By Paul Cevoli
ISBN-10: 1589950046
ISBN-13: 9781589950047
A whole waste of money and time. This e-book is misrepresented in what it claims to be approximately. It comprises little or no details particular to embedded FreeBSD.
The writer must have written even more approximately minimizing the kernel, restricting reminiscence utilization, equipment motive force improvement, and flash garage matters - simply because those are the themes which are the main relevent to an embedded process. The dialogue approximately utilizing Tomcat, JSP, and JNI to supply internet entry to an embedded equipment - whereas very important - is critically lacking.
A sturdy publication approximately an embedded working method will discover the issues and trade-offs platforms developer should make. it's going to additionally talk about getting the OS to run on a unmarried board computing device - resembling one of many devboards indexed within the FreeBSD ARM venture. This e-book does neither.
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Additional info for Embedded FreeBSD cookbook
Example text
The maximum size of a read is 4096 bytes defined by the BUFFER_MAX macro. This maximum is an arbitrary value. = 0) { printf(“syscall failed\n”); return; } dumpmem(kerneladdr, iobuf, length); } Listing 3-14 43 Chapter Three System Calls After parsing the parameters, the call to copymem is made. Because copymem is a user-defined system call, the call is made using the syscall function. Write Handler The write command is used to write kernel memory. The write command takes two parameters, the kernel address and a length.
After the interrupt handler is completed, execution returns to the user process. process INT 0x80 User Space Kernel Space int 0x80 syscall syscall2 system call Figure 3-3. Interrupt Handling Passing Data The kernel implements many different system calls. To distinguish between different system calls, a number is passed that designates which system call is being made; this number is called the system call number. master. Before a sys tem call is made, the system call number is pushed onto the program stack.
Arg # n • • • arg 1 system call number Figure 3-4. System Call Number An Example To demonstrate how the compiler generates system calls, let’s look at the generated output of a program that makes a system call. Listing 3-1 contains a program that makes an open and close system call. dat”, O_RDWR); close(fd); } Listing 3-1 NOTE: In order to simplify the listed output, optimizations are turned off so the assembly code is easier to read, and the program is linked statically. c After the program in Listing 3-1 has been compiled and linked, we can use the objdump utility to disassemble the output to look at the compiler gener ated system calls.
Embedded FreeBSD cookbook by Paul Cevoli
by Michael
4.4