From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AEE9AECAAA1 for ; Tue, 30 Aug 2022 17:36:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232125AbiH3Rgo (ORCPT ); Tue, 30 Aug 2022 13:36:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232124AbiH3RgY (ORCPT ); Tue, 30 Aug 2022 13:36:24 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F39BA12EC45; Tue, 30 Aug 2022 10:32:50 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C0DF361781; Tue, 30 Aug 2022 17:25:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D7A0C433C1; Tue, 30 Aug 2022 17:25:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661880310; bh=N54jdVkof+muCPJ5An3tzyobpI6h9WDtXN5V959Xct8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NANdLANAQ+m3rTMDn+0LclcTrvD1GTqPu/B6SSEQSeCdywQZ/S04YCkCWwIKjQoCP 74SqjqwPIa+GH7mieUIfym1J5+Aq15I1R4j18l+pSBAAWUvCIz2vh925ITmdz7bZFH OGrQR1OlEuP3slHtwbBKZBDm6UyRSabCWxS34CAegH/pkjRUwAnERmwyE5hWB/5kTr 9nUCSQQe1OCXZRqx9huliJx6R2DOORFZD9DLaABfBDKx+y1KezaSgL8q6MF3HI/B75 I2kASTIvoilEso4VI+D35qRskaNos94YN+IO4Olh9aEOH0Qhpv9sY0BW6YLRuwtJU/ BZlgdV0U49dFQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Helge Deller , Sasha Levin , James.Bottomley@HansenPartnership.com, svens@stackframe.org, linux-parisc@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 07/12] parisc: Add runtime check to prevent PA2.0 kernels on PA1.x machines Date: Tue, 30 Aug 2022 13:24:38 -0400 Message-Id: <20220830172444.581654-7-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220830172444.581654-1-sashal@kernel.org> References: <20220830172444.581654-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Helge Deller [ Upstream commit 591d2108f3abc4db9f9073cae37cf3591fd250d6 ] If a 32-bit kernel was compiled for PA2.0 CPUs, it won't be able to run on machines with PA1.x CPUs. Add a check and bail out early if a PA1.x machine is detected. Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- arch/parisc/kernel/head.S | 43 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S index 951a339369dd5..b59a0c3d36921 100644 --- a/arch/parisc/kernel/head.S +++ b/arch/parisc/kernel/head.S @@ -22,7 +22,7 @@ #include #include - .level PA_ASM_LEVEL + .level 1.1 __INITDATA ENTRY(boot_args) @@ -69,6 +69,47 @@ $bss_loop: stw,ma %arg2,4(%r1) stw,ma %arg3,4(%r1) +#if !defined(CONFIG_64BIT) && defined(CONFIG_PA20) + /* This 32-bit kernel was compiled for PA2.0 CPUs. Check current CPU + * and halt kernel if we detect a PA1.x CPU. */ + ldi 32,%r10 + mtctl %r10,%cr11 + .level 2.0 + mfctl,w %cr11,%r10 + .level 1.1 + comib,<>,n 0,%r10,$cpu_ok + + load32 PA(msg1),%arg0 + ldi msg1_end-msg1,%arg1 +$iodc_panic: + copy %arg0, %r10 + copy %arg1, %r11 + load32 PA(init_stack),%sp +#define MEM_CONS 0x3A0 + ldw MEM_CONS+32(%r0),%arg0 // HPA + ldi ENTRY_IO_COUT,%arg1 + ldw MEM_CONS+36(%r0),%arg2 // SPA + ldw MEM_CONS+8(%r0),%arg3 // layers + load32 PA(__bss_start),%r1 + stw %r1,-52(%sp) // arg4 + stw %r0,-56(%sp) // arg5 + stw %r10,-60(%sp) // arg6 = ptr to text + stw %r11,-64(%sp) // arg7 = len + stw %r0,-68(%sp) // arg8 + load32 PA(.iodc_panic_ret), %rp + ldw MEM_CONS+40(%r0),%r1 // ENTRY_IODC + bv,n (%r1) +.iodc_panic_ret: + b . /* wait endless with ... */ + or %r10,%r10,%r10 /* qemu idle sleep */ +msg1: .ascii "Can't boot kernel which was built for PA8x00 CPUs on this machine.\r\n" +msg1_end: + +$cpu_ok: +#endif + + .level PA_ASM_LEVEL + /* Initialize startup VM. Just map first 16/32 MB of memory */ load32 PA(swapper_pg_dir),%r4 mtctl %r4,%cr24 /* Initialize kernel root pointer */ -- 2.35.1