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 51A0B1A0FB8 for ; Thu, 25 Jun 2015 16:46:41 +1000 (AEST) Received: from e23smtp09.au.ibm.com (e23smtp09.au.ibm.com [202.81.31.142]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 1BBAD1402ED for ; Thu, 25 Jun 2015 16:46:41 +1000 (AEST) Received: from /spool/local by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 25 Jun 2015 16:46:40 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id AB2722BB003F for ; Thu, 25 Jun 2015 16:46:38 +1000 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t5P6kUxY16973952 for ; Thu, 25 Jun 2015 16:46:38 +1000 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t5P6k57T022154 for ; Thu, 25 Jun 2015 16:46:06 +1000 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 v2 4/5] disk-label: introduce helper to check fat filesystem Date: Thu, 25 Jun 2015 12:15:28 +0530 Message-Id: <1435214729-15952-5-git-send-email-nikunj@linux.vnet.ibm.com> In-Reply-To: <1435214729-15952-1-git-send-email-nikunj@linux.vnet.ibm.com> References: <1435214729-15952-1-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 --- 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 0995808..7ed5526 100644 --- a/slof/fs/packages/disk-label.fs +++ b/slof/fs/packages/disk-label.fs @@ -321,6 +321,14 @@ 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 ) @@ -549,14 +557,7 @@ AA268B49521E5A8B CONSTANT GPT-PREP-PARTITION-4 : try-dos-files ( -- found? ) no-mbr? IF false EXIT THEN - \ disk-buf 0 byte 0-2 is a jump instruction in all FAT - \ filesystems. - \ e9 and eb are jump instructions in x86 assembler. - disk-buf c@ e9 <> IF - disk-buf c@ eb <> - disk-buf 2+ c@ 90 <> or - IF false EXIT THEN - THEN + disk-buf fat-bootblock? 0= IF false EXIT THEN s" fat-files" (interpose-filesystem) true ; -- 2.4.3