a1c965da1e
Sixty-five headers sat side by side in include/, so `#include "irq.h"` said nothing about where irq.h was or what it belonged to, and errno.h, stat.h and fcntl.h at the top shadowed the system's for any host tool built with -I./include. They are in folders now -- arch/ core/ fs/ dev/ gfx/ net/ uapi/ (and ldls/ for the Linux driver layer) -- and every include names the folder, as Linux's do: "core/proc.h". Done mechanically and checked the hard way: the kernel built from this tree disassembles identically to the one built from the tree before it. The full image boots, and userland is the same set of programs. Paths in docs and comments follow; docs/guides/layout.md has a table of what is where, and tools/fix-includes.py rewrites old-style includes from the folders in the tree, for code written before this. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
95 lines
3.6 KiB
C
95 lines
3.6 KiB
C
#pragma once
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// Framebuffer device ABI -- /dev/fb0.
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//
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// These are Linux's fbdev request numbers and structure layouts, not ours.
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// SchOS invented this device, so nothing forced the choice; matching Linux
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// was still the right one. A framebuffer is the first thing a graphics
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// program looks for, and every such program already knows how to ask
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// FBIOGET_VSCREENINFO. Inventing a private struct would have meant patching
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// each one we ever port, and -- worse -- a Linux-ABI binary calling
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// FBIOGET_VSCREENINFO would have gotten a *differently shaped* answer to a
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// request it thought it understood, which is the failure mode that made
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// `>>` truncate back when include/uapi/fcntl.h held xv6's open flags instead of
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// Linux's. Same lesson, applied before it bites rather than after.
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//
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// Plain C types throughout (no types.h) so userspace can include this
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// directly. Both sides are LP64.
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#define FBIOGET_VSCREENINFO 0x4600
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#define FBIOPUT_VSCREENINFO 0x4601
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#define FBIOGET_FSCREENINFO 0x4602
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#define FBIOBLANK 0x4611
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// fb_fix_screeninfo.type
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#define FB_TYPE_PACKED_PIXELS 0
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// fb_fix_screeninfo.visual
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#define FB_VISUAL_TRUECOLOR 2
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// fb_var_screeninfo.activate
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#define FB_ACTIVATE_NOW 0
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// One colour channel's position within a pixel. `offset` is the bit position
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// of the channel's least significant bit; `length` is how many bits it gets.
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// A length of 0 means the channel does not exist -- which is how an opaque
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// framebuffer reports `transp`.
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struct fb_bitfield {
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unsigned int offset;
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unsigned int length;
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unsigned int msb_right; // != 0 means bit 0 is the MSB; never here
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};
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struct fb_var_screeninfo {
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unsigned int xres; // visible resolution
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unsigned int yres;
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unsigned int xres_virtual; // virtual resolution; == visible, no panning
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unsigned int yres_virtual;
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unsigned int xoffset; // offset of visible area within virtual
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unsigned int yoffset;
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unsigned int bits_per_pixel;
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unsigned int grayscale; // 0 == colour
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struct fb_bitfield red;
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struct fb_bitfield green;
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struct fb_bitfield blue;
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struct fb_bitfield transp;
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unsigned int nonstd; // 0 == standard pixel format
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unsigned int activate;
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unsigned int height; // physical size in mm; 0 == unknown, and
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unsigned int width; // VBE does not tell us, so it stays 0
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unsigned int accel_flags;
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// Timings. The mode is whatever the bootloader's VBE call established and
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// we cannot change it, so these are all reported as zero rather than
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// invented.
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unsigned int pixclock;
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unsigned int left_margin;
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unsigned int right_margin;
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unsigned int upper_margin;
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unsigned int lower_margin;
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unsigned int hsync_len;
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unsigned int vsync_len;
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unsigned int sync;
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unsigned int vmode;
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unsigned int rotate;
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unsigned int colorspace;
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unsigned int reserved[4];
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};
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struct fb_fix_screeninfo {
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char id[16]; // "schosfb"
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unsigned long smem_start; // physical address of the framebuffer
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unsigned int smem_len; // its length in bytes
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unsigned int type;
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unsigned int type_aux;
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unsigned int visual;
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unsigned short xpanstep; // 0 == panning unsupported
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unsigned short ypanstep;
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unsigned short ywrapstep;
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unsigned int line_length; // bytes per scanline (the VBE stride, which
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// is NOT always xres * bytes_per_pixel)
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unsigned long mmio_start; // no separate register aperture
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unsigned int mmio_len;
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unsigned int accel; // no acceleration
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unsigned short capabilities;
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unsigned short reserved[2];
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};
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