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subhobhai943andClaude Opus 5
ba06264d12
Boot logo (init/bootlogo.c, init/logo_data.c, scripts/mklogo.py): The logo appears in two forms because the framebuffer does not exist for the first third of boot. An ASCII rendition goes to the text console and serial line from the first moments; once the video driver is up at step [5/14] the real bitmap takes over as a graphical splash with a progress bar tied to the actual boot stages. The asset is 4-bit palette indexed, so 160x160 pixels cost 12.5 KB instead of 100 KB, and carries a transparency mask so the mark composites onto the gradient rather than stamping a flat rectangle over it. scripts/mklogo.py regenerates init/logo_data.c from the source PNG. Boot reaches the desktop in well under a second, so the splash is held for a minimum duration and the bar sweeps to 100% during the hold; without that the logo would flash past unseen. `splashtime=<ms>` tunes it and `nosplash`, `nogui` or `text` skip it. Bootloader (boot/stage2.asm): stage2 staged the whole kernel in conventional RAM before copying it to 1 MB, which capped the kernel at roughly 576 KB before the load ran into video memory at 0xA0000. The logo pushed it over that line and the kernel stopped booting. Each 32 KB chunk now goes into one fixed low buffer and is copied straight to its final address, using unreal mode for the 32-bit reach. The ceiling is now the image itself, 1.375 MB. Console font (lib/font8x8.c): fb_draw_char was a stub that ignored its character argument and drew a filled rectangle, which is why the splash rendered its text as solid blocks. It now renders real glyphs, and the table it uses is shared: the framebuffer console, the canvas rasterizer and the desktop compositor had three divergent private copies, two of which still carried the `// \` line-continuation defect. printk console sink (kernel/printk.c): printk output can be redirected to a callback, so a caller can run a subsystem that reports via printk and capture what it printed. Serial and the dmesg ring still see everything, which keeps a captured run debuggable. Shell builtins (userland/lazybox/shell.c): The builtin chain is extracted into shell_execute_builtin(), so the kernel TTY and the desktop terminal accept the same vocabulary instead of the GUI seeing only the applet table. Callers that cannot be suspended pass allow_blocking = false to refuse the animating ones. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01L5yKJT4Wo2cV3rfPrwY5MP
50 lines
2.0 KiB
C
50 lines
2.0 KiB
C
#ifndef _INIT_BOOTLOGO_H
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#define _INIT_BOOTLOGO_H
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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// SUB-OS boot logo.
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//
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// The logo appears in two forms because the framebuffer does not exist for the
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// first third of boot. Until the video driver is up, an ASCII rendition goes to
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// the text console and the serial line; once fb_init() and bochs_vbe_init()
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// have run, the real bitmap takes over as a graphical splash with a progress
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// bar, and the remaining boot log continues on serial only.
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//
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// Both forms are generated from the same artwork by scripts/mklogo.py.
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// --- Generated asset (init/logo_data.c) ------------------------------------
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extern const int boot_logo_width;
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extern const int boot_logo_height;
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extern const uint32_t boot_logo_palette[16];
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// Bit N set means palette entry N is background and should not be drawn.
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extern const uint16_t boot_logo_transparent_mask;
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extern const uint8_t boot_logo_bitmap[];
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extern const char* const boot_logo_ascii[];
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// --- Text console ----------------------------------------------------------
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// Draw the ASCII logo and version banner. Safe to call before any driver
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// beyond printk is initialised.
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void boot_logo_print_text(void);
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// --- Graphical splash ------------------------------------------------------
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// Take over the framebuffer. Returns false when no framebuffer is available,
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// in which case the caller should keep logging to the text console.
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bool boot_logo_splash_begin(void);
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// Update the splash. `percent` is clamped to 0..100; `status` may be NULL.
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void boot_logo_splash_progress(int percent, const char* status);
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// Release the splash so the desktop (or the TTY) can own the screen again.
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void boot_logo_splash_end(void);
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bool boot_logo_splash_active(void);
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// Draw the logo at an arbitrary position and integer scale, for callers that
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// want the mark without the splash chrome (the desktop About box, say).
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void boot_logo_draw(int x, int y, int scale);
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#endif // _INIT_BOOTLOGO_H
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