ARM EN0-001 Online Practice Questions and Exam Preparation

ARM EN0-001 Online Questions & Answers

• Question 91:

  In a hardware system that runs software providing secure systems, which of the following describes the behavior of external memory and peripherals?

  A. They are not accessible when the processor is in Non-secure state
  B. They cannot know whether the processor is performing a Secure or Non-secure access
  C. They can use the Secure or Non-secure status of the access to decide what response to give
  D. They are required to give an ERROR response when Secure code accesses Non-secure locations in memory
  C. They can use the Secure or Non-secure status of the access to decide what response to give

• Question 92:

  The ARMv7-A virtual memory management system supports 32-bit (short) and 64-bit (long) page table descriptors. The sizes of a small page in a short descriptor and a small page in a long descriptor are:

  A. 1 KB and 4KB respectively
  B. 4KB and 4KB respectively
  C. 4KB and 16KB respectively
  D. 16KB and 16KB respectively
  B. 4KB and 4KB respectively

• Question 93:

  Which is the best power saving mode to use while waiting to obtain a lock on a semaphore?

  A. Dormant
  B. Standby
  C. Shutdown
  D. Deep sleep
  B. Standby

• Question 94:

  Under which of the following circumstances is TLB maintenance always required?

  A. If a TLB miss occurs
  B. On every process switch
  C. If the TLB reports a fault
  D. When a page table entry is changed
  D. When a page table entry is changed

• Question 95:

  The following C function is compiled with hard floating point linkage.

  float function(int a, float b, int c, float d);

  Which register is used to pass argument c?

  A. R0
  B. R1
  C. R2
  D. R3
  B. R1

• Question 96:

  If a Generic Interrupt Controller (GIC) implements 64 priority levels, which priority field bits hold the priority value?

  A. bits [5:0]
  B. bits [7:2]
  C. bits [15:10]
  D. bits [31:26]
  B. bits [7:2]

• Question 97:

  When a linker is removing unused sections during a static link (for example, -remove or -gc- sections), it finds the sections to keep by following all relocations starting from:

  A. The entry point(s).
  B. The function named 'main'.
  C. All local functions and variables.
  D. The reset vector.
  A. The entry point(s).

• Question 98:

  The Cortex-A9 processor implements a feature called "small loop mode" which reduces power consumption when executing small loops by turning off instruction cache accesses. Which of the following statements describes a condition that must be satisfied for this mode to be enabled?

  A. The loop must fit into two cache lines
  B. The loop must only contain forward branches
  C. Only integer arithmetic can be used
  D. All variables must be held in registers
  A. The loop must fit into two cache lines

• Question 99:

  A 32KB 4-way set associative instruction cache supports a cache line size of 64 bytes. How many bits are required to index a cache line in a way?

  A. 6 bits
  B. 7 bits
  C. 9 bits
  D. 15 bits
  B. 7 bits

• Question 100:

  How many bytes of stack are needed to pass parameters when calling the following function? int foo( short arg_a, long long arg_b, char arg_c, int arg_d )

  B. 4
  C. 8
  D. 15
  C. 8