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FABRIC.md item 4.4t: confine REPL text rendering to the CANVAS box

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vt100's TTF-mode text grid now operates within the per-arch 640x480 box
(computed in 4.4o, pixel-verified in 4.4p) instead of the full framebuffer:
box-origin offset in px_of()/py_of(), box-derived cols/rows (53x20) set
before the 4.4q scrollback allocation depends on them, mode-aware
erase_display()/reverse-index fill, and a new box-scoped fb_scroll_rect()
alongside the existing whole-framebuffer fb_scroll_rows() (bitmap/boot mode
unaffected either way). Also clears the full framebuffer once at the
bitmap-to-TTF switch so leftover boot debris doesn't sit frozen outside the
box now that erase_display(2) is box-scoped afterward.

Three-arch QEMU boot + pixel-scanned screendumps confirm zero non-background
pixels land outside the box on amd64, aarch64, and riscv64.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-08-11 23:07:04 -04:00
co-authored by Claude Sonnet 5
parent 1f3ec3554e
commit c92be2768f
21 changed files with 91586 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files
experiments/bare_metal/latest/amd64.csv
+31 -31
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@@ -75,36 +75,36 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
1,10000,18446744073708831616,0,0,117,4,4,4096,0,0,4895412794951728796,13,65536,0,0,65536,0,0
2,20000,10000,0,0,78,10,7,4096,0,0,0,17,65536,0,0,65536,0,0
3,30000,10000,0,0,101,13,7,4096,0,0,0,21,65536,0,0,65536,0,0
4,40000,10000,0,0,63,19,8,4096,0,0,0,24,65536,0,0,65536,0,0
5,50000,10000,0,0,92,25,8,4096,2,0,0,30,65536,0,0,65536,0,0
6,60000,10000,0,0,64,27,8,4096,2,0,0,34,65536,0,0,65536,0,0
7,70000,10000,0,0,228,32,8,4096,210,0,0,113,65536,0,0,65536,0,0
8,80000,10000,0,0,256,34,9,4096,466,0,0,206,65536,0,0,65536,0,0
9,90000,10000,0,0,256,36,10,4096,722,0,0,304,65536,0,0,65536,0,0
4,40000,10000,0,0,63,19,8,4096,0,0,0,25,65536,0,0,65536,0,0
5,50000,10000,0,0,92,25,8,4096,2,0,0,31,65536,0,0,65536,0,0
6,60000,10000,0,0,64,27,8,4096,2,0,0,36,65536,0,0,65536,0,0
7,70000,10000,0,0,228,32,8,4096,210,0,0,115,65536,0,0,65536,0,0
8,80000,10000,0,0,256,34,9,4096,466,0,0,215,65536,0,0,65536,0,0
9,90000,10000,0,0,256,36,10,4096,722,0,0,310,65536,0,0,65536,0,0
10,100000,10000,0,0,256,36,11,4096,978,0,0,403,65536,0,0,65536,0,0
11,110000,10000,0,0,256,36,11,4096,1234,0,0,502,65536,0,0,65536,0,0
12,120000,10000,0,0,256,36,12,4096,1490,0,0,594,65536,0,0,65536,0,0
13,130000,10000,0,0,256,37,12,4096,1746,0,0,690,65536,0,0,65536,0,0
14,140000,10000,0,0,230,39,12,4096,1949,0,0,766,65536,0,0,65536,0,0
15,150000,10000,0,0,256,39,13,4096,2204,0,0,858,65536,0,0,65536,0,0
11,110000,10000,0,0,256,36,11,4096,1234,0,0,497,65536,0,0,65536,0,0
12,120000,10000,0,0,256,36,12,4096,1490,0,0,591,65536,0,0,65536,0,0
13,130000,10000,0,0,256,37,12,4096,1746,0,0,685,65536,0,0,65536,0,0
