virtio drivers

vm_area_struct *vma, unsigned long virt_addr, unsigned long phys_addr, unsigned long size, pgprot_t prot); Vma Virtual Memory Area Virt_addr The starting user virtual address when remapping Pfn The page frame number corresponding to the physical memory that the virtual memory will be mapped to The page frame number simply shifts the physical address to the right page_shift bit

) { - for(Throwable t:e) { + t.printstacktrace (); A } at } - } - - - Public Static voidRuntest ()throwsSQLException, IOException { - Try(Connection conn =getconnection ()) { inStatement stat =conn.createstatement (); -ResultSet rs = stat.executequery ("SELECT * FROM Authors"); to + while(Rs.next ()) { -System.out.println (rs.getstring ("last_name") + "" + rs.getstring ("first_name")); the } *

This example is for Android up-Reading Exploration (vol. 1): The Demo sample program included with the HAL and Driver Development book. are now pasted out for inspection.Terminal operations, commands that may be used:Insmond Word_count.kolsmod | grep Word_count to see if the driver was successfully installed Rmmod WORD_COUNTDMESG | grep word_cout | Tail-n 2 View log information with Linux driver output Cat/var/log/syslong | grep Word_count | Tail-n 2modinfo Word_count.ko View driver informationD

; Init_list_head (list); List_head (list); List_add (struct list_head *new, struct list_head *head); List_add_tail (struct list_head *new, struct list_head *head); List_del (struct list_head *entry); List_del_init (struct list_head *entry); List_move (struct list_head *entry, struct list_head *head); List_move_tail (struct list_head *entry, struct list_head *head); List_empty (struct list_head *head); List_splice (struct list_

Skb_release_data function has 0xc4 so large, and oops occurs at 0x74 place. So let's take a look at where the Skb_release_data starts:#grep Skb_release_data./system.mapC0282AF4 T Skb_release_dataSo we know that when the system error occurs, the program pointer is c0282af4+0x74=c0282b68(2) Then use GDB to view the GDB./vmlinux (executed under the Linux directory) and enter debug mode.gdb$ b *0xc0282b68Breakpoint 1 at 0xc0282b68:file NET/CORE/SKBUFF.C, line312This is to tell us in which file, in

will have to also." ”3, see example Drive, Linux kernel driver, generally have a relatively simple example code, specifically, see the first step of the TXT document. With this simple example code, we further clarify how the drive works.4, good, ready to work to complete, here should formally start. Write it yourself? No, or secretly lazy, online to find ready-made, there is just your chip driver, really lucky, direct use, of course, often can not be used directly, to debug under the next line.

code under default and clean starts with the TAB key.Third, compile the Globalvar modulePut the previous globalvar.c file and the makefile file in the same folder, I was placed in the Globalvar folder I created, go to the Globalvar folder, open the terminal, and then log in root permissions, enter the make command compile module. Four, write the test program of the Globalvar module, name it test_globalvar.c, the source code is as follows: #include Compile the test file in the terminal input Di

this driver"10. When the driver installation succeeds, you can see that the output of the debug message "Hello from Pnpdriver", the output statement you can find in the DriverEntry function of your source code.11. To end the debugging, remember to click "Debug"-"End debugging".12. The next time you continue debugging without restarting the virtual machine, you can use the built-in pipeline directly. Hit a breakpoint below to try.13. Commissioning situation:Problem Collection1. There are no VISU

, depending on the break flags to determine whether the send is completed or accepted.static irqreturn_t dm9000_interrupt (int irq, void *dev_id){if (Int_status ISR_PRS)-accepts data interrupts.Dm9000_rx (Dev);if (Int_status isr_pts)Dm9000_tx_done (dev, db);}static void Dm9000_tx_done (struct net_device *dev, board_info_t * db){Netif_wake_queue (Dev); --wake-up waiting queue}2.5 Data AcceptanceFor data acceptance, the data is actually read from the media buffer and then submitted to the upper

atomic variable, assigned a value of 1*/ Static intXxx_open (structInode *inode,structFile *Filp) { ... if(!atomic_dec_and_test (xxx_available))/*A test value of 0 returns true otherwise false*/{atomic_inc (xxx_available); return-Ebusy;/*has been opened*/ } ... return 0;/*Success*/ } Static intXxx_release (structInode *inode,structFile *Filp) {Atomic_inc (xxx_available);/*releasing the device*/ return 0; }Spin lockspinlock_t lock; /* Definition */Spin_lock_init (

