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The Linux Kernel Primer: A Top-Down Approach for x86 and by Claudia Salzberg Rodriguez

By Claudia Salzberg Rodriguez

The LinuxR Kernel Primer is the definitive advisor to Linux kernel programming. The authors' specified top-down method makes kernel programming more straightforward to appreciate through systematically tracing performance from person area into the kernel and punctiliously associating kernel internals with user-level programming basics. Their process is helping you construct on what you understand approximately Linux, gaining a deep realizing of ways the kernel works and the way its parts healthy together.One step at a time, the authors introduce the entire instruments and meeting language programming suggestions required to appreciate kernel code and keep watch over its habit. They examine x86 and PowerPC implementations side-by-side, illuminating cryptic performance via carefully-annotated resource code examples and practical tasks. The LinuxR Kernel Primer is the 1st publication to provide in-depth assurance of the quickly turning out to be PowerPC Linux improvement platform, and the single e-book to completely talk about kernel configuration with the Linux construct method.

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Additional resources for The Linux Kernel Primer: A Top-Down Approach for x86 and PowerPC Architectures

Example text

Storage access instructions access byte, half-word, word, and double-word data in Big Endian ordering. With Extended Mnemonics, there are many load, store, arithmetic, and logical fixed-point instructions, as well as special instructions to move to/from system registers. 3. Floating-Point Instructions Floating-point instructions can be broken down into two categories: computational, which includes arithmetic, rounding, conversion, and comparison; and non-computational, which includes move to/from storage or another register.

Recent extensions to Intel and AMD architectures, such as MMX, SSE, 3DNow, SIMD, and SSE2/3, greatly enhance math-intensive applications, such as graphics and audio. You are directed to the programming manuals for their respective architectures. 3. Data Instructions Data can be moved between registers, between registers and memory, and from a constant to a register or memory, but not from one memory location to another. Examples of these are as follows: ----------------------------------------------------------------------100 mov eax,ebx 101 mov eax,WORD PTR[data3] 102 mov BYTE PTR[char1],al 103 mov eax,0xbeef 104 mov WORD PTR [my_data],0xbeef ----------------------------------------------------------------------- Line 100 Move 32 bits of data from ebx to eax.

52 53 Line 24 Load i into r9. Line 25 Add 1 to r9 and store in r0. Line 26 Store r0 into i. L2. L3:. Line 29 Load 0 into r0. Line 30 Move r0 to r3. Line 31 Load r1 into r11. Line 32 Restore r31. Line 33 Restore r1. Line 34 This is an unconditional branch to the location indicated by Link Register contents. Contrasting the two assembler files, they have nearly the same number of lines. Upon further inspection, you can see that the RISC (PPC) processor is characteristically using many load and store instructions while the 53 54 CISC (x86) tends to use the mov instruction more often.

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