Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758625AbYGHXmO (ORCPT ); Tue, 8 Jul 2008 19:42:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754878AbYGHXl7 (ORCPT ); Tue, 8 Jul 2008 19:41:59 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:42882 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753905AbYGHXl5 (ORCPT ); Tue, 8 Jul 2008 19:41:57 -0400 From: ebiederm@xmission.com (Eric W. Biederman) To: Mike Travis Cc: "Eric W. Biederman" , "H. Peter Anvin" , Jeremy Fitzhardinge , Christoph Lameter , Linux Kernel Mailing List , Ingo Molnar , Andrew Morton , Jack Steiner References: <20080604003018.538497000@polaris-admin.engr.sgi.com> <48691556.2080208@zytor.com> <48691E8B.4040605@sgi.com> <48694B3B.3010600@goop.org> <486A61A7.1000902@zytor.com> <486A68DD.80702@goop.org> <486A9D4F.8010508@goop.org> <486AA72B.6010401@goop.org> <486AC9D9.9030506@zytor.com> <486AD6BD.9080600@sgi.com> <486ADD67.1020809@sgi.com> <486ADD9F.3000305@zytor.com> <486C062C.3090408@sgi.com> <48724FB4.3090305@sgi.com> <4873B016.8010404@sgi.com> Date: Tue, 08 Jul 2008 16:36:49 -0700 In-Reply-To: <4873B016.8010404@sgi.com> (Mike Travis's message of "Tue, 08 Jul 2008 11:21:10 -0700") Message-ID: User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" X-SA-Exim-Connect-IP: 24.130.11.59 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-DCC: XMission; sa04 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ;Mike Travis X-Spam-Relay-Country: X-Spam-Report: * -1.8 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -0.2 BAYES_40 BODY: Bayesian spam probability is 20 to 40% * [score: 0.2829] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa04 1397; Body=1 Fuz1=1 Fuz2=1] * 0.4 XMBrknScrpt_02 Possible Broken Spam Script * 0.5 XM_Body_Dirty_Words Contains a dirty word * 0.0 XM_SPF_Neutral SPF-Neutral Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area X-SA-Exim-Version: 4.2 (built Thu, 03 Mar 2005 10:44:12 +0100) X-SA-Exim-Scanned: Yes (on mgr1.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6637 Lines: 347 --=-=-= Mike Travis writes: > Unfortunately it's back to the problem of faulting before x86_64_start_kernel() > and grub just immediately reboots. So I'm back at analyzing assembler and > config differences. Ok. That is a narrow window of code. So it shouldn't be too bad, nasty though. If you would like to trace through it I have attached my serial port debugging routines that I use in that part of the code. Eric --=-=-= Content-Disposition: inline; filename=linux-debug.S #if 1 /* Base Address */ #define TTYS0_BASE 0x3f8 /* Data */ #define TTYS0_RBR (TTYS0_BASE+0x00) #define TTYS0_TBR (TTYS0_BASE+0x00) /* Control */ #define TTYS0_IER (TTYS0_BASE+0x01) #define TTYS0_IIR (TTYS0_BASE+0x02) #define TTYS0_FCR (TTYS0_BASE+0x02) #define TTYS0_LCR (TTYS0_BASE+0x03) #define TTYS0_MCR (TTYS0_BASE+0x04) #define TTYS0_DLL (TTYS0_BASE+0x00) #define TTYS0_DLM (TTYS0_BASE+0x01) /* Status */ #define TTYS0_LSR (TTYS0_BASE+0x05) #define TTYS0_MSR (TTYS0_BASE+0x06) #define TTYS0_SCR (TTYS0_BASE+0x07) #define TTYS0_BAUD 9600 #define TTYS0_DIV (115200/TTYS0_BAUD) #define TTYS0_DIV_LO (TTYS0_DIV&0xFF) #define TTYS0_DIV_HI ((TTYS0_DIV >> 8)&0xFF) #if ((115200%TTYS0_BAUD) != 0) #error Bad ttyS0 baud rate #endif #define TTYS0_INIT \ /* disable interrupts */ \ movb $0x00, %al ; \ movw $TTYS0_IER, %dx ; \ outb %al, %dx ; \ ; \ /* enable fifos */ \ movb $0x01, %al ; \ movw $TTYS0_FCR, %dx ; \ outb %al, %dx ; \ ; \ /* Set Baud Rate Divisor to TTYS0_BAUD */ \ movw $TTYS0_LCR, %dx ; \ movb $0x83, %al ; \ outb %al, %dx ; \ ; \ movw $TTYS0_DLL, %dx ; \ movb $TTYS0_DIV_LO, %al ; \ outb %al, %dx ; \ ; \ movw $TTYS0_DLM, %dx ; \ movb $TTYS0_DIV_HI, %al ; \ outb %al, %dx ; \ ; \ movw $TTYS0_LCR, %dx ; \ movb $0x03, %al ; \ outb %al, %dx /* uses: ax, dx */ #define TTYS0_TX_AL \ mov %al, %ah ; \ 9: mov $TTYS0_LSR, %dx ; \ inb %dx, %al ; \ test $0x20, %al ; \ je 9b ; \ mov $TTYS0_TBR, %dx ; \ mov %ah, %al ; \ outb %al, %dx /* uses: ax, dx */ #define TTYS0_TX_CHAR(byte) \ mov byte, %al ; \ TTYS0_TX_AL /* uses: eax, dx */ #define TTYS0_TX_HEX32(lword) \ mov lword, %eax ; \ shr $28, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %eax ; \ shr $24, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %eax ; \ shr $20, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %eax ; \ shr $16, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %eax ; \ shr $12, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %eax ; \ shr $8, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %eax ; \ shr $4, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %eax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL /* uses: rax, dx */ #define TTYS0_TX_HEX64(lword) \ mov lword, %rax ; \ shr $60, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $56, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $52, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $48, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $44, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $40, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $36, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $32, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $28, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $24, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $20, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $16, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $12, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $8, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ shr $4, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL ; \ ; \ mov lword, %rax ; \ and $0x0f, %al ; \ add $'0', %al ; \ cmp $'9', %al ; \ jle 9f ; \ add $39, %al ; \ 9: ; \ TTYS0_TX_AL #define DEBUG(x) TTYS0_TX_CHAR($x) ; TTYS0_TX_CHAR($'\r') ; TTYS0_TX_CHAR($'\n') #define DEBUG_TX_HEX32(x) TTYS0_TX_HEX32(x); TTYS0_TX_CHAR($'\r') ; TTYS0_TX_CHAR($'\n') #define DEBUG_TX_HEX64(x) TTYS0_TX_HEX64(x); TTYS0_TX_CHAR($'\r') ; TTYS0_TX_CHAR($'\n') #endif --=-=-=-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/