14,140000,10000,0,0,230,39,12,4096,1949,0,0,762,65536,0,0,65536,0,0
15,150000,10000,0,0,256,39,13,4096,2204,0,0,856,65536,0,0,65536,0,0
16,160000,10000,0,0,256,39,14,4096,2459,0,0,950,65536,0,0,65536,0,0
17,170000,10000,0,0,256,39,15,4096,2713,0,0,1042,65536,0,0,65536,0,0
18,180000,10000,0,0,256,39,15,4096,2969,0,0,1135,65536,0,0,65536,0,0
19,190000,10000,0,0,256,39,16,4096,3224,0,0,1228,65536,0,1,65536,0,0
20,200000,10000,0,0,256,41,17,4096,3480,0,0,1320,65536,0,1,65536,0,0
21,210000,10000,0,0,256,41,17,4096,3736,0,0,1412,65536,0,1,65536,0,0
22,220000,10000,0,0,256,41,18,4096,3992,0,0,1504,65536,0,1,65536,0,0
23,230000,10000,0,0,256,41,19,4096,4096,0,0,1598,65536,0,1,65536,0,0
24,240000,10000,0,0,256,41,20,4096,4096,0,0,1694,65536,0,1,65536,0,0
25,250000,10000,0,0,256,43,20,2048,2048,0,0,1788,65536,0,1,65536,0,0
26,260000,10000,0,0,256,45,21,2048,2048,0,0,1881,65536,0,1,65536,0,0
27,270000,10000,0,0,256,45,22,1024,1024,0,0,1978,65536,0,1,65536,0,0
28,280000,10000,0,0,256,45,23,1024,1024,0,0,2071,65536,0,1,65536,0,0
29,290000,10000,0,0,256,45,24,512,512,0,0,2164,65536,0,1,65536,0,0
30,300000,10000,0,0,256,45,24,512,512,0,0,2259,65536,0,1,65536,0,0
31,310000,10000,0,0,256,45,25,256,256,0,0,2351,65536,0,1,65536,0,0
32,320000,10000,0,0,255,45,26,256,256,0,0,2443,65536,0,1,65536,0,0
33,330000,10000,0,0,256,45,27,256,256,0,0,2536,65536,0,1,65536,0,0
34,340000,10000,0,0,256,45,27,256,256,0,0,2632,65536,0,1,65536,0,0
35,350000,10000,0,0,256,45,28,256,256,0,0,2726,65536,0,1,65536,0,0
36,360000,10000,0,0,256,45,29,256,256,0,0,2818,65536,0,1,65536,0,0
17,170000,10000,0,0,256,39,15,4096,2713,0,0,1045,65536,0,0,65536,0,0
18,180000,10000,0,0,256,39,15,4096,2969,0,0,1139,65536,0,0,65536,0,0
19,190000,10000,0,0,256,39,16,4096,3224,0,0,1234,65536,0,1,65536,0,0
20,200000,10000,0,0,256,41,17,4096,3480,0,0,1328,65536,0,1,65536,0,0
21,210000,10000,0,0,256,41,17,4096,3736,0,0,1428,65536,0,1,65536,0,0
22,220000,10000,0,0,256,41,18,4096,3992,0,0,1523,65536,0,1,65536,0,0
23,230000,10000,0,0,256,41,19,4096,4096,0,0,1618,65536,0,1,65536,0,0
24,240000,10000,0,0,256,41,20,4096,4096,0,0,1712,65536,0,1,65536,0,0
25,250000,10000,0,0,256,43,20,2048,2048,0,0,1806,65536,0,1,65536,0,0
26,260000,10000,0,0,256,45,21,2048,2048,0,0,1899,65536,0,1,65536,0,0
27,270000,10000,0,0,256,45,22,1024,1024,0,0,1994,65536,0,1,65536,0,0
28,280000,10000,0,0,256,45,23,1024,1024,0,0,2088,65536,0,1,65536,0,0
29,290000,10000,0,0,256,45,24,512,512,0,0,2180,65536,0,1,65536,0,0
30,300000,10000,0,0,256,45,24,512,512,0,0,2278,65536,0,1,65536,0,0
31,310000,10000,0,0,256,45,25,256,256,0,0,2379,65536,0,1,65536,0,0
32,320000,10000,0,0,255,45,26,256,256,0,0,2474,65536,0,1,65536,0,0
33,330000,10000,0,0,256,45,27,256,256,0,0,2567,65536,0,1,65536,0,0
34,340000,10000,0,0,256,45,27,256,256,0,0,2660,65536,0,1,65536,0,0
35,350000,10000,0,0,256,45,28,256,256,0,0,2756,65536,0,1,65536,0,0
36,360000,10000,0,0,256,45,29,256,256,0,0,2850,65536,0,1,65536,0,0
