mirror of
https://github.com/jart/cosmopolitan.git
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76 lines
4.2 KiB
C
76 lines
4.2 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/runtime/pc.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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#ifdef __x86_64__
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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,
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PAGE_RW | PAGE_XD);
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__ref_pages(mm, __get_pml4t(), vid_buf_phy, vid_buf_sz);
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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, chr_ht,
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chr_wid, vid_buf, init_flags);
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}
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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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#endif /* __x86_64__ */
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