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1595 palkovsky 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <mm/frame.h>
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#include <sysinfo/sysinfo.h>
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#include <console/klog.h>
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#include <print.h>
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#include <ipc/irq.h>
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/* Order of frame to be allocated for klog communication */
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#define KLOG_ORDER 0
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static char *klog;
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static int klogsize;
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static int klogpos;
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SPINLOCK_INITIALIZE(klog_lock);
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/** Initialize kernel loggin facility
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 *
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 * Allocate pages that are to be shared if uspace for console data
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 */
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void klog_init(void)
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{
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	void *faddr;
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	faddr = (void *)PFN2ADDR(frame_alloc(KLOG_ORDER, FRAME_ATOMIC));
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	if (!faddr)
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		panic("Cannot allocate page for klog");
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	klog = (char *)PA2KA(faddr);
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	sysinfo_set_item_val("klog.faddr", NULL, (__native)faddr);
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	sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER);
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	klogsize = PAGE_SIZE << KLOG_ORDER;
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	klogpos = 0;
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}
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static void klog_vprintf(const char *fmt, va_list args)
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{
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	int ret;
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	va_list atst;
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	va_copy(atst, args);
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	spinlock_lock(&klog_lock);
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	ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
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	// Workaround around bad return value from vsnprintf
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	if (ret+klogpos < klogsize)
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		ret = 100;
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	if (ret == klogsize-klogpos) {
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		klogpos = 0;
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		ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, args);
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		ret = 100;
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		if (ret == klogsize)
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			goto out;
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	}
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	ipc_irq_send_msg(IPC_IRQ_KLOG, klogpos, ret);
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	klogpos += ret;
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	if (klogpos >= klogsize)
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		klogpos = 0;
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out:
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	spinlock_unlock(&klog_lock);
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	va_end(atst);
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}
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/** Printf a message to kernel-uspace log */
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void klog_printf(const char *fmt, ...)
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{
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	va_list args;
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	va_start(args, fmt);
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	klog_vprintf(fmt, args);
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	va_end(args);
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}