ -0,0 +1,44 @@
+## @file
+#  Platform DXE driver for N1Sdp
+#
+#  Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = PlatformDxe
+  FILE_GUID                      = 11fc8b5a-377d-47a8-aee9-0093d3d3407f
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = ArmN1SdpEntryPoint
+
+[Sources.common]
+  PlatformDxe.c
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  ArmPlatformPkg/ArmPlatformPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  Platform/ARM/N1Sdp/N1SdpPlatform.dec
+
+[LibraryClasses]
+  HobLib
+  UefiDriverEntryPoint
+
+[Protocols]
+  gEfiRamDiskProtocolGuid
+
+[FeaturePcd]
+  gArmN1SdpTokenSpaceGuid.PcdRamDiskSupported
+
+[FixedPcd]
+  gArmN1SdpTokenSpaceGuid.PcdRamDiskBase
+  gArmN1SdpTokenSpaceGuid.PcdRamDiskSize
+
+[Depex]
+  gEfiRamDiskProtocolGuid
diff --git a/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c
new file mode 100644
index 000000000000..e0b89556d40d
--- /dev/null
+++ b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c
@@ -0,0 +1,51 @@
+/** @file
+
+  Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/DebugLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Protocol/RamDisk.h>
+
+/**
+  Entrypoint of Platform Dxe Driver
+
+  @param  ImageHandle[in]       The firmware allocated handle for the EFI image.
+  @param  SystemTable[in]       A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS           The entry point is executed successfully.
+**/
+EFI_STATUS
+EFIAPI
+ArmN1SdpEntryPoint (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  )
+{
+  EFI_STATUS                 Status;
+  EFI_RAM_DISK_PROTOCOL      *RamDisk;
+  EFI_DEVICE_PATH_PROTOCOL   *DevicePath;
+
+  Status = EFI_UNSUPPORTED;
+  if (FeaturePcdGet (PcdRamDiskSupported)) {
+    Status = gBS->LocateProtocol (&gEfiRamDiskProtocolGuid, NULL, (VOID**) &RamDisk);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: Couldn't find the RAM Disk protocol - %r\n", __FUNCTION__, Status));
+      return Status;
+    }
+
+    Status = RamDisk->Register (
+               (UINTN)PcdGet32(PcdRamDiskBase),
+               (UINTN)PcdGet32(PcdRamDiskSize),
+               &gEfiVirtualCdGuid,
+               NULL,
+               &DevicePath);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: Failed to register RAM Disk - %r\n", __FUNCTION__, Status));
+    }
+  }
+  return Status;
+}
-- 
2.17.1



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Hi Khasim,

I can see that some changes to the PlatformDxe are in the last patch of
this series.  Do they belong here?

Other than that, please find my response inline marked [SAMI].

Regards,

Sami Mujawar


On 02/06/2021 01:46 PM, Khasim Mohammed via groups.io wrote:
> Add an initial platform DXE driver and support for ramdisk devices.
>
> Signed-off-by: Deepak Pandey <Deepak.Pandey@arm.com>
> Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@arm.com>
> ---
>   Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf | 44 +++++++++++++++++
>   Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c   | 51 ++++++++++++++++++++
>   2 files changed, 95 insertions(+)
>
> diff --git a/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf
> new file mode 100644
> index 000000000000..925bde4063cc
> --- /dev/null
> +++ b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.inf
> @@ -0,0 +1,44 @@
> +## @file
> +#  Platform DXE driver for N1Sdp
> +#
> +#  Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
> +#
> +#  SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> +  INF_VERSION                    = 0x0001001B
> +  BASE_NAME                      = PlatformDxe
> +  FILE_GUID                      = 11fc8b5a-377d-47a8-aee9-0093d3d3407f
> +  MODULE_TYPE                    = DXE_DRIVER
> +  VERSION_STRING                 = 1.0
> +  ENTRY_POINT                    = ArmN1SdpEntryPoint
> +
> +[Sources.common]
> +  PlatformDxe.c
> +
> +[Packages]
> +  ArmPkg/ArmPkg.dec
> +  ArmPlatformPkg/ArmPlatformPkg.dec
> +  EmbeddedPkg/EmbeddedPkg.dec
> +  MdeModulePkg/MdeModulePkg.dec
> +  MdePkg/MdePkg.dec
> +  Platform/ARM/N1Sdp/N1SdpPlatform.dec
> +
> +[LibraryClasses]
> +  HobLib
> +  UefiDriverEntryPoint
> +
> +[Protocols]
> +  gEfiRamDiskProtocolGuid
> +
> +[FeaturePcd]
> +  gArmN1SdpTokenSpaceGuid.PcdRamDiskSupported
> +
> +[FixedPcd]
> +  gArmN1SdpTokenSpaceGuid.PcdRamDiskBase
> +  gArmN1SdpTokenSpaceGuid.PcdRamDiskSize
> +
> +[Depex]
> +  gEfiRamDiskProtocolGuid
> diff --git a/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c
> new file mode 100644
> index 000000000000..e0b89556d40d
> --- /dev/null
> +++ b/Platform/ARM/N1Sdp/Drivers/PlatformDxe/PlatformDxe.c
> @@ -0,0 +1,51 @@
> +/** @file
> +
> +  Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
> +
> +  SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Library/DebugLib.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +#include <Protocol/RamDisk.h>
> +
> +/**
> +  Entrypoint of Platform Dxe Driver
> +
> +  @param  ImageHandle[in]       The firmware allocated handle for the EFI image.
> +  @param  SystemTable[in]       A pointer to the EFI System Table.
> +
> +  @retval EFI_SUCCESS           The entry point is executed successfully.
> +**/
> +EFI_STATUS
> +EFIAPI
> +ArmN1SdpEntryPoint (
> +  IN EFI_HANDLE         ImageHandle,
> +  IN EFI_SYSTEM_TABLE   *SystemTable
> +  )
> +{
> +  EFI_STATUS                 Status;
> +  EFI_RAM_DISK_PROTOCOL      *RamDisk;
> +  EFI_DEVICE_PATH_PROTOCOL   *DevicePath;
> +
> +  Status = EFI_UNSUPPORTED;
> +  if (FeaturePcdGet (PcdRamDiskSupported)) {
> +    Status = gBS->LocateProtocol (&gEfiRamDiskProtocolGuid, NULL, (VOID**) &RamDisk);
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "%a: Couldn't find the RAM Disk protocol - %r\n", __FUNCTION__, Status));
> +      return Status;
> +    }
> +
> +    Status = RamDisk->Register (
> +               (UINTN)PcdGet32(PcdRamDiskBase),
> +               (UINTN)PcdGet32(PcdRamDiskSize),
[SAMI] Space needed between PcdGet32 and opening bracket. Please check
at other places in this patch series.
> +               &gEfiVirtualCdGuid,
> +               NULL,
> +               &DevicePath);
> +    if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "%a: Failed to register RAM Disk - %r\n", __FUNCTION__, Status));
> +    }
> +  }
> +  return Status;
> +}

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