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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
70 lines
4.1 KiB
C
70 lines
4.1 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/dce.h"
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#include "libc/vga/vga.internal.h"
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#include "libc/runtime/pc.internal.h"
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#include "libc/str/str.h"
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struct Tty _vga_tty;
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void _vga_reinit(struct Tty *tty, unsigned short starty, unsigned short startx,
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unsigned init_flags) {
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struct mman *mm = (struct mman *)(BANE + 0x0500);
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unsigned char vid_type = mm->pc_video_type;
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unsigned short height = mm->pc_video_height, width = mm->pc_video_width,
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stride = mm->pc_video_stride;
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uint64_t vid_buf_phy = mm->pc_video_framebuffer;
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void *vid_buf = (void *)(BANE + vid_buf_phy);
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size_t vid_buf_sz = mm->pc_video_framebuffer_size;
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uint8_t chr_ht, chr_wid;
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if (vid_type == PC_VIDEO_TEXT) {
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unsigned short chr_ht_val = mm->pc_video_char_height;
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if (chr_ht_val > 32 || chr_ht_val < 2)
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chr_ht = VGA_ASSUME_CHAR_HEIGHT_PX;
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else
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chr_ht = chr_ht_val;
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} else
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chr_ht = VGA_ASSUME_CHAR_HEIGHT_PX;
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chr_wid = VGA_ASSUME_CHAR_WIDTH_PX;
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/* Make sure the video buffer is mapped into virtual memory. */
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__invert_memory_area(mm, __get_pml4t(), vid_buf_phy, vid_buf_sz, PAGE_RW);
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/*
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* Initialize our tty structure from the current screen geometry, screen
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* contents, cursor position, & character dimensions.
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*/
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_StartTty(tty, vid_type, height, width, stride, starty, startx,
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chr_ht, chr_wid, vid_buf, init_flags);
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}
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__attribute__((__constructor__)) static textstartup void _vga_init(void) {
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if (IsMetal()) {
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struct mman *mm = (struct mman *)(BANE + 0x0500);
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unsigned short starty = mm->pc_video_curs_info.y,
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startx = mm->pc_video_curs_info.x;
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_vga_reinit(&_vga_tty, starty, startx, 0);
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}
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}
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