From owner-freebsd-current@freebsd.org Sat May 26 10:15:19 2018 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8E737F70501 for ; Sat, 26 May 2018 10:15:19 +0000 (UTC) (envelope-from johalun0@gmail.com) Received: from mail-wm0-x22f.google.com (mail-wm0-x22f.google.com [IPv6:2a00:1450:400c:c09::22f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 04A5A6A317 for ; Sat, 26 May 2018 10:15:19 +0000 (UTC) (envelope-from johalun0@gmail.com) Received: by mail-wm0-x22f.google.com with SMTP id f6-v6so20302834wmc.4 for ; Sat, 26 May 2018 03:15:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=liDqVzeuNm+9t3j5hWISSjy3ipu7zkPuDkEYX7ny1VQ=; b=Nz9I9kGnMK4xWpr4NW08MlspPWptJYlcrnc7fJLp1S+1vyi4G0nJHs0IhnoRs+30Yp UtfPngQKGxEiwyPvMYOIgmK9X80PV3rBxBs1J4dvZ281OKqvQVkvaJtrGmN0I8uassgC tmbFXoBpULA7JufnQqU8FJE3yO0heD7Bs1RijeP3HHfFiiSEcpvbWZfzMBKBN2LYuOgg ND9LFKgoyAK3S6ztPg2CFaZTR50jpZ006Jj/XYPbw3vENf6zJrQ9hop4Cw+hi+mmN08n aG3TR9ZiwHcqKbVThDmLUYlpRtOdDstjB3H+ztkANoGLn+L1o4iAc1YDZQbEYWje25K3 a0IA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=liDqVzeuNm+9t3j5hWISSjy3ipu7zkPuDkEYX7ny1VQ=; b=C/evMds/YlE7SFKcC3cbOLVvF/CO+EGgOqLhOfKGU3fDkjDUP2QWd/XateWev1tZ89 G7vK18kojalXD+cqRq/owkVoU0VwXH0Tsd56eSxn7+Zb17CBUqGkLpnQvUUE2cRvBeaz BZcn+vVUSINAaUvSbrDpOTSMAFATZXliSQ+XULPGbZ8whs+EoIYmHi5vg3kC5Dt0JSJp I5I6/dphlx3LTqPCVP3DYhi2ElpYMnUpeteceP5Cxi2m5scXSTUtU9SMRnZqUQ7fIxWI qdNVlYbqpqKsrhB4STFsqtALMHXXnURq2BGnOcWcMZEFdcpDIjc4L0kG4xqXa209ge1D cmPA== X-Gm-Message-State: ALKqPwepomtHj6KtmB9IOLgicBpH8swz5UOft9w8PzmtumSzxw/Ijw00 lonAbxS7j8DIbNCmszdADEH1m8tWpXyszC29Rsw= X-Google-Smtp-Source: AB8JxZpkVMAARuwf4/neNk24HxPkF7tQSzMh/RER5rzo8RNHhXTPPbwEoADIbJGvh964P263KFr8b9ch7B3eGTHrD1s= X-Received: by 2002:a1c:f714:: with SMTP id v20-v6mr4555657wmh.73.1527329717888; Sat, 26 May 2018 03:15:17 -0700 (PDT) MIME-Version: 1.0 References: <20180526101059.GM88128@kib.kiev.ua> In-Reply-To: <20180526101059.GM88128@kib.kiev.ua> From: Johannes Lundberg Date: Sat, 26 May 2018 11:14:41 +0100 Message-ID: Subject: Re: Floating point in kernel? To: Konstantin Belousov Cc: freebsd-current Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.26 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 May 2018 10:15:19 -0000 On Sat, May 26, 2018 at 11:11 AM Konstantin Belousov wrote: > On Sat, May 26, 2018 at 10:59:50AM +0100, Johannes Lundberg wrote: > > Hi > > > > The new AMD graphics drivers use floats in kernel space. > > Upstream Linux code has something like: > > kernel_fpu_begin(); > > ... > > kernel_fpu_end(); > > > > Do we have similar functions to save/restore FPU registers? > Read fpu_kern(9). > Thanks! Actually I found that just after hitting the send button :)