Hi,
I tried GNU Mach with plex86 today, and the first problem I found was in the
com probe code. GNU Mach has in i386/i386at/com.c (comprobe_general):
int
comprobe_general(struct bus_device *dev, int noisy)
{
u_short addr = dev->address;
int unit = dev->unit;
int oldctl, oldmsb;
char *type = "8250";
int i;
if ((unit < 0) || (unit > NCOM)) {
printf("com %d out of range\n", unit);
return(0);
}
oldctl = inb(LINE_CTL(addr)); /* Save old value of LINE_CTL */
oldmsb = inb(BAUD_MSB(addr)); /* Save old value of BAUD_MSB */
outb(LINE_CTL(addr), 0); /* Select INTR_ENAB */
outb(BAUD_MSB(addr), 0);
if (inb(BAUD_MSB(addr)) != 0)
{
outb(LINE_CTL(addr), oldctl);
outb(BAUD_MSB(addr), oldmsb);
return 0;
}
outb(LINE_CTL(addr), iDLAB); /* Select BAUD_MSB */
outb(BAUD_MSB(addr), 255);
if (inb(BAUD_MSB(addr)) != 255)
{
outb(LINE_CTL(addr), oldctl);
outb(BAUD_MSB(addr), oldmsb);
return 0;
}
outb(LINE_CTL(addr), 0); /* Select INTR_ENAB */
XXX: The above command is the one!
if (inb(BAUD_MSB(addr)) != 0) /* Check that it has kept its value*/
{
outb(LINE_CTL(addr), oldctl);
outb(BAUD_MSB(addr), oldmsb);
return 0;
}
/* Com port found, now check what chip it has */
....
}
The command indicated by the XXX above makes plex86 hang. No further
program code in the kernel is processed. A gdb backtrace doesn't show much:
(gdb) bt
#0 0x401555f4 in ioctl () from /lib/libc.so.6
#1 0x403a8400 in ?? ()
#2 0x804a20a in main (argc=4, argv=0xbffffb44) at plex86.c:284
#3 0x400ac38b in __libc_start_main () from /lib/libc.so.6
I can post more info, like disk images, configuration files etc. Please
tell me what you think is relevant, as I can't make a good guess.
Wenn I commented out the com probing code, it made more progress, and then I
get a segmentation fault from plex86 in the Load_context() code of GNU Mach
(machine/cswitch.S).
ENTRY(Load_context)
movl S_ARG0,%ecx /* get thread */
movl TH_KERNEL_STACK(%ecx),%ecx /* get kernel stack */
lea KERNEL_STACK_SIZE-IKS_SIZE-IEL_SIZE(%ecx),%edx
/* point to stack top */
CPU_NUMBER(%eax)
movl %ecx,CX(EXT(active_stacks),%eax) /* store stack
address */
movl %edx,CX(EXT(kernel_stack),%eax) /* store stack top */
movl KSS_ESP(%ecx),%esp /* switch stacks */
movl KSS_ESI(%ecx),%esi /* restore registers */
movl KSS_EDI(%ecx),%edi
movl KSS_EBP(%ecx),%ebp
movl KSS_EBX(%ecx),%ebx
xorl %eax,%eax /* return zero (no old
thread) */
jmp *KSS_EIP(%ecx) /* resume thread */
Where exactly there I cannot tell.
The message from plex is:
Processing command-line options
Opening VM (/dev/plex86)
Processing config file ../../boot-20010605.conf...
Allocating 8MB of physical memory in VM
Mapping virtualized physical memory into monitor
Zeroing virtualized physical memory
Mapping monitor print buffer into user mem.
bochs: ips = 1000000
unmapped_c::init: IGNORING unmapped ports
bochs: [cmos] Setting initial clock to: Mon Jun 25 22:23:49 2001
bochs: Opening image for device 0
bochs: bx_options.floppy_command_delay = 500
vga construct static
bochs: font_width = 8
bochs: font_height = 16
bochs: default_depth = 16
bochs: waiting for MapNotify
bochs: MapNotify found.
bochs: vga: interval=200000
vga init called
bochs: TTY not used, serial port is not connected
ROM: loading image '../bios/BIOS-plex86-2000_0817a' @ 0xf0000 (65536 bytes)
ROM: loading image '../bios/VGABIOS-elpin-2.40' @ 0xc0000 (32768 bytes)
Setting prescan depth to 3
prescan on
Processed 62 lines of config file '../../boot-20010605.conf'
Initializing plugins
Memory: 8
Text address: 0x0
Stack address: 0x0
Running VM
::init_monitor OK -----------------
nexus_size = 0x24E
bochs: CMOS: write reg 14h: value = 05h
::sysIOOut: No handler defined for port 0x46E8!.
::sysIOOut: No handler defined for port 0x102!.
