mirror of
https://github.com/jart/cosmopolitan.git
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84 lines
3.3 KiB
C
84 lines
3.3 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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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/nexgen32e/uart.internal.h"
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#include "libc/runtime/pc.internal.h"
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#include "libc/runtime/runtime.h"
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#ifdef __x86_64__
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#define PUTC(C) \
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do { \
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while (!(inb(0x3F8 + UART_LSR) & UART_TTYTXR)) { \
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__builtin_ia32_pause(); \
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} \
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outb(0x3F8, C); \
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} while (0)
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/**
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* Prints string to serial port.
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*
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* This only supports %d and %s. It'll will work even if .rodata hasn't
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* been loaded into memory yet.
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*/
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textreal void(MetalPrintf)(const char *fmt, ...) {
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int i;
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char c;
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unsigned u;
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va_list va;
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const char *s;
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unsigned long d;
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va_start(va, fmt);
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for (;;) {
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switch ((c = *fmt++)) {
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case '\0':
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va_end(va);
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return;
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case '%':
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switch ((c = *fmt++)) {
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case 's':
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for (s = va_arg(va, const char *); s && *s; ++s) {
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PUTC(*s);
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}
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break;
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case 'd':
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d = va_arg(va, unsigned long);
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for (i = 16; i--;) {
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u = (d >> (i * 4)) & 0xf;
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if (u < 10) {
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c = '0' + u;
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} else {
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u -= 10;
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c = 'a' + u;
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}
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PUTC(c);
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}
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break;
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default:
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PUTC(c);
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break;
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}
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break;
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default:
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PUTC(c);
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break;
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}
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}
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}
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#endif /* __x86_64__ */
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