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In a raw Itanium, a "Processor Abstraction Layer" (PAL) is integrated into the system. When it is booted the PAL is loaded into the CPU and gives a low-level interface that abstracts some instructions and gives a mechanism for processor updates distributed via a BIOS update.
During BIOS initialization an additional layer of code, the "System Abstraction Layer" (SAL) is loaded that gives a uniform API for execution-specific platform functions.
On top of the PAL/SAL interface sits the "Extensible Firmware Interface" (EFI). EFI is not part of the IA-64 architecture but by convention it is needed on all IA-64 systems. It is a easy API for access to logical aspects of the system (display, storage, keyboard, etc) combined with a lightweight runtime environment (same to DOS) that allows basic system administration tasks such as configuring storage adapters, flashing BIOS and running an OS boot-loader.
Once the OS has been booted, some aspects of the PAL/SAL/EFI stack remain resident in memory and can be accessed by the OS to perform low-level tasks that are implementation-dependent on the underlying hardware.
What is model? A universe together with an assignment of relations to relation symbol is known as a model. A model M is a tuple (U, P1, P2..Pk), where U is the universe and P
Multithreading is the process in which more than single thread run independent of each other within the process in any programming language such as C, C++, etc.
What is graceful degradation? In multiprocessor systems, failure of one processor will not halt the system, but only slow it down by sharing the work of failure system by other
Q. Illustrate about Compact Disk Rewritable? CD-RW optical disk can be repeatedly written and overwritten same as with a magnetic disk. Even though a number of techniques have
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Q. Returns information about present virtual machine? int pvm_parent( void ) Returns the tid of process which spawned the calling process. int pvm_tidtohost(
Examples of declarations of external variables that are not definitions: extern char stack[10]; extern int stkptr; These declarations tell the compiler that the variab
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Action implementing instruction's meaning are a actually carried out by ? Ans. By instruction execution, the meaning of action implementing instruction is actually carried out.
What is compiler? A system software program known as a compiler translates the high-level language program into a suitable machine language program having instruction such as t
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