cosmopolitan/libc/vga/vga-init.greg.c

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/
#include "libc/dce.h"
#include "libc/intrin/kprintf.h"
#include "libc/mem/alloca.h"
#include "libc/runtime/pc.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/str/str.h"
#include "libc/vga/vga.internal.h"
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#ifdef __x86_64__
struct Tty _vga_tty;
void _vga_reinit(struct Tty *tty, unsigned short starty, unsigned short startx,
unsigned init_flags) {
struct mman *mm = __get_mm();
unsigned char vid_type = mm->pc_video_type;
unsigned short height = mm->pc_video_height, width = mm->pc_video_width,
stride = mm->pc_video_stride;
uint64_t vid_buf_phy = mm->pc_video_framebuffer;
void *vid_buf = (void *)(BANE + vid_buf_phy);
size_t vid_buf_sz = mm->pc_video_framebuffer_size;
uint8_t chr_ht, chr_wid;
if (vid_type == PC_VIDEO_TEXT) {
unsigned short chr_ht_val = mm->pc_video_char_height;
if (chr_ht_val > 32 || chr_ht_val < 2)
chr_ht = VGA_ASSUME_CHAR_HEIGHT_PX;
else
chr_ht = chr_ht_val;
} else
chr_ht = VGA_ASSUME_CHAR_HEIGHT_PX;
chr_wid = VGA_ASSUME_CHAR_WIDTH_PX;
/* Make sure the video buffer is mapped into virtual memory. */
__invert_and_perm_ref_memory_area(mm, __get_pml4t(), vid_buf_phy, vid_buf_sz,
PAGE_RW | PAGE_XD);
/*
* Initialize our tty structure from the current screen geometry, screen
* contents, cursor position, & character dimensions.
*/
_StartTty(tty, vid_type, height, width, stride, starty, startx, chr_ht,
chr_wid, vid_buf, init_flags);
}
textstartup void _vga_init(void) {
if (IsMetal()) {
struct mman *mm = __get_mm();
unsigned short starty = mm->pc_video_curs_info.y,
startx = mm->pc_video_curs_info.x;
_vga_reinit(&_vga_tty, starty, startx, 0);
}
}
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#if !IsTiny()
/**
* Non-emergency console vprintf(), useful for dumping debugging or
* informational messages at program startup.
*
* @see uprintf()
*/
void uvprintf(const char *fmt, va_list v) {
if (!IsMetal()) {
kvprintf(fmt, v);
} else {
long size = __get_safe_size(8000, 3000);
char *buf = alloca(size);
CheckLargeStackAllocation(buf, size);
size_t count = kvsnprintf(buf, size, fmt, v);
if (count >= size)
count = size - 1;
_TtyWrite(&_vga_tty, buf, count);
_klog_serial(buf, count);
}
}
/**
* Non-emergency console printf(), useful for dumping debugging or
* informational messages at program startup.
*
* uprintf() is similar to kprintf(), but on bare metal with VGA support, it
* uses the normal, fast graphical console, rather than initializing an
* emergency console. This makes uprintf() faster on bare metal at the
* expense of being less crash-proof.
*
* (The uprintf() function name comes from the FreeBSD kernel.)
*
* @see kprintf()
* @see https://man.freebsd.org/cgi/man.cgi?query=uprintf&sektion=9&n=1
*/
void uprintf(const char *fmt, ...) {
va_list v;
va_start(v, fmt);
uvprintf(fmt, v);
va_end(v);
}
#endif /* !IsTiny() */
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#endif /* __x86_64__ */