Consider the following code snippet: #define TIMER_BASE 0x40010000 void configure_timer(){ uint32_t config_reg = (uint32_t)(TIMER_BASE + 0x00); uint8_t status_reg = (uint8_t)(TIMER_BASE + 0x04); uint16_t counter_reg = (uint16_t)(TIMER_BASE + 0x08); config_reg = 0x1; while((status_reg & 0x1) == 0); counter_reg = 0xFFFF; } What are the sizes of the config_reg, status_reg, and counter_reg registers, respectively?

(B) Sizes of ‘config_reg‘, ‘status_reg‘, and ‘counter_reg‘ are 4-byte, 1-byte, and 2- byte respectively.

(A) Sizes of all the registers are 4-byte.

(C) Sizes of ‘config_reg‘, ‘status_reg‘, and ‘counter_reg‘ are 2-byte, 1-byte, and 2- byte respectively.

(D) Sizes of ‘config_reg‘, ‘status_reg‘, and ‘counter_reg‘ are 1-byte, 2-byte, and 4- byte respectively.

Operating Systems · Quiz 1 · 23 Feb 2025 · January 2025 term

Question 2: Consider the following code snippet: What are the sizes o…

Question 2

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Consider the following code snippet:

1#define TIMER_BASE 0x40010000
2
3void configure_timer(){
4    uint32_t *config_reg = (uint32_t*)(TIMER_BASE + 0x00);
5    uint8_t *status_reg = (uint8_t*)(TIMER_BASE + 0x04);
6    uint16_t *counter_reg = (uint16_t*)(TIMER_BASE + 0x08);
7
8    *config_reg = 0x1;
9    while((*status_reg & 0x1) == 0);
10    *counter_reg = 0xFFFF;
11}

What are the sizes of the config_reg, status_reg, and counter_reg registers, respectively?

A
Sizes of all the registers are 4-byte.
B
Sizes of ‘config_reg‘, ‘status_reg‘, and ‘counter_reg‘ are 4-byte, 1-byte, and 2- byte respectively.
C
Sizes of ‘config_reg‘, ‘status_reg‘, and ‘counter_reg‘ are 2-byte, 1-byte, and 2- byte respectively.
D
Sizes of ‘config_reg‘, ‘status_reg‘, and ‘counter_reg‘ are 1-byte, 2-byte, and 4- byte respectively.

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Correct answer

B
Sizes of ‘config_reg‘, ‘status_reg‘, and ‘counter_reg‘ are 4-byte, 1-byte, and 2- byte respectively.

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Question 2 of 19 in the IIT Madras BS Operating Systems (Operating Systems) Quiz 1 paper sat on 23 Feb 2025, in the January 2025 term (IIT M IMPROVEMENT AN EXAM QIM2 23 Feb 2025). It carries 3 marks.

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