Okay kids, time for more multi-layer page table practice! Again let's look at a 15-bit virtual address, 32-byte pages and a two-level page table setup. A page table entry is one valid bit followed by a seven-bit page frame number; but there's a subtle difference this time: a page directory entry is *reversed* (seven-bit page frame number followed by one valid bit) so be careful! PDBR: decimal 48 pg 48: d9 99 8b ac 9c e5 85 f1 a2 e8 fe 9f 30 fe 65 f6 c9 eb da c8 d8 81 63 fe 93 a9 83 c3 f5 fb 91 97 pg 49: 7f 82 7f 7f 7f 7f 8f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 34 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f a3 7f 7f pg 50: 7f 7f 7f a8 7f 7f 7f 7f 99 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f b2 7f 7f 7f 7f 7f 7f 7f 7f 7f f6 7f pg 52: 48 65 79 20 79 6f 75 20 66 6f 75 6e 64 20 74 68 65 20 73 65 63 72 65 74 20 6d 65 73 73 61 67 65 pg 120: a2 81 01 0a 1a 0c 15 08 37 19 11 0f 1d 5e 05 0f 13 f4 0f 1f 1e 4e 13 1d 07 08 19 14 0c 1a 1b 0c The first VA to translate is 0x3875. What happens when you try to load this virtual address? (If valid, what do you get back?) The second VA to translate is 0x5a27. What happens when you try to load this virtual address? (If valid, what do you get back?) ****** I'll give quick answers to these at the end of class on Tuesday (2 October), so you have until then to work these out. I will NOT work them out in class again, so if you have questions come to office hours!! ******