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https://github.com/jart/cosmopolitan.git
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d3efa47f81
* [metal] Refactoring: separate out sys_writev_vga() and _vga_init() modules * [metal] Read VGA info from BDA before long mode entry, not after If using a pre-existing VGA text console, the VGA initialization code now retrieves the cursor position & character height from the BIOS data area while still in real mode — rather than reading from the BIOS data area only after entering long mode. (This should help make the code more correct, if Cosmopolitan were to support UEFI graphics output in the future. If the program were booted via UEFI, then the long mode IsMetal() code would still be activated, but the BIOS data area might not have been initialized in that case.) This change also means that there are now a few more fields in the `struct mman`. * [metal] VGA console can now show "screen of death" upon a crash There is now a new function _klog_vga(), which can be called by kprintf() to output system messages — e.g. information about CPU exceptions — on the VGA screen. * [metal] CPU exception handler now dumps cr2 value * [metal] Add demo of program crash reporting w/ bare metal VGA TTY * [metal] Reduce size of "screen of death" code
97 lines
4.5 KiB
C
97 lines
4.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/newbie.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/mman.internal.h"
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#include "libc/str/str.h"
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#include "libc/vga/vga.internal.h"
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/*
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* @fileoverview Instantiation of routines for emergency or system console
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* output in graphical video modes.
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*
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* @see libc/vga/tty-graph.inc
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*/
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#pragma GCC optimize("s")
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#define KLOGTTY
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#define MAYUNROLLLOOPS /* do not unroll loops; keep the code small! */
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/* Instantiate output routines for 16-bit pixel formats. */
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#define COLOR uint16_t
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#define BPP 16
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#define MAPCOLOR TtyKlog16MapColor
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#define DIRTY TtyKlog16Dirty
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#define UPDATE _TtyKlog16Update
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#define RESETDIRTY TtyKlog16ResetDirty
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#define DRAWBITMAP TtyKlog16DrawBitmap
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#define FILLRECT TtyKlog16FillRect
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#define MOVERECT TtyKlog16MoveRect
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#define DRAWCHAR _TtyKlog16DrawChar
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#define ERASELINECELLS _TtyKlog16EraseLineCells
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#define MOVELINECELLS _TtyKlog16MoveLineCells
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#include "libc/vga/tty-graph.inc"
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#undef COLOR
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#undef BPP
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#undef MAPCOLOR
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#undef BG
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#undef DIRTY
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#undef UPDATE
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#undef RESETDIRTY
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#undef DRAWBITMAP
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#undef FILLRECT
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#undef MOVERECT
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#undef DRAWCHAR
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#undef ERASELINECELLS
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#undef MOVELINECELLS
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/* Instantiate output routines for 32-bit pixel formats. */
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#define COLOR uint32_t
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#define BPP 32
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#define MAPCOLOR TtyKlog32MapColor
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#define DIRTY TtyKlog32Dirty
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#define UPDATE _TtyKlog32Update
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#define RESETDIRTY TtyKlog32ResetDirty
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#define DRAWBITMAP TtyKlog32DrawBitmap
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#define FILLRECT TtyKlog32FillRect
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#define MOVERECT TtyKlog32MoveRect
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#define DRAWCHAR _TtyKlog32DrawChar
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#define ERASELINECELLS _TtyKlog32EraseLineCells
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#define MOVELINECELLS _TtyKlog32MoveLineCells
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#include "libc/vga/tty-graph.inc"
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static unsigned short klog_y = 0, klog_x = 0;
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privileged void _klog_vga(const char *b, size_t n) {
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struct Tty tty;
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_vga_reinit(&tty, klog_y, klog_x, kTtyKlog);
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_TtyWrite(&tty, b, n);
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klog_y = _TtyGetY(&tty);
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klog_x = _TtyGetX(&tty);
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}
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