Kevin O'Connor wrote:
On Tue, Apr 13, 2010 at 02:26:10PM +0800, Roy Tam wrote:
2010/4/12 Gerhard Wiesinger <li...@wiesinger.com>:
3.) There is also a problem with the reported base memory under QEMM386
(HIMEM.SYS and EMM386.EXE is correct here). It is 646kB instead of 640kB.
Therefore base memory test fails. I guess that reporting memory CMOS
tables/interrupt functions are not implemented correctly.
- The Base Memory > 640K error seems to be SeaBIOS related. QEMU Bochs
BIOS(tested with both -old-bios hack in 0.12 series and old 0.11.1)
will just freeze after QEMU counted RAM.(Tested with ScriptPC and
Bochs).
The SeaBIOS log would really help. This can be done by adding:
-chardev stdio,id=seabios -device isa-debugcon,iobase=0x402,chardev=seabios
to the qemu command line.
The memory can be obtained in several places (int 12, int 1588, int
15e801, int 15e820, and mem 40:13). All look fine to me from looking
at the code.
OK, I made some research on the topic. Problem is that QEMM pushes the
Extended BIOS data area to High RAM on some machines (QEMU, P733).
Therefore 640k low memory is available and checkit reports 640kB +
6kB=646kB EBIOS DATA AREA. Whats strange that on a physical Pentium 733
machine this works correctly (details see below and attached files),
maybe someone can try to find the problem with QEMM+Checkit 3.0 (maybe
there is still some other BIOS function incorrectly implemented). QEMM
parameter NOXBDA avoids moving the XBDA up to HI RAM and therefore
checkit reports 640kB well.
SeaBIOS seems to be correct (see below and attached patch files and
description below).
Total Memory: 256MB (262144kB), Base RAM: 637kB
Extended BIOS Data Area size: 3 kB, segment=9f40
SCSI option ROM:
After option ROMS, Total Memory: 256MB (262144kB), Base RAM: 634kB
Extended BIOS Data Area size: 6 kB, segment=9e80
*MS-DOS 6.22, QEMM 8.03*
*QEMU*
*Testcase*
*BDA*
*40h:13h*
*INT*
*12h*
*INT 15h,*
*AX=E820h*
*EBIOS*
*DATAAREA*
*Checkit*
*3.0*
Plain DOS, after Boot
634kB
634kB
634kB
9E80h-A000h (6k)
640kB
HIMEM.SYS+EMM386.EXE
634kB
634kB
634kB
9E80h-A000h (6k)
640kB
QEMM
640kB
640kB
634kB
CEB5h-D035h (6k)
646kB
QEMURAMD + QEMM
628kB
628kB
634kB
9E80h-A000h (6k)
634k
*VMWare*
*Testcase*
*BDA*
*40h:13h*
*INT*
*12h*
*INT 15h,*
*AX=E820h*
*EBIOS*
*DATAAREA*
*Checkit 3.0*
Plain DOS, after Boot
638kB
638kB
638kB
9F80h-A000h (2k)
640kB
HIMEM.SYS+EMM386.EXE
638kB
638kB
638kB
9F80h-A000h (2k)
640kB
QEMM
638kB
638kB
638kB
9F80h-A000h (2k)
640kB
QEMURAMD + QEMM
632kB
632kB
632kB
9F80h-A000h (2k)
634kB
*Pentium 733*
*Testcase*
*BDA*
*40h:13h*
*INT*
*12h*
*INT 15h,*
*AX=E820h*
*EBIOS*
*DATAAREA*
*Checkit 3.0*
Plain DOS, after Boot
639kB
639kB
639kB
9FC0h-A000h (1k)
640kB
QEMM
640B
640kB
639kB
D1B5h- (1k)
640kB
Attached documents:
MEQEMU.TXT QEMU, no CONFIG.SYS/AUTOEXEC.BAT
MEQEMUH.TXT QEMU, HIMEM.SYS, EMM386.EXE
MEQEMUQ1.TXT QEMU, QEMM386.EXE, NOXBDA parameter
MEQEMUQ2.TXT QEMU, QEMM386.EXE
MEVMW.TXT VMWare, no CONFIG.SYS/AUTOEXEC.BAT
MEVMWH.TXT VMWare, HIMEM.SYS, EMM386.EXE
MEVMWQ.TXT QEMU, QEMM386.EXE (XBDA not moved to HMA!?!)
P733.TXT, Pentium 733, no CONFIG.SYS/AUTOEXEC.BAT
P733Q.TXT Pentium 733, QEMM386.EXE
Code and Patches can be found at (released under GPL V2):
http://www.wiesinger.com/opensource/seabios/meminfoa.asm
http://www.wiesinger.com/opensource/seabios/meminfo.c
http://www.wiesinger.com/opensource/seabios/meminfo.exe
http://www.wiesinger.com/opensource/seabios/seabios-0.6.0-gw-V01.patch
QEMURAMD: DOS Device driver, which modifies BDA reported memory by -6kB,
released later.
Build script will be released under my DOS-Tools soon (some cleanup
necessary).
