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[efi] Add the "snpnet" driver

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Add a new network driver that consumes the EFI Simple Network
Protocol.  Also add a bus driver that can find the Simple Network
Protocol that iPXE was loaded from; the resulting behavior is similar
to the "undionly" driver for BIOS systems.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Geoff Lywood
2010-05-27 20:08:28 -07:00
committed by Michael Brown
parent 74bc1b95bb
commit 62149deb11
10 changed files with 724 additions and 4 deletions
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37
src/image/efi_image.c
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@@ -21,12 +21,27 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <errno.h>
#include <ipxe/efi/efi.h>
#include <ipxe/image.h>
#include <ipxe/init.h>
#include <ipxe/features.h>
FEATURE ( FEATURE_IMAGE, "EFI", DHCP_EB_FEATURE_EFI, 1 );
struct image_type efi_image_type __image_type ( PROBE_NORMAL );
/** Event used to signal shutdown */
static EFI_EVENT efi_shutdown_event;
/**
* Shut down in preparation for booting an OS.
*
* This hook gets called at ExitBootServices time in order to make sure that
* the network cards are properly shut down before the OS takes over.
*/
static EFIAPI void efi_shutdown_hook ( EFI_EVENT event __unused,
void *context __unused ) {
shutdown ( SHUTDOWN_BOOT );
}
/**
* Execute EFI image
*
@@ -39,6 +54,7 @@ static int efi_image_exec ( struct image *image ) {
UINTN exit_data_size;
CHAR16 *exit_data;
EFI_STATUS efirc;
int rc;
/* Attempt loading image */
if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, NULL,
@@ -50,21 +66,36 @@ static int efi_image_exec ( struct image *image ) {
return -ENOEXEC;
}
/* Be sure to shut down the NIC at ExitBootServices time, or else
* DMA from the card can corrupt the OS.
*/
efirc = bs->CreateEvent ( EVT_SIGNAL_EXIT_BOOT_SERVICES,
TPL_CALLBACK, efi_shutdown_hook,
NULL, &efi_shutdown_event );
if ( efirc ) {
rc = EFIRC_TO_RC ( efirc );
goto done;
}
/* Start the image */
if ( ( efirc = bs->StartImage ( handle, &exit_data_size,
&exit_data ) ) != 0 ) {
DBGC ( image, "EFIIMAGE %p returned with status %s\n",
image, efi_strerror ( efirc ) );
goto done;
}
done:
rc = EFIRC_TO_RC ( efirc );
/* Remove the shutdown hook */
bs->CloseEvent ( efi_shutdown_event );
done:
/* Unload the image. We can't leave it loaded, because we
* have no "unload" operation.
*/
bs->UnloadImage ( handle );
return EFIRC_TO_RC ( efirc );
return rc;
}
/**