Practice Exam 2, Problem 3: From Reset to kmain

Midterm 1 practice exam 2, problem 3 of 5 · Length: 11:42 · Exercises: 31k_boot (Week 7), with 21r_unsafe_bridge and 30k_kernel_basics (Week 6) · Answer key: Solutions (PDF)

Worked on pages 11 to 14, with the kernel's layout kept beside the work: (a) the boot trampoline's register table, where kmain saves ra, and why sp starts at the top of STACK0; (b) an _entry without its add: where the stack lands, what it overwrites, and why the passing test proves nothing; (c) the UART's stores for a short string, exit_failure, the value it stores, and the error without its loop. The answer key's handwriting is written onto the exam page as each step is worked.

Download the video (MP4, 43 MB) · Captions (WebVTT) · All five problems