feat(gui): 内核双缓冲 present 管线与 FbPageSet 显存页登记#7
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Rebuild on origin/master: substantive changes only, preserve master CRLF for legacy files, stage .gitattributes last. Add page_table::remap and export FB_USER_VADDR. Co-authored-by: Cursor <cursoragent@cursor.com>
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gpu.rs polls virtqueues via H::cpu_relax(); expose a default spin_loop on Hal and re-export Rect for os GPU flush_rect clamping. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
flush_rect/present/wait_fence；dirty bbox 合并；可选 ping-pong remap[fb_seg]日志0x06a00000与 FB0x10000000分离GET_TIME_RAW/GET_CYCLE）RefCell already borrowedpanicpresent_dirty去掉多余wait_fence（present 已同步完成）Test plan
./scripts/docker-mindos.sh build./scripts/docker-mindos.sh test-gui-allMINDOS_FB_PING_PONG=1 ./scripts/docker-mindos.sh build+run-gui→gui_tetris./scripts/test-gui-pingpong.sh