About variable "IOPortBase"
belcon zhao
belcon.zhao at siliconmotion.com.cn
Wed Mar 26 19:05:10 PDT 2008
Hi all,
I compiled Xorg server from source code. My linux distribution is
Debians and CPU is mipsel. I have tried source packages from freedesktop
and debians. But xorg crashed when I tried to make it work. I just found
it happened while graphic chip driver call outb(), which is defined as
below:
static __inline__ void
outb(unsigned PORT_SIZE port, unsigned char val)
{
*(volatile unsigned char*)(((unsigned
PORT_SIZE)(port))+IOPortBase) = val;
}.
IOPortBase is defined in the same head file
"hw/xfree86/common/compiler.h"
I had grepped IOPortBase in the whole source code and I got below:
hw/xfree86/os-support/bsd/arm_video.c: IOPortBase =
base;
hw/xfree86/os-support/bsd/arm_video.c: IOPortBase =
base;
hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned int)-1;
hw/xfree86/os-support/bsd/arm_video.c: * space (e.g. 0x3B0), but
IOPortBase is expected to map to
hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned
int)xf86MapInfoMap(memInfoP,
hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned
int)base;
hw/xfree86/os-support/bsd/arm_video.c: if (IOPortBase ==
(unsigned int)-1)
hw/xfree86/os-support/bsd/arm_video.c: munmap((caddr_t)IOPortBase,
0x400);
hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned int)-1;
hw/xfree86/common/compiler.h:unsigned int IOPortBase; /* Memory mapped
I/O port area */
hw/xfree86/common/compiler.h: *(volatile unsigned char*)(((unsigned
PORT_SIZE)(port))+IOPortBase) = val;
hw/xfree86/common/compiler.h: *(volatile unsigned short*)(((unsigned
PORT_SIZE)(port))+IOPortBase) = val;
hw/xfree86/common/compiler.h: *(volatile unsigned int*)(((unsigned
PORT_SIZE)(port))+IOPortBase) = val;
hw/xfree86/common/compiler.h: return *(volatile unsigned
char*)(((unsigned PORT_SIZE)(port))+IOPortBase);
hw/xfree86/common/compiler.h: return *(volatile unsigned
short*)(((unsigned PORT_SIZE)(port))+IOPortBase);
hw/xfree86/common/compiler.h: return *(volatile unsigned
int*)(((unsigned PORT_SIZE)(port))+IOPortBase);
To the file arm_video.c, only the first line worked others are remarked.
The first line is in the function:
#if defined(USE_ARC_MMAP) || defined(__arm32__)
Bool
xf86EnableIO()
{
int fd;
pointer base;
if (ExtendedEnabled)
return TRUE;
if ((fd = open("/dev/ttyC0", O_RDWR)) >= 0) {
/* Try to map a page at the pccons I/O space */
base = (pointer)mmap((caddr_t)0, 65536, PROT_READ |
PROT_WRITE,
MAP_FLAGS, fd, (off_t)0x0000);
if (base != (pointer)-1) {
IOPortBase = base;
}
else {
xf86Msg(X_WARNING,"EnableIO: failed to mmap %s
(%s)\n",
"/dev/ttyC0", strerror(errno));
return FALSE;
}
}
else {
xf86Msg("EnableIO: failed to open %s (%s)\n",
"/dev/ttyC0", strerror(errno));
return FALSE;
}
ExtendedEnabled = TRUE;
return TRUE;
}
Since there is "#if defined(USE_ARC_MMAP) || defined(__arm32__)", I am
not sure that this function had been compiled into Xorg.
I just test this
#include <stdio.h>
int main(void)
{
#if defined(__mips__)
printf("mips\n");
#elif defined(__arm32__)
printf("arm32\n");
#else
printf("hehe\n");
#endif
return 0;
}
and it just show "mips". So I am afraid that the function xf86EnableIO()
which assigned value to IOPortBase wouldn't been compiled into Xorg.
IOPortBase is 0 if I use my own Xorg.
I also tried the default Xorg which works fine. IOPortBase is not 0.
I compiled Xorg with "--enable-debug --prefix=/root/belcon".
Any one has any ideas? Maybe it is just something related to
"./configure".
Regards,
Belcon
Below is gdb output:
gdb hw/xfree86/Xorg
GNU gdb 6.4.90-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "mipsel-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".
(gdb) run
Starting program: /root/belcon/xorg-server-1.1.1/hw/xfree86/Xorg
_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6
_XSERVTransOpen: transport open failed for inet6/debian:0
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6
X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Operating System: Linux 2.6.18.1 mips64
Current Operating System: Linux debian 2.6.18.1 #3 Mon Sep 3 12:52:27
CST 2007 mips64
Build Date: 21 March 2008
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/root/belcon//var/log/Xorg.0.log", Time: Mon Mar 24
14:18:39 2008
(==) Using config file: "/etc/X11/xorg.conf"
[tcsetpgrp failed in terminal_inferior: 不允许的操作]
(EE) Silicon MotionlcdWidth = 1280
LCD Base = 0
FBOffset is 0x0
Program received signal SIGSEGV, Segmentation fault.
SMI_SaveScreen (pScreen=<value optimized out>, mode=<value optimized
out>)
at /usr/include/xorg/compiler.h:916
916 *(volatile unsigned char*)(((unsigned
PORT_SIZE)(port))+IOPortBase) = val;
(gdb) print IOPortBase
$1 = 0
(gdb) bt f
#0 SMI_SaveScreen (pScreen=<value optimized out>, mode=<value optimized
out>)
at /usr/include/xorg/compiler.h:916
seq1 = <value optimized out>
pScrn = <value optimized out>
on = 1
pSmi = (SMIPtr) 0x64a280
#1 0x0042ef10 in SaveScreens (on=2, mode=0) at window.c:3386
i = 0
what = 1
type = 1
#2 0x00423d00 in main (argc=1, argv=0x7f80bab4, envp=<value optimized
out>)
at main.c:434
pScreen = <value optimized out>
i = 1
error = 6412720
xauthfile = <value optimized out>
alwaysCheckForInput = {0, 1}
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