Embedded FreeBSD cookbook by Paul Cevoli

By Paul Cevoli

A whole waste of time and cash. This ebook is misrepresented in what it claims to be approximately. It includes little or no details particular to embedded FreeBSD.

The writer must have written even more approximately minimizing the kernel, proscribing reminiscence utilization, machine motive force improvement, and flash garage concerns - simply because those are the themes which are the main relevent to an embedded approach. The dialogue approximately utilizing Tomcat, JSP, and JNI to supply internet entry to an embedded equipment - whereas vital - is critically lacking.

A strong booklet approximately an embedded working approach will discover the issues and trade-offs platforms developer should make. it's going to additionally speak about getting the OS to run on a unmarried board computing device - akin to one of many devboards indexed within the FreeBSD ARM undertaking. This publication does neither.

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The main Program The copymem program handles initialization and command parsing. Since the copymem system call is a KLD and the system call number is dynamically assigned, the system call number must be determined by querying the kernel module subsystem. This can be accomplished by calling modfind and modstat. The modfind call takes the name of a kernel module; the copymem system call is named copymem; modfind returns the module ID. h> int modfind(const char *modname); Once we have the module ID, modstat is called to obtain the module_stat structure.

The write command takes two parameters, the kernel address and a length. The maximum size of a write is 4096 bytes defined by the BUFFER_MAX macro. This maximum is an arbitrary value. = 0) { printf(“syscall failed\n”); } } Listing 3-15 44 Embedded FreeBSD Cookbook After parsing the write parameters, the write command accepts additional input from the user, the data to write to the location. Once the data is input, the write handler calls the copymem system call to write the kernel memory. Quit Handler The quit handler is used to clean up and exit the program.

When a KLD system call is made, a new entry is added to the kernel global sysent structure. Listing 3-8 contains a partial listing of the sysent structure. /* The casts are bogus but will do for now. */ struct sysent sysent[] = { { 0, (sy_call_t *)nosys }, /* 0 = syscall */ { AS(rexit_args), (sy_call_t *)exit }, /* 1 = exit */ { 0, (sy_call_t *)fork }, /* 2 = fork */ { AS(read_args), (sy_call_t *)read }, /* 3 = read */ { AS(write_args), (sy_call_t *)write }, /* 4 = write */ { AS(open_args), (sy_call_t *)open }, /* 5 = open */ { AS(close_args), (sy_call_t *)close }, /* 6 = close */ Listing 3-8 The System Call Number A system call number must be declared; since there is no system call num­ ber defined, this value should be set to NO_SYSCALL.

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