e04ca28812
Removes the "-unix" element and with it any trademark exposure to The
Open Group.
The split follows the ecosystem layout: SchOS is the system, and the
kernel has its own name. Kernel-identity strings are the only places
that take SchIFT -- uname(2) sysname, /proc/version, and the two licence
sentences that say "kernel" outright. That is what every Unix does here:
`uname -s` on Linux reports the kernel, not the distribution. Everything
a user reads as the product -- panic screen, boot menu, error prefixes,
docs, LICENSE, NOTICE -- is SchOS.
schunix.img is schos.img, the logo assets and the musl TLS patch are
renamed, and __SCHUNIX__ is __SCHOS__ (the define and the patch that
consumes it moved together).
Two things the rename broke, both found by the bootcheck suite:
- shmtest wrote "SCHUNIX-MMAP-OK" with a hardcoded length of 15 and
compared it back by hand-counted offsets (m[3]=='U', m[14]=='K').
The shorter marker left the write running two bytes past the literal
and the compare reading past the data, failing a file-backed mmap
that was working correctly. Now written and compared through one
constant with sizeof.
- bootcheck asserted a 31-byte file after appending to
"hello-from-schunix"; the shorter string makes it 29.
Both are the same mistake: a string literal whose length is written out
somewhere else. Full suite green -- base, Tty, Ps, Sock, Fb, Usb, Evdev.
95 lines
3.6 KiB
C
95 lines
3.6 KiB
C
#pragma once
|
|
|
|
// Framebuffer device ABI -- /dev/fb0.
|
|
//
|
|
// These are Linux's fbdev request numbers and structure layouts, not ours.
|
|
// SchOS invented this device, so nothing forced the choice; matching Linux
|
|
// was still the right one. A framebuffer is the first thing a graphics
|
|
// program looks for, and every such program already knows how to ask
|
|
// FBIOGET_VSCREENINFO. Inventing a private struct would have meant patching
|
|
// each one we ever port, and -- worse -- a Linux-ABI binary calling
|
|
// FBIOGET_VSCREENINFO would have gotten a *differently shaped* answer to a
|
|
// request it thought it understood, which is the failure mode that made
|
|
// `>>` truncate back when include/fcntl.h held xv6's open flags instead of
|
|
// Linux's. Same lesson, applied before it bites rather than after.
|
|
//
|
|
// Plain C types throughout (no types.h) so userspace can include this
|
|
// directly. Both sides are LP64.
|
|
|
|
#define FBIOGET_VSCREENINFO 0x4600
|
|
#define FBIOPUT_VSCREENINFO 0x4601
|
|
#define FBIOGET_FSCREENINFO 0x4602
|
|
#define FBIOBLANK 0x4611
|
|
|
|
// fb_fix_screeninfo.type
|
|
#define FB_TYPE_PACKED_PIXELS 0
|
|
|
|
// fb_fix_screeninfo.visual
|
|
#define FB_VISUAL_TRUECOLOR 2
|
|
|
|
// fb_var_screeninfo.activate
|
|
#define FB_ACTIVATE_NOW 0
|
|
|
|
// One colour channel's position within a pixel. `offset` is the bit position
|
|
// of the channel's least significant bit; `length` is how many bits it gets.
|
|
// A length of 0 means the channel does not exist -- which is how an opaque
|
|
// framebuffer reports `transp`.
|
|
struct fb_bitfield {
|
|
unsigned int offset;
|
|
unsigned int length;
|
|
unsigned int msb_right; // != 0 means bit 0 is the MSB; never here
|
|
};
|
|
|
|
struct fb_var_screeninfo {
|
|
unsigned int xres; // visible resolution
|
|
unsigned int yres;
|
|
unsigned int xres_virtual; // virtual resolution; == visible, no panning
|
|
unsigned int yres_virtual;
|
|
unsigned int xoffset; // offset of visible area within virtual
|
|
unsigned int yoffset;
|
|
unsigned int bits_per_pixel;
|
|
unsigned int grayscale; // 0 == colour
|
|
struct fb_bitfield red;
|
|
struct fb_bitfield green;
|
|
struct fb_bitfield blue;
|
|
struct fb_bitfield transp;
|
|
unsigned int nonstd; // 0 == standard pixel format
|
|
unsigned int activate;
|
|
unsigned int height; // physical size in mm; 0 == unknown, and
|
|
unsigned int width; // VBE does not tell us, so it stays 0
|
|
unsigned int accel_flags;
|
|
// Timings. The mode is whatever the bootloader's VBE call established and
|
|
// we cannot change it, so these are all reported as zero rather than
|
|
// invented.
|
|
unsigned int pixclock;
|
|
unsigned int left_margin;
|
|
unsigned int right_margin;
|
|
unsigned int upper_margin;
|
|
unsigned int lower_margin;
|
|
unsigned int hsync_len;
|
|
unsigned int vsync_len;
|
|
unsigned int sync;
|
|
unsigned int vmode;
|
|
unsigned int rotate;
|
|
unsigned int colorspace;
|
|
unsigned int reserved[4];
|
|
};
|
|
|
|
struct fb_fix_screeninfo {
|
|
char id[16]; // "schosfb"
|
|
unsigned long smem_start; // physical address of the framebuffer
|
|
unsigned int smem_len; // its length in bytes
|
|
unsigned int type;
|
|
unsigned int type_aux;
|
|
unsigned int visual;
|
|
unsigned short xpanstep; // 0 == panning unsupported
|
|
unsigned short ypanstep;
|
|
unsigned short ywrapstep;
|
|
unsigned int line_length; // bytes per scanline (the VBE stride, which
|
|
// is NOT always xres * bytes_per_pixel)
|
|
unsigned long mmio_start; // no separate register aperture
|
|
unsigned int mmio_len;
|
|
unsigned int accel; // no acceleration
|
|
unsigned short capabilities;
|
|
unsigned short reserved[2];
|
|
};
|