From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id C0B801A0FFD for ; Thu, 2 Jul 2015 21:35:48 +1000 (AEST) Received: from e28smtp06.in.ibm.com (e28smtp06.in.ibm.com [122.248.162.6]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 177C31402BA for ; Thu, 2 Jul 2015 21:35:47 +1000 (AEST) Received: from /spool/local by e28smtp06.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 2 Jul 2015 17:05:42 +0530 Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id E96A5394005B for ; Thu, 2 Jul 2015 17:05:42 +0530 (IST) Received: from d28av02.in.ibm.com (d28av02.in.ibm.com [9.184.220.64]) by d28relay01.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t62BZg3u54001764 for ; Thu, 2 Jul 2015 17:05:42 +0530 Received: from d28av02.in.ibm.com (localhost [127.0.0.1]) by d28av02.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t62AREPY016592 for ; Thu, 2 Jul 2015 15:57:15 +0530 From: Nikunj A Dadhania To: linuxppc-dev@ozlabs.org, thuth@redhat.com, segher@kernel.crashing.org Cc: aik@ozlabs.ru, dvaleev@suse.com, nikunj@linux.vnet.ibm.com Subject: [PATCH SLOF v4 3/4] disk-label: introduce helper to check fat filesystem Date: Thu, 2 Jul 2015 17:05:37 +0530 Message-Id: <1435836938-22889-4-git-send-email-nikunj@linux.vnet.ibm.com> In-Reply-To: <1435836938-22889-1-git-send-email-nikunj@linux.vnet.ibm.com> References: <1435836938-22889-1-git-send-email-nikunj@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Signed-off-by: Nikunj A Dadhania Reviewed-by: Thomas Huth --- slof/fs/packages/disk-label.fs | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/slof/fs/packages/disk-label.fs b/slof/fs/packages/disk-label.fs index b346774..142e54f 100644 --- a/slof/fs/packages/disk-label.fs +++ b/slof/fs/packages/disk-label.fs @@ -320,6 +320,14 @@ CONSTANT /gpt-part-entry \ Load from first active DOS boot partition. +: fat-bootblock? ( addr -- flag ) + \ byte 0-2 of the bootblock is a jump instruction in + \ all FAT filesystems. + \ e9 and eb are jump instructions in x86 assembler. + dup c@ e9 = IF drop true EXIT THEN + dup c@ eb = swap 2+ c@ 90 = and +; + \ NOTE: block-size is always 512 bytes for DOS partition tables. : load-from-dos-boot-partition ( addr -- size ) @@ -547,14 +555,7 @@ AA268B49521E5A8B CONSTANT GPT-PREP-PARTITION-4 : try-dos-files ( -- found? ) no-mbr? IF false EXIT THEN - \ block 0 byte 0-2 is a jump instruction in all FAT - \ filesystems. - \ e9 and eb are jump instructions in x86 assembler. - block c@ e9 <> IF - block c@ eb <> - block 2+ c@ 90 <> or - IF false EXIT THEN - THEN + block fat-bootblock? 0= IF false EXIT THEN s" fat-files" (interpose-filesystem) true ; -- 2.4.3