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[efi] Install a device tree for the booted OS, if available

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If we have a device tree available (e.g. because the user has
explicitly downloaded a device tree using the "fdt" command), then
provide it to the booted operating system as an EFI configuration
table.

Since x86 does not typically use device trees, we create weak symbols
for efi_fdt_install() and efi_fdt_uninstall() to avoid dragging FDT
support into all x86 UEFI binaries.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-03-28 14:20:44 +00:00
parent 761f43ce12
commit b20f506a72
3 changed files with 127 additions and 0 deletions
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28
src/image/efi_image.c
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@@ -33,6 +33,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_image.h>
#include <ipxe/efi/efi_shim.h>
#include <ipxe/efi/efi_fdt.h>
#include <ipxe/image.h>
#include <ipxe/init.h>
#include <ipxe/features.h>
@@ -122,6 +123,24 @@ static wchar_t * efi_image_cmdline ( struct image *image ) {
return cmdline;
}
/**
* Install EFI Flattened Device Tree table (when no FDT support is present)
*
* @ret rc Return status code
*/
__weak int efi_fdt_install ( void ) {
return 0;
}
/**
* Uninstall EFI Flattened Device Tree table (when no FDT support is present)
*
* @ret rc Return status code
*/
__weak int efi_fdt_uninstall ( void ) {
return 0;
}
/**
* Execute EFI image
*
@@ -187,6 +206,13 @@ static int efi_image_exec ( struct image *image ) {
goto err_download_install;
}
/* Install Flattened Device Tree table */
if ( ( rc = efi_fdt_install() ) != 0 ) {
DBGC ( image, "EFIIMAGE %s could not install FDT: %s\n",
image->name, strerror ( rc ) );
goto err_fdt_install;
}
/* Create device path for image */
path = efi_image_path ( exec, snpdev->path );
if ( ! path ) {
@@ -313,6 +339,8 @@ static int efi_image_exec ( struct image *image ) {
err_cmdline:
free ( path );
err_image_path:
efi_fdt_uninstall();
err_fdt_install:
efi_download_uninstall ( snpdev->handle );
err_download_install:
efi_pxe_uninstall ( snpdev->handle );