Tài liệu Linux Device Drivers-Chapter 2 : Building and Running Modules pptx

... under version 2. 0 of the kernel. This should not be a problem because multiprocessor support was not very robust in Linux 2. 0, and everyone running SMP systems should be using 2. 2 or 2. 4. Because ... an integer; l, a long; and s, a string. In the case of string values, a pointer variable should be declared; insmod will allocate the Chapter 2 : Building and Running Modules It's high ... parameters. MODULE_PARM makes module parameters much cleaner and safer, but also makes Linux 2. 2 modules incompatible with 2. 0 kernels. If 2. 0 compatibility is a concern, a simple preprocessor test...

Tài liệu Linux Device Drivers-Chapter 6 : Flow of Time pptx

... kernel functions udelay and mdelay serve this purpose. [27 ] Their prototypes are [27 ] The u in udelay represents the Greek letter mu and stands for micro. #include < ;linux/ delay.h> void ... architecture-dependent value defined in < ;linux/ param.h>. Current Linux versions define HZ to be 100 for most platforms, but some platforms use 1 024 , and the IA-64 simulator uses 20 . Despite what your preferred ... Linux offers three different interfaces for this purpose: task queues, tasklets (as of kernel 2. 3.43), and kernel timers. Task queues and tasklets provide a flexible utility for scheduling...

Tài liệu Linux Device Drivers-Chapter 11 : kmod and Advanced docx

... subsystem. Version Control in Modules One of the main problems with modules is their version dependency, which was introduced in Chapter 2, " ;Building and Running Modules& quot;. The need to ... of demand loading of modules has changed significantly over time. This chapter discusses the 2. 4 implementation, as usual. The sample code works, as far as possible, on the 2. 0 and 2. 2 kernels ... operations) and symbols are defined differently for SMP kernels, it is important that modules and the kernel agree on whether they are built for SMP. Version 2. 4 and recent 2. 2 kernels throw...

Tài liệu Linux Device Drivers-Chapter 13 :mmap and DMA pptx

... 0000000000000000 0 0:0 0 0 # stack 0000000 120 000000-0000000 120 014000 r-xp 0000000000000000 0 8:0 3 28 44 # text 0000000140000000-00000001400 020 00 rwxp 0000000000014000 0 8:0 3 28 44 # data 00000001400 020 00-0000000140008000 ... 08050000-08054000 rwxp 00000000 0 0:0 0 0 # zero-mapped bss 40000000-40013000 r-xp 00000000 0 8:0 1 39003 /lib/ld -2. 1.3.so # text 40013000-40014000 rw-p 000 120 00 0 8:0 1 39003 /lib/ld -2. 1.3.so # data 40014000-40015000 ... list summarizes the implementation of the three levels in Linux, and Figure 13 -2 depicts them. Figure 13 -2. The three levels of Linux page tables Page Directory (PGD) The top-level page...

Tài liệu Security Essentials Day 2 Threat and the Need for Defense in Depth docx

... hour because their logons will not be recorded.1 - 22 Defense in Depth - SANS 20 01 22 Determine Running ServicesKnowing what services are running on a system helps the attacker focus their ... the confidentiality of the system.1 - 19Defense in Depth - SANS 20 0119Null Sessionnet use \\1 72. 20 .24 4.164\IPC$ “” /USER:””The null session exploit is an attack against confidentiality. ... 2 Defense in Depth - SANS 20 01 2 Defense in DepthWe have covered: perimeter defense, vulnerability scanning, host and network intrusion detection, honeypots/honeynets and risk assessment; is...

Tài liệu Linux Device Drivers-Chapter 1 :An Introduction to Device Drivers ppt

... kernel programming. Chapter 2, " ;Building and Running Modules& quot; introduces modularization, explaining the secrets of the art and showing the code for running modules. Chapter 3, "Char ... show is designed to compile and run on a wide range of kernel versions; in particular, it has all been tested with version 2. 4.4, and, where applicable, with 2. 2.18 and 2. 0.38 as well. This text ... linked with (as explained in Chapter 2, " ;Building and Running Modules& quot;, in the section "Version Dependency", and Chapter 11, "kmod and Advanced Modularization",...

Tài liệu Linux Device Drivers-Chapter 3: Char Drivers docx

... /dev/$ {device} [0-3] major=`awk "\\ $2= =\"$module\" {print \\$1}" /proc/devices` mknod /dev/$ {device} 0 c $major 0 mknod /dev/$ {device} 1 c $major 1 mknod /dev/$ {device} 2 ... sequential or random-access device, one device or many, and so on. To make scull be useful as a template for writing real drivers for real devices, we'll show you how to implement several device ... count for the device so that the module won't be unloaded before the file is closed. The count, described in "The Usage Count" in Chapter 2, " ;Building and Running Modules& quot;,...

Tài liệu Linux Device Drivers-Chapter 4 : Debugging Techniques pptx

... eip: c48370c3 *pde = 00000000 Oops: 00 02 CPU: 0 EIP: 001 0:[ <c48370c3>] EFLAGS: 0001 028 6 eax: ffffffea ebx: c 228 1a20 ecx: c48370c0 edx: c 228 1a40 esi: 4000c000 edi: 4000c000 ebp: ... 001 0:[ faulty:faulty_write+3/576] EFLAGS: 0001 028 6 eax: ffffffea ebx: c2c55ae0 ecx: c48370c0 edx: c2c55b00 esi: 0804d038 edi: 0804d038 ebp: c2337f8c esp: c2337f8c ds: 0018 es: 0018 ss: 0018 Process cat (pid: 23 413, stackpage=c2337000) ... 4000c000 ebp: c38adf8c esp: c38adf8c ds: 0018 es: 0018 ss: 0018 Process ls (pid: 23 171, stackpage=c38ad000) Stack: 0000010e c01356e6 c 228 1a20 4000c000 0000010e c 228 1a40 c38ac000 \ 0000010e...

Tài liệu Linux Device Drivers-Chapter 5 : Enhanced Char Driver Operations pptx

... Seeking in Linux 2. 0 Prior to Linux 2. 1, the llseek device method was called lseek instead, and it received different parameters from the current implementation. For that reason, under Linux 2. 0 ... write drivers compatible with 2. 0 and 2. 2 usually end up defining separate implementations of the seek method for the two interfaces. 2. 0 and SMP Because Linux 2. 0 only minimally supported ... handle than ioctl. Nonetheless, sometimes it's a useful approach to device control and is used by tty's and other devices. We'll describe it later in this chapter in "Device...

Tài liệu Linux Device Drivers-Chapter 7 : Getting Hold of Memory doc

... 0:c262b000 1:c2193000 rudo% cat /tmp/bigfile > /dev/scullv0; head -5 /proc/scullvmem Device 0: qset 500, order 4, sz 1048576 item at c4184b80, qset at c71c4000 0:c881a000 1:c882b000 ... will fail. The maximum value of order was 5 in Linux 2. 0 (corresponding to 32 pages) and 9 with later versions (corresponding to 5 12 pages: 2 MB on most platforms). Anyway, the bigger order ... 1:e000000 024 778000 salma% cat /tmp/bigfile > /dev/scullv0; head -5 /proc/scullvmem Device 0: qset 500, order 4, sz 1048576 item at e0000000303699c0, qset at e000000 025 c87000 0:a000000000034000...

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