1 tick_number elapsed_ns tick_interval_ns cache_hits_delta bucket_hits_delta word_executions_delta hot_word_count avg_word_heat_q48 window_width actual_window_size predicted_label_hits jitter_bits apic_ticks time_trust_q48 variance_q48 vm_call_depth_max hera_heat_q48 hermes_heat_q48 artemis_heat_q48
75 1 10000 18446744073708831616 0 0 117 4 4 4096 0 0 4895412794951728796 13 65536 0 0 65536 0 0
76 2 20000 10000 0 0 78 10 7 4096 0 0 0 17 65536 0 0 65536 0 0
77 3 30000 10000 0 0 101 13 7 4096 0 0 0 21 65536 0 0 65536 0 0
78 4 40000 10000 0 0 63 19 8 4096 0 0 0 24 25 65536 0 0 65536 0 0
79 5 50000 10000 0 0 92 25 8 4096 2 0 0 30 31 65536 0 0 65536 0 0
80 6 60000 10000 0 0 64 27 8 4096 2 0 0 34 36 65536 0 0 65536 0 0
81 7 70000 10000 0 0 228 32 8 4096 210 0 0 113 115 65536 0 0 65536 0 0
82 8 80000 10000 0 0 256 34 9 4096 466 0 0 206 215 65536 0 0 65536 0 0
83 9 90000 10000 0 0 256 36 10 4096 722 0 0 304 310 65536 0 0 65536 0 0
84 10 100000 10000 0 0 256 36 11 4096 978 0 0 403 65536 0 0 65536 0 0
85 11 110000 10000 0 0 256 36 11 4096 1234 0 0 502 497 65536 0 0 65536 0 0
86 12 120000 10000 0 0 256 36 12 4096 1490 0 0 594 591 65536 0 0 65536 0 0
87 13 130000 10000 0 0 256 37 12 4096 1746 0 0 690 685 65536 0 0 65536 0 0
88 14 140000 10000 0 0 230 39 12 4096 1949 0 0 766 762 65536 0 0 65536 0 0
89 15 150000 10000 0 0 256 39 13 4096 2204 0 0 858 856 65536 0 0 65536 0 0
90 16 160000 10000 0 0 256 39 14 4096 2459 0 0 950 65536 0 0 65536 0 0
91 17 170000 10000 0 0 256 39 15 4096 2713 0 0 1042 1045 65536 0 0 65536 0 0
92 18 180000 10000 0 0 256 39 15 4096 2969 0 0 1135 1139 65536 0 0 65536 0 0
93 19 190000 10000 0 0 256 39 16 4096 3224 0 0 1228 1234 65536 0 1 65536 0 0
94 20 200000 10000 0 0 256 41 17 4096 3480 0 0 1320 1328 65536 0 1 65536 0 0
95 21 210000 10000 0 0 256 41 17 4096 3736 0 0 1412 1428 65536 0 1 65536 0 0
96 22 220000 10000 0 0 256 41 18 4096 3992 0 0 1504 1523 65536 0 1 65536 0 0
97 23 230000 10000 0 0 256 41 19 4096 4096 0 0 1598 1618 65536 0 1 65536 0 0
98 24 240000 10000 0 0 256 41 20 4096 4096 0 0 1694 1712 65536 0 1 65536 0 0
99 25 250000 10000 0 0 256 43 20 2048 2048 0 0 1788 1806 65536 0 1 65536 0 0
100 26 260000 10000 0 0 256 45 21 2048 2048 0 0 1881 1899 65536 0 1 65536 0 0
101 27 270000 10000 0 0 256 45 22 1024 1024 0 0 1978 1994 65536 0 1 65536 0 0
102 28 280000 10000 0 0 256 45 23 1024 1024 0 0 2071 2088 65536 0 1 65536 0 0
103 29 290000 10000 0 0 256 45 24 512 512 0 0 2164 2180 65536 0 1 65536 0 0
104 30 300000 10000 0 0 256 45 24 512 512 0 0 2259 2278 65536 0 1 65536 0 0
105 31 310000 10000 0 0 256 45 25 256 256 0 0 2351 2379 65536 0 1 65536 0 0
106 32 320000 10000 0 0 255 45 26 256 256 0 0 2443 2474 65536 0 1 65536 0 0
107 33 330000 10000 0 0 256 45 27 256 256 0 0 2536 2567 65536 0 1 65536 0 0
108 34 340000 10000 0 0 256 45 27 256 256 0 0 2632 2660 65536 0 1 65536 0 0
109 35 350000 10000 0 0 256 45 28 256 256 0 0 2726 2756 65536 0 1 65536 0 0
110 36 360000 10000 0 0 256 45 29 256 256 0 0 2818 2850 65536 0 1 65536 0 0