diff options
| -rw-r--r-- | src/interface/efi/efi_file.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/interface/efi/efi_file.c b/src/interface/efi/efi_file.c index c67fdea54..fc64b369c 100644 --- a/src/interface/efi/efi_file.c +++ b/src/interface/efi/efi_file.c @@ -38,6 +38,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <errno.h> #include <wchar.h> #include <ipxe/image.h> +#include <ipxe/cpio.h> #include <ipxe/efi/efi.h> #include <ipxe/efi/Protocol/SimpleFileSystem.h> #include <ipxe/efi/Protocol/BlockIo.h> @@ -84,6 +85,7 @@ struct efi_file { }; static struct efi_file efi_file_root; +static struct efi_file efi_file_initrd; /** * Free EFI file @@ -210,6 +212,67 @@ static size_t efi_file_read_image ( struct efi_file_reader *reader ) { } /** + * Read from magic initrd file + * + * @v reader EFI file reader + * @ret len Length read + */ +static size_t efi_file_read_initrd ( struct efi_file_reader *reader ) { + struct efi_file *file = reader->file; + struct cpio_header cpio; + struct image *image; + const char *name; + size_t pad_len; + size_t cpio_len; + size_t name_len; + size_t len; + + /* Read from file */ + len = 0; + for_each_image ( image ) { + + /* Ignore currently executing image */ + if ( image == current_image ) + continue; + + /* Pad to alignment boundary */ + pad_len = ( ( -reader->pos ) & ( INITRD_ALIGN - 1 ) ); + if ( pad_len ) { + DBGC ( file, "EFIFILE %s [%#08zx,%#08zx) pad\n", + efi_file_name ( file ), reader->pos, + ( reader->pos + pad_len ) ); + } + len += efi_file_read_chunk ( reader, UNULL, pad_len ); + + /* Read CPIO header, if applicable */ + cpio_len = cpio_header ( image, &cpio ); + if ( cpio_len ) { + name = cpio_name ( image ); + name_len = cpio_name_len ( image ); + pad_len = ( cpio_len - sizeof ( cpio ) - name_len ); + DBGC ( file, "EFIFILE %s [%#08zx,%#08zx) %s header\n", + efi_file_name ( file ), reader->pos, + ( reader->pos + cpio_len ), image->name ); + len += efi_file_read_chunk ( reader, + virt_to_user ( &cpio ), + sizeof ( cpio ) ); + len += efi_file_read_chunk ( reader, + virt_to_user ( name ), + name_len ); + len += efi_file_read_chunk ( reader, UNULL, pad_len ); + } + + /* Read file data */ + DBGC ( file, "EFIFILE %s [%#08zx,%#08zx) %s\n", + efi_file_name ( file ), reader->pos, + ( reader->pos + image->len ), image->name ); + len += efi_file_read_chunk ( reader, image->data, image->len ); + } + + return len; +} + +/** * Open fixed file * * @v file EFI file @@ -289,6 +352,10 @@ efi_file_open ( EFI_FILE_PROTOCOL *this, EFI_FILE_PROTOCOL **new, return EFI_WRITE_PROTECTED; } + /* Allow magic initrd to be opened */ + if ( strcasecmp ( name, efi_file_initrd.name ) == 0 ) + return efi_file_open_fixed ( &efi_file_initrd, new ); + /* Identify image */ image = efi_file_find ( name ); if ( ! image ) { @@ -637,6 +704,27 @@ static struct efi_file efi_file_root = { .name = "", }; +/** Magic initrd file */ +static struct efi_file efi_file_initrd = { + .refcnt = REF_INIT ( ref_no_free ), + .file = { + .Revision = EFI_FILE_PROTOCOL_REVISION, + .Open = efi_file_open, + .Close = efi_file_close, + .Delete = efi_file_delete, + .Read = efi_file_read, + .Write = efi_file_write, + .GetPosition = efi_file_get_position, + .SetPosition = efi_file_set_position, + .GetInfo = efi_file_get_info, + .SetInfo = efi_file_set_info, + .Flush = efi_file_flush, + }, + .image = NULL, + .name = "initrd.magic", + .read = efi_file_read_initrd, +}; + /** * Open root directory * |