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[efi] Provide efi_uri_path() to construct a URI device path

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2020-10-16 15:09:15 +01:00
parent 1e8648f611
commit f2c826179a
2 changed files with 45 additions and 0 deletions
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2
src/include/ipxe/efi/efi_path.h
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@@ -13,11 +13,13 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/efi/efi.h> #include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/DevicePath.h> #include <ipxe/efi/Protocol/DevicePath.h>
struct uri;
struct usb_function; struct usb_function;
extern EFI_DEVICE_PATH_PROTOCOL * extern EFI_DEVICE_PATH_PROTOCOL *
efi_path_end ( EFI_DEVICE_PATH_PROTOCOL *path ); efi_path_end ( EFI_DEVICE_PATH_PROTOCOL *path );
extern size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path ); extern size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path );
extern EFI_DEVICE_PATH_PROTOCOL * efi_uri_path ( struct uri *uri );
extern EFI_DEVICE_PATH_PROTOCOL * efi_usb_path ( struct usb_function *func ); extern EFI_DEVICE_PATH_PROTOCOL * efi_usb_path ( struct usb_function *func );
extern EFI_DEVICE_PATH_PROTOCOL * efi_describe ( struct interface *interface ); extern EFI_DEVICE_PATH_PROTOCOL * efi_describe ( struct interface *interface );

43
src/interface/efi/efi_path.c
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@@ -19,6 +19,7 @@
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <ipxe/uri.h>
#include <ipxe/usb.h> #include <ipxe/usb.h>
#include <ipxe/efi/efi.h> #include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_driver.h> #include <ipxe/efi/efi_driver.h>
@@ -60,6 +61,48 @@ size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path ) {
return ( ( ( void * ) end ) - ( ( void * ) path ) ); return ( ( ( void * ) end ) - ( ( void * ) path ) );
} }
/**
* Construct EFI device path for URI
*
* @v uri URI
* @ret path EFI device path, or NULL on error
*
* The caller is responsible for eventually calling free() on the
* allocated device path.
*/
EFI_DEVICE_PATH_PROTOCOL * efi_uri_path ( struct uri *uri ) {
EFI_DEVICE_PATH_PROTOCOL *path;
EFI_DEVICE_PATH_PROTOCOL *end;
URI_DEVICE_PATH *uripath;
size_t uri_len;
size_t uripath_len;
size_t len;
/* Calculate device path length */
uri_len = ( format_uri ( uri, NULL, 0 ) + 1 /* NUL */ );
uripath_len = ( sizeof ( *uripath ) + uri_len );
len = ( uripath_len + sizeof ( *end ) );
/* Allocate device path */
path = zalloc ( len );
if ( ! path )
return NULL;
/* Construct device path */
uripath = ( ( void * ) path );
uripath->Header.Type = MESSAGING_DEVICE_PATH;
uripath->Header.SubType = MSG_URI_DP;
uripath->Header.Length[0] = ( uripath_len & 0xff );
uripath->Header.Length[1] = ( uripath_len >> 8 );
format_uri ( uri, uripath->Uri, uri_len );
end = ( ( ( void * ) path ) + uripath_len );
end->Type = END_DEVICE_PATH_TYPE;
end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
end->Length[0] = sizeof ( *end );
return path;
}
/** /**
* Construct EFI device path for USB function * Construct EFI device path for USB function
* *