55 lines
986 B
C
55 lines
986 B
C
/**
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* \file
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* \brief The world's simplest serial driver.
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*
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*/
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/*
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* Copyright (c) 2010, ETH Zurich.
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* All rights reserved.
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*
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* This file is distributed under the terms in the attached LICENSE file.
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* If you do not find this file, copies can be found by writing to:
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* ETH Zurich D-INFK, Universitaetstrasse 6, CH-8092 Zurich. Attn: Systems Group.
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*/
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#include <serial.h>
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#include <kputchar.h>
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#include <global.h>
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#include <barrelfish_kpi/spinlocks_arch.h>
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#define KPBUFSZ 256
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static char kputbuf[KPBUFSZ];
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static int kcount = 0;
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static void kflush(void)
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{
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for(int i=0; i<kcount; i++) {
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serial_console_putchar(kputbuf[i]);
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}
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kcount = 0;
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}
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void kprintf_begin(void)
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{
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acquire_spinlock(&global->locks.print);
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kcount = 0;
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}
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int kputchar(int c)
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{
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kputbuf[kcount++] = c;
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if (kcount == KPBUFSZ || c == '\n') {
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kflush();
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}
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return c;
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}
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void kprintf_end(void)
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{
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kflush();
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release_spinlock(&global->locks.print);
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}
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// End
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