* [Qemu-devel] The relationship of ide and bmdma in hw/ide module
@ 2014-03-21 7:24 Arthur Chunqi Li
0 siblings, 0 replies; only message in thread
From: Arthur Chunqi Li @ 2014-03-21 7:24 UTC (permalink / raw)
To: qemu-devel; +Cc: Jan Kiszka
Hi there,
I'm trying to record all the disk access in qemu. When I turned on the
DEBUG_IDE flag, I get debug message with "ide" and "bmdma" headers.
While trying to figure out the details, I record all the ioport access
and compared to guest's IO mapping.
Here's my qemu command:
qemu-system-x86_64 -vnc :1 -hda ubuntu64.12.04.3.img -m 512 -machine
pc,accel=kvm -cpu host -smp 4
Here's my guest VM's IO mapping:
root@kvm-ubuntu-1:~# cat /proc/ioports
0000-0cf7 : PCI Bus 0000:00
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-0060 : keyboard
0064-0064 : keyboard
0070-0071 : rtc0
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : 0000:00:01.1
0170-0177 : ata_piix
01f0-01f7 : 0000:00:01.1
01f0-01f7 : ata_piix
0376-0376 : 0000:00:01.1
0376-0376 : ata_piix
0378-037a : parport0
03f2-03f2 : floppy
03f4-03f5 : floppy
03f6-03f6 : 0000:00:01.1
03f6-03f6 : ata_piix
03f7-03f7 : floppy
03f8-03ff : serial
0cf8-0cff : PCI conf1
0d00-ffff : PCI Bus 0000:00
afe0-afe3 : ACPI GPE0_BLK
b000-b03f : 0000:00:01.3
b000-b003 : ACPI PM1a_EVT_BLK
b004-b005 : ACPI PM1a_CNT_BLK
b008-b00b : ACPI PM_TMR
b010-b015 : ACPI CPU throttle
b100-b10f : 0000:00:01.3
b100-b107 : piix4_smbus
c000-c0ff : 0000:00:03.0
c000-c01f : ne2k-pci
c100-c10f : 0000:00:01.1
c100-c10f : ata_piix
I found that "ide" related log are printed when accessing port
0x170~0x177, and "bmdma" related log are printed with port
0xc100~0xc10f.
Thus I get confused of guest OS accessing IDE device via BMDMA. What
is the relationship of IDE and BMDMA? What is the function call
routine when guest OS accesses the IDE device?
Besides, where can I get a detailed information of ATA/IDE programming guidance?
Thanks,
Arthur
--
Arthur Chunqi Li
Department of Computer Science
School of EECS
Peking University
Beijing, China
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