57 lines
2.6 KiB
C
57 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "ape/lib/pc.h"
|
|
#include "libc/nexgen32e/uart.h"
|
|
#include "libc/stdio/internal.h"
|
|
#include "libc/stdio/stdio.h"
|
|
|
|
static void fin(FILE *f) {
|
|
f->buf[f->end] = inb(0x3F8);
|
|
f->end = (f->end + 1) & (f->size - 1);
|
|
}
|
|
|
|
static void fout(FILE *f) {
|
|
outb(0x3F8, f->buf[f->beg]);
|
|
f->beg = (f->beg + 1) & (f->size - 1);
|
|
}
|
|
|
|
static int serialstdio(FILE *f, unsigned char status, void action(FILE *)) {
|
|
int block = 1;
|
|
unsigned tally = 0;
|
|
while (f->end != f->beg) {
|
|
if (!(inb(0x3F8 + UART_LSR) & status)) {
|
|
if (!block) break;
|
|
asm("pause");
|
|
} else {
|
|
action(f);
|
|
tally++;
|
|
}
|
|
}
|
|
return (int)tally;
|
|
}
|
|
|
|
int fsreadbuf(FILE *f) {
|
|
return serialstdio(f, UART_TTYDA, fin);
|
|
}
|
|
|
|
int fswritebuf(FILE *f) {
|
|
return serialstdio(f, UART_TTYTXR, fout);
|
|
}
|