Import SysImport OSImport ShutilImport timeOs.system (' pip install Selenium ')File_name= "IEDriverServer.exe"#获取路径Python_path=os.path.dirname (sys.executable)system_path=os.environ[' windir ']+ ' \\system32 '#安装IEDriverServerdesc_py_path=python_path+ "\" +file_namedesc_sys_path=system_path+ "\" +file_nameShutil.copyfile (File_name,desc_py_path)Shutil.copyfile (File_name,desc_sys_path)Print ("Selenium plugin and driver already installed!!!" ")Install selenium plug-ins and

int Dma_map_device (struct device *dev,struct scatterlist *sg, int nents,enum dma_data_directiondirection); There can be a relatively simple way to pre-allocate buffers in a Linux system, which is to synchronize the "mem=" parameter to reserve memory. For example, for a system with a memory of 64MB, passing the MEM=62MB command-line argument to it allowsThe top 2MB memory is reserved for use as IO memory, this 2MB memory can be statically mapped, can also execute Ioremap ().As wi

1. Write Linux device driver, require engineers have a certain hardware foundation, know how SRAM, Flash, SDRAM, disk read and write,The interface of UART, I²c, USB and other devices, polling, interrupt, DMA principle, PCI bus working mode and CPU memory management MMU.2. Have a good C language Foundation, can flexibly use the structure, pointers, function pointers and memory dynamic application and release.3. Have a certain Linux kernel base, at least understand the interface between the driver

w764-bit flagship installation problem we must all have heard of it, and for Windows7 after the long-term use of various problems, you may not get the greatest degree of understanding, and due to the WINDOWS7 installation process defects, Making Windows7-driven problems appear in the process of gradual use. 1, the first thing to understand is what the Windows7 drive, these drivers are including graphics cards, sound cards, network cards, inclu

Small series has been introduced before, many of the computer's patch information, as well as services are automatically updated to download and install the system, which can help users save a lot of time, but also will make the system will never stand "imperfect" realm, but for some computers, Downloading some unnecessary program drivers will be a burden on the computer, become a CPU "do not poop" culprit, or cause the driver and computer incompatibi

Have you ever had this experience in the Win7 system, when connected to a computer with a mobile phone or a USB drive, the system automatically searches for and installs the driver, which looks convenient, but if the system finds an incompatibility it is inconvenient and requires a variety of operations to remove the incompatible driver. In order to be more convenient to use, we can choose to prohibit automatic installation of drivers. 1. Start Menu-

3 ways to prevent WINDOWS7 system from automatically installing drivers: Method 1: "Start"-"Device and printer", or look in the control panel below Right-click the computer icon and select "Device installation Settings" In the pop-up window select No, the selection method and method of the same Method 2: Right-on the desktop, "Computer"-"Properties" Select Advanced system settings on the Left tab, switch to the Hardware tab, and select the second

Distory function*/ int Cleanup_module () { PRINTK ("I'll shut down myself in Kernerl mod/n)"; RETUTN 0; }Such an example is done. We also write a makefile example to fit our application in large program heavy applications. This is the content of the Makfile file. # A Makefile for a module cc=gcc modcflags:=-wall _dmodule-d_kernel_-dlinux HELLO.O Hello.c/usr/inculde? Linux/version.h CC $ (modcflags) 0c hello.c echo the module is Complie completely Then you run make command to get hello.o this mo

, released in 1969, is the most widely used serial interface for embedded systems and is designed to connect DTE (data Terminal equipment) with DCE (data communication devices). The RS-232 standard interface has 25 interfaces (4 data lines, 11 control lines, 3 timing lines, 7 spare and undefined lines), only 9 are commonly used, they are rts/cts (request send/clear Send flow control), RXD/TXD (data transmit/receive), DSR/DTR (Data Terminal ready/ Data set Ready flow control), DCD (Data carrier d

1. Upload the downloaded driver to the ESXi storage to be upgraded2. Open the SSH function of ESXi host3. list The status of all NICs on the current ESXi hostESXCLI Network NIC List650) this.width=650; "src=" Https://s2.51cto.com/wyfs02/M01/A5/17/wKioL1m3l_fzb4trAAFTfnHDfG4713.png "title=" 2323. PNG "alt=" Wkiol1m3l_fzb4traaftfnhdfg4713.png "/>4. Check the driver version and firmware version of the NICESXCLI Network Nic Get-n vmnic2Advertised Auto Negotiation:falseAdvertised Link Modes:10000base