From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.171]) by ozlabs.org (Postfix) with ESMTP id 3821967A05 for ; Sun, 30 Apr 2006 21:42:26 +1000 (EST) From: Arnd Bergmann To: linuxppc-dev@ozlabs.org Subject: Re: please pull powerpc.git 'merge' branch Date: Sun, 30 Apr 2006 13:42:01 +0200 References: <17491.1134.565353.149941@cargo.ozlabs.ibm.com> <71339D1F-CAF1-4FF0-A1A3-1A74B8984F05@kernel.crashing.org> <20060430042059.GO5518@pb15.lixom.net> In-Reply-To: <20060430042059.GO5518@pb15.lixom.net> MIME-Version: 1.0 Message-Id: <200604301342.02043.arnd@arndb.de> Content-Type: text/plain; charset="utf-8" Cc: Olof Johansson , torvalds@osdl.org, Paul Mackerras List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Sunday 30 April 2006 06:20, Olof Johansson wrote: > We already have SMT, ICACHE_SNOOP and ALTIVEC feature bits, so it probably > makes sense to stay in the ARCH_2_05 direction. Unfortunately it might > be tricky to rename the old defines now due to userland exposure. > > I guess Cell breaks all this logic though. Which PPC base version does > it implement? The Cell Broadband Engine Architecture in theory is 2.03 and also mandates some of the extensions that are optional in there. The relevant sections in the specs are: | 4.1.1 Optional Features in PowerPC Architecture, Book I (Required for | CBEA) | The following facilities and instructions are considered optional in | the PowerPC Architecture, but are required for the PPE by the CBEA | user mode environment. | • Floating reciprocal estimate single A-form (fres) | • Floating reciprocal square-root estimate A-form (frsqte) | • Vector/SIMD multimedia extension | Note: The optional PowerPC floating-point instructions that are | mandatory in the CBEA are needed for the application space targeted | by the CBEA. | | 4.1.3 Optional Features in PowerPC Architecture, Book II (Required | for CBEA) | The following facilities and instructions are considered optional | in the PowerPC Architecture, but are required in the CBEA. | • Data cache block touch X-form (dcbt) | This is an optional version of dcbt that permits a program to | provide a hint that a sequence of data cache blocks is likely | to be needed soon. | Book II describes these facilities and instructions. I believe the actual implementation is missing one of the mandatory features of 2.03 that was not in 2.02 though. Arnd <><