Ciao,
Gerhard
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=640, 640kB
INT 12h: AX=640, 640kB
INT 15h, AH=88h
AX=0, number of continuous kB starting at absolute address 100000h: 0kB
INT 15h, AX=E801h
AX=15360, extended memory between 1M and 16M: 15360kB
BX=3840, extended memory above 16M, in 64K blocks: 245760kB
CX=15360, configured memory between 1M and 16M: 15360kB
DX=3840, configured memory above 16M, in 64K blocks: 245760kB
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9E800h (649216), 634kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=B0B5h, memory=6kB
Device driver entry point=D1EEh:023Ch, Device flag 1st byte=00h, 2nd byte=83h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=638, 638kB
INT 12h: AX=638, 638kB
INT 15h, AH=88h
AX=64512, number of continuous kB starting at absolute address 100000h: 64512kB
INT 15h, AX=E801h
AX=15360, extended memory between 1M and 16M: 15360kB
BX=3823, extended memory above 16M, in 64K blocks: 244672kB
CX=15360, configured memory between 1M and 16M: 15360kB
DX=3823, configured memory above 16M, in 64K blocks: 244672kB
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9F800h (653312), 638kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=9F80h, memory=2kB
Device driver entry point=0000h:0000h, Device flag 1st byte=00h, 2nd byte=02h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=638, 638kB
INT 12h: AX=638, 638kB
INT 15h, AH=88h
AX=0, number of continuous kB starting at absolute address 100000h: 0kB
INT 15h, AX=E801h
AX=15360, extended memory between 1M and 16M: 15360kB
BX=3823, extended memory above 16M, in 64K blocks: 244672kB
CX=15360, configured memory between 1M and 16M: 15360kB
DX=3823, configured memory above 16M, in 64K blocks: 244672kB
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9F800h (653312), 638kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=9F80h, memory=2kB
Device driver entry point=CB02h:023Ch, Device flag 1st byte=00h, 2nd byte=C2h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=638, 638kB
INT 12h: AX=638, 638kB
INT 15h, AH=88h
AX=0, number of continuous kB starting at absolute address 100000h: 0kB
INT 15h, AX=E801h
AX=15360, extended memory between 1M and 16M: 15360kB
BX=3823, extended memory above 16M, in 64K blocks: 244672kB
CX=15360, configured memory between 1M and 16M: 15360kB
DX=3823, configured memory above 16M, in 64K blocks: 244672kB
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9F800h (653312), 638kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=9F80h, memory=2kB
Device driver entry point=02FFh:023Ch, Device flag 1st byte=00h, 2nd byte=C2h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=639, 639kB
INT 12h: AX=639, 639kB
INT 15h, AH=88h
AX=65472, number of continuous kB starting at absolute address 100000h: 65472kB
INT 15h, AX=E801h
Not successful
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9FC00h (654336), 639kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=9FC0h, memory=1kB
Device driver entry point=0000h:0000h, Device flag 1st byte=00h, 2nd byte=00h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=640, 640kB
INT 12h: AX=640, 640kB
INT 15h, AH=88h
AX=0, number of continuous kB starting at absolute address 100000h: 0kB
INT 15h, AX=E801h
Not successful
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9FC00h (654336), 639kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=D1B5h, memory=1kB
Device driver entry point=B11Bh:023Ch, Device flag 1st byte=00h, 2nd byte=82h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=634, 634kB
INT 12h: AX=634, 634kB
INT 15h, AH=88h
AX=64512, number of continuous kB starting at absolute address 100000h: 64512kB
INT 15h, AX=E801h
AX=15360, extended memory between 1M and 16M: 15360kB
BX=3840, extended memory above 16M, in 64K blocks: 245760kB
CX=15360, configured memory between 1M and 16M: 15360kB
DX=3840, configured memory above 16M, in 64K blocks: 245760kB
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9E800h (649216), 634kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=9E80h, memory=6kB
Device driver entry point=0000h:0000h, Device flag 1st byte=00h, 2nd byte=00h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=634, 634kB
INT 12h: AX=634, 634kB
INT 15h, AH=88h
AX=0, number of continuous kB starting at absolute address 100000h: 0kB
INT 15h, AX=E801h
AX=15360, extended memory between 1M and 16M: 15360kB
BX=3840, extended memory above 16M, in 64K blocks: 245760kB
CX=15360, configured memory between 1M and 16M: 15360kB
DX=3840, configured memory above 16M, in 64K blocks: 245760kB
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9E800h (649216), 634kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=9E80h, memory=6kB
Device driver entry point=08A9h:023Ch, Device flag 1st byte=00h, 2nd byte=83h
Memory Information V1.0, (c) 2009-2010 by Gerhard Wiesinger
BIOS area 40h:13h=634, 634kB
INT 12h: AX=634, 634kB
INT 15h, AH=88h
AX=0, number of continuous kB starting at absolute address 100000h: 0kB
INT 15h, AX=E801h
AX=15360, extended memory between 1M and 16M: 15360kB
BX=3840, extended memory above 16M, in 64K blocks: 245760kB
CX=15360, configured memory between 1M and 16M: 15360kB
DX=3840, configured memory above 16M, in 64K blocks: 245760kB
INT 15h, AX=E820h
structure len=20
base address 0h (0)
length in bytes 9E800h (649216), 634kB
type of address range: memory type=1
type of address range: memory type=memory, available to OS
EBDA - Extended BIOS Data Area information, found, segment=9E80h, memory=6kB
Device driver entry point=D1EEh:023Ch, Device flag 1st byte=00h, 2nd byte=83h