::sysIOOut: No handler defined for port 0x4AE8!.
bochs: vga: io write: 3cf: reg 05: value = 10h
bochs: vga: io write: 3da: ignoring: feature ctrl & vert sync
bochs: *** io read 3c5 case 1: sequencer clocking mode
bochs: vga: io write 3c0: address mode reg=16
bochs: vga: io write 3c0: address mode reg=17
bochs: vga: io write 3c0: address mode reg=18
bochs: vga: io write 3c0: address mode reg=19
bochs: vga: io write 3c0: address mode reg=20
bochs: *** io read 3c5 case 1: sequencer clocking mode
bochs: vga: io write: 3cf: reg 05: value = 10h
bochs: *** io read 3c5 case 1: sequencer clocking mode
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
bochs: vga: io write: 3cf: reg 05: value = 10h
bochs: vga: io write: 3da: ignoring: feature ctrl & vert sync
bochs: *** io read 3c5 case 1: sequencer clocking mode
bochs: vga: io write 3c0: address mode reg=16
bochs: vga: io write 3c0: address mode reg=17
bochs: vga: io write 3c0: address mode reg=18
bochs: vga: io write 3c0: address mode reg=19
bochs: vga: io write 3c0: address mode reg=20
bochs: *** io read 3c5 case 1: sequencer clocking mode
bochs: vga: io write: 3cf: reg 05: value = 10h
bochs: *** io read 3c5 case 1: sequencer clocking mode
bochs: vga: io write: 3cf: reg 05: value = 10h
bochs: vga: io write: 3da: ignoring: feature ctrl & vert sync
bochs: *** io read 3c5 case 1: sequencer clocking mode
bochs: vga: io write 3c0: address mode reg=16
bochs: vga: io write 3c0: address mode reg=17
bochs: vga: io write 3c0: address mode reg=18
bochs: vga: io write 3c0: address mode reg=19
bochs: vga: io write 3c0: address mode reg=20
bochs: *** io read 3c5 case 1: sequencer clocking mode
bochs: vga: io write: 3cf: reg 05: value = 10h
bochs: *** io read 3c5 case 1: sequencer clocking mode
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
floppy io: cylinder request != current cylinder
bochs: floppy: DMA and interrupt capabilities disabled
bochs: KBD: LED status set to 00
::ESC3:
::ESC7:
::ESC1:
::sysIOOut: No handler defined for port 0xCF8!.
::sysIOIn: No handler defined for port 0xCFC.
::sysIOIn: No handler defined for port 0xC000.
::sysIOIn: No handler defined for port 0xC100.
::sysIOIn: No handler defined for port 0xC200.
::sysIOIn: No handler defined for port 0xC300.
::sysIOIn: No handler defined for port 0xC400.
::sysIOIn: No handler defined for port 0xC500.
::sysIOIn: No handler defined for port 0xC600.
::sysIOIn: No handler defined for port 0xC700.
::sysIOIn: No handler defined for port 0xC800.
::sysIOIn: No handler defined for port 0xC900.
::sysIOIn: No handler defined for port 0xCA00.
::sysIOIn: No handler defined for port 0xCB00.
::sysIOIn: No handler defined for port 0xCC00.
::sysIOIn: No handler defined for port 0xCD00.
::sysIOIn: No handler defined for port 0xCE00.
::sysIOIn: No handler defined for port 0xCF00.
::sysIOOut: No handler defined for port 0x176!.
::sysIOIn: No handler defined for port 0x176.
::sysIOOut: No handler defined for port 0x1EE!.
::sysIOIn: No handler defined for port 0x1EE.
::sysIOOut: No handler defined for port 0x16E!.
::sysIOIn: No handler defined for port 0x16E.
bochs: floppy: DMA and interrupt capabilities disabled
bochs: initialize drive params
bochs: sector count = 63
bochs: drive select = 0
bochs: head number = 15
::CV=CDFF
::CV=CDFF
::CV=CB43
::CV=CB43
::call_pro: type = 12
::plex86 panic:
::call_pro: type = 12
Fatal monitor error caused Panic
eax:0xffffffe4
ebx:0x0
ecx:0x80ad0e0
edx:0xe0ff0000
ebp:0xbfffff5c
esi:0xbfffff80
edi:0xbfffff98
esp:0xbfffff24
eflags:0x286
eip:0x80813e5
cs:s=0x17, dl=0x0, dh=0xccfa00, valid=1
ss:s=0x1f, dl=0x0, dh=0xccf300, valid=1
ds:s=0x1f, dl=0x0, dh=0xccf300, valid=1
es:s=0x1f, dl=0x0, dh=0xccf300, valid=1
fs:s=0x1f, dl=0x0, dh=0xccf300, valid=1
gs:s=0x1f, dl=0x0, dh=0xccf300, valid=1
ldtr:s=0x18, dl=0x8960001f, dh=0xc0008217, valid=1
tr:s=0x20, dl=0x4df02068, dh=0xc0008917, valid=1
gdtr:base=0xc0177900, limit=0x57
idtr:base=0xc01789a0, limit=0x27f
dr0:0x0
dr1:0x0
dr2:0x0
dr3:0x0
dr6:0xffff0ff0
dr7:0x400
tr3:0x0
tr4:0x0
tr5:0x0
tr6:0x0
tr7:0x0
cr0:0xe001003f
cr1:0x0
cr2:0xbfffff98
cr3:0x277000
cr4:0x0
inhibit_mask:0
Thanks,
Marcus
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org [EMAIL PROTECTED]
Marcus Brinkmann GNU http://www.gnu.org [EMAIL PROTECTED]
[EMAIL PROTECTED]
http://www.marcus-brinkmann